├── .gitignore ├── .idea ├── .gitignore ├── compiler.xml ├── gradle.xml ├── jarRepositories.xml ├── misc.xml └── vcs.xml ├── LICENSE ├── README.md ├── README_EN.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── funny │ │ └── compose │ │ └── physicslayout │ │ └── ExampleInstrumentedTest.kt │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ └── com │ │ │ └── funny │ │ │ └── compose │ │ │ └── physicslayout │ │ │ ├── MainActivity.kt │ │ │ └── ui │ │ │ ├── RandomColorBox.kt │ │ │ └── theme │ │ │ ├── Color.kt │ │ │ ├── Shape.kt │ │ │ ├── Theme.kt │ │ │ └── Type.kt │ └── res │ │ ├── drawable-v24 │ │ └── ic_launcher_foreground.xml │ │ ├── drawable │ │ ├── bg_avatar.jpg │ │ └── ic_launcher_background.xml │ │ ├── mipmap-anydpi-v26 │ │ ├── ic_launcher.xml │ │ └── ic_launcher_round.xml │ │ ├── mipmap-hdpi │ │ ├── ic_launcher.webp │ │ └── ic_launcher_round.webp │ │ ├── mipmap-mdpi │ │ ├── ic_launcher.webp │ │ └── ic_launcher_round.webp │ │ ├── mipmap-xhdpi │ │ ├── ic_launcher.webp │ │ └── ic_launcher_round.webp │ │ ├── mipmap-xxhdpi │ │ ├── ic_launcher.webp │ │ └── ic_launcher_round.webp │ │ ├── mipmap-xxxhdpi │ │ ├── ic_launcher.webp │ │ └── ic_launcher_round.webp │ │ ├── values │ │ ├── colors.xml │ │ ├── strings.xml │ │ └── themes.xml │ │ └── xml │ │ ├── backup_rules.xml │ │ └── data_extraction_rules.xml │ └── test │ └── java │ └── com │ └── funny │ └── compose │ └── physicslayout │ └── ExampleUnitTest.kt ├── build.gradle ├── demo.apk ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── jitpack.yml ├── physics ├── .gitignore ├── build.gradle ├── consumer-rules.pro ├── proguard-rules.pro ├── repos │ └── releases │ │ └── com │ │ └── funny │ │ └── compose │ │ └── physics-layout │ │ ├── 1.0.0 │ │ ├── physics-layout-1.0.0.aar │ │ ├── physics-layout-1.0.0.aar.md5 │ │ ├── physics-layout-1.0.0.aar.sha1 │ │ ├── physics-layout-1.0.0.aar.sha256 │ │ ├── physics-layout-1.0.0.aar.sha512 │ │ ├── physics-layout-1.0.0.module │ │ ├── physics-layout-1.0.0.module.md5 │ │ ├── physics-layout-1.0.0.module.sha1 │ │ ├── physics-layout-1.0.0.module.sha256 │ │ ├── physics-layout-1.0.0.module.sha512 │ │ ├── physics-layout-1.0.0.pom │ │ ├── physics-layout-1.0.0.pom.md5 │ │ ├── physics-layout-1.0.0.pom.sha1 │ │ ├── physics-layout-1.0.0.pom.sha256 │ │ └── physics-layout-1.0.0.pom.sha512 │ │ ├── maven-metadata.xml │ │ ├── maven-metadata.xml.md5 │ │ ├── maven-metadata.xml.sha1 │ │ ├── maven-metadata.xml.sha256 │ │ └── maven-metadata.xml.sha512 └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── funny │ │ └── compose │ │ └── physics │ │ └── ExampleInstrumentedTest.kt │ ├── main │ ├── AndroidManifest.xml │ └── java │ │ └── com │ │ └── funny │ │ └── compose │ │ └── physics │ │ ├── Bound.kt │ │ ├── LayoutRecomposeTest.kt │ │ ├── Physics.kt │ │ ├── PhysicsConfig.kt │ │ ├── PhysicsLayout.kt │ │ ├── PhysicsLayoutState.kt │ │ └── PhysicsParentData.kt │ └── test │ └── java │ └── com │ └── funny │ └── compose │ └── physics │ └── ExampleUnitTest.kt ├── screen_shot.gif └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/caches 5 | /.idea/libraries 6 | /.idea/modules.xml 7 | /.idea/workspace.xml 8 | /.idea/navEditor.xml 9 | /.idea/assetWizardSettings.xml 10 | .DS_Store 11 | /build 12 | /captures 13 | .externalNativeBuild 14 | .cxx 15 | local.properties 16 | -------------------------------------------------------------------------------- /.idea/.gitignore: -------------------------------------------------------------------------------- 1 | # Default ignored files 2 | /shelf/ 3 | /workspace.xml 4 | -------------------------------------------------------------------------------- /.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 19 | 20 | -------------------------------------------------------------------------------- /.idea/jarRepositories.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 9 | 10 | 14 | 15 | 19 | 20 | 24 | 25 | 29 | 30 | 34 | 35 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 9 | -------------------------------------------------------------------------------- /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2022 FunnySaltyFish 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## Jetpack Compose 自定义布局+物理引擎 = ？ 2 | [![](https://jitpack.io/v/FunnySaltyFish/JetpackComposePhysicsLayout.svg)](https://jitpack.io/#FunnySaltyFish/JetpackComposePhysicsLayout) 3 | 4 | [English](README_EN.md) 5 | 6 | 本库基于`Compose`自定义布局技术 + `JBox2d` 实现了物理引擎布局。其内部`Composable`会由物理引擎不断运动 7 | 8 | 9 | ### 效果 10 | 11 | 12 | 13 | ![PhysicsLayout演示_](screen_shot.gif) 14 | 15 | 16 | 17 | 所对应代码大致为： 18 | 19 | ```kotlin 20 | val physicsConfig = PhysicsConfig() 21 | 22 | PhysicsLayout(modifier = modifier, physicsLayoutState = physicsLayoutState, boundSize = boundSize.toFloat()) { 23 | RandomColorBox(modifier = Modifier 24 | .size(40.dp) 25 | .physics(physicsConfig, initialX = 300f, initialY = 500f)) 26 | // This one has a circle shape 27 | // so you need to modify it with not only a `clip()` Modifier to make it "looks like" a circle 28 | // but also a `physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE)` Modifier to create a circle Body 29 | RandomColorBox(modifier = Modifier 30 | .clip(CircleShape) 31 | .size(50.dp) 32 | .physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE), 300f, 1000f)) 33 | RandomColorBox(...) 34 | Checkbox(...) 35 | Card(...) { 36 | ... 37 | } 38 | } 39 | ``` 40 | 41 | 这之中的`PhysicsLayout`就是我实现的`物理布局`了 42 | 43 | 如需体验上图的其他功能，可以在仓库下载[demo](demo.apk) 44 | 45 | 46 | 47 | ### 使用 48 | 49 | 库代码位置位于`physics`模块下，故需先依赖此模块。 50 | ```bash 51 | implementation 'com.github.FunnySaltyFish:JetpackComposePhysicsLayout:Tag' 52 | ``` 53 | 54 | 布局名为`PhysicsLayout`，基本使用如下： 55 | 56 | ```kotlin 57 | val physicsConfig = PhysicsConfig() 58 | @Composable 59 | fun PhysicsLayoutTest(modifier: Modifier) { 60 | // physicsLayoutState 含有物理模拟相关的 physics 类，并提供了两个方法 61 | // setGravity 和 giveRandomImpulse 62 | val physicsLayoutState by remember { 63 | mutableStateOf(PhysicsLayoutState()) 64 | } 65 | var boundSize by remember { 66 | mutableStateOf(20) 67 | } 68 | PhysicsLayout(modifier = modifier, physicsLayoutState = physicsLayoutState, boundSize = boundSize.toFloat()) { 69 | // 使用 .physics Modifier指定物理相关 70 | // initialX/Y 可指定初始位置 71 | RandomColorBox(modifier = Modifier 72 | .size(40.dp) 73 | .physics(physicsConfig, initialX = 300f, initialY = 500f)) 74 | // 如果需要指定为圆形的形状 75 | // 你需要先使用`clip()` Modifier 让它“看起来”是个圆 76 | // 再指定`physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE)` Modifier 77 | // 让它在物理世界中是个圆形 78 | RandomColorBox(modifier = Modifier 79 | .clip(CircleShape) 80 | .size(50.dp) 81 | .physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE), 300f, 1000f)) 82 | } 83 | } 84 | ``` 85 | 86 | 87 | 88 | ### 参考 89 | 90 | 正如标题所言，这是一个自定义布局。关于这方面，我已经写了**5篇文章**详细描述了，感兴趣的同学可以点击我的头像查看。本文所用到的无非就是那里的知识加上`JBox2d`而已，看完之后你也写的出来 91 | 92 | 93 | 94 | #### JBox2d 95 | 96 | > JBox2D是开源的2D物理引擎，能够根据开发人员设定的参数，如重力、密度、摩擦系数和弹性系数等，自动进行2D刚体物理运动的模拟。 97 | 98 | 99 | 100 | #### 参考 101 | 102 | 本布局参考自[Jawnnypoo/PhysicsLayout: Android layout that simulates physics using JBox2D (github.com)](https://github.com/Jawnnypoo/PhysicsLayout)，其中部分代码也来自于那里，在此表示诚挚的感谢！( 不过我进行了大量的修改，以使原先用于 `View`的代码被用于`Compose`） 103 | 104 | 105 | 106 | ### 实现 107 | 108 | #### 定义 109 | 110 | 首先，我们先来想一个事情：现在每个物体其实都有自己的**位置、大小、形状**这些参数，那么**父布局怎么获得这些值**呢？如果你读过我的[深入Jetpack Compose——布局原理与自定义布局（四）ParentData](https://juejin.cn/post/7073307559792214024)，估计可以想到：这是利用`ParentData`传递的。所以咱们先写个自定义的`ParentData`吧 111 | 112 | ```kotlin 113 | class PhysicsParentData( 114 | var physicsConfig: PhysicsConfig = PhysicsConfig(), 115 | var initialX: Float = 0f, 116 | var initialY: Float = 0f, 117 | var width: Int = 0, 118 | var height: Int = 0 119 | ) 120 | ``` 121 | 122 | `PhysicsConfig`代表基本的物理配置，我们先不细究，其余的就是**初位置和宽高了**。 123 | 124 | 125 | 126 | 有了`ParentData`，那是不是也得有对应的修饰符和作用域啊，所以咱们写一写 127 | 128 | ```kotlin 129 | interface PhysicsLayoutScope { 130 | @Stable 131 | fun Modifier.physics(physicsConfig: PhysicsConfig, initialX : Float = 0f, initialY : Float = 0f) : Modifier 132 | } 133 | 134 | internal object PhysicsLayoutScopeInstance : PhysicsLayoutScope { 135 | @Stable 136 | override fun Modifier.physics( 137 | physicsConfig: PhysicsConfig, 138 | initialX: Float, 139 | initialY: Float 140 | ): Modifier = this.then(PhysicsParentData(physicsConfig, initialX, initialY)) 141 | } 142 | ``` 143 | 144 | 上面的代码都很简单，属于是自定义`Modifier`的基本操作了，如果你看不懂可以先了解了解再来 145 | 146 | 147 | 148 | #### 使用 149 | 150 | 现在`Modifier`的定义差不多了，接下来就是使用了。其实总结下来就是这个过程 151 | 152 | 1. 初始化各个物体和世界 153 | 154 | 2. 用代码不断模拟一下各个物体的运动过程 155 | 3. 在Layout过程中获取位置并正确摆放出来 156 | 157 | 咱们分别来看*（下面的内容只是我的思路，有些地方可能不太优雅，如果您有更好的想法欢迎指出！）* 158 | 159 | 整体来说，应该有一些代码专门负责物理模拟的过程，这一部分在代码中为`Physics`类，它负责进行具体的`物理世界创造`、`进行物理模拟`等过程。此处不赘述。 160 | 161 | 162 | 163 | ##### 初始化 164 | 165 | 考虑到各子微件的具体信息要到`Layout`才能读取到，所以似乎只能在这里初始化；但是`Layout`又会反复进行，而初始化应该只进行一次。所以用个变量来控制吧 166 | 167 | ```kotlin 168 | var initialized by remember { 169 | mutableStateOf(false) 170 | } 171 | ``` 172 | 173 | 然后第一次`Layout`时读取各`ParentData`并存起来 174 | 175 | ```kotlin 176 | val placeables = measurables.mapIndexed { index, measurable -> 177 | val physicsParentData = (measurable.parentData as? PhysicsParentData) ?: PhysicsParentData() 178 | if (!initialized){ 179 | parentDataList.add(index, physicsParentData) 180 | } 181 | measurable.measure(childConstraints) 182 | } 183 | ``` 184 | 185 | 然后开个副作用，在所有**物体信息**初始化好后创建世界并创建**Body**（在`JBox2d`中代表`刚体`的类） 186 | 187 | ```kotlin 188 | // 初始化世界 189 | LaunchedEffect(initialized){ 190 | if (!initialized) return@LaunchedEffect 191 | physics.createWorld { body, i -> 192 | parentDataList[i].body = body 193 | } 194 | } 195 | ``` 196 | 197 | 其中`createWord`方法负责创建`Body`并在每个`Body`创建完后回调 198 | 199 | 200 | 201 | ##### 不断模拟 202 | 203 | 模拟的工作交给`JBox2d`，我们要做的就是`不断`就行。所以`while`循环吧 204 | 205 | ```kotlin 206 | LaunchedEffect(key1 = Unit){ 207 | while (true){ 208 | delay(16) 209 | physics.step() // 模拟 16ms 210 | } 211 | } 212 | ``` 213 | 214 | 215 | 216 | ##### 读取并正确放置 217 | 218 | 这个就很简单了，在`Layout`方法里`layout()`中读一下各个`Body`的位置并`place`就行 219 | 220 | 不过这里注意，因为`Body`有旋转角度，所以在`place`的时候需要使用`placeWithLayer`，该方法签名如下： 221 | 222 | ```kotlin 223 | fun Placeable.placeWithLayer( 224 | position: IntOffset, 225 | zIndex: Float = 0f, 226 | layerBlock: GraphicsLayerScope.() -> Unit = DefaultLayerBlock 227 | ) 228 | ``` 229 | 230 | 其中第三个参数`layerBlock`就提供了`缩放、选择`等方法。