用qt的图形视图框架实现的圆,三角形,矩形运动及碰撞.

用qt的图形视图框架实现的圆,三角形,矩形运动及碰撞.

效果如图:

/*main.cpp*/#include "project.h"#include <QtWidgets/QApplication>int main(int argc, char *argv[]){QApplication a(argc, argv);Project w;w.show();return a.exec();}

/*project.h*/#ifndef PROJECT_H#define PROJECT_H#include <QtWidgets/QWidget>#include "ui_project.h"#include <QGraphicsEllipseItem>#include <QGraphicsRectItem>#include <QGraphicsPolygonItem>#include <QGraphicsScene>#include <QGraphicsView>#include <QPolygonF>class Project : public QWidget{Q_OBJECTpublic:Project(QWidget *parent = 0);protected slots:void buttonStartClicked();void buttonPauseClicked();void buttonStopClicked();void buttonAddClicked();void buttonMinusClicked();protected:void timerEvent(QTimerEvent *);private:Ui::ProjectClass ui;QGraphicsEllipseItem *ballItem;QGraphicsRectItem *rectItem;QGraphicsPolygonItem *triAngleItem;QGraphicsScene *scene0;QGraphicsScene *scene1;QGraphicsScene *scene2;qreal x0, y0, intervalX0,intervalY0;qreal x1, y1, intervalX1,intervalY1;qreal x2, y2, intervalX2,intervalY2;QTimer *timer;int id0, id1, id2;QPolygonF polygon;};#endif // PROJECT_H

