├── .gitignore
├── Math.sln
├── Math.vcxproj
├── Math.vcxproj.filters
├── README.md
├── addons.make
├── bin
├── data
│ └── .gitkeep
└── imgui.ini
├── demo.gif
├── icon.rc
└── src
├── main.cpp
├── ofApp.cpp
└── ofApp.h
/.gitignore:
--------------------------------------------------------------------------------
1 | # Mac OS X cruft
2 | *.pbxuser
3 | *.mode1v3
4 | *.mode2v3
5 | *.user
6 | project.xcworkspace
7 | xcuserdata/
8 | *.xccheckout
9 | .DS_Store
10 |
11 | # Windows cruft
12 | *.suo
13 | *.ncb
14 | *.sdf
15 | *.VC.opendb
16 | *.VC.db
17 | *.opensdf
18 | Debug/
19 | Release/
20 | Debug_ANGLE/
21 | Release_ANGLE/
22 | ipch/
23 |
24 | # doxygen generated files
25 | docs/html
26 | docs/xml
27 | docs/doxygen/cinder.tag
28 | docs/*/node_modules
29 | *.pyc
30 |
31 |
32 | *.exe
33 | *.exp
34 | *.ilk
35 | *.lib
36 | *.pdb
37 |
38 | FreeImage.dll
39 | Zlib.dll
40 | assimp.dll
41 | fmodex.dll
42 | fmodexL.dll
43 | freetype.dll
44 | glut32.dll
45 | libeay32.dll
46 | ssleay32.dll
--------------------------------------------------------------------------------
/Math.sln:
--------------------------------------------------------------------------------
1 | Microsoft Visual Studio Solution File, Format Version 12.00
2 | # Visual Studio 14
3 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Math", "Math.vcxproj", "{7FD42DF7-442E-479A-BA76-D0022F99702A}"
4 | EndProject
5 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "openframeworksLib", "..\..\..\libs\openFrameworksCompiled\project\vs\openframeworksLib.vcxproj", "{5837595D-ACA9-485C-8E76-729040CE4B0B}"
6 | EndProject
7 | Global
8 | GlobalSection(SolutionConfigurationPlatforms) = preSolution
9 | Debug|Win32 = Debug|Win32
10 | Debug|x64 = Debug|x64
11 | Release|Win32 = Release|Win32
12 | Release|x64 = Release|x64
13 | EndGlobalSection
14 | GlobalSection(ProjectConfigurationPlatforms) = postSolution
15 | {7FD42DF7-442E-479A-BA76-D0022F99702A}.Debug|Win32.ActiveCfg = Debug|Win32
16 | {7FD42DF7-442E-479A-BA76-D0022F99702A}.Debug|Win32.Build.0 = Debug|Win32
17 | {7FD42DF7-442E-479A-BA76-D0022F99702A}.Debug|x64.ActiveCfg = Debug|x64
18 | {7FD42DF7-442E-479A-BA76-D0022F99702A}.Debug|x64.Build.0 = Debug|x64
19 | {7FD42DF7-442E-479A-BA76-D0022F99702A}.Release|Win32.ActiveCfg = Release|Win32
20 | {7FD42DF7-442E-479A-BA76-D0022F99702A}.Release|Win32.Build.0 = Release|Win32
21 | {7FD42DF7-442E-479A-BA76-D0022F99702A}.Release|x64.ActiveCfg = Release|x64
22 | {7FD42DF7-442E-479A-BA76-D0022F99702A}.Release|x64.Build.0 = Release|x64
23 | {5837595D-ACA9-485C-8E76-729040CE4B0B}.Debug|Win32.ActiveCfg = Debug|Win32
24 | {5837595D-ACA9-485C-8E76-729040CE4B0B}.Debug|Win32.Build.0 = Debug|Win32
25 | {5837595D-ACA9-485C-8E76-729040CE4B0B}.Debug|x64.ActiveCfg = Debug|x64
26 | {5837595D-ACA9-485C-8E76-729040CE4B0B}.Debug|x64.Build.0 = Debug|x64
27 | {5837595D-ACA9-485C-8E76-729040CE4B0B}.Release|Win32.ActiveCfg = Release|Win32
28 | {5837595D-ACA9-485C-8E76-729040CE4B0B}.Release|Win32.Build.0 = Release|Win32
29 | {5837595D-ACA9-485C-8E76-729040CE4B0B}.Release|x64.ActiveCfg = Release|x64
30 | {5837595D-ACA9-485C-8E76-729040CE4B0B}.Release|x64.Build.0 = Release|x64