具体代码是： 231 | 232 | ```kotlin 233 | layout(constraints.maxWidth, constraints.maxHeight){ 234 | placeables.forEachIndexed { i, placeable: Placeable -> 235 | val x = physics.metersToPixels(parentDataList[i].x).toInt() - placeable.width / 2 236 | val y = physics.metersToPixels(parentDataList[i].y).toInt() - placeable.height / 2 237 | 238 | placeable.placeWithLayer(IntOffset(x,y), zIndex = 0f, layerBlock = { 239 | rotationZ = parentDataList[i].rotation 240 | }) 241 | } 242 | } 243 | ``` 244 | 245 | 上面的`metersToPixels`用于将**物理世界的坐标映射到现实** 246 | 247 | 完工！ 248 | 249 | 250 | 251 | ### 后续 252 | 253 | 其实目前来看，代码里还有些地方感觉不大对劲，比如，为了触发`Layout`过程，我实际使用了一个并无任何用处的`state`。因为在我的尝试里，只要`layout`块里不出现`state`的变化，它就不会重新触发（这点当然符合Compose的感觉喽）；我想不到什么好点子，只好这么处理了。如果大家有什么好想法，欢迎探讨和PR 254 | 255 | 如果你好奇有什么用……额，我也不知道有什么实际用处。我就是觉得很好玩儿，很早之前就想做了，最近下定决心，两天完成，感觉效果还不错。 256 | 257 | 如果你对Compose完整项目感兴趣，欢迎看看我的开源项目[FunnySaltyFish/FunnyTranslation: 基于Jetpack Compose开发的翻译软件，支持多引擎、插件化~](https://github.com/FunnySaltyFish/FunnyTranslation) 258 | -------------------------------------------------------------------------------- /README_EN.md: -------------------------------------------------------------------------------- 1 | ## Jetpack Compose Custom Layout + Physical Engine = ? 2 | [![](https://jitpack.io/v/FunnySaltyFish/JetpackComposePhysicsLayout.svg)](https://jitpack.io/#FunnySaltyFish/JetpackComposePhysicsLayout) 3 | 4 | This library is based on Jetpack Compose custom layout + physical engine（JBox2d）. 5 | 6 | Especially thanks to [Jawnnypoo/PhysicsLayout: Android layout that simulates physics using JBox2D (github.com)](https://github.com/Jawnnypoo/PhysicsLayout). 7 | 8 | 9 | 10 | ### Demo 11 | 12 | 13 | 14 | ![PhysicsLayout Demo](screen_shot.gif) 15 | 16 | (These three buttons are "give random impulse", "set random gravity" and "set random border size" ) 17 | 18 | The corresponding codes are roughly as follows: 19 | 20 | 21 | ```kotlin 22 | val physicsConfig = PhysicsConfig() 23 | 24 | PhysicsLayout(modifier = modifier, physicsLayoutState = physicsLayoutState, boundSize = boundSize.toFloat()) { 25 | RandomColorBox(modifier = Modifier 26 | .size(40.dp) 27 | .physics(physicsConfig, initialX = 300f, initialY = 500f)) 28 | // This one has a circle shape 29 | // so you need to modify it with not only a `clip()` Modifier to make it "looks like" a circle 30 | // but also a `physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE)` Modifier to create a circle Body 31 | RandomColorBox(modifier = Modifier 32 | .clip(CircleShape) 33 | .size(50.dp) 34 | .physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE), 300f, 1000f)) 35 | RandomColorBox(...) 36 | Checkbox(...) 37 | Card(...) 38 | } 39 | ``` 40 | 41 | To experience additional features above, you can download the demo [here](demo.apk). 42 | 43 | 44 | 45 | ### Usage 46 | 47 | The code of core library code is located in module `physics`. You can implement by using: 48 | ```bash 49 | implementation 'com.github.FunnySaltyFish:JetpackComposePhysicsLayout:Tag' 50 | ``` 51 | 52 | The basically usage is as follows: 53 | 54 | 55 | ```kotlin 56 | val physicsConfig = PhysicsConfig() 57 | @Composable 58 | fun PhysicsLayoutTest(modifier: Modifier) { 59 | // physicsLayoutState contains the class about physics, providing two methods 60 | // setGravity and giveRandomImpulse 61 | val physicsLayoutState by remember { 62 | mutableStateOf(PhysicsLayoutState()) 63 | } 64 | var boundSize by remember { 65 | mutableStateOf(20) 66 | } 67 | PhysicsLayout(modifier = modifier, physicsLayoutState = physicsLayoutState, boundSize = boundSize.toFloat()) { 68 | // use `Modifier.physics` to specify the config of physics 69 | // initialX/Y is the initial position of the body 70 | RandomColorBox(modifier = Modifier 71 | .size(40.dp) 72 | .physics(physicsConfig, initialX = 300f, initialY = 500f)) 73 | // This one has a circle shape 74 | // so you need to modify it with not only a `clip()` Modifier to make it "looks like" a circle 75 | // but also a `physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE)` Modifier to create a circle Body 76 | RandomColorBox(modifier = Modifier 77 | .clip(CircleShape) 78 | .size(50.dp) 79 | .physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE), 300f, 1000f)) 80 | } 81 | } 82 | ``` 83 | 84 | 85 | 86 | ### Reference 87 | 88 | #### JBox2d 89 | 90 | > JBox2D is an open-source 2D physical engine, which can automatically simulate the physical motion of 2D rigid body according to the parameters set by developers, such as gravity, density, friction coefficient and elastic coefficient. 91 | 92 | 93 | 94 | ### How It Works? 95 | 96 | #### definition 97 | 98 | First, consider one thing: now each object actually has its own **location, size, shape** , so how does **parent layout get these values**? If you've read some related blogs, you can know it: we may use `ParentData`. So let's write a custom `ParentDataModifier` first. 99 | 100 | 101 | ```kotlin 102 | class PhysicsParentData( 103 | var physicsConfig: PhysicsConfig = PhysicsConfig(), 104 | var initialX: Float = 0f, 105 | var initialY: Float = 0f, 106 | var width: Int = 0, 107 | var height: Int = 0 108 | ) : ParentDataModifier 109 | ``` 110 | 111 | `PhysicsConfig` stands for the basic physical configuration, and the rest is the **initial position and the size**. 112 | 113 | 114 | 115 | Well. let's write corresponding scope then. 116 | 117 | 118 | ```kotlin 119 | interface PhysicsLayoutScope { 120 | @Stable 121 | fun Modifier.physics(physicsConfig: PhysicsConfig, initialX : Float = 0f, initialY : Float = 0f) : Modifier 122 | } 123 | 124 | internal object PhysicsLayoutScopeInstance : PhysicsLayoutScope { 125 | @Stable 126 | override fun Modifier.physics( 127 | physicsConfig: PhysicsConfig, 128 | initialX: Float, 129 | initialY: Float 130 | ): Modifier = this.then(PhysicsParentData(physicsConfig, initialX, initialY)) 131 | } 132 | ``` 133 | 134 | The code above is basic operations to define a custom layout. If you don't understand, you can learn first before reading. 135 | 136 | 137 | 138 | #### Use It 139 | 140 | Now we've finished basic definition. Let's start to implement the layout. Here are my process. 141 | 142 | 1. Initialize objects and the world 143 | 144 | 2. Use the code to simulate the movement of each object 145 | 3. Get the location and place it correctly during Layout 146 | 147 | Let's do them one after another! *(Here are just my thoughts, and some of them may not be so elegant, if you have better ideas please point them out! )* 148 | 149 | In general, there should be some code dedicated to the physical simulation process, this part of the code is class `Physics`, which is responsible for `creating the world`, `simulate`, and so on. We just pass it here. 150 | 151 | 152 | 153 | ##### initialization 154 | 155 | Considering that the specific information of each sub-component is not readable until `Layout` , so it seems that we can only initialize here; but cause the `Layout` process will be done repeatedly, and initialization should only be done once. So we use a variable to control it. 156 | 157 | 158 | ```kotlin 159 | var initialized by remember { 160 | mutableStateOf(false) 161 | } 162 | ``` 163 | 164 | They we store these`ParentData` at the first time. 165 | 166 | 167 | ```kotlin 168 | val placeables = measurables.mapIndexed { index, measurable -> 169 | val physicsParentData = (measurable.parentData as? PhysicsParentData) ?: PhysicsParentData() 170 | if (!initialized){ 171 | parentDataList.add(index, physicsParentData) 172 | } 173 | measurable.measure(childConstraints) 174 | } 175 | ``` 176 | 177 | And then, with a side effect, after all the object information is initialized, create the world and create **Body** (the class representing `rigid body` in JBox2d) 178 | 179 | 180 | ```kotlin 181 | // 初始化世界 182 | LaunchedEffect(initialized){ 183 | if (!initialized) return@LaunchedEffect 184 | physics.createWorld { body, i -> 185 | parentDataList[i].body = body 186 | } 187 | } 188 | ``` 189 | 190 | where method `createWorld` is responsible for creating `World` and do callback after each creation. 191 | 192 | 193 | 194 | ##### continuous simulation 195 | 196 | Simulating is the duty of `JBox2d` . All we have to do is call it repeatedly. 197 | 198 | 199 | ```kotlin 200 | LaunchedEffect(key1 = Unit){ 201 | while (true){ 202 | delay(16) 203 | physics.step() // 模拟 16ms 204 | } 205 | } 206 | ``` 207 | 208 | 209 | 210 | ##### Read and place correctly 211 | 212 | This is not difficult，just reading each `Body`'s position and place it in `Layout`. 213 | 214 | A special thing is，because `Body` has its rotation angle，so we need to use method`placeWithLayer`, whose signature is as below: 215 | 216 | 217 | ```kotlin 218 | fun Placeable.placeWithLayer( 219 | position: IntOffset, 220 | zIndex: Float = 0f, 221 | layerBlock: GraphicsLayerScope.