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 <QApplication>
#include<QGraphicsView>
#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<QGraphicsObject>
#include<QTimerEvent>
#include<QPainter>
class enemyplany:public QGraphicsObject
{
public:
enemyplany();
QRectF
boundingRect() 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<QGraphicsObject>
#include<QTimer>
#include<QTimerEvent>
class playplany:public QGraphicsObject
{
public:
playplany();
QRectF
boundingRect() 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"
#include<QPainter>
playplany::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()<<path<<endl;
return path;
}
最后就是场景的设置了,看代码
#ifndef MYSCENE_H
#define MYSCENE_H
#include<QGraphicsScene>
#include"enemyplany.h"
#include"playplany.h"
#include<QTime>
#include<QTimerEvent>
class myscene:public QGraphicsScene
{
public:
myscene();
QRectF
boundingRect() 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;
}
}
最后可以运行一下程序看一看。