QGraphic学习笔记

一个小的简单的游戏引出的心得体会

分解实例1

实例描述：

实现一个按钮，按钮继承自QGraphicObject，

头文件：

class myButton:public QGraphicsObject

{

Q_OBJECT

public:

myButton(int,int,QString,QString,class MainWindow*);

QRectF boundingRect()const;

void paint(QPainter*,const QStyleOptionGraphicsItem*,QWidget*); protected:

void hoverEnterEvent(QGraphicsSceneHoverEvent*);

void hoverLeaveEvent(QGraphicsSceneHoverEvent*);

void mousePressEvent(QGraphicsSceneMouseEvent*);

private:

QPixmap pix;

QString img;

QString hoverImg;

class MainWindow*m;

Phonon::MediaObject*clickMic;

signals:

void clickSig();

};

源文件：

myButton::myButton(int x,int y,QString img,QString hoverImg,class MainWindow* m){

this->img=img;

this->hoverImg=hoverImg;

pix.load(img);

setPos(x-pix.width()/2,y-pix.height()/2);

this->m=m;

setFlags(QGraphicsItem::ItemIsFocusable);

setFlags(QGraphicsItem::ItemIsMovable);

setAcceptHoverEvents(true);

clickMic=Phonon::createPlayer(Phonon::MusicCategory,

Phonon::MediaSource(":/sound/click.mp3"));

}

QRectF myButton::boundingRect()const{

return QRectF(0,0,pix.width(),pix.height());

}

void myButton::paint(QPainter*painter,const QStyleOptionGraphicsItem *option,QWidget*widget){

painter->drawPixmap(0,0,pix.width(),pix.height(),pix);

}

void myButton::hoverEnterEvent(QGraphicsSceneHoverEvent*){ setFocus(Qt::MouseFocusReason);

pix.load(hoverImg);

clickMic->play();

update();

}

void myButton::hoverLeaveEvent(QGraphicsSceneHoverEvent*){ setFocus(Qt::MouseFocusReason);

pix.load(img);

update();

}

void myButton::mousePressEvent(QGraphicsSceneMouseEvent*){ emit clickSig();

}

引用文件：

cjScene=new QGraphicsScene;//新建场景指针

cjScene->clear();

myButton*sbtn=new

myButton(width/2,height/2-200,":images/startBtn1.png",":images/startB tn2.png",this);

connect(sbtn,SIGNAL(clickSig()),this,SLOT(guanKaScene()));

cjScene->addItem(sbtn);

myButton*soundBtn=new

myButton(width/2,height/2,":images/soundBtn1.png",":images/soundBtn2. png",this);

cjScene->addItem(soundBtn);

myButton*quitBtn=new

myButton(width/2,height/2+200,":images/quitBtn1.png",":images/quitBtn 2.png",this);

connect(quitBtn,SIGNAL(clickSig()),this,SLOT(close()));

cjScene->addItem(quitBtn);

cjScene->setSceneRect(0,0,width,height);

cjScene->setBackgroundBrush(QPixmap(":/images/panelBg.bmp").scaled(w idth,height));

this->setScene(cjScene);

绘制动画精灵1：

void ninjia::play(){

QTimeLine*timeline=new QTimeLine(200);

timeline->setFrameRange(1,4);

connect(timeline,SIGNAL(frameChanged(int)),this,SLOT(move_play(int))) ;

timeline->start();

}

void ninjia::move_play(int i){

qDebug()<<i;

if(i==4){

QString path=":images/ninjia/1.png";

pix.load(path);

return;

}

QString path=":images/ninjia/"+QString::number(i)+".png";

pix.load(path);

}

绘制动画精灵2：

timeline=new QTimeLine(1000);

timeline->setFrameRange(1,maxFrame);

timeline->setLoopCount(0);

connect(timeline,SIGNAL(frameChanged(int)),this,

SLOT(move_play(int)));

timeline->start();

void target::move_play(int i){

qDebug()<<i;

QString path=imgPath+QString::number(i)+".png";

pix.load(path);

}

精灵的碰撞检测：