() -> Unit = DefaultLayerBlock 222 | ) 223 | ``` 224 | 225 | where the third parameter `layerBlock` provides the way to `rotate`, `transform` and so on. The corresponding code is as below: 226 | 227 | 228 | ```kotlin 229 | layout(constraints.maxWidth, constraints.maxHeight){ 230 | placeables.forEachIndexed { i, placeable: Placeable -> 231 | val x = physics.metersToPixels(parentDataList[i].x).toInt() - placeable.width / 2 232 | val y = physics.metersToPixels(parentDataList[i].y).toInt() - placeable.height / 2 233 | 234 | placeable.placeWithLayer(IntOffset(x,y), zIndex = 0f, layerBlock = { 235 | rotationZ = parentDataList[i].rotation 236 | }) 237 | } 238 | } 239 | ``` 240 | 241 | The function `metersToPixels` used above is to map **physical world coordinates to reality coordinates** 242 | 243 | Done! 244 | 245 | 246 | 247 | 248 | 249 | ### Follow-up 250 | 251 | Actually, there's something not so perfect with the code right now, like, to trigger `Layout` , I actually used a state that wasn't useful... Because in my attempts, as long as `state` never appears to change, it won't be triggered (which is what Compose should behave); I can't think of any good ideas, so if you have any good ideas, please discuss them with PRs. 252 | 253 | If you're wondering what it can be used for......Well, I don't know, neither. I just thought it was fun. I've been thinking of doing it for a long time. and finally spent two days finishing it. It looks well, I think :) 254 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | id 'com.android.application' 3 | id 'org.jetbrains.kotlin.android' 4 | } 5 | 6 | android { 7 | compileSdk 31 8 | 9 | defaultConfig { 10 | applicationId "com.funny.compose.physicslayout" 11 | minSdk 21 12 | targetSdk 32 13 | versionCode 1 14 | versionName "1.0" 15 | 16 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 17 | vectorDrawables { 18 | useSupportLibrary true 19 | } 20 | } 21 | 22 | buildTypes { 23 | release { 24 | minifyEnabled false 25 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 26 | } 27 | } 28 | compileOptions { 29 | sourceCompatibility JavaVersion.VERSION_1_8 30 | targetCompatibility JavaVersion.VERSION_1_8 31 | } 32 | kotlinOptions { 33 | jvmTarget = '1.8' 34 | } 35 | buildFeatures { 36 | compose true 37 | } 38 | composeOptions { 39 | kotlinCompilerExtensionVersion compose_version 40 | } 41 | packagingOptions { 42 | resources { 43 | excludes += '/META-INF/{AL2.0,LGPL2.1}' 44 | } 45 | } 46 | } 47 | 48 | dependencies { 49 | implementation 'androidx.core:core-ktx:1.7.0' 50 | implementation "androidx.compose.ui:ui:$compose_version" 51 | implementation "androidx.compose.material:material:$compose_version" 52 | implementation "androidx.compose.ui:ui-tooling-preview:$compose_version" 53 | implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.4.0' 54 | implementation 'androidx.activity:activity-compose:1.4.0' 55 | 56 | // 提供 MaterialColors 57 | implementation "com.github.FunnySaltyFish:CMaterialColors:1.0.21" 58 | 59 | implementation project(path : ":physics") 60 | testImplementation 'junit:junit:4.13.2' 61 | androidTestImplementation 'androidx.test.ext:junit:1.1.3' 62 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0' 63 | androidTestImplementation "androidx.compose.ui:ui-test-junit4:$compose_version" 64 | debugImplementation "androidx.compose.ui:ui-tooling:$compose_version" 65 | debugImplementation "androidx.compose.ui:ui-test-manifest:$compose_version" 66 | } -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile -------------------------------------------------------------------------------- /app/src/androidTest/java/com/funny/compose/physicslayout/ExampleInstrumentedTest.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physicslayout 2 | 3 | import androidx.test.platform.app.InstrumentationRegistry 4 | import androidx.test.ext.junit.runners.AndroidJUnit4 5 | 6 | import org.junit.Test 7 | import org.junit.runner.RunWith 8 | 9 | import org.junit.Assert.* 10 | 11 | /** 12 | * Instrumented test, which will execute on an Android device. 13 | * 14 | * See [testing documentation](http://d.android.com/tools/testing). 15 | */ 16 | @RunWith(AndroidJUnit4::class) 17 | class ExampleInstrumentedTest { 18 | @Test 19 | fun useAppContext() { 20 | // Context of the app under test. 21 | val appContext = InstrumentationRegistry.getInstrumentation().targetContext 22 | assertEquals("com.funny.compose.physicslayout", appContext.packageName) 23 | } 24 | } -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 6 | 16 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | -------------------------------------------------------------------------------- /app/src/main/java/com/funny/compose/physicslayout/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physicslayout 2 | 3 | import android.content.Intent 4 | import android.net.Uri 5 | import android.os.Bundle 6 | import androidx.activity.ComponentActivity 7 | import androidx.activity.compose.setContent 8 | import androidx.compose.foundation.Image 9 | import androidx.compose.foundation.background 10 | import androidx.compose.foundation.layout.* 11 | import androidx.compose.foundation.lazy.LazyColumn 12 | import androidx.compose.foundation.shape.CircleShape 13 | import androidx.compose.foundation.text.ClickableText 14 | import androidx.compose.material.* 15 | import androidx.compose.runtime.* 16 | import androidx.compose.ui.Modifier 17 | import androidx.compose.ui.draw.clip 18 | import androidx.compose.ui.graphics.Color 19 | import androidx.compose.ui.platform.LocalContext 20 | import androidx.compose.ui.res.painterResource 21 | import androidx.compose.ui.text.SpanStyle 22 | import androidx.compose.ui.text.buildAnnotatedString 23 | import androidx.compose.ui.text.font.FontWeight 24 | import androidx.compose.ui.text.style.TextDecoration 25 | import androidx.compose.ui.text.withStyle 26 | import androidx.compose.ui.unit.dp 27 | import androidx.compose.ui.unit.sp 28 | import com.funny.cmaterialcolors.MaterialColors 29 | import com.funny.compose.physics.PhysicsConfig 30 | import com.funny.compose.physics.PhysicsLayout 31 | import com.funny.compose.physics.PhysicsLayoutState 32 | import com.funny.compose.physics.PhysicsShape 33 | import com.funny.compose.physicslayout.ui.RandomColorBox 34 | import com.funny.compose.physicslayout.ui.theme.JetpackComposePhysicsLayoutTheme 35 | import kotlin.random.Random 36 | 37 | class MainActivity : ComponentActivity() { 38 | override fun onCreate(savedInstanceState: Bundle?) { 39 | super.onCreate(savedInstanceState) 40 | setContent { 41 | JetpackComposePhysicsLayoutTheme { 42 | Surface( 43 | modifier = Modifier.fillMaxSize(), 44 | color = MaterialTheme.colors.background 45 | ) { 46 | Column( 47 | Modifier 48 | .fillMaxSize() 49 | .padding(8.dp)) { 50 | val physicsLayoutState by remember { 51 | mutableStateOf(PhysicsLayoutState()) 52 | } 53 | var boundSize by remember { 54 | mutableStateOf(20) 55 | } 56 | PhysicsLayoutTest( 57 | Modifier 58 | .fillMaxWidth() 59 | .fillMaxHeight(0.8f), 60 | physicsLayoutState, 61 | boundSize 62 | ) 63 | Row(Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceAround) { 64 | Button(onClick = { physicsLayoutState.giveRandomImpulse() }) { 65 | Text(text = "随机给个冲量") 66 | } 67 | Button(onClick = { 68 | physicsLayoutState.setGravity( 69 | Random.nextDouble(-5.0,5.0).toFloat(), 70 | Random.nextDouble(-9.8,9.8).toFloat() 71 | ) 72 | }) { 73 | Text(text = "随机重力") 74 | } 75 | Button(onClick = { 76 | boundSize = Random.nextInt(5,20) 77 | }) { 78 | Text(text = "随机边框大小") 79 | } 80 | } 81 | 82 | } 83 | } 84 | } 85 | } 86 | } 87 | } 88 | 89 | val physicsConfig = PhysicsConfig() 90 | @Composable 91 | fun PhysicsLayoutTest(modifier: Modifier, physicsLayoutState: PhysicsLayoutState, boundSize : Int) { 92 | PhysicsLayout(modifier = modifier, physicsLayoutState = physicsLayoutState, boundSize = boundSize.toFloat()) { 93 | RandomColorBox(modifier = Modifier 94 | .size(40.dp) 95 | .physics(physicsConfig, initialX = 300f, initialY = 500f)) 96 | // This one has a circle shape 97 | // so you need to modify it with not only a `clip()` Modifier to make it "looks like" a circle 98 | // but also a `physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE)` Modifier to create a circle Body 99 | RandomColorBox(modifier = Modifier 100 | .clip(CircleShape) 101 | .size(50.dp) 102 | .physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE), 300f, 1000f)) 103 | RandomColorBox(modifier = Modifier 104 | .size(60.dp) 105 | .physics(physicsConfig)) 106 | var checked by remember { 107 | mutableStateOf(false) 108 | } 109 | Checkbox(checked = checked, onCheckedChange = { checked = it }) 110 | Card(modifier = Modifier 111 | .clip(CircleShape) 112 | .physics(physicsConfig.copy(shape = PhysicsShape.CIRCLE), initialX = 200f)) { 113 | Image(painter = painterResource(id = R.drawable.bg_avatar), contentDescription = "avatar", modifier = Modifier.size(100.dp)) 114 | } 115 | val context = LocalContext.current 116 | LazyColumn(modifier = Modifier 117 | .width(200.dp) 118 | .height(100.dp) 119 | .background(MaterialColors.Orange200) 120 | .physics(physicsConfig, initialY = 300f)){ 121 | item { 122 | ClickableText(text = buildAnnotatedString { 123 | withStyle( 124 | style = SpanStyle( 125 | color = Color.Blue, 126 | fontWeight = FontWeight.Bold, 127 | textDecoration = TextDecoration.Underline 128 | ) 129 | ) { 130 | append("Github/JetpackComposePhysicsLayout") 131 | } 132 | }){ 133 | Intent().apply { 134 | action = Intent.ACTION_VIEW 135 | data = Uri.parse("https://github.com/FunnySaltyFish/JetpackComposePhysicsLayout") 136 | }.also { 137 | context.startActivity(it) 138 | } 139 | } 140 | } 141 | items(10){ 142 | Text(text = "FunnySaltyFish", modifier = Modifier.padding(8.dp), fontWeight = FontWeight.W500, fontSize = 18.sp) 143 | } 144 | } 145 | } 146 | } -------------------------------------------------------------------------------- /app/src/main/java/com/funny/compose/physicslayout/ui/RandomColorBox.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physicslayout.ui 2 | 3 | import androidx.compose.foundation.background 4 | import androidx.compose.foundation.layout.Box 5 | import androidx.compose.runtime.Composable 6 | import androidx.compose.runtime.saveable.Saver 7 | import androidx.compose.runtime.saveable.rememberSaveable 8 | import androidx.compose.ui.Modifier 9 | import androidx.compose.ui.graphics.Color 10 | import androidx.compose.ui.graphics.toArgb 11 | import kotlin.random.Random 12 | 13 | fun randomColor() = Color(Random.nextInt(255), Random.nextInt(255), Random.nextInt(255)) 14 | 15 | @Composable 16 | fun rememberRandomColor() = rememberSaveable( 17 | saver = Saver( 18 | save = { value -> 19 | value.toArgb() 20 | }, 21 | restore = { 22 | Color(it) 23 | } 24 | ) 25 | ) { 26 | randomColor() 27 | } 28 | 29 | @Composable 30 | fun RandomColorBox(modifier: Modifier) { 31 | Box(modifier = modifier.background(rememberRandomColor())) 32 | } -------------------------------------------------------------------------------- /app/src/main/java/com/funny/compose/physicslayout/ui/theme/Color.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physicslayout.ui.theme 2 | 3 | import androidx.compose.ui.graphics.Color 4 | 5 | val Purple200 = Color(0xFFBB86FC) 6 | val Purple500 = Color(0xFF6200EE) 7 | val Purple700 = Color(0xFF3700B3) 8 | val Teal200 = Color(0xFF03DAC5) -------------------------------------------------------------------------------- /app/src/main/java/com/funny/compose/physicslayout/ui/theme/Shape.