31 | EndGlobalSection
32 | GlobalSection(SolutionProperties) = preSolution
33 | HideSolutionNode = FALSE
34 | EndGlobalSection
35 | EndGlobal
36 |
--------------------------------------------------------------------------------
/Math.vcxproj:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 | Debug
6 | Win32
7 |
8 |
9 | Debug
10 | x64
11 |
12 |
13 | Release
14 | Win32
15 |
16 |
17 | Release
18 | x64
19 |
20 |
21 |
22 | {7FD42DF7-442E-479A-BA76-D0022F99702A}
23 | Win32Proj
24 | Math
25 |
26 |
27 |
28 | Application
29 | Unicode
30 | v140
31 |
32 |
33 | Application
34 | Unicode
35 | v140
36 |
37 |
38 | Application
39 | Unicode
40 | true
41 | v140
42 |
43 |
44 | Application
45 | Unicode
46 | true
47 | v140
48 |
49 |
50 |
51 |
52 |
53 |
54 |
55 |
56 |
57 |
58 |
59 |
60 |
61 |
62 |
63 |
64 |
65 |
66 |
67 |
68 | bin\
69 | obj\$(Configuration)\
70 | $(ProjectName)_debug
71 | true
72 | true
73 |
74 |
75 | bin\
76 | obj\$(Configuration)\
77 | $(ProjectName)_debug
78 | true
79 | true
80 |
81 |
82 | bin\
83 | obj\$(Configuration)\
84 | false
85 |
86 |
87 | bin\
88 | obj\$(Configuration)\
89 | false
90 |
91 |
92 |
93 | Disabled
94 | EnableFastChecks
95 | %(PreprocessorDefinitions)
96 | MultiThreadedDebugDLL
97 | Level3
98 | %(AdditionalIncludeDirectories);..\..\..\addons\ofxImGui\libs;..\..\..\addons\ofxImGui\libs\imgui;..\..\..\addons\ofxImGui\libs\imgui\src;..\..\..\addons\ofxImGui\src;..\..\..\addons\glm
99 | CompileAsCpp
100 |
101 |
102 | true
103 | Console
104 | false
105 | %(AdditionalDependencies)
106 | %(AdditionalLibraryDirectories)
107 |
108 |
109 |
110 |
111 |
112 | Disabled
113 | EnableFastChecks
114 | %(PreprocessorDefinitions)
115 | MultiThreadedDebugDLL
116 | Level3
117 | %(AdditionalIncludeDirectories);..\..\..\addons\ofxImGui\libs;..\..\..\addons\ofxImGui\libs\imgui;..\..\..\addons\ofxImGui\libs\imgui\src;..\..\..\addons\ofxImGui\src;..\..\..\addons\glm
118 | CompileAsCpp
119 | true
120 |
121 |
122 | true
123 | Console
124 | false
125 | %(AdditionalDependencies)
126 | %(AdditionalLibraryDirectories)
127 |
128 |
129 |
130 |
131 |
132 | false
133 | %(PreprocessorDefinitions)
134 | MultiThreadedDLL
135 | Level3
136 | %(AdditionalIncludeDirectories);..\..\..\addons\ofxImGui\libs;..\..\..\addons\ofxImGui\libs\imgui;..\..\..\addons\ofxImGui\libs\imgui\src;..\..\..\addons\ofxImGui\src;..\..\..\addons\glm
137 | CompileAsCpp
138 | true
139 |
140 |
141 | false
142 | false
143 | Console
144 | true
145 | true
146 | false
147 | %(AdditionalDependencies)
148 | %(AdditionalLibraryDirectories)
149 |
150 |
151 |
152 |
153 |
154 | false
155 | %(PreprocessorDefinitions)
156 | MultiThreadedDLL
157 | Level3
158 | %(AdditionalIncludeDirectories);..\..\..\addons\ofxImGui\libs;..\..\..\addons\ofxImGui\libs\imgui;..\..\..\addons\ofxImGui\libs\imgui\src;..\..\..\addons\ofxImGui\src;..\..\..\addons\glm
159 | CompileAsCpp
160 |
161 |
162 | false
163 | false
164 | Console
165 | true
166 | true
167 | false
168 | %(AdditionalDependencies)
169 | %(AdditionalLibraryDirectories)
170 |
171 |
172 |
173 |
174 |
175 |
176 |
177 |
178 |
179 |
180 |
181 |
182 |
183 |
184 |
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187 |
