├── BezierWave.pro
├── BezierWave.pro.user
├── LICENSE
├── README.md
├── bezierwavebean.cpp
├── bezierwavebean.h
├── main.cpp
├── mainwindow.cpp
├── mainwindow.h
├── mainwindow.ui
└── pictures
    └── picture.gif


/BezierWave.pro:
--------------------------------------------------------------------------------
 1 | #-------------------------------------------------
 2 | #
 3 | # Project created by QtCreator 2019-05-31T12:01:22
 4 | #
 5 | #-------------------------------------------------
 6 | 
 7 | QT       += core gui
 8 | 
 9 | greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
10 | 
11 | TARGET = BezierWave
12 | TEMPLATE = app
13 | 
14 | # The following define makes your compiler emit warnings if you use
15 | # any feature of Qt which has been marked as deprecated (the exact warnings
16 | # depend on your compiler). Please consult the documentation of the
17 | # deprecated API in order to know how to port your code away from it.
18 | DEFINES += QT_DEPRECATED_WARNINGS
19 | 
20 | # You can also make your code fail to compile if you use deprecated APIs.
21 | # In order to do so, uncomment the following line.
22 | # You can also select to disable deprecated APIs only up to a certain version of Qt.
23 | #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
24 | 
25 | CONFIG += c++11
26 | 
27 | SOURCES += \
28 |         main.cpp \
29 |         mainwindow.cpp \
30 |     bezierwavebean.cpp
31 | 
32 | HEADERS += \
33 |         mainwindow.h \
34 |     bezierwavebean.h
35 | 
36 | FORMS += \
37 |         mainwindow.ui
38 | 
39 | # Default rules for deployment.
40 | qnx: target.path = /tmp/$${TARGET}/bin
41 | else: unix:!android: target.path = /opt/$${TARGET}/bin
42 | !isEmpty(target.path): INSTALLS += target
43 | 


--------------------------------------------------------------------------------
/BezierWave.pro.user:
--------------------------------------------------------------------------------
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289 |      <value type="int">1</value>
290 |      <value type="int">2</value>
291 |      <value type="int">3</value>
292 |      <value type="int">4</value>
293 |      <value type="int">5</value>
294 |      <value type="int">6</value>
295 |      <value type="int">7</value>
296 |      <value type="int">8</value>
297 |      <value type="int">9</value>
298 |      <value type="int">10</value>
299 |      <value type="int">11</value>
300 |      <value type="int">12</value>
301 |      <value type="int">13</value>
302 |      <value type="int">14</value>
303 |     </valuelist>
304 |     <value type="int" key="PE.EnvironmentAspect.Base">2</value>
305 |     <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
306 |     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">BezierWave</value>
307 |     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName"></value>
308 |     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">Qt4ProjectManager.Qt4RunConfiguration:/home/mrxy001/Qt/Bezier-Wave/BezierWave.pro</value>
309 |     <value type="QString" key="RunConfiguration.Arguments"></value>
310 |     <value type="uint" key="RunConfiguration.QmlDebugServerPort">3768</value>
311 |     <value type="bool" key="RunConfiguration.UseCppDebugger">false</value>
312 |     <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
313 |     <value type="bool" key="RunConfiguration.UseLibrarySearchPath">true</value>
314 |     <value type="bool" key="RunConfiguration.UseMultiProcess">false</value>
315 |     <value type="bool" key="RunConfiguration.UseQmlDebugger">false</value>
316 |     <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