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physicslayout.ui.theme 2 | 3 | import androidx.compose.foundation.shape.RoundedCornerShape 4 | import androidx.compose.material.Shapes 5 | import androidx.compose.ui.unit.dp 6 | 7 | val Shapes = Shapes( 8 | small = RoundedCornerShape(4.dp), 9 | medium = RoundedCornerShape(4.dp), 10 | large = RoundedCornerShape(0.dp) 11 | ) -------------------------------------------------------------------------------- /app/src/main/java/com/funny/compose/physicslayout/ui/theme/Theme.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physicslayout.ui.theme 2 | 3 | import androidx.compose.foundation.isSystemInDarkTheme 4 | import androidx.compose.material.MaterialTheme 5 | import androidx.compose.material.darkColors 6 | import androidx.compose.material.lightColors 7 | import androidx.compose.runtime.Composable 8 | 9 | private val DarkColorPalette = darkColors( 10 | primary = Purple200, 11 | primaryVariant = Purple700, 12 | secondary = Teal200 13 | ) 14 | 15 | private val LightColorPalette = lightColors( 16 | primary = Purple500, 17 | primaryVariant = Purple700, 18 | secondary = Teal200 19 | 20 | /* Other default colors to override 21 | background = Color.White, 22 | surface = Color.White, 23 | onPrimary = Color.White, 24 | onSecondary = Color.Black, 25 | onBackground = Color.Black, 26 | onSurface = Color.Black, 27 | */ 28 | ) 29 | 30 | @Composable 31 | fun JetpackComposePhysicsLayoutTheme( 32 | darkTheme: Boolean = isSystemInDarkTheme(), 33 | content: @Composable () -> Unit 34 | ) { 35 | val colors = if (darkTheme) { 36 | DarkColorPalette 37 | } else { 38 | LightColorPalette 39 | } 40 | 41 | MaterialTheme( 42 | colors = colors, 43 | typography = Typography, 44 | shapes = Shapes, 45 | content = content 46 | ) 47 | } -------------------------------------------------------------------------------- /app/src/main/java/com/funny/compose/physicslayout/ui/theme/Type.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physicslayout.ui.theme 2 | 3 | import androidx.compose.material.Typography 4 | import androidx.compose.ui.text.TextStyle 5 | import androidx.compose.ui.text.font.FontFamily 6 | import androidx.compose.ui.text.font.FontWeight 7 | import androidx.compose.ui.unit.sp 8 | 9 | // Set of Material typography styles to start with 10 | val Typography = Typography( 11 | body1 = TextStyle( 12 | fontFamily = FontFamily.Default, 13 | fontWeight = FontWeight.Normal, 14 | fontSize = 16.sp 15 | ) 16 | /* Other default text styles to override 17 | button = TextStyle( 18 | fontFamily = FontFamily.Default, 19 | fontWeight = FontWeight.W500, 20 | fontSize = 14.sp 21 | ), 22 | caption = TextStyle( 23 | fontFamily = FontFamily.Default, 24 | fontWeight = FontWeight.Normal, 25 | fontSize = 12.sp 26 | ) 27 | */ 28 | ) -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 8 | 9 | 15 | 18 | 21 | 22 | 23 | 24 | 30 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/bg_avatar.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/app/src/main/res/drawable/bg_avatar.jpg -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher.webp: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/app/src/main/res/mipmap-hdpi/ic_launcher.webp -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher_round.webp: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher.webp: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/app/src/main/res/mipmap-mdpi/ic_launcher.webp -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher_round.webp: -------------------------------------------------------------------------------- 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https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp -------------------------------------------------------------------------------- /app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #FFBB86FC 4 | #FF6200EE 5 | #FF3700B3 6 | #FF03DAC5 7 | #FF018786 8 | #FF000000 9 | #FFFFFFFF 10 | -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | JetpackComposePhysicsLayout 3 | -------------------------------------------------------------------------------- /app/src/main/res/values/themes.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 7 | -------------------------------------------------------------------------------- /app/src/main/res/xml/backup_rules.xml: -------------------------------------------------------------------------------- 1 | 8 | 9 | 13 | -------------------------------------------------------------------------------- /app/src/main/res/xml/data_extraction_rules.xml: -------------------------------------------------------------------------------- 1 | 6 | 7 | 8 | 12 | 13 | 19 | -------------------------------------------------------------------------------- /app/src/test/java/com/funny/compose/physicslayout/ExampleUnitTest.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physicslayout 2 | 3 | import org.junit.Test 4 | 5 | import org.junit.Assert.* 6 | 7 | /** 8 | * Example local unit test, which will execute on the development machine (host). 9 | * 10 | * See [testing documentation](http://d.android.com/tools/testing). 11 | */ 12 | class ExampleUnitTest { 13 | @Test 14 | fun addition_isCorrect() { 15 | assertEquals(4, 2 + 2) 16 | } 17 | } -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | buildscript { 2 | ext { 3 | compose_version = '1.2.0-beta02' 4 | kotlin_version = "1.6.21" 5 | version_name = "1.0.0" 6 | } 7 | repositories { 8 | mavenLocal() 9 | //maven { url 'https://repo.huaweicloud.com/repository/maven/'} 10 | maven { url 'https://maven.aliyun.com/repository/public/' } 11 | maven { url 'https://maven.aliyun.com/repository/google/'} 12 | maven { url 'https://maven.aliyun.com/repository/jcenter/'} 13 | maven { url "https://jitpack.io" } 14 | google() 15 | } 16 | dependencies { 17 | classpath "com.android.tools.build:gradle:7.1.1" 18 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" 19 | 20 | // NOTE: Do not place your application dependencies here; they belong 21 | // in the individual module build.gradle files 22 | } 23 | } 24 | task clean(type: Delete) { 25 | delete rootProject.buildDir 26 | } -------------------------------------------------------------------------------- /demo.apk: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/demo.apk -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | # Project-wide Gradle settings. 2 | # IDE (e.g. Android Studio) users: 3 | # Gradle settings configured through the IDE *will override* 4 | # any settings specified in this file. 5 | # For more details on how to configure your build environment visit 6 | # http://www.gradle.org/docs/current/userguide/build_environment.html 7 | # Specifies the JVM arguments used for the daemon process. 8 | # The setting is particularly useful for tweaking memory settings. 9 | org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8 10 | # When configured, Gradle will run in incubating parallel mode. 11 | # This option should only be used with decoupled projects. More details, visit 12 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 13 | # org.gradle.parallel=true 14 | # AndroidX package structure to make it clearer which packages are bundled with the 15 | # Android operating system, and which are packaged with your app"s APK 16 | # https://developer.android.com/topic/libraries/support-library/androidx-rn 17 | android.useAndroidX=true 18 | # Kotlin code style for this project: "official" or "obsolete": 19 | kotlin.code.style=official 20 | # Enables namespacing of each library's R class so that its R class includes only the 21 | # resources declared in the library itself and none from the library's dependencies, 22 | # thereby reducing the size of the R class for that library 23 | android.nonTransitiveRClass=true -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Tue May 31 12:22:51 CST 2022 2 | distributionBase=GRADLE_USER_HOME 3 | distributionUrl=https\://services.gradle.org/distributions/gradle-7.3-bin.zip 4 | distributionPath=wrapper/dists 5 | zipStorePath=wrapper/dists 6 | zipStoreBase=GRADLE_USER_HOME 7 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | # 4 | # Copyright 2015 the original author or authors. 5 | # 6 | # Licensed under the Apache License, Version 2.0 (the "License"); 7 | # you may not use this file except in compliance with the License. 8 | # You may obtain a copy of the License at 9 | # 10 | # https://www.apache.org/licenses/LICENSE-2.0 11 | # 12 | # Unless required by applicable law or agreed to in writing, software 13 | # distributed under the License is distributed on an "AS IS" BASIS, 14 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 | # See the License for the specific language governing permissions and 16 | # limitations under the License. 17 | # 18 | 19 | ############################################################################## 20 | ## 21 | ## Gradle start up script for UN*X 22 | ## 23 | ############################################################################## 24 | 25 | # Attempt to set APP_HOME 26 | # Resolve links: $0 may be a link 27 | PRG="$0" 28 | # Need this for relative symlinks. 29 | while [ -h "$PRG" ] ; do 30 | ls=`ls -ld "$PRG"` 31 | link=`expr "$ls" : '.*-> \(.*\)$'` 32 | if expr "$link" : '/.*' > /dev/null; then 33 | PRG="$link" 34 | else 35 | PRG=`dirname "$PRG"`"/$link" 36 | fi 37 | done 38 | SAVED="`pwd`" 39 | cd "`dirname \"$PRG\"`/" >/dev/null 40 | APP_HOME="`pwd -P`" 41 | cd "$SAVED" >/dev/null 42 | 43 | APP_NAME="Gradle" 44 | APP_BASE_NAME=`basename "$0"` 45 | 46 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 47 | DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' 48 | 49 | # Use the maximum available, or set MAX_FD != -1 to use that value. 50 | MAX_FD="maximum" 51 | 52 | warn () { 53 | echo "$*" 54 | } 55 | 56 | die () { 57 | echo 58 | echo "$*" 59 | echo 60 | exit 1 61 | } 62 | 63 | # OS specific support (must be 'true' or 'false'). 64 | cygwin=false 65 | msys=false 66 | darwin=false 67 | nonstop=false 68 | case "`uname`" in 69 | CYGWIN* ) 70 | cygwin=true 71 | ;; 72 | Darwin* ) 73 | darwin=true 74 | ;; 75 | MINGW* ) 76 | msys=true 77 | ;; 78 | NONSTOP* ) 79 | nonstop=true 80 | ;; 81 | esac 82 | 83 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 84 | 85 | 86 | # Determine the Java command to use to start the JVM. 87 | if [ -n "$JAVA_HOME" ] ; then 88 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 89 | # IBM's JDK on AIX uses strange locations for the executables 90 | JAVACMD="$JAVA_HOME/jre/sh/java" 91 | else 92 | JAVACMD="$JAVA_HOME/bin/java" 93 | fi 94 | if [ ! -x "$JAVACMD" ] ; then 95 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 96 | 97 | Please set the JAVA_HOME variable in your environment to match the 98 | location of your Java installation." 