(资料图片仅供参考)

由于最近要写一个东西，所以跳过了一些内容，学到了视图框架和一些简单

的碰撞检测。

对于视图框架，我的理解还是不够深，等以后做项目深入了解后，我会回来更新。

我是写了一个自己的场景和两个图形项。先看main.cpp的代码

#include"myscene.h"#include #include#include"playplany.h"int main(int argc, char *argv[]){QApplication a(argc, argv);QGraphicsView view;//创myscene scene;scene.addRect(0,0,800,800);场景的范围坐标view.setScene(&scene);view.show();return a.exec();}

然后是我的图形项，本来准备用照片的，最后每找到，不过原理都是一样的

#ifndef ENEMYPLANY_H#define ENEMYPLANY_H#include#include#includeclass enemyplany:public QGraphicsObject{public:enemyplany();QRectFboundingRect() const;void paint(QPainter *painter,const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr);void timerEvent(QTimerEvent *event);QPainterPath shape() const;int x;int y;};#endif // ENEMYPLANY_H#include "enemyplany.h"enemyplany::enemyplany(){startTimer(1000);x=500;y=100;}QRectF enemyplany::boundingRect() const//它们画的位置是基于场景的{return QRectF(0,0,800,800);}void enemyplany::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget){painter->drawRect(x,y,40,50);update();}void enemyplany::timerEvent(QTimerEvent *event){x-=30;}QPainterPath enemyplany::shape() const{QPainterPath path;path.addRect(x,y,40,50);//这个函数就是对于进入这个范围的图形项就算碰撞return path;}

再看下一个图形项，其实与这个差不多

#ifndef PLAYPLANY_H#define PLAYPLANY_H#include#include#includeclass playplany:public QGraphicsObject{public:playplany();QRectFboundingRect() const;void paint(QPainter *painter,const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr);void timerEvent(QTimerEvent *event);QPainterPath shape() const;int x=100;int y=100;};#endif // PLAYPLANY_H#include "playplany.h"#includeplayplany::playplany(){startTimer(1000);}QRectF playplany::boundingRect() const{return QRectF(0,0,800,800);}void playplany::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget){painter->drawRect(x,y,40,50);update();}void playplany::timerEvent(QTimerEvent *event){qsrand((unsigned)time(NULL));x+=30;}QPainterPath playplany::shape() const{QPainterPath path;path.addRect(x,y,40,50);//qDebug()<

最后就是场景的设置了，看代码

#ifndef MYSCENE_H#define MYSCENE_H#include#include"enemyplany.h"#include"playplany.h"#include#includeclass myscene:public QGraphicsScene{public:myscene();QRectFboundingRect() const;private:enemyplany *enem_plany;playplany *play_plany;void timerEvent(QTimerEvent *e);};#endif // MYSCENE_H#include "myscene.h"myscene::myscene(){enem_plany=new enemyplany;play_plany=new playplany;this->addItem(enem_plany);this->addItem(play_plany);startTimer(50);}QRectF myscene::boundingRect() const{return QRectF(0,0,800,800);}void myscene::timerEvent(QTimerEvent *e)//每50秒判断一次是否碰撞{if(enem_plany->collidesWithItem(play_plany)){play_plany->x-=30;}}

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