317 |     <value type="QString" key="RunConfiguration.WorkingDirectory"></value>
318 |     <value type="QString" key="RunConfiguration.WorkingDirectory.default">/home/mrxy001/Qt/build-BezierWave-Desktop_Qt_5_13_1_GCC_64bit-Debug</value>
319 |    </valuemap>
320 |    <value type="int" key="ProjectExplorer.Target.RunConfigurationCount">1</value>
321 |   </valuemap>
322 |  </data>
323 |  <data>
324 |   <variable>ProjectExplorer.Project.TargetCount</variable>
325 |   <value type="int">1</value>
326 |  </data>
327 |  <data>
328 |   <variable>ProjectExplorer.Project.Updater.FileVersion</variable>
329 |   <value type="int">22</value>
330 |  </data>
331 |  <data>
332 |   <variable>Version</variable>
333 |   <value type="int">22</value>
334 |  </data>
335 | </qtcreator>
336 | 


--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | 贝塞尔曲线波浪
 2 | ===
 3 | 
 4 | ## 安装与运行环境
 5 | 
 6 | - 语言：C++
 7 | - 框架：Qt 11.3
 8 | - 平台：Windows
 9 | 
10 | ## 截图
11 | 
12 | ![截图](pictures/picture.gif)
13 | 
14 | ## 算法
15 | 
16 | 将屏幕水平平均分为10块，在一定范围内随机高度的12个点（左右出头），通过贝塞尔曲线连接连续的点，即可绘制成一段段连续的波浪。
17 | 
18 | 但是每两端波浪都会有折线凸起，根据贝塞尔曲线的原理，两个控制点中点作为新的控制点，原来的两点连线即为该控制点在新曲线上的切线，这样既可绘制成只由三个控制点影响的`B样条`。
19 | 
20 | 为了逼真，通过时钟以及大量状态机确定随机范围，例如在某一段时间整体偏下方，某一段时间整体偏上方，模仿大自然水面潮涨潮落。
21 | 
22 | ## 用法
23 | 
24 | 创建：
25 | 
26 | ```C++
27 | MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
28 | {
29 |     bw1 = new BezierWaveBean(this);
30 |     bw1->set_offsety(geometry().height()/20); // 垂直偏移位置【可选】
31 |     bw1->set_speedx(4); // 设置速度
32 |     bw1->start();
33 | }
34 | ```
35 | 
36 | 绘制：
37 | 
38 | ```C++
39 | void MainWindow::paintEvent(QPaintEvent *e)
40 | {
41 |     QPainter painter(this);
42 |     painter.setRenderHint(QPainter::Antialiasing, true); // 抗锯齿
43 | 
44 |     painter.fillPath(bw1->getPainterPath(painter), QColor(255, 0, 0, 50));
45 | 
46 |     return QMainWindow::paintEvent(e);
47 | }
48 | ```
49 | 
50 | 尺寸：
51 | 
52 | ```C++
53 | void MainWindow::resizeEvent(QResizeEvent *e)
54 | {
55 |     bw1->set_rect(geometry());
56 |     return QMainWindow::resizeEvent(e);
57 | }
58 | ```
59 | 
60 | 开关：
61 | 
62 | ```C++
63 | bw1->start();  // 开始
64 | bw1->pause();  // 暂停
65 | bw1->resume(); // 继续
66 | ```
67 | 
68 | 


--------------------------------------------------------------------------------
/bezierwavebean.cpp:
--------------------------------------------------------------------------------
  1 | #include "bezierwavebean.h"
  2 | 
  3 | BezierWaveBean::BezierWaveBean(QWidget* parent) : QObject(parent), target(parent), mt(rd())
  4 | {
  5 |     srand(static_cast<unsigned int>(time(nullptr)));
  6 | 
  7 |     count = 8; // 点的总数
  8 |     inter = target->geometry().width()/(count-4);
  9 |     appear_speedy = 3; // 出现时的最大速度
 10 | 
 11 | //    speedy = appear_speedy; // y移动速度
 12 |     offsety = 0; // y累计偏移
 13 |     offsety_direct = -1; // y短期偏移方向，-1上 和 1下
 14 |     speedx = 3; // x移动速度
 15 |     offsetx = 0; // x累计偏移
 16 | 
 17 |     speedy_step = 3;
 18 |     _offsety = 0;
 19 |     _max_offsety = target->geometry().height()/10; // 上下最大偏移的位置（注意：效果是正负翻倍的）
 20 |     _rect = target->geometry();
 21 |     running = false;
 22 | 
 23 |     // 更新目标点的时钟：1.5秒钟左右
 24 |     update_timer = new QTimer(target);
 25 |     update_timer->setInterval(1000);
 26 |     connect(update_timer, SIGNAL(timeout()), this, SLOT(slotUpdateAims())); // 每隔一段时间更新一下位置
 27 | 
 28 |     // 移动波浪的时钟：40毫秒
 29 |     move_timer = new QTimer(this);
 30 |     move_timer->setInterval(getRandom(35, 45));
 31 |     connect(move_timer, SIGNAL(timeout()), this, SLOT(slotMovePoints()));
 32 | 
 33 |     // y偏移波浪的时钟：4秒左右