99 | fi 100 | else 101 | JAVACMD="java" 102 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 103 | 104 | Please set the JAVA_HOME variable in your environment to match the 105 | location of your Java installation." 106 | fi 107 | 108 | # Increase the maximum file descriptors if we can. 109 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 110 | MAX_FD_LIMIT=`ulimit -H -n` 111 | if [ $? -eq 0 ] ; then 112 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 113 | MAX_FD="$MAX_FD_LIMIT" 114 | fi 115 | ulimit -n $MAX_FD 116 | if [ $? -ne 0 ] ; then 117 | warn "Could not set maximum file descriptor limit: $MAX_FD" 118 | fi 119 | else 120 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 121 | fi 122 | fi 123 | 124 | # For Darwin, add options to specify how the application appears in the dock 125 | if $darwin; then 126 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 127 | fi 128 | 129 | # For Cygwin or MSYS, switch paths to Windows format before running java 130 | if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then 131 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 132 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 133 | 134 | JAVACMD=`cygpath --unix "$JAVACMD"` 135 | 136 | # We build the pattern for arguments to be converted via cygpath 137 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 138 | SEP="" 139 | for dir in $ROOTDIRSRAW ; do 140 | ROOTDIRS="$ROOTDIRS$SEP$dir" 141 | SEP="|" 142 | done 143 | OURCYGPATTERN="(^($ROOTDIRS))" 144 | # Add a user-defined pattern to the cygpath arguments 145 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 146 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 147 | fi 148 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 149 | i=0 150 | for arg in "$@" ; do 151 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 152 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 153 | 154 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 155 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 156 | else 157 | eval `echo args$i`="\"$arg\"" 158 | fi 159 | i=`expr $i + 1` 160 | done 161 | case $i in 162 | 0) set -- ;; 163 | 1) set -- "$args0" ;; 164 | 2) set -- "$args0" "$args1" ;; 165 | 3) set -- "$args0" "$args1" "$args2" ;; 166 | 4) set -- "$args0" "$args1" "$args2" "$args3" ;; 167 | 5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 168 | 6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 169 | 7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 170 | 8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 171 | 9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 172 | esac 173 | fi 174 | 175 | # Escape application args 176 | save () { 177 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 178 | echo " " 179 | } 180 | APP_ARGS=`save "$@"` 181 | 182 | # Collect all arguments for the java command, following the shell quoting and substitution rules 183 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 184 | 185 | exec "$JAVACMD" "$@" 186 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @rem 2 | @rem Copyright 2015 the original author or authors. 3 | @rem 4 | @rem Licensed under the Apache License, Version 2.0 (the "License"); 5 | @rem you may not use this file except in compliance with the License. 6 | @rem You may obtain a copy of the License at 7 | @rem 8 | @rem https://www.apache.org/licenses/LICENSE-2.0 9 | @rem 10 | @rem Unless required by applicable law or agreed to in writing, software 11 | @rem distributed under the License is distributed on an "AS IS" BASIS, 12 | @rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | @rem See the License for the specific language governing permissions and 14 | @rem limitations under the License. 15 | @rem 16 | 17 | @if "%DEBUG%" == "" @echo off 18 | @rem ########################################################################## 19 | @rem 20 | @rem Gradle startup script for Windows 21 | @rem 22 | @rem ########################################################################## 23 | 24 | @rem Set local scope for the variables with windows NT shell 25 | if "%OS%"=="Windows_NT" setlocal 26 | 27 | set DIRNAME=%~dp0 28 | if "%DIRNAME%" == "" set DIRNAME=. 29 | set APP_BASE_NAME=%~n0 30 | set APP_HOME=%DIRNAME% 31 | 32 | @rem Resolve any "." and ".." in APP_HOME to make it shorter. 33 | for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi 34 | 35 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 36 | set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" 37 | 38 | @rem Find java.exe 39 | if defined JAVA_HOME goto findJavaFromJavaHome 40 | 41 | set JAVA_EXE=java.exe 42 | %JAVA_EXE% -version >NUL 2>&1 43 | if "%ERRORLEVEL%" == "0" goto execute 44 | 45 | echo. 46 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 47 | echo. 48 | echo Please set the JAVA_HOME variable in your environment to match the 49 | echo location of your Java installation. 50 | 51 | goto fail 52 | 53 | :findJavaFromJavaHome 54 | set JAVA_HOME=%JAVA_HOME:"=% 55 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 56 | 57 | if exist "%JAVA_EXE%" goto execute 58 | 59 | echo. 60 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 61 | echo. 62 | echo Please set the JAVA_HOME variable in your environment to match the 63 | echo location of your Java installation. 64 | 65 | goto fail 66 | 67 | :execute 68 | @rem Setup the command line 69 | 70 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 71 | 72 | 73 | @rem Execute Gradle 74 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* 75 | 76 | :end 77 | @rem End local scope for the variables with windows NT shell 78 | if "%ERRORLEVEL%"=="0" goto mainEnd 79 | 80 | :fail 81 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 82 | rem the _cmd.exe /c_ return code! 83 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 84 | exit /b 1 85 | 86 | :mainEnd 87 | if "%OS%"=="Windows_NT" endlocal 88 | 89 | :omega 90 | -------------------------------------------------------------------------------- /jitpack.yml: -------------------------------------------------------------------------------- 1 | jdk: 2 | - openjdk11 -------------------------------------------------------------------------------- /physics/.gitignore: -------------------------------------------------------------------------------- 1 | /build -------------------------------------------------------------------------------- /physics/build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | id 'com.android.library' 3 | id 'kotlin-android' 4 | id 'maven-publish' 5 | } 6 | 7 | task generateSourcesJar(type: Jar) { 8 | from android.sourceSets.main.java.srcDirs 9 | classifier 'sources' 10 | } 11 | 12 | android { 13 | compileSdk 31 14 | 15 | defaultConfig { 16 | minSdk 21 17 | targetSdk 32 18 | 19 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 20 | consumerProguardFiles "consumer-rules.pro" 21 | } 22 | 23 | buildTypes { 24 | release { 25 | minifyEnabled false 26 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 27 | } 28 | } 29 | compileOptions { 30 | sourceCompatibility JavaVersion.VERSION_1_8 31 | targetCompatibility JavaVersion.VERSION_1_8 32 | } 33 | kotlinOptions { 34 | jvmTarget = '1.8' 35 | } 36 | buildFeatures { 37 | compose true 38 | } 39 | composeOptions { 40 | kotlinCompilerExtensionVersion compose_version 41 | } 42 | packagingOptions { 43 | resources { 44 | excludes += '/META-INF/{AL2.0,LGPL2.1}' 45 | } 46 | } 47 | 48 | publishing { 49 | singleVariant("release") 50 | } 51 | } 52 | 53 | afterEvaluate { 54 | publishing { 55 | def versionName = version_name 56 | publications { 57 | // Creates a Maven publication called "release". 58 | release(MavenPublication) { 59 | // Applies the component for the release build variant. 60 | from components.release 61 | 62 | // You can then customize attributes of the publication as shown below. 63 | groupId = 'com.funny.compose' 64 | artifactId = 'physics-layout' 65 | version = versionName 66 | } 67 | } 68 | repositories { 69 | maven { 70 | // change URLs to point to your repos, e.g. http://my.org/repo 71 | def baseUrl = buildDir.getParent() 72 | def releasesRepoUrl = "$baseUrl/repos/releases" 73 | def snapshotsRepoUrl = "$baseUrl/repos/snapshots" 74 | url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl 75 | } 76 | } 77 | } 78 | } 79 | 80 | dependencies { 81 | implementation 'androidx.core:core-ktx:1.7.0' 82 | implementation "androidx.compose.ui:ui:$compose_version" 83 | 84 | // kotlin 85 | implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version" 86 | 87 | api 'org.jbox2d:jbox2d-library:2.2.1.1' 88 | 89 | testImplementation 'junit:junit:4.13.2' 90 | androidTestImplementation 'androidx.test.ext:junit:1.1.3' 91 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0' 92 | } -------------------------------------------------------------------------------- /physics/consumer-rules.pro: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/physics/consumer-rules.pro -------------------------------------------------------------------------------- /physics/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile -------------------------------------------------------------------------------- /physics/repos/releases/com/funny/compose/physics-layout/1.0.0/physics-layout-1.0.0.aar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/physics/repos/releases/com/funny/compose/physics-layout/1.0.0/physics-layout-1.0.0.aar -------------------------------------------------------------------------------- /physics/repos/releases/com/funny/compose/physics-layout/1.0.0/physics-layout-1.0.0.aar.md5: -------------------------------------------------------------------------------- 1 | bfc44af9479de8bdae1217c90126cc55 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61 | }, 62 | { 63 | "group": "androidx.core", 64 | "module": "core-ktx", 65 | "version": { 66 | "requires": "1.7.0" 67 | } 68 | }, 69 | { 70 | "group": "androidx.compose.ui", 71 | "module": "ui", 72 | "version": { 73 | "requires": "1.2.0-beta02" 74 | } 75 | }, 76 | { 77 | "group": "org.jetbrains.kotlin", 78 | "module": "kotlin-stdlib-jdk8", 79 | "version": { 80 | "requires": "1.6.21" 81 | } 82 | } 83 | ], 84 | "files": [ 85 | { 86 | "name": "physics-layout-1.0.0.aar", 87 | "url": "physics-layout-1.0.0.aar", 88 | "size": 66932, 89 | "sha512": "cc72bc184332517f72adbdbd7b70c03db7bdb9fba8e866b52bab30fc95b677e5c80452e93c6d4ecd320dc0885972e08312a31a7e28d989b4f45eaf97e5941b7a", 90 | "sha256": "becff5c82630160313c53082a85efa911dddde738add370d6adcf5f055dd6ba2", 91 | "sha1": "af35e0385849cb67fc2e35b2d8d738986dda24bc", 92 | "md5": "bfc44af9479de8bdae1217c90126cc55" 93 | } 94 | ] 95 | } 96 | ] 97 | } 98 | -------------------------------------------------------------------------------- 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-------------------------------------------------------------------------------- /physics/src/androidTest/java/com/funny/compose/physics/ExampleInstrumentedTest.