/*project.cpp*/#include "project.h"#include <QTimer>#include <QTimerEvent>Project::Project(QWidget *parent): QWidget(parent){ui.setupUi(this);/*设置第一个场景*/scene0 = new QGraphicsScene;scene0->setSceneRect(-300, -300, 600, 600);//场景大小ballItem = new QGraphicsEllipseItem();ballItem->setPen(Qt::NoPen);/*设置球的颜色, 渐变*/QRadialGradient gradient(QPointF(x0+25, y0+25), 25, QPointF((x0+25)/2,(y0+25)/2));gradient.setColorAt(0, QColor(255, 255, 255, 255));gradient.setColorAt(0.25, QColor(0, 255, 255, 180));gradient.setColorAt(1, QColor(0, 0, 255, 100));ballItem->setBrush(gradient);scene0->addItem(ballItem);ballItem->setRect(QRectF(-25, -25, 50, 50));ui.viewBall->setRenderHint(QPainter::Antialiasing);ui.viewBall->setBackgroundBrush(QColor(0x9F, 0x79, 0xEE));ui.viewBall->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);ui.viewBall->setScene(scene0);ui.viewBall->show();/*设置第二个场景*/scene1 = new QGraphicsScene;scene1->setSceneRect(-300, -300, 600, 600);rectItem = new QGraphicsRectItem();rectItem->setPen(Qt::NoPen);rectItem->setBrush(Qt::darkRed);scene1->addItem(rectItem);rectItem->setRect(QRectF(-25, -25, 50, 50));ui.viewRect->setRenderHint(QPainter::Antialiasing);ui.viewRect->setBackgroundBrush(QColor(0x9F, 0x79, 0xEE));ui.viewRect->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);ui.viewRect->setScene(scene1);ui.viewRect->show();/*设置第三个场景*/scene2 = new QGraphicsScene;scene2->setSceneRect(-300, -300, 600, 600);triAngleItem = new QGraphicsPolygonItem();triAngleItem->setPen(Qt::NoPen);triAngleItem->setBrush(Qt::green);scene2->addItem(triAngleItem);polygon<<QPointF(-25, -25)<<QPointF(25, -25)<<QPointF(0, 25);triAngleItem->setPolygon(polygon);ui.viewTriAngle->setRenderHint(QPainter::Antialiasing);ui.viewTriAngle->setBackgroundBrush(QColor(0x9F, 0x79, 0xEE));ui.viewTriAngle->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);ui.viewTriAngle->setScene(scene2);ui.viewTriAngle->show();x0 = -25; y0 = -25;intervalX0 = 0.5;  /*x步长*/intervalY0 = 0.8; /*y步长*/x1 = -25; y1 = -25;intervalX1 = 0.5;intervalY1 = 0.8;x2 = -25; y2 = -25;intervalX2 = 0.5;intervalY2 = 0.8;connect(ui.buttonStart, SIGNAL(clicked()), this, SLOT(buttonStartClicked()));connect(ui.buttonPause, SIGNAL(clicked()), this, SLOT(buttonPauseClicked()));connect(ui.buttonStop, SIGNAL(clicked()), this, SLOT(buttonStopClicked()));connect(ui.buttonAdd, SIGNAL(clicked()), this, SLOT(buttonAddClicked()));connect(ui.buttonMinus, SIGNAL(clicked()), this, SLOT(buttonMinusClicked()));}void Project::timerEvent( QTimerEvent *event ){if(ui.tab_4->currentIndex() == 0)//第二个场景{QRadialGradient gradient(QPointF(x0+25, y0+25), 25, QPointF((x0+25)/2,(y0+25)/2));gradient.setColorAt(0, QColor(255, 255, 255, 255));gradient.setColorAt(0.25, QColor(0, 255, 255, 180));gradient.setColorAt(1, QColor(0, 0, 255, 100));ballItem->setBrush(gradient);if(event->timerId() == id0)/*第一个定时器*/{ballItem->setRect(QRectF(x0, y0, 50, 50));x0 +=intervalX0;//运动y0 +=intervalY0;/*判断反弹*/if(x0+50 > 292){x0 = 292 - (x0+50-292)-50;intervalX0 = -intervalX0;}if(y0+50 >284){y0 = 284-(y0+50-284)-50;intervalY0 = -intervalY0;}if(x0 <-290){x0= -290-x0-290;intervalX0 = -intervalX0;}if(y0 <-290){y0 = -290-y0-290;intervalY0 = -intervalY0;}update();}}if(ui.tab_4->currentIndex() == 1)//第二个场景{if(event->timerId() == id1)/*第二个定时器*/{rectItem->setRect(QRectF(x1, y1, 50, 50));x1 +=intervalX1;y1 +=intervalY1;if(x1+50 > 292){x1 = 292 - (x1+50-292)-50;intervalX1 = -intervalX1;}if(y1+50 >284){y1 = 284-(y1+50-284)-50;intervalY1 = -intervalY1;}if(x1 <-290){x1 = -290-x1-290;intervalX1 = -intervalX1;}if(y1 <-290){y1 = -290-y1-290;intervalY1 = -intervalY1;}update();}}if(ui.tab_4->currentIndex() == 2)<span style="font-family: Arial, Helvetica, sans-serif;">//第三个场景</span>{if(event->timerId() == id2)//第三个定时器{update();x2 +=intervalX2;y2 +=intervalY2;if(x2+50 > 292){x2 = 292 - (x2+50-292)-50;intervalX2 = -intervalX2;}if(y2+50 >284){y2 = 284-(y2+50-284)-50;intervalY2 = -intervalY2;}if(x2 <-290){x2 = -290-x2-290;intervalX2 = -intervalX2;}if(y2 <-290){y2 = -290-y2-290;intervalY2 = -intervalY2;}polygon.clear();polygon<<QPointF(x2, y2)<<QPointF(x2+50, y2)<<QPointF(x2+25, y2+50);triAngleItem->setPolygon(polygon);}}}void Project::buttonStartClicked()//开始按钮,启动对应定时器{if(ui.tab_4->currentIndex() == 0)id0 = startTimer(10);if(ui.tab_4->currentIndex() == 1)id1 = startTimer(10);if(ui.tab_4->currentIndex() == 2)id2 = startTimer(10);}void Project::buttonPauseClicked()//暂停按钮{if(ui.tab_4->currentIndex() == 0) killTimer(id0);if(ui.tab_4->currentIndex() == 1)killTimer(id1);if(ui.tab_4->currentIndex() == 2)killTimer(id2);}void Project::buttonStopClicked()//停止按钮, 恢复初始化状态{if(ui.tab_4->currentIndex() == 0){killTimer(id0);scene0->removeItem(ballItem);x0 = -25;y0 = -25;intervalX0 = 0.5;intervalY0 = 0.8;ballItem = new QGraphicsEllipseItem();ballItem->setPen(Qt::NoPen);ballItem->setBrush(Qt::darkRed);scene0->addItem(ballItem);ballItem->setRect(QRectF(x0, y0, 50, 50));}if(ui.tab_4->currentIndex() == 1){killTimer(id1);scene1->removeItem(rectItem);x1 = -25;y1 = -25;intervalX1 = 0.5;intervalY1 = 0.8;rectItem = new QGraphicsRectItem();rectItem->setPen(Qt::NoPen);rectItem->setBrush(Qt::darkRed);scene1->addItem(rectItem);rectItem->setRect(QRectF(x1, y1, 50, 50));}if(ui.tab_4->currentIndex() == 2){killTimer(id2);scene0->removeItem(triAngleItem);x2 = -25;y2 = -25;intervalX2 = 0.5;intervalY2 = 0.8;triAngleItem = new QGraphicsPolygonItem();triAngleItem->setPen(Qt::NoPen);triAngleItem->setBrush(Qt::darkRed);scene2->addItem(triAngleItem);polygon<<QPointF(x2, y2)<<QPointF(x2+50, y2)<<QPointF(x2+25, y2+50);triAngleItem->setPolygon(polygon);}}void Project::buttonAddClicked()//加速,增加步长{if(ui.tab_4->currentIndex() == 0){intervalX0 *= 1.5;intervalY0 *= 1.5;}if(ui.tab_4->currentIndex() == 1){intervalX1 *= 1.5;intervalY1 *= 1.5;}if(ui.tab_4->currentIndex() == 2){intervalX2 *= 1.5;intervalY2 *= 1.5;}}void Project::buttonMinusClicked()//减速, 减小步长{if(ui.tab_4->currentIndex() == 0){intervalX0 *= 1/1.5;intervalY0 *= 1/1.5;}if(ui.tab_4->currentIndex() == 1){intervalX1 *= 1/1.5;intervalY1 *= 1/1.5;}if(ui.tab_4->currentIndex() == 2){intervalX2 *= 1/1.5;intervalY2 *= 1/1.5;}}