C++ QT画图练习

最新推荐文章于 2025-06-22 18:52:26 发布

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最新推荐文章于 2025-06-22 18:52:26 发布 · 693 阅读

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窗口类声明mywidget.h

#ifndef MYWIDGET_H
#define MYWIDGET_H

#include <QWidget>
#include <QPushButton>

class MyWidget : public QWidget
{
    Q_OBJECT

public:
    MyWidget(QWidget *parent = 0);
    ~MyWidget();
    virtual void paintEvent(QPaintEvent *);

    // mouse press event
    virtual void mousePressEvent(QMouseEvent *ev);

    // 按钮
    QPushButton* _button;
    QPoint _ptClick;




};

#endif // MYWIDGET_H

窗口类的函数实现，两个虚函数

#include "mywidget.h"
#include <QPainter>
#include <QMouseEvent>


MyWidget::MyWidget(QWidget *parent)
    : QWidget(parent)
{
    _button = new QPushButton("hello", this);
}

MyWidget::~MyWidget()
{

}

void MyWidget::paintEvent(QPaintEvent *)
{
    // QPainter 绘制类
    QPainter painter(this);

   /* painter.setPen(QColor(255,0,0));
    painter.setBrush(QBrush(QColor(255,255,0)));

    painter.drawLine(QPoint(0,0),QPoint(100,