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physics 2 | 3 | import androidx.test.platform.app.InstrumentationRegistry 4 | import androidx.test.ext.junit.runners.AndroidJUnit4 5 | 6 | import org.junit.Test 7 | import org.junit.runner.RunWith 8 | 9 | import org.junit.Assert.* 10 | 11 | /** 12 | * Instrumented test, which will execute on an Android device. 13 | * 14 | * See [testing documentation](http://d.android.com/tools/testing). 15 | */ 16 | @RunWith(AndroidJUnit4::class) 17 | class ExampleInstrumentedTest { 18 | @Test 19 | fun useAppContext() { 20 | // Context of the app under test. 21 | val appContext = InstrumentationRegistry.getInstrumentation().targetContext 22 | assertEquals("com.funny.compose.physics.test", appContext.packageName) 23 | } 24 | } -------------------------------------------------------------------------------- /physics/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | -------------------------------------------------------------------------------- /physics/src/main/java/com/funny/compose/physics/Bound.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physics 2 | 3 | import org.jbox2d.dynamics.Body 4 | 5 | /** 6 | * A bound around the edge of the view 7 | */ 8 | data class Bound( 9 | val widthInPixels: Float, 10 | val heightInPixels: Float, 11 | val body: Body, 12 | val side: Side 13 | ) { 14 | enum class Side { 15 | TOP, 16 | LEFT, 17 | RIGHT, 18 | BOTTOM 19 | } 20 | } 21 | -------------------------------------------------------------------------------- /physics/src/main/java/com/funny/compose/physics/LayoutRecomposeTest.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physics 2 | 3 | import android.util.Log 4 | import androidx.compose.runtime.* 5 | import androidx.compose.ui.Modifier 6 | import androidx.compose.ui.layout.Layout 7 | import androidx.compose.ui.layout.Measurable 8 | import androidx.compose.ui.unit.Constraints 9 | import kotlinx.coroutines.delay 10 | 11 | // this file DOSE NOT BELONG TO THE LIBRARY 12 | // it is just used for test 13 | data class Point(var x : Int, var y : Int) 14 | private const val TAG = "LayoutRecomposeTest" 15 | @Composable 16 | fun LayoutRecomposeTest( 17 | modifier: Modifier = Modifier, 18 | content: @Composable () -> Unit 19 | ) { 20 | val positions = remember { 21 | mutableStateListOf( 22 | Point(0,0), Point(50,50) 23 | ) 24 | } 25 | 26 | var yy by remember { 27 | mutableStateOf(0) 28 | } 29 | 30 | LaunchedEffect(key1 = Unit){ 31 | Log.d(TAG, "LayoutRecomposeTest: Recompose") 32 | while (true){ 33 | delay(400) 34 | positions.forEach { 35 | it.x += 1 36 | it.y += 1 37 | yy += 1 38 | // Log.d(TAG, "LayoutRecomposeTest: $it") 39 | } 40 | } 41 | } 42 | 43 | Layout( 44 | modifier = modifier, 45 | content = content 46 | ) { measurables: List, constraints: Constraints -> 47 | val childConstraints = constraints.copy(minWidth = 0, minHeight = 0) 48 | val placeables = measurables.map { it.measure(childConstraints) } 49 | // 宽度：最宽的一项 50 | val width = placeables.maxOf { it.width } 51 | // 高度：所有子微件高度之和 52 | val height = placeables.sumOf { it.height } 53 | layout(width, height) { 54 | // yy 为 mutableStateOf 可以 55 | val y = yy 56 | // Log.d(TAG, "LayoutRecomposeTest: $y") 57 | placeables.forEachIndexed { i , placeable -> 58 | placeable.placeRelative(0, derivedStateOf { positions[i].y }.value) 59 | } 60 | } 61 | } 62 | } -------------------------------------------------------------------------------- /physics/src/main/java/com/funny/compose/physics/Physics.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physics 2 | 3 | import android.graphics.Color 4 | import android.graphics.Paint 5 | import android.util.Log 6 | import android.view.MotionEvent 7 | import android.view.View 8 | import com.funny.compose.physics.Bound 9 | import org.jbox2d.callbacks.ContactImpulse 10 | import org.jbox2d.callbacks.ContactListener 11 | import org.jbox2d.collision.Manifold 12 | import org.jbox2d.collision.shapes.CircleShape 13 | import org.jbox2d.collision.shapes.PolygonShape 14 | import org.jbox2d.common.Vec2 15 | import org.jbox2d.dynamics.* 16 | import org.jbox2d.dynamics.contacts.Contact 17 | import java.util.* 18 | import kotlin.collections.ArrayList 19 | import kotlin.math.max 20 | import kotlin.properties.Delegates 21 | 22 | class ComposableGroup(var physicsParentDatas: ArrayList){ 23 | val childCount : Int 24 | get() = physicsParentDatas.size 25 | fun getChildAt(index : Int) = physicsParentDatas[index] 26 | } 27 | 28 | /** 29 | * This file originally comes from [Here](https://github.com/Jawnnypoo/PhysicsLayout) 30 | * 31 | * I modified some to make it suitable for Compose 32 | * 33 | * -- original comment is as below -- 34 | * 35 | * Implementation for physics layout is found here, since we want to offer the main 36 | * layouts without requiring further extension (LinearLayout, RelativeLayout, etc.) 37 | */ 38 | @Suppress("unused", "MemberVisibilityCanBePrivate") 39 | class Physics constructor(val composableGroup: ComposableGroup) { 40 | 41 | companion object { 42 | private val TAG = Physics::class.java.simpleName 43 | const val NO_GRAVITY = 0.0f 44 | const val MOON_GRAVITY = 1.6f 45 | const val EARTH_GRAVITY = 9.8f 46 | const val JUPITER_GRAVITY = 24.8f 47 | 48 | // Size in DP of the bounds (world walls) of the view 49 | private const val BOUND_SIZE_DP = 20 50 | private const val FRAME_RATE = 1 / 60f 51 | 52 | const val ID_BOUND_TOP = 0 53 | const val ID_BOUND_LEFT = 1 54 | const val ID_BOUND_RIGHT = 2 55 | const val ID_BOUND_BOTTOM = 3 56 | 57 | } 58 | 59 | private val debugDraw = false 60 | private val debugLog = false 61 | 62 | /** 63 | * Set the number of velocity iterations the world will perform at each step. 64 | * Default is 8 65 | */ 66 | var velocityIterations = 8 67 | 68 | /** 69 | * Set the number of position iterations the world will perform at each step. 70 | * Default is 3 71 | */ 72 | var positionIterations = 3 73 | 74 | /** 75 | * Set the number of pixels per meter. Basically makes the world feel bigger or smaller 76 | * Default is 20dp. More pixels per meter = ui feeling bigger in the world (faster movement) 77 | */ 78 | var pixelsPerMeter = 0f 79 | 80 | /** 81 | * Get the current Box2D [World] controlling the physics of this view 82 | */ 83 | var world: World? = null 84 | private set 85 | 86 | /** 87 | * Enable/disable physics on the view 88 | */ 89 | var isPhysicsEnabled = true 90 | 91 | /** 92 | * Enable/disable fling for this View 93 | */ 94 | var isFlingEnabled = false 95 | 96 | /** 97 | * Enables/disables if the view has bounds or not 98 | */ 99 | var hasBounds = true 100 | 101 | var boundsSizeInPixel = 1f 102 | val bounds = mutableListOf() 103 | private var gravityX = 0.0f 104 | private var gravityY = EARTH_GRAVITY 105 | 106 | private val debugPaint: Paint by lazy { 107 | val paint = Paint() 108 | paint.color = Color.MAGENTA 109 | paint.style = Paint.Style.STROKE 110 | paint 111 | } 112 | 113 | var density = 0f 114 | var width = 0 115 | var height = 0 116 | 117 | private var viewBeingDragged: View? = null 118 | private var onFlingListener: OnFlingListener? = null 119 | private var onCollisionListener: OnCollisionListener? = null 120 | private var onPhysicsProcessedListeners = mutableListOf() 121 | 122 | private val contactListener: ContactListener = object : ContactListener { 123 | override fun beginContact(contact: Contact) { 124 | if (onCollisionListener != null) { 125 | onCollisionListener!!.onCollisionEntered(contact.fixtureA.m_userData as Int, 126 | contact.fixtureB.m_userData as Int) 127 | } 128 | } 129 | 130 | override fun endContact(contact: Contact) { 131 | if (onCollisionListener != null) { 132 | onCollisionListener!!.onCollisionExited(contact.fixtureA.m_userData as Int, 133 | contact.fixtureB.m_userData as Int) 134 | } 135 | } 136 | 137 | override fun preSolve(contact: Contact, oldManifold: Manifold) {} 138 | override fun postSolve(contact: Contact, impulse: ContactImpulse) {} 139 | } 140 | 141 | fun step(){ 142 | world?.step(FRAME_RATE, velocityIterations, positionIterations) 143 | } 144 | 145 | fun metersToPixels(meters: Float): Float { 146 | return meters * pixelsPerMeter 147 | } 148 | 149 | fun pixelsToMeters(pixels: Float): Float { 150 | return pixels / pixelsPerMeter 151 | } 152 | 153 | private fun radiansToDegrees(radians: Float): Float { 154 | return radians / 3.14f * 180f 155 | } 156 | 157 | private fun degreesToRadians(degrees: Float): Float { 158 | return degrees / 180f * 3.14f 159 | } 160 | 161 | /** 162 | * Call this every time your view gets a call to onSizeChanged so that the world can 163 | * respond to this change. 164 | */ 165 | fun setSize(width: Int, height: Int) { 166 | this.width = width 167 | this.height = height 168 | } 169 | 170 | /** 171 | * Call this in your ViewGroup if you plan on using fling 172 | * @return true if consumed, false otherwise 173 | */ 174 | fun onTouchEvent(ev: MotionEvent): Boolean { 175 | if (!isFlingEnabled) { 176 | return false 177 | } 178 | return true 179 | } 180 | 181 | /** 182 | * Recreate the physics world. Will traverse all views in the hierarchy, get their current 183 | * PhysicsConfigs and create a body in the world. This will override the current world if it exists. 