188 |
189 |
190 |
191 |
192 |
193 |
194 |
195 |
196 |
197 |
198 |
199 |
200 |
201 |
202 | {5837595d-aca9-485c-8e76-729040ce4b0b}
203 |
204 |
205 |
206 |
207 | /D_DEBUG %(AdditionalOptions)
208 | /D_DEBUG %(AdditionalOptions)
209 | $(OF_ROOT)\libs\openFrameworksCompiled\project\vs
210 |
211 |
212 |
213 |
214 |
215 |
216 |
217 |
218 |
--------------------------------------------------------------------------------
/Math.vcxproj.filters:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 | src
6 |
7 |
8 | src
9 |
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11 | addons\ofxImGui\src
12 |
13 |
14 | addons\ofxImGui\src
15 |
16 |
17 | addons\ofxImGui\src
18 |
19 |
20 | addons\ofxImGui\src
21 |
22 |
23 | addons\ofxImGui\src
24 |
25 |
26 | addons\ofxImGui\libs\imgui\src
27 |
28 |
29 | addons\ofxImGui\libs\imgui\src
30 |
31 |
32 | addons\ofxImGui\libs\imgui\src
33 |
34 |
35 |
36 |
37 | {d8376475-7454-4a24-b08a-aac121d3ad6f}
38 |
39 |
40 | {71834F65-F3A9-211E-73B8-DC85}
41 |
42 |
43 | {0CD6A942-69FF-3BAA-3AF1-ADD1}
44 |
45 |
46 | {18028A43-13D3-1DD5-471A-BE87}
47 |
48 |
49 | {BE2F957E-7DA7-055C-DC70-3070}
50 |
51 |
52 | {296AD70B-2F2E-1462-9E7C-6030}
53 |
54 |
55 | {5962BF19-1468-EB82-01C0-2E72}
56 |
57 |
58 |
59 |
60 | src
61 |
62 |
63 | addons\ofxImGui\src
64 |
65 |
66 | addons\ofxImGui\src
67 |
68 |
69 | addons\ofxImGui\src
70 |
71 |
72 | addons\ofxImGui\src
73 |
74 |
75 | addons\ofxImGui\src
76 |
77 |
78 | addons\ofxImGui\src
79 |
80 |
81 | addons\ofxImGui\src
82 |
83 |
84 | addons\ofxImGui\libs\imgui\src
85 |
86 |
87 | addons\ofxImGui\libs\imgui\src
88 |
89 |
90 | addons\ofxImGui\libs\imgui\src
91 |
92 |
93 | addons\ofxImGui\libs\imgui\src
94 |
95 |
96 | addons\ofxImGui\libs\imgui\src
97 |
98 |
99 |
100 |
101 |
102 |
103 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # Math Based CoverFlow System
2 | https://www.desmos.com/calculator/xvjxzugwdn
3 |
4 | 
5 |
--------------------------------------------------------------------------------
/addons.make:
--------------------------------------------------------------------------------
1 | ofxImGui
2 |
--------------------------------------------------------------------------------
/bin/data/.gitkeep:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/Ushio/MathBasedCoverFlow/d98364b63fb54fe0225241805e17a7a7c174d7ce/bin/data/.gitkeep
--------------------------------------------------------------------------------
/bin/imgui.ini:
--------------------------------------------------------------------------------
1 | [Debug]
2 | Pos=60,60
3 | Size=400,400
4 | Collapsed=0
5 |
6 | [Config]
7 | Pos=11,16
8 | Size=349,603
9 | Collapsed=0
10 |
11 |
--------------------------------------------------------------------------------
/demo.gif:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/Ushio/MathBasedCoverFlow/d98364b63fb54fe0225241805e17a7a7c174d7ce/demo.gif
--------------------------------------------------------------------------------
/icon.rc:
--------------------------------------------------------------------------------
1 | // Icon Resource Definition
2 | #define MAIN_ICON 102
3 |
4 | #if defined(_DEBUG)