 34 |     offset_timer = new QTimer(this);
 35 |     offset_timer->setInterval(4000);
 36 |     connect(offset_timer, SIGNAL(timeout()), this, SLOT(slotSetOffset()));
 37 | 
 38 |     // 慢慢暂停的时钟
 39 |     pause_timer = new QTimer(this);
 40 |     pause_timer->setInterval(3000);
 41 |     connect(pause_timer, &QTimer::timeout, [=]{
 42 |         if (!running)
 43 |         {
 44 |             update_timer->stop();
 45 |             move_timer->stop();
 46 |             offset_timer->stop();
 47 | 
 48 |             for(int i = 0; i < keys.length(); i++)
 49 |                 keys[i].setY(target->geometry().height());
 50 |             offsety = -_max_offsety/2; // 清空偏移（消失时默认都在最下面的，现在恢复）
 51 |         }
 52 |     });
 53 | }
 54 | 
 55 | void BezierWaveBean::start()
 56 | {
 57 |     // 初始化一个值
 58 |     aim_keys.clear();
 59 |     keys.clear();
 60 |     speedys.clear();
 61 |     running = true;
 62 |     for (int i = 0; i < count; i++)
 63 |         aim_keys.append(QPoint(inter*(i-2), getRandomHeight()));
 64 |     for (int i = 0; i < aim_keys.length(); i++)
 65 |         keys.append(QPoint(aim_keys.at(i).x(), target->geometry().height()));
 66 |     for (int i = 0; i < aim_keys.length(); i++)
 67 |         speedys.append(- getRandom(appear_speedy * speedy_step / 2, appear_speedy * speedy_step));
 68 |     qint64 timestamp = getTimestamp();
 69 |     for (int  i = 0; i < aim_keys.length(); i++)
 70 |         aim_updates_timestamp.append(timestamp);
 71 | 
 72 |     update_timer->start();
 73 |     move_timer->start();
 74 |     offset_timer->start();
 75 | 
 76 | }
 77 | 
 78 | void BezierWaveBean::resume()
 79 | {
 80 |     if (keys.length() == 0)
 81 |         return start();
 82 |     if (running) return ; // 正在动画中，没必要
 83 |     update_timer->start();
 84 |     move_timer->start();
 85 |     offset_timer->start();
 86 |     pause_timer->stop();
 87 |     running = true;
 88 |     slotUpdateAims(); // 立即更新目标
 89 |     for (int i = 0; i < speedys.length(); i++)
 90 |         speedys[i] = appear_speedy * speedy_step;
 91 | }
 92 | 
 93 | void BezierWaveBean::pause()
 94 | {
 95 |     running = false;
 96 |     for (int i = 0; i < aim_keys.length(); i++)
 97 |         aim_keys[i].setY(getRandomHeight());
 98 |     pause_timer->start();
 99 | }
100 | 
101 | void BezierWaveBean::set_count(int x)
102 | {
103 |     if (x > 5)
104 |         count = x;
105 | }
106 | 
107 | void BezierWaveBean::set_offsety(int x)
108 | {
109 |     _offsety = x;
110 | }
111 | 
112 | void BezierWaveBean::set_speedx(int x)
113 | {
114 |     speedx = x;
115 | }
116 | 
117 | void BezierWaveBean::set_rect(QRect rect)
118 | {
119 |     int delta = rect.height() - _rect.height();
120 |     inter = rect.width() / (count - 4);
121 |     for (int i = 0; i < keys.length(); i++)
122 |     {
123 |         // 修改所有点的间隔
124 |         //keys[i].setX(keys.at(i).x() * width / _rect.width()); // 按比例缩放……
125 |         keys[i].setX(inter*(i-2)+offsetx);
126 |         aim_keys[i].setX(keys.at(i).x());
127 |         // 修改整体的高度
128 |         keys[i].setY(keys.at(i).y()+delta);
129 |         aim_keys[i].setY(aim_keys.at(i).y()+delta);
130 |     }
131 |     double time = pow(rect.width(), 1.0 / 5); // 代表一个点显示几秒钟
132 |     speedx = rect.width() / (1000 / move_timer->interval()) / time;
133 |     _rect = rect;
134 | }
135 | 
136 | QPainterPath BezierWaveBean::getPainterPath(QPainter& painter)
137 | {
138 |     Q_UNUSED(painter)
139 | 
140 |     // 从关键点生成绘图点
141 |     QList<QPoint>pots;
142 |     for (int i = 0; i < keys.length(); i++)
143 |     {
144 |         if (i & 1) // 奇数
145 |         {
