浅谈QGraphics

  1. 概要
    QGraphics 是QT里面很重要的一个模块,用得比较多的几个类应该是QGraphicsScene,
    QGraphicsView, QGraphicsItem
  2. 效果
    浅谈QGraphics_第1张图片
  3. 代码
    .h文件
#define DIALOG_H

#include <QDialog>

namespace Ui {
class Dialog;
}

class QGraphicsScene;
class QGraphicsView;
class QGraphicsPixmapItem;

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();

private slots:

private:
    void init();
    void setNewPixmap(const QPixmap& pixmap);

private:
    Ui::Dialog *ui;

    QGraphicsScene *m_scene;
    QGraphicsView *m_view;
    QGraphicsPixmapItem *m_item;
};

#endif // DIALOG_H

.cpp文件

#include "dialog.h"
#include "ui_dialog.h"

#include <QtWidgets/QGraphicsScene>
#include <QtWidgets/QGraphicsView>
#include <QtWidgets/QGraphicsPixmapItem>

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    init();
}

Dialog::~Dialog()
{
    delete ui;
}

void Dialog::init()
{
    QPixmap pixmap(QLatin1String(":/images/chineseFlag.png"));
    m_item = new QGraphicsPixmapItem(pixmap);
    m_scene = new QGraphicsScene(this);
    m_view = new QGraphicsView(ui->widget);

    m_scene->addItem(m_item);
    m_view->setScene(m_scene);
    m_view->show();

    //这里是很关键的地方,就是一个item需要放在一个场景里面(scene),而场景又是视图view的一部份。
}

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