5 | MAIN_ICON ICON "icon_debug.ico"
6 | #else
7 | MAIN_ICON ICON "icon.ico"
8 | #endif
9 |
--------------------------------------------------------------------------------
/src/main.cpp:
--------------------------------------------------------------------------------
1 | #include "ofMain.h"
2 | #include "ofApp.h"
3 |
4 | //========================================================================
5 | int main( ){
6 | ofSetupOpenGL(1024,768,OF_WINDOW); // <-------- setup the GL context
7 |
8 | // this kicks off the running of my app
9 | // can be OF_WINDOW or OF_FULLSCREEN
10 | // pass in width and height too:
11 | ofRunApp(new ofApp());
12 |
13 | }
14 |
--------------------------------------------------------------------------------
/src/ofApp.cpp:
--------------------------------------------------------------------------------
1 | #include "ofApp.h"
2 |
3 | #include
4 | #include
5 |
6 | template
7 | void imgui_draw_tree_node(const char *name, bool isOpen, T f) {
8 | if (isOpen) {
9 | ImGui::SetNextTreeNodeOpen(true, ImGuiSetCond_Once);
10 | }
11 | if (ImGui::TreeNode(name)) {
12 | f();
13 | ImGui::TreePop();
14 | }
15 | }
16 |
17 | //--------------------------------------------------------------
18 | void ofApp::setup(){
19 | _camera.setDistance(20);
20 | _camera.setNearClip(0.1);
21 | _camera.setFarClip(300.0);
22 |
23 | _imgui.setup();
24 | }
25 |
26 | //--------------------------------------------------------------
27 | void ofApp::update() {
28 | double d = std::min(ofGetLastFrameTime(), 1.0 / 30.0);
29 |
30 | auto impluse = [](double x, double a) {
31 | double over_a = 1.0 / a;
32 | return over_a * x * glm::exp(1.0 - over_a * x);
33 | };
34 | auto near_more = [](double d, double s) {
35 | return glm::exp(-(d * d) / (s * s));
36 | };
37 |
38 | int N = 10;
39 | double delta = d / N;
40 | for (int i = 0; i < N; ++i) {
41 | // 差
42 | double d = _to_x - _x;
43 |
44 | // 比例制御(P)
45 | auto pv = d * _kP;
46 |
47 | // 距離の近いときの+速度
48 | auto nv = impluse(glm::abs(d), 0.5) * _approach;
49 | if (pv < 0.0) {
50 | nv = -nv;
51 | }
52 |
53 | auto v = pv + nv;
54 |
55 | // 速度制限
56 | v = std::min(v, (double)_vMax);
57 | v = std::max(v, (double)-_vMax);
58 |
59 | // 加速だけ制限をかけたい
60 | if (glm::abs(_v) < glm::abs(v)) {
61 | auto amax = _aMax * delta;
62 | double a = v - _v;
63 | a = std::min(a, amax);
64 | a = std::max(a, -amax);
65 | v = _v + a;
66 | }
67 |
68 | _v = v;
69 | _x += _v * delta;
70 | }
71 |
72 | }
73 |
74 | //--------------------------------------------------------------
75 | void ofApp::draw(){
76 | ofClear(0);
77 |
78 | ofSetColor(255);
79 | _camera.begin();
80 |
81 | glPushMatrix();
82 | ofRotateZ(90);
83 | ofDrawGridPlane(1, 10);
84 | ofPopMatrix();
85 |
86 | ofDrawAxis(10);
87 |
88 | ofEnableDepthTest();
89 |
90 | // 位置場
91 | // Integrate[t + w*exp(-(x^2)/s^2), {x, 0, z}]
92 | auto position_field = [](double z, double s, double t, double w) {
93 | return 0.5 * glm::sqrt(glm::pi()) * s * w * std::erf(z / s) + t * z;
94 | };
95 |
96 | // 回転場
97 | auto rotation_field = [](double z, double s) {
98 | auto v = glm::exp(-(z * z) / (s * s)) - 1.0;
99 | return 0.0 < z ? v : -v;
100 | };
101 |