184 | */ 185 | fun createWorld(onBodyCreatedListener : (Body, Int) -> Unit) { 186 | // Null out all the bodies 187 | val oldBodiesArray = ArrayList() 188 | for (i in 0 until composableGroup.childCount) { 189 | val body = composableGroup.getChildAt(i).body 190 | oldBodiesArray.add(body) 191 | composableGroup.getChildAt(i).body = null 192 | } 193 | bounds.clear() 194 | if (debugLog) { 195 | Log.d(TAG, "createWorld") 196 | } 197 | world = World(Vec2(gravityX, gravityY)).apply { 198 | setContactListener(contactListener) 199 | } 200 | if (hasBounds) { 201 | enableBounds() 202 | } 203 | for (i in 0 until composableGroup.childCount) { 204 | val body = createBody(composableGroup.getChildAt(i), oldBodiesArray[i]) 205 | onBodyCreatedListener(body, i) 206 | } 207 | } 208 | 209 | private fun enableBounds() { 210 | hasBounds = true 211 | createBounds() 212 | } 213 | 214 | private fun disableBounds() { 215 | hasBounds = false 216 | for (body in bounds) { 217 | world?.destroyBody(body.body) 218 | } 219 | bounds.clear() 220 | } 221 | 222 | private fun createBounds() { 223 | val top = createBound( 224 | widthInPixels = width.toFloat(), 225 | heightInPixels = boundsSizeInPixel, 226 | id = ID_BOUND_TOP, 227 | side = Bound.Side.TOP 228 | ) 229 | bounds.add(top) 230 | 231 | val bottom = createBound( 232 | widthInPixels = width.toFloat(), 233 | heightInPixels = boundsSizeInPixel, 234 | id = ID_BOUND_BOTTOM, 235 | side = Bound.Side.BOTTOM 236 | ) 237 | bounds.add(bottom) 238 | 239 | val left = createBound( 240 | widthInPixels = boundsSizeInPixel, 241 | heightInPixels = height.toFloat(), 242 | id = ID_BOUND_LEFT, 243 | side = Bound.Side.LEFT 244 | ) 245 | bounds.add(left) 246 | 247 | val right = createBound( 248 | widthInPixels = boundsSizeInPixel, 249 | heightInPixels = height.toFloat(), 250 | id = ID_BOUND_RIGHT, 251 | side = Bound.Side.RIGHT 252 | ) 253 | bounds.add(right) 254 | } 255 | 256 | private fun createBound(widthInPixels: Float, heightInPixels: Float, id: Int, side: Bound.Side): Bound { 257 | val bodyDef = BodyDef() 258 | bodyDef.type = BodyType.STATIC 259 | val box = PolygonShape() 260 | val boxWidthMeters = pixelsToMeters(widthInPixels) 261 | val boxHeightMeters = pixelsToMeters(heightInPixels) 262 | box.setAsBox(boxWidthMeters / 2, boxHeightMeters / 2) 263 | val fixtureDef = createBoundFixtureDef(box, id) 264 | val pair = when (side) { 265 | Bound.Side.TOP -> Pair(boxWidthMeters / 2, boxHeightMeters / 2) 266 | Bound.Side.BOTTOM -> Pair(boxWidthMeters / 2, pixelsToMeters(height.toFloat()) - boxHeightMeters / 2) 267 | Bound.Side.LEFT -> Pair(boxWidthMeters / 2, pixelsToMeters(height.toFloat()) / 2) 268 | Bound.Side.RIGHT -> Pair(pixelsToMeters(width.toFloat()) - boxWidthMeters / 2, pixelsToMeters(height.toFloat()) / 2) 269 | } 270 | bodyDef.position = Vec2(pair.first, pair.second) 271 | val body = world!!.createBody(bodyDef) 272 | body.createFixture(fixtureDef) 273 | return Bound( 274 | widthInPixels = widthInPixels, 275 | heightInPixels = heightInPixels, 276 | body = body, 277 | side = side 278 | ) 279 | } 280 | 281 | private fun createBoundFixtureDef(box: PolygonShape, id: Int): FixtureDef { 282 | val fixtureDef = FixtureDef() 283 | fixtureDef.shape = box 284 | fixtureDef.density = 0.5f 285 | fixtureDef.friction = 0.3f 286 | fixtureDef.restitution = 0.5f 287 | fixtureDef.userData = id 288 | return fixtureDef 289 | } 290 | 291 | private fun createBody(physicsParentData: PhysicsParentData, oldBody: Body?): Body { 292 | val config = physicsParentData.physicsConfig 293 | val bodyDef = config.bodyDef 294 | bodyDef.position[pixelsToMeters(physicsParentData.initialX + physicsParentData.width / 2)] = pixelsToMeters(physicsParentData.initialY + physicsParentData.height / 2) 295 | 296 | // Log.d(TAG, "createBody: position: ${bodyDef.position}") 297 | 298 | if (oldBody != null) { 299 | bodyDef.angle = oldBody.angle 300 | bodyDef.angularVelocity = oldBody.angularVelocity 301 | bodyDef.linearVelocity = oldBody.linearVelocity 302 | bodyDef.angularDamping = oldBody.angularDamping 303 | bodyDef.linearDamping = oldBody.linearDamping 304 | } else { 305 | bodyDef.angularVelocity = degreesToRadians(physicsParentData.rotation) 306 | } 307 | val fixtureDef = config.fixtureDef 308 | fixtureDef.shape = if (config.shape == PhysicsShape.RECTANGLE) createBoxShape(physicsParentData) else createCircleShape(physicsParentData, config) 309 | fixtureDef.userData = physicsParentData.id 310 | val body = world!!.createBody(bodyDef) 311 | body.createFixture(fixtureDef) 312 | physicsParentData.body = body 313 | return body 314 | } 315 | 316 | private fun createBoxShape(physicsParentData: PhysicsParentData): PolygonShape { 317 | val box = PolygonShape() 318 | val boxWidth = pixelsToMeters(physicsParentData.width / 2.toFloat()) 319 | val boxHeight = pixelsToMeters(physicsParentData.height / 2.toFloat()) 320 | box.setAsBox(boxWidth, boxHeight) 321 | return box 322 | } 323 | 324 | private fun createCircleShape(physicsParentData: PhysicsParentData, config: PhysicsConfig): CircleShape { 325 | val circle = CircleShape() 326 | //radius was not set, set it to max of the width and height 327 | if (config.radius == -1f) { 328 | config.radius = max(physicsParentData.width / 2f, physicsParentData.height / 2f) 329 | } 330 | circle.m_radius = pixelsToMeters(config.radius) 331 | return circle 332 | } 333 | 334 | /** 335 | * Gives a random impulse to all the view bodies in the layout. Really just useful for testing, 336 | * but try it out if you want :) 337 | */ 338 | fun giveRandomImpulse() { 339 | var body: Body? 340 | var impulse: Vec2 341 | val random = Random() 342 | for (i in 0 until composableGroup.childCount) { 343 | impulse = Vec2((random.nextInt(1000) - 1000).toFloat(), (random.nextInt(1000) - 1000).toFloat()) 344 | body = composableGroup.getChildAt(i).body 345 | // Log.d(TAG, "giveRandomImpulse: pody's position : ${body?.position}") 346 | body?.applyLinearImpulse(impulse, body.position) 347 | } 348 | } 349 | 350 | private fun translateBodyToView(body: Body, view: View) { 351 | body.setTransform( 352 | Vec2(pixelsToMeters(view.x + view.width / 2), 353 | pixelsToMeters(view.y + view.height / 2)), 354 | body.angle) 355 | } 356 | 357 | /** 358 | * Sets the fling listener 359 | * 360 | * @param onFlingListener listener that will respond to fling events 361 | */ 362 | fun setOnFlingListener(onFlingListener: OnFlingListener?) { 363 | this.onFlingListener = onFlingListener 364 | } 365 | 366 | /** 367 | * Sets the collision listener 368 | * 369 | * @param onCollisionListener listener that will listen for collisions 370 | */ 371 | fun setOnCollisionListener(onCollisionListener: OnCollisionListener?) { 372 | this.onCollisionListener = onCollisionListener 373 | } 374 | 375 | /** 376 | * Sets the size of the bounds and enables the bounds 377 | * 378 | * @param size the size of the bounds in dp 379 | */ 380 | fun setBoundsSize(size: Float) { 381 | boundsSizeInPixel = size * density 382 | if (hasBounds) { 383 | disableBounds() 384 | } 385 | enableBounds() 386 | } 387 | 388 | /** 389 | * Sets the gravity in the x direction for the world. Positive is right, negative is left. 390 | */ 391 | fun setGravityX(newGravityX: Float) { 392 | setGravity(newGravityX, gravityY) 393 | } 394 | 395 | /** 396 | * The gravity in the x direction for the world. Positive is right, negative is left. 397 | */ 398 | fun getGravityX(): Float { 399 | return gravityX 400 | } 401 | 402 | /** 403 | * Sets the gravity in the y direction for the world. Positive is down, negative is up. 404 | */ 405 | fun setGravityY(newGravityY: Float) { 406 | setGravity(gravityX, newGravityY) 407 | } 408 | 409 | /** 410 | * The gravity in the x direction for the world. Positive is right, negative is left. 411 | */ 412 | fun getGravityY(): Float { 413 | return gravityY 414 | } 415 | 416 | /** 417 | * Sets the gravity for the world. Positive x is right, negative is left. Positive 418 | * y is down, negative is up. 419 | */ 420 | fun setGravity(gravityX: Float, gravityY: Float) { 421 | this.gravityX = gravityX 422 | this.gravityY = gravityY 423 | world?.gravity = Vec2(gravityX, gravityY) 424 | } 425 | 426 | /** 427 | * Returns the gravity of the world. Returns null if the world doesn't exist yet (view hasn't 428 | * called onLayout) 429 | */ 430 | fun getGravity(): Vec2? { 431 | return world?.gravity 432 | } 433 | 434 | /** 435 | * Add a physics process listener 436 | */ 437 | fun addOnPhysicsProcessedListener(listener: OnPhysicsProcessedListener) { 438 | onPhysicsProcessedListeners.add(listener) 439 | } 440 | 441 | /** 442 | * Remove a physics process listener 443 | */ 444 | fun removeOnPhysicsProcessedListener(listener: OnPhysicsProcessedListener?) { 445 | onPhysicsProcessedListeners.remove(listener) 446 | } 447 | 448 | /** 449 | * Interface that allows hooks into the layout so that you can process or modify physics bodies each time that JBox2D processes physics 450 | */ 451 | interface OnPhysicsProcessedListener { 452 | 453 | /** 454 | * Physics has been processed. Commence doing things that you want to do such as applying additional forces 455 | * @param physics the [Physics] that belongs to the view 456 | * @param world the Box2d world 457 | */ 458 | fun onPhysicsProcessed(physics: Physics, world: World) 459 | } 460 | 461 | /** 462 | * A controller that will receive the drag events. 463 | */ 464 | interface OnFlingListener { 465 | fun onGrabbed(grabbedView: View?) 466 | fun onReleased(releasedView: View?) 467 | } 468 | 469 | /** 470 | * Alerts you to collisions between views within the layout 471 | */ 472 | interface OnCollisionListener { 473 | /** 474 | * Called when a collision is entered between two bodies. ViewId can also be 475 | * R.id.physics_layout_bound_top, 476 | * R.id.physics_layout_bound_bottom, R.id.physics_layout_bound_left, or 477 | * R.id.physics_layout_bound_right. 478 | * If view was not assigned an id, the return value will be [View.NO_ID]. 479 | * 480 | * @param viewIdA view id of body A 481 | * @param viewIdB view id of body B 482 | */ 483 | fun onCollisionEntered(viewIdA: Int, viewIdB: Int) 484 | 485 | /** 486 | * Called when a collision is exited between two bodies. ViewId can also be 487 | * R.id.physics_layout_bound_top, 488 | * R.id.physics_layout_bound_bottom, R.id.physics_layout_bound_left, or 489 | * R.id.physics_layout_bound_right. 490 | * If view was not assigned an id, the return value will be [View.NO_ID]. 