QT5 旋转图片Demo

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QT5 旋转图片Demo

今天因为项目需要做了一个旋转的动画，下面是我的代码，有需要的可以参考：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include "rotatewidget.h"
#include<QPropertyAnimation>
namespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{Q_OBJECTpublic:explicit MainWindow(QWidget *parent = nullptr);~MainWindow();private slots:void on_pushButton_clicked();private:Ui::MainWindow *ui;RotateWidget* mRotateWidget;QPropertyAnimation* anim1;QPropertyAnimation* anim2;
};#endif // MAINWINDOW_H

mainwindow.cpp的代码为：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "rotatewidget.h"
#include<QPropertyAnimation>
MainWindow::MainWindow(QWidget *parent) :QMainWindow(parent),ui(new Ui::MainWindow)
{ui->setupUi(this);mRotateWidget=new RotateWidget();mRotateWidget->setPixmap1(QPixmap(":/Resources/trash.png"));
//    mRotateWidget->setPixmap2(QPixmap(":/Resources/trash.png"));mRotateWidget->resize(300,300);anim1= new QPropertyAnimation (mRotateWidget, "rot1");
//     anim2=new QPropertyAnimation(mRotateWidget, "rot2");anim1->setStartValue(0);
//     anim2->setStartValue(0);anim1->setEndValue(359);
//     anim2->setEndValue(-359);anim1->setLoopCount(-1);
//     anim2->setLoopCount(-1);anim1->setDuration(5000);
//     anim2->setDuration(3000);
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::on_pushButton_clicked()
{anim1->start();
//    anim2->start();mRotateWidget->show();
}

rotatewidget.h的文件代码为：

#ifndef ROTATEWIDGET_H
#define ROTATEWIDGET_H#include <QWidget>class RotateWidget : public QWidget
{Q_OBJECTQ_PROPERTY(int rot1 READ rot1 WRITE setRot1);Q_PROPERTY(int rot2 READ rot2 WRITE setRot2);
public:explicit RotateWidget(QWidget *parent = nullptr);void setPixmap1(QPixmap px);void setPixmap2(QPixmap px);int rot1();int rot2();protected:void paintEvent(QPaintEvent *);public slots:void setRot1(int r1);void setRot2(int r2);
private:int m_rot1;int m_rot2;QPixmap m_px1, m_px2;
};#endif // ROTATEWIDGET_H

rotatewidget.cpp的代码为：

#include "rotatewidget.h"
#include<QPainter>
RotateWidget::RotateWidget(QWidget *parent) : QWidget(parent)
{m_rot1 = 0;m_rot2 = 0;}void RotateWidget::setPixmap1(QPixmap px) {m_px1 = px;update();
}void RotateWidget::setPixmap2(QPixmap px){m_px2 = px;update();}int RotateWidget::rot1()
{return m_rot1;
}
int RotateWidget::rot2()
{return m_rot2;
}void RotateWidget::setRot1(int r1)
{m_rot1 = r1;update();
}
void RotateWidget::setRot2(int r2)
{m_rot2 = r2;update();
}void RotateWidget::paintEvent(QPaintEvent *) {QPainter p(this);p.setRenderHint(QPainter::Antialiasing);p.translate(width()/2, height()/2);if(!m_px1.isNull()) {p.save();p.rotate(m_rot1);QRect r = m_px1.rect();r.moveCenter(QPoint(0,0));p.drawPixmap(r, m_px1);p.restore();}if(!m_px2.isNull()) {p.save();p.rotate(m_rot2);QRect r = m_px2.rect();r.moveCenter(QPoint(0,0));p.drawPixmap(r, m_px2);p.restore();}}

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参考文献

[1].rotate an image.