146 |             int x = (keys.at(i-1).x()+keys.at(i).x())/2;
147 |             int y = (keys.at(i-1).y()+keys.at(i).y())/2;
148 |             pots.append(QPoint(x, y));
149 |             pots.append(keys.at(i));
150 |         }
151 |         else // 偶数
152 |             pots.append(keys.at(i));
153 |     }
154 | 
155 |     // y方向的偏移
156 |     for (int i = 0; i < pots.length(); i++)
157 |     {
158 |         pots[i].setY(pots[i].y()+offsety);
159 |     }
160 | 
161 |     // 画进行判断的点
162 |     /*for (int i = 0; i < pots.length(); i++)
163 |     {
164 |         QPoint p = pots.at(i);
165 |         painter.drawEllipse(QRect(p.x()-2, p.y()-2, 4, 4));
166 |     }*/
167 | 
168 |     // 开始画图
169 |     QPainterPath bezier;
170 |     bezier.moveTo(0, target->geometry().height());
171 |     bezier.lineTo(pots.at(1));
172 |     //painter.drawLine(pots.at(0), pots.at(1));
173 |     for (int i = 2; i+2 < pots.count(); i+=3)
174 |     {
175 |         // 画切线线条
176 |         //painter.drawLine(pots.at(i-1), pots.at(i));
177 |         //painter.drawLine(pots.at(i+1), pots.at(i+2));
178 | 
179 |         // 画三阶贝塞尔曲线
180 |         bezier.cubicTo(pots.at(i), pots.at(i+1), pots.at(i+2));
181 |     }
182 |     bezier.lineTo(target->geometry().bottomRight());
183 | 
184 |     return bezier;
185 | }
186 | 
187 | 
188 | int BezierWaveBean::getRandomHeight()
189 | {
190 |     if (running)
191 |     {
192 |         int y = getRandom(target->geometry().height() / 2, target->geometry().height() * 7 / 8);
193 |         return y;
194 |     }
195 |     else
196 |         return int(target->geometry().height()*1.5);
197 | }
198 | 
199 | int BezierWaveBean::getRandom(int min, int max)
200 | {
201 | #if defined (Q_OS_WIN) || defined(Q_OS_LINUX)
202 |     return mt() % (max-min+1) + min;
203 | #elif defined(Q_OS_MAC)
204 | 
205 | #else
206 |     return rand() % (max-min+1) + min;
207 | #endif
208 | }
209 | 
210 | qint64 BezierWaveBean::getTimestamp()
211 | {
212 |     return QDateTime::currentDateTime().toMSecsSinceEpoch();
213 | }
214 | 
215 | void BezierWaveBean::slotUpdateAims()
216 | {
217 |     if (!running) return ;
218 |     /*for (int i = 0; i < speedys.length(); i++)
219 |         if (speedys.at(i) == appear_speedy*speedy_step)
220 |             speedys[i] = 1;*/
221 |     // 生成随机的目标关键点
222 |     int delta = target->geometry().height()/4;
223 |     qint64 timestamp = getTimestamp();
224 |     for (int i = 0; i < aim_keys.length(); i++)
225 |     {
226 |         if (aim_updates_timestamp.at(i) + 3000 > timestamp) // 3秒更新一次
227 |             continue;
228 |         int y = aim_keys.at(i).y() + getRandom(-delta, delta);
229 |         if (y < target->geometry().height() / 2)
230 |             y = target->geometry().height() / 2;
231 |         else if (y > target->geometry().height()*7/8)
232 |             y = target->geometry().height()*7/8;
233 |         aim_keys[i].setY(y + _offsety);
234 |         aim_updates_timestamp[i] = timestamp;
235 |     }
236 | }
237 | 
238 | void BezierWaveBean::slotMovePoints()
239 | {
240 |     // Y方向慢慢移动当前关键点到目标关键点
241 |     for (int i = 0; i < keys.length(); i++)
242 |     {
243 |         QPoint& cur = keys[i];
244 |         QPoint aim = aim_keys[i];
245 |         int del = aim.y()-cur.y();
246 |         if (del > 0) // 应当往下移动
247 |         {
248 |             speedys[i]++; // 向下的加速度
249 | //            speedys[i] += sqrt(del)/speedx/speedy_step+1;
250 |             /*if (speedys.at(i)/speedy_step + abs(del)/100 < del)
251 |                 cur.setY(cur.y()+speedys.at(i)/speedy_step+del/100);
252 |             else
253 |                 cur.setY(cur.y()+del);*/