102 | // ズーム場
103 | auto zoom_field = [](double z, double s) {
104 | return glm::exp(-(z * z) / (s * s));
105 | };
106 |
107 | // 奥に並ぶようなやつ
108 | // Integrate[erf(u*sqrt(pi) x), {x, 0, z}]
109 | //auto zf = [](double z, double u) {
110 | // double sqPI = glm::sqrt(glm::pi());
111 | // double a = -glm::pi() * u * z * std::erf(sqPI * u * z) - glm::exp(-glm::pi() * u * u * z * z) + 1.0;
112 | // double b = glm::pi() * u;
113 | // return -a / b;
114 | //};
115 |
116 | double step = 1.0;
117 |
118 | // double ofs = -(glm::sin(ofGetElapsedTimef() * 0.5) * 0.5 + 0.5) * 5.0;
119 | for (int i = 0; i < kSlideN; ++i) {
120 | double x = i * step - _x;
121 | double position = position_field(x, _positionRoughness, _edgeSlope, _centerArea);
122 | double rot = rotation_field(x, _rotationArea);
123 | double zoomValue = zoom_field(x, _zoomArea);
124 | // double ofz = - 1.0 * zf(x, 2.0);
125 |
126 | ofSetColor(i % 2 == 0 ? 128 : 200);
127 | ofPushMatrix();
128 | ofTranslate(position, 0, zoomValue * _zoom);
129 | ofRotateY(rot * _rotation);
130 |
131 | // 縦
132 | ofDrawRectangle(-0.5, -0.5, 1.0f, 1.0f);
133 | ofPopMatrix();
134 | }
135 |
136 | // テスト描画
137 | //ofSetColor(ofColor::red);
138 | //ofDrawSphere(_x, 1.0f, 0.5f);
139 | //ofSetColor(ofColor::green);
140 | //ofDrawSphere(_to_x, 1.0f, 0.4f);
141 |
142 | _camera.end();
143 |
144 | _imgui.begin();
145 | ImGui::PushStyleColor(ImGuiCol_WindowBg, ofVec4f(0.0f, 0.2f, 0.2f, 0.8f));
146 | ImGui::SetNextWindowPos(ofVec2f(10, 30), ImGuiSetCond_Once);
147 | ImGui::SetNextWindowSize(ofVec2f(500, ofGetHeight() * 0.8), ImGuiSetCond_Once);
148 |
149 | ImGui::Begin("Config");
150 |
151 | imgui_draw_tree_node("Cover Flow", true, [=]() {
152 | // 両端の間隔
153 | ImGui::SliderFloat("edgeSlope", &_edgeSlope, 0.0f, 1.0f);
154 |
155 | // 真ん中エリアの幅
156 | ImGui::SliderFloat("positionRoughness", &_positionRoughness, 0.0f, 4.0f);
157 |
158 | // 真ん中エリアの幅拡張
159 | ImGui::SliderFloat("centerArea", &_centerArea, 0.0f, 10.0f);
160 |
161 | // 回転エリアの幅
162 | ImGui::SliderFloat("rotationArea", &_rotationArea, 0.0f, 4.0f);
163 |
164 | // 回転量
165 | ImGui::SliderFloat("rotation", &_rotation, 0.0f, 90.0f);
166 |
167 | // z方向ズーム幅
168 | ImGui::SliderFloat("zoomArea", &_zoomArea, 0.0f, 4.0f);
169 |
170 | // z方向ズーム量
171 | ImGui::SliderFloat("zoom", &_zoom, 0.0f, 2.0f);
172 | });
173 |
174 |
175 | imgui_draw_tree_node("Movement", true, [=]() {
176 | // 差に比例する量 = ベース速度を決める
177 | ImGui::SliderFloat("kP", &_kP, 0.0f, 10.0f);
178 |
179 | // 最大速度制限
180 | ImGui::SliderFloat("vMax", &_vMax, 0.0f, 30.0f);
181 |
182 | // 最大加速度制限（上り）
183 | ImGui::SliderFloat("aMax", &_aMax, 0.0f, 200.0f);
184 |
185 | // 距離が近いときの追加加速具合制御 - 通常の比例制御だと減速が激しいため
186 | ImGui::SliderFloat("approach", &_approach, 0.0f, 5.0f);
187 |
188 | // 距離が近いときの追加加速を行う幅。おおむね0.5でいい気がする
189 | ImGui::SliderFloat("approachWide", &_approachWide, 0.0f, 5.0f);
190 |
191 | ImGui::Separator();
192 |
193 | // テスト用直接編集
194 | ImGui::SliderInt("selection", &_to_x, 0, kSlideN - 1);
195 | });
196 |
197 | ImGui::End();
198 | ImGui::PopStyleColor();
199 |
200 | _imgui.end();
201 | }
202 |
203 | //--------------------------------------------------------------
