QGraphicsView_Demo.txt

/***********************************.H*********************/
#ifndef MYVIEW_H  
#define MYVIEW_H  

#include <QGraphicsView>  

class MyView : public QGraphicsView
{
Q_OBJECT
public:
explicit MyView(QWidget *parent = 0);

// 平移速度
void setTranslateSpeed(qreal speed);
qreal translateSpeed() const;
// 缩放的增量
void setZoomDelta(qreal delta);
qreal zoomDelta() const;
void zoomIn();  // 放大
void zoomOut();  // 缩小
void zoom(float scaleFactor); // 缩放 - scaleFactor：缩放的比例因子
protected:
void mousePressEvent(QMouseEvent *event);
void mouseReleaseEvent(QMouseEvent *event);
void mouseMoveEvent(QMouseEvent *event);
void wheelEvent(QWheelEvent *event);

public:
bool m_isMoving;