491 | * 492 | * @param viewIdA view id of body A 493 | * @param viewIdB view id of body B 494 | */ 495 | fun onCollisionExited(viewIdA: Int, viewIdB: Int) 496 | } 497 | } 498 | -------------------------------------------------------------------------------- /physics/src/main/java/com/funny/compose/physics/PhysicsConfig.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physics 2 | 3 | import org.jbox2d.dynamics.BodyDef 4 | import org.jbox2d.dynamics.BodyType 5 | import org.jbox2d.dynamics.FixtureDef 6 | 7 | enum class PhysicsShape { 8 | RECTANGLE, 9 | CIRCLE 10 | } 11 | 12 | /** 13 | * Configuration used when creating the [org.jbox2d.dynamics.Body] for each of the views in the view group 14 | */ 15 | data class PhysicsConfig( 16 | /** 17 | * The shape of the physics body, either rectangle or circle. This changes how the body will 18 | * collide with other bodies. 19 | */ 20 | var shape: PhysicsShape = PhysicsShape.RECTANGLE, 21 | /** 22 | * The fixture definition. Leave alone if you want the defaults. Learn more: [FixtureDef] 23 | */ 24 | var fixtureDef: FixtureDef = createDefaultFixtureDef(), 25 | /** 26 | * The body definition. Leave alone if you want the defaults. Learn more: [BodyDef] 27 | */ 28 | var bodyDef: BodyDef = createDefaultBodyDef() 29 | ) { 30 | 31 | /** 32 | * Only used if shape == CIRCLE, otherwise it is ignored. The radius of the circle in pixels. 33 | * Will be processed and set by its view size. 34 | */ 35 | internal var radius: Float = -1f 36 | 37 | companion object { 38 | 39 | fun createDefaultFixtureDef(): FixtureDef { 40 | val fixtureDef = FixtureDef() 41 | fixtureDef.friction = 0.3f 42 | fixtureDef.restitution = 0.2f 43 | fixtureDef.density = 0.2f 44 | return fixtureDef 45 | } 46 | 47 | fun createDefaultBodyDef(): BodyDef { 48 | val bodyDef = BodyDef() 49 | bodyDef.type = BodyType.DYNAMIC //movable by default 50 | return bodyDef 51 | } 52 | } 53 | } 54 | -------------------------------------------------------------------------------- /physics/src/main/java/com/funny/compose/physics/PhysicsLayout.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physics 2 | 3 | import android.util.Log 4 | import androidx.compose.runtime.* 5 | import androidx.compose.ui.Modifier 6 | import androidx.compose.ui.draw.drawWithContent 7 | import androidx.compose.ui.geometry.Offset 8 | import androidx.compose.ui.geometry.Size 9 | import androidx.compose.ui.graphics.Color 10 | import androidx.compose.ui.layout.Layout 11 | import androidx.compose.ui.layout.Placeable 12 | import androidx.compose.ui.platform.LocalDensity 13 | import androidx.compose.ui.unit.IntOffset 14 | import androidx.compose.ui.unit.dp 15 | import kotlinx.coroutines.delay 16 | import org.jbox2d.common.Vec2 17 | 18 | private const val TAG = "PhysicsLayout" 19 | 20 | interface PhysicsLayoutScope { 21 | @Stable 22 | fun Modifier.physics(physicsConfig: PhysicsConfig, initialX : Float = 0f, initialY : Float = 0f) : Modifier 23 | } 24 | 25 | internal object PhysicsLayoutScopeInstance : PhysicsLayoutScope { 26 | @Stable 27 | override fun Modifier.physics( 28 | physicsConfig: PhysicsConfig, 29 | initialX: Float, 30 | initialY: Float 31 | ): Modifier = this.then(PhysicsParentData(physicsConfig, initialX, initialY)) 32 | } 33 | 34 | 35 | @Composable 36 | fun PhysicsLayout( 37 | modifier: Modifier = Modifier, 38 | physicsLayoutState: PhysicsLayoutState = remember { PhysicsLayoutState() }, 39 | boundColor: Color? = Color(121, 85, 72), 40 | boundSize : Float? = 20f, 41 | giveInitialRandomImpulse : Boolean = true, 42 | content : @Composable PhysicsLayoutScope.()->Unit 43 | ){ 44 | val parentDataList = physicsLayoutState.physics.composableGroup.physicsParentDatas 45 | val physics = physicsLayoutState.physics 46 | val density = LocalDensity.current 47 | var initialized by remember { 48 | mutableStateOf(false) 49 | } 50 | 51 | LaunchedEffect(key1 = density){ 52 | physics.density = density.density 53 | physics.pixelsPerMeter = with(density){ 54 | 10.dp.toPx() 55 | } 56 | } 57 | 58 | var recompose by remember { 59 | mutableStateOf(0) 60 | } 61 | 62 | // 初始化世界 63 | LaunchedEffect(initialized){ 64 | Log.d(TAG, "PhysicsLayout: launchedEffect ${parentDataList.size} ${physics.width}") 65 | if (!initialized) return@LaunchedEffect 66 | if (parentDataList.isEmpty()) return@LaunchedEffect 67 | if (physics.width * physics.height == 0) return@LaunchedEffect 68 | physics.createWorld { body, i -> 69 | parentDataList[i].body = body 70 | // Log.d(TAG, "PhysicsLayout: createBody: $body") 71 | } 72 | if(giveInitialRandomImpulse) physics.giveRandomImpulse() 73 | } 74 | 75 | LaunchedEffect(key1 = boundSize){ 76 | if (boundSize != null && boundSize > 0){ 77 | physics.setBoundsSize(boundSize) 78 | } 79 | } 80 | 81 | LaunchedEffect(key1 = Unit){ 82 | while (true){ 83 | delay(16) 84 | physics.step() // 模拟 16ms 85 | recompose++ 86 | } 87 | } 88 | 89 | val drawBoundModifier = 90 | Modifier.drawWithContent { 91 | if (physics.hasBounds && boundColor != null && boundSize != null && boundSize > 0){ 92 | if(physics.density <= 0) return@drawWithContent 93 | // 绘制 bound 94 | val s = boundSize * physics.density 95 | val w = physics.width.toFloat() 96 | val h = physics.height.toFloat() 97 | drawRect(boundColor, Offset.Zero, Size(w,s)) 98 | drawRect(boundColor, Offset(0f, h-s), Size(w,s)) 99 | drawRect(boundColor, Offset(0f, s), Size(s, h - 2 * s)) 100 | drawRect(boundColor, Offset(w - s, s), Size(s, h - 2 * s)) 101 | } 102 | drawContent() 103 | } 104 | 105 | Layout(content = { PhysicsLayoutScopeInstance.content() }, modifier = modifier.then(drawBoundModifier)){ measurables, constraints -> 106 | if (!initialized) { 107 | physics.setSize(constraints.maxWidth, constraints.maxHeight) 108 | } 109 | 110 | val childConstraints = constraints.copy(minWidth = 0, minHeight = 0) 111 | val placeables = measurables.mapIndexed { index, measurable -> 112 | val physicsParentData = (measurable.parentData as? PhysicsParentData) ?: PhysicsParentData() 113 | // Log.d(TAG, "PhysicsLayout: init : $initialized") 114 | if (!initialized){ 115 | parentDataList.add(index, physicsParentData) 116 | // Log.d(TAG, "PhysicsLayout: addParentData: (${physicsParentData.initialX}, ${physicsParentData.initialY})") 117 | } 118 | measurable.measure(childConstraints) 119 | } 120 | 121 | layout(constraints.maxWidth, constraints.maxHeight){ 122 | placeables.forEachIndexed { i, placeable: Placeable -> 123 | // 正确设置各body大小 124 | parentDataList[i].width = placeable.width 125 | parentDataList[i].height = placeable.height 126 | 127 | val x = physics.metersToPixels(parentDataList[i].x).toInt() - placeable.width / 2 128 | val y = physics.metersToPixels(parentDataList[i].y).toInt() - placeable.height / 2 129 | 130 | val c = recompose // 这行代码什么用也没有，目的是触发重新 Layout 131 | 132 | // Log.d(TAG, "PhysicsLayout: $i -> x : $x y : $y") 133 | // Log.d(TAG, "PhysicsLayout: $recompose") 134 | // placeable.place(x, y) 135 | placeable.placeWithLayer(IntOffset(x,y), zIndex = 0f, layerBlock = { 136 | rotationZ = parentDataList[i].rotation 137 | }) 138 | } 139 | }.also { 140 | // 各类初始化只进行一次即可 141 | if (!initialized) { 142 | initialized = true 143 | } 144 | } 145 | } 146 | } -------------------------------------------------------------------------------- /physics/src/main/java/com/funny/compose/physics/PhysicsLayoutState.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physics 2 | 3 | import org.jbox2d.common.Vec2 4 | 5 | data class PhysicsLayoutState(val physics: Physics = Physics(ComposableGroup(arrayListOf()))){ 6 | /** 7 | * 设置重力 8 | * @param x Float x方向，默认0 9 | * @param y Float y方向，默认9.8 10 | */ 11 | fun setGravity(x:Float = 0f, y:Float = 9.8f){ 12 | physics.world?.gravity = Vec2(x,y) 13 | } 14 | 15 | /** 16 | * 给所有物体一个随机冲量 17 | */ 18 | fun giveRandomImpulse(){ 19 | physics.giveRandomImpulse() 20 | } 21 | } -------------------------------------------------------------------------------- /physics/src/main/java/com/funny/compose/physics/PhysicsParentData.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physics 2 | 3 | import androidx.compose.ui.layout.ParentDataModifier 4 | import androidx.compose.ui.unit.Density 5 | import org.jbox2d.dynamics.Body 6 | 7 | class PhysicsParentData( 8 | var physicsConfig: PhysicsConfig = PhysicsConfig(), 9 | var initialX: Float = 0f, 10 | var initialY: Float = 0f, 11 | var width: Int = 0, 12 | var height: Int = 0 13 | ) : ParentDataModifier { 14 | override fun Density.modifyParentData(parentData: Any?): Any = this@PhysicsParentData 15 | 16 | var body : Body? = null 17 | 18 | val rotation 19 | get() = body?.angle?.times(180f)?.div(Math.PI)?.toFloat() ?: 0f 20 | 21 | val id = hashCode() 22 | val x : Float 23 | get() = body?.position?.x ?: 0f 24 | val y : Float 25 | get() = body?.position?.y ?: 0f 26 | 27 | } -------------------------------------------------------------------------------- /physics/src/test/java/com/funny/compose/physics/ExampleUnitTest.kt: -------------------------------------------------------------------------------- 1 | package com.funny.compose.physics 2 | 3 | import org.junit.Test 4 | 5 | import org.junit.Assert.* 6 | 7 | /** 8 | * Example local unit test, which will execute on the development machine (host). 9 | * 10 | * See [testing documentation](http://d.android.com/tools/testing). 11 | */ 12 | class ExampleUnitTest { 13 | @Test 14 | fun addition_isCorrect() { 15 | assertEquals(4, 2 + 2) 16 | } 17 | } -------------------------------------------------------------------------------- /screen_shot.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/FunnySaltyFish/JetpackComposePhysicsLayout/f29d1d475dfb2885818ed9141ea41027bee5480e/screen_shot.gif -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | pluginManagement { 2 | repositories { 3 | gradlePluginPortal() 4 | google() 5 | mavenCentral() 6 | } 7 | } 8 | dependencyResolutionManagement { 9 | repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS) 10 | repositories { 11 | maven { url 'https://maven.aliyun.com/repository/public/' } 12 | maven { url 'https://maven.aliyun.com/repository/google/'} 13 | maven { url 'https://maven.aliyun.com/repository/jcenter/'} 14 | maven { url "https://jitpack.io" } 15 | google() 16 | mavenCentral() 17 | } 18 | } 19 | rootProject.name = "JetpackComposePhysicsLayout" 20 | include ':app' 21 | include ':physics' 22 | --------------------------------------------------------------------------------