254 |         }
255 |         else if (del < 0) // 应当往上移动
256 |         {
257 |             speedys[i]--; // 向上的加速度/
258 | //            speedys[i] -= sqrt(-del)/speedx/speedy_step+1;
259 |             /*if (speedys.at(i)/speedy_step+abs(del)/50 < -del)
260 |                 cur.setY(cur.y()-speedys.at(i)/speedy_step+del/50);
261 |             else
262 |                 cur.setY(cur.y()+del);*/
263 |         }
264 |         cur.setY(cur.y()+speedys.at(i)/speedy_step);
265 | //        qDebug() << sqrt(abs(del))/speedx/speedy_step+1;
266 |     }
267 | //    qDebug() << aim_keys[3].y() << keys[3].y() << speedys[3];
268 | 
269 |     // 每次绘图，更新一次Y方向的整体偏移量
270 |     if (offsety+offsety_direct > -_max_offsety && offsety+offsety_direct < _max_offsety)
271 |         offsety += offsety_direct;
272 |     else if (offsety <= -_max_offsety)
273 |         offsety = -_max_offsety;
274 |     else if (offsety >= _max_offsety)
275 |         offsety = _max_offsety;
276 | 
277 |     // x轴方向的偏移
278 |     for (int i = 0; i < keys.length(); i++)
279 |     {
280 |         keys[i].setX(keys[i].x()+speedx);
281 |         aim_keys[i].setX(keys[i].x());
282 |     }
283 |     offsetx += speedx;
284 | 
285 |     // 判断需不需要把右边移动到左边去
286 |     if (offsetx >= inter)
287 |     {
288 |         qint64 timestamp = getTimestamp();
289 |         QPoint p1(keys[0].x()-inter*2, getRandomHeight());
290 |         QPoint p2(keys[0].x()-inter, getRandomHeight());
291 |         keys.insert(0, p2);
292 |         keys.insert(0, p1);
293 |         aim_keys.insert(0, QPoint(p2));
294 |         aim_keys.insert(0, QPoint(p1));
295 |         speedys.insert(0, speedys.at(speedys.length()-1));
296 |         speedys.insert(0, speedys.at(speedys.length()-2));
297 |         aim_updates_timestamp.insert(0, timestamp);
298 |         aim_updates_timestamp.insert(0, timestamp);
299 | 
300 |         offsetx -= inter*2;
301 | 
302 |         if (keys.length() > count+2)
303 |         {
304 |             keys.removeLast();
305 |             keys.removeLast();
306 |             aim_keys.removeLast();
307 |             aim_keys.removeLast();
308 |             speedys.removeLast();
309 |             speedys.removeLast();
310 |             aim_updates_timestamp.removeLast();
311 |             aim_updates_timestamp.removeLast();
312 |         }
313 |     }
314 | 
315 |     // 更新当前界面
316 |     target->update();
317 | 
318 |     /*QString ans = "";
319 |     for (int i = 5; i < 8; i++)
320 |         ans += " (" + QString::number(keys.at(i).y()) + ","+QString::number(keys.at(i).y())+")"+QString::number(speedys.at(i));
321 |     qDebug() << ans;*/
322 | }
323 | 
324 | void BezierWaveBean::slotSetOffset()
325 | {
326 |     if (!running)
327 |     {
328 |         offsety_direct = 1;
329 |         return ;
330 |     }
331 |     // 每隔一段时间，稍微修改波浪的上下偏移位置
332 |     if (getRandom(0,1))
333 |         offsety_direct = 1;
334 |     else
335 |         offsety_direct = -1;
336 | }
337 | 


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/bezierwavebean.h:
--------------------------------------------------------------------------------
 1 | #ifndef BEZIERWAVEBEAN_H
 2 | #define BEZIERWAVEBEAN_H
 3 | 
 4 | #include <QObject>
 5 | #include <QWidget>
 6 | #include <QPaintEvent>
 7 | #include <QList>
 8 | #include <QPainter>
 9 | #include <random>
10 | #include <QTimer>
11 | #include <QDebug>
12 | #include <QDateTime>
13 | 
14 | class BezierWaveBean : public QObject
15 | {
16 |     Q_OBJECT
17 | public:
18 |     BezierWaveBean(QWidget *parent);
19 | 
20 |     void start();
21 |     void resume();
22 |     void pause();
23 | 