204 | void ofApp::keyPressed(int key){
205 | if (key == OF_KEY_RIGHT) {
206 | _to_x += 1;
207 | }
208 | if (key == OF_KEY_LEFT) {
209 | _to_x -= 1;
210 | }
211 |
212 | _to_x = std::min(_to_x, kSlideN - 1);
213 | _to_x = std::max(_to_x, 0);
214 | }
215 |
216 | //--------------------------------------------------------------
217 | void ofApp::keyReleased(int key){
218 |
219 | }
220 |
221 | //--------------------------------------------------------------
222 | void ofApp::mouseMoved(int x, int y ){
223 |
224 | }
225 |
226 | //--------------------------------------------------------------
227 | void ofApp::mouseDragged(int x, int y, int button){
228 |
229 | }
230 |
231 | //--------------------------------------------------------------
232 | void ofApp::mousePressed(int x, int y, int button){
233 |
234 | }
235 |
236 | //--------------------------------------------------------------
237 | void ofApp::mouseReleased(int x, int y, int button){
238 |
239 | }
240 |
241 | //--------------------------------------------------------------
242 | void ofApp::mouseEntered(int x, int y){
243 |
244 | }
245 |
246 | //--------------------------------------------------------------
247 | void ofApp::mouseExited(int x, int y){
248 |
249 | }
250 |
251 | //--------------------------------------------------------------
252 | void ofApp::windowResized(int w, int h){
253 |
254 | }
255 |
256 | //--------------------------------------------------------------
257 | void ofApp::gotMessage(ofMessage msg){
258 |
259 | }
260 |
261 | //--------------------------------------------------------------
262 | void ofApp::dragEvent(ofDragInfo dragInfo){
263 |
264 | }
265 |
--------------------------------------------------------------------------------
/src/ofApp.h:
--------------------------------------------------------------------------------
1 | #pragma once
2 |
3 | #include "ofMain.h"
4 | #include "ofxImGui.h"
5 |
6 | static int kSlideN = 15;
7 |
8 | class ofApp : public ofBaseApp{
9 |
10 | public:
11 | void setup();
12 | void update();
13 | void draw();
14 |
15 | void keyPressed(int key);
16 | void keyReleased(int key);
17 | void mouseMoved(int x, int y );
18 | void mouseDragged(int x, int y, int button);
19 | void mousePressed(int x, int y, int button);
20 | void mouseReleased(int x, int y, int button);
21 | void mouseEntered(int x, int y);
22 | void mouseExited(int x, int y);
23 | void windowResized(int w, int h);
24 | void dragEvent(ofDragInfo dragInfo);
25 | void gotMessage(ofMessage msg);
26 |
27 | ofEasyCam _camera;
28 | ofxImGui _imgui;
29 |
30 | // coverflow
31 | float _edgeSlope = 0.3;
32 | float _positionRoughness = 0.7;
33 | float _centerArea = 1.1;
34 | float _rotationArea = 0.7;
35 | float _rotation = 70.0;
36 | float _zoomArea = 0.7;
37 | float _zoom = 0.5;
38 |
39 | // move
40 | float _kP = 5.0f;
41 | float _vMax = 15.0f;
42 | float _aMax = 40.0f;
43 | float _approach = 1.0f;
44 | float _approachWide = 0.5f;
45 |
46 | // 現在座標
47 | double _x = 0.0;
48 | // 現在速度
49 | double _v = 0.0;
50 | // selection
51 | int _to_x = 0;
52 | };
53 |
--------------------------------------------------------------------------------