QT5 旋转图片Demo

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 #include "rotatewidget.h"#includenamespace 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"#includeMainWindow::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 class RotateWidget : public QWidget{ Q_OBJECT Q_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"#includeRotateWidget::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(); } }

参考文献

[1].​​rotate an image​​​. ​​https://qtcentre.org/threads/53765-rotate-an-image​​

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