24 |     void set_count(int x);
25 |     void set_offsety(int x);
26 |     void set_speedx(int x);
27 |     void set_rect(QRect rect);
28 | 
29 |     QPainterPath getPainterPath(QPainter &painter);
30 | 
31 | protected:
32 |     int getRandomHeight();
33 |     int getRandom(int min, int max);
34 |     qint64 getTimestamp();
35 | 
36 | signals:
37 | 
38 | public slots:
39 |     void slotUpdateAims();
40 |     void slotMovePoints();
41 |     void slotSetOffset();
42 | 
43 | protected:
44 |     QWidget* target;
45 |     int _offsety; // 多层波浪y轴偏移
46 |     int _max_offsety; // y轴上下偏移的最大值
47 |     QRect _rect;
48 | 
49 |     QTimer* update_timer;
50 |     QTimer* move_timer;
51 |     QTimer* offset_timer;
52 |     QTimer* pause_timer;
53 | 
54 |     bool running;
55 | 
56 |     int count;
57 |     int inter;
58 |     int appear_speedy;
59 | 
60 |     int speedy, offsety;
61 |     int offsety_direct;
62 |     int speedx, offsetx;
63 |     QList<int>speedys;
64 |     int speedy_step;
65 |     QList<qint64>aim_updates_timestamp;
66 | 
67 |     QList<QPoint>keys;
68 |     QList<QPoint>aim_keys;
69 | 
70 |     std::random_device rd;
71 |     std::mt19937 mt;
72 | };
73 | 
74 | #endif // BEZIERWAVEBEAN_H
75 | 


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/main.cpp:
--------------------------------------------------------------------------------
 1 | #include "mainwindow.h"
 2 | #include <QApplication>
 3 | 
 4 | int main(int argc, char *argv[])
 5 | {
 6 |     QApplication a(argc, argv);
 7 |     MainWindow w;
 8 |     w.show();
 9 | 
10 |     return a.exec();
11 | }
12 | 


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/mainwindow.cpp:
--------------------------------------------------------------------------------
 1 | #include "mainwindow.h"
 2 | #include "ui_mainwindow.h"
 3 | 
 4 | MainWindow::MainWindow(QWidget *parent) :
 5 |     QMainWindow(parent), ui(new Ui::MainWindow),
 6 |     bw1(nullptr), bw2(nullptr), bw3(nullptr), bw4(nullptr), mt(rd())
 7 | {
 8 |     ui->setupUi(this);
 9 | 
10 |     bw1 = new BezierWaveBean(this);
11 | //    bw1->set_offsety(geometry().height()/20);
12 |     bw1->set_speedx(getRandom(1,5));
13 |     bw1->start();
14 | 
15 |     bw2 = new BezierWaveBean(this);
16 | //    bw2->set_offsety(geometry().height()/10);
17 |     bw2->set_speedx(getRandom(1,5));
18 |     bw2->start();
19 | 
20 |     bw3 = new BezierWaveBean(this);
21 | //    bw3->set_offsety(geometry().height()*3/20);
22 |     bw3->set_speedx(getRandom(1,5));
23 |     bw3->start();
24 | 
25 |     bw4 = new BezierWaveBean(this);
26 | //    bw4->set_offsety(geometry().height()/5);
27 |     bw4->set_speedx(getRandom(1,5));
28 |     bw4->start();
29 | }
30 | 
31 | MainWindow::~MainWindow()
32 | {
33 |     delete ui;
34 | }
35 | 
36 | void MainWindow::paintEvent(QPaintEvent *e)
37 | {
38 |     QPainter painter(this);
39 |     painter.setRenderHint(QPainter::Antialiasing, true);
40 | 
41 |     QPainterPath bezier;
42 | 
43 |     if (bw1 != nullptr)
44 |         bezier = bw1->getPainterPath(painter);
45 |     painter.fillPath(bezier, QColor(255, 0, 0, 50));
46 | 
47 |     if (bw2 != nullptr)
48 |         bezier = bw2->getPainterPath(painter);
49 |     painter.fillPath(bezier, QColor(255, 0, 0, 50));
50 | 
51 |     if (bw3 != nullptr)
52 |         bezier = bw3->getPainterPath(painter);
53 |     painter.fillPath(bezier, QColor(255, 0, 0, 50));
54 | 
55 |     if (bw4 != nullptr)
56 |         bezier = bw4->getPainterPath(painter);
57 |     painter.fillPath(bezier, QColor(255, 0, 0, 50));
58 | 
59 |     return QMainWindow::paintEvent(e);
60 | }
61 | 
62 | void MainWindow::resizeEvent(QResizeEvent *e)
63 | {
64 |     bw1->set_rect(geometry());
65 |     bw2->set_rect(geometry());
66 |     bw3->set_rect(geometry());
67 |     bw4->set_rect(geometry());
68 |     return QMainWindow::resizeEvent(e);
69 | }
70 | 
71 | int MainWindow::getRandom(int min, int max)
72 | {
73 | #if defined (Q_OS_WIN) || defined(Q_OS_LINUX)
74 |     return mt() % (max-min+1) + min;
75 | #elif defined(Q_OS_MAC)
76 | 
77 | #else
78 |     return rand() % (max-min+1) + min;
79 | #endif
80 | }
81 | 
82 | void MainWindow::on_pushButton_clicked()
83 | {
84 |     bw1->pause();
85 |     bw2->pause();
86 |     bw3->pause();
87 |     bw4->pause();
88 | }
89 | 
90 | void MainWindow::on_pushButton_2_clicked()
91 | {
92 |     bw1->resume();
93 |     bw2->resume();
94 |     bw3->resume();
95 |     bw4->resume();
96 | }
97 | 


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/mainwindow.h:
--------------------------------------------------------------------------------
 1 | #ifndef MAINWINDOW_H
 2 | #define MAINWINDOW_H
 3 | 
 4 | #include <QMainWindow>
 5 | #include "bezierwavebean.h"
 6 | 
 7 | namespace Ui {
 8 | class MainWindow;
 9 | }
10 | 
11 | class MainWindow : public QMainWindow
12 | {
13 |     Q_OBJECT
14 | 
15 | public:
16 |     explicit MainWindow(QWidget *parent = nullptr);
17 |     ~MainWindow();
18 | 
19 | protected:
20 |     void paintEvent(QPaintEvent* e) override;
21 |     void resizeEvent(QResizeEvent* e) override;
22 | 
23 |     int getRandom(int min, int max);
24 | 
25 | private:
26 | 
27 | 
28 | public slots:
29 | 
30 | 
31 | private slots:
32 |     void on_pushButton_clicked();
33 | 
34 |     void on_pushButton_2_clicked();
35 | 
36 | private:
37 |     Ui::MainWindow *ui;
38 | 
39 |     BezierWaveBean *bw1, *bw2, *bw3, *bw4;
40 | 
41 |     std::random_device rd;
42 |     std::mt19937 mt;
43 | };
44 | 
45 | #endif // MAINWINDOW_H
46 | 


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/mainwindow.ui:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <ui version="4.0">
 3 |  <class>MainWindow</class>
 4 |  <widget class="QMainWindow" name="MainWindow">
 5 |   <property name="geometry">
 6 |    <rect>
 7 |     <x>0</x>
 8 |     <y>0</y>
 9 |     <width>400</width>
10 |     <height>300</height>
11 |    </rect>
12 |   </property>
13 |   <property name="windowTitle">
14 |    <string>MainWindow</string>
15 |   </property>
16 |   <widget class="QWidget" name="centralWidget">
17 |    <widget class="QPushButton" name="pushButton">
18 |     <property name="geometry">
19 |      <rect>
20 |       <x>40</x>
21 |       <y>10</y>
22 |       <width>75</width>
23 |       <height>23</height>
24 |      </rect>
25 |     </property>
26 |     <property name="text">
27 |      <string>暂停</string>
28 |     </property>
29 |    </widget>
30 |    <widget class="QPushButton" name="pushButton_2">
31 |     <property name="geometry">
32 |      <rect>
33 |       <x>130</x>
34 |       <y>10</y>
35 |       <width>75</width>
36 |       <height>23</height>
37 |      </rect>
38 |     </property>
39 |     <property name="text">
40 |      <string>继续</string>
41 |     </property>
42 |    </widget>
43 |   </widget>
44 |   <widget class="QStatusBar" name="statusBar"/>
45 |  </widget>
46 |  <layoutdefault spacing="6" margin="11"/>
47 |  <resources/>
48 |  <connections/>
49 | </ui>
50 | 


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/pictures/picture.gif:
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https://raw.githubusercontent.com/iwxyi/Bezier-Wave/0d1deb85dec839e09a7723d3535b862ec8badffe/pictures/picture.gif


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