QT绘制图像QImage-QPixmap-QBitmap-QPicture

QT绘制图像QImage-QPixmap-QBitmap-QPicture

#ifndef MAINWINDOW10_8_H
#define MAINWINDOW10_8_H
 
#include 
 
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow10_8; }
QT_END_NAMESPACE
 
class MainWindow10_8 : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow10_8(QWidget *parent = nullptr);
    ~MainWindow10_8();
 
private:
    Ui::MainWindow10_8 *ui;
protected:
    void paintEvent(QPaintEvent *event);
};
#endif // MAINWINDOW10_8_H

#include "mainwindow10_8.h"
#include "./ui_mainwindow10_8.h"
#include 
#include 
#include 
#include 
#include 
//绘制图像
MainWindow10_8::MainWindow10_8(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow10_8)
{
    ui->setupUi(this);
}
 
MainWindow10_8::~MainWindow10_8()
{
    delete ui;
}
 
void MainWindow10_8::paintEvent(QPaintEvent *event)
{
    QPainter painter2(this);
  //  painter2.setPen(Qt::blue);
  //  painter2.drawText(0,0,60,60,Qt::AlignCenter,tr("QImage"));
    //绘制image
    QImage image2(100,100,QImage::Format_ARGB32);
    painter2.begin(&image2);
    painter2.setPen(QPen(Qt::green,3));
    painter2.setBrush(Qt::yellow);
    painter2.drawRect(10,10,60,60);
    painter2.drawText(10,10,60,60,Qt::AlignCenter,tr("QImage"));
    painter2.setBrush(QColor(0,0,0,100));
    painter2.drawRect(50,50,40,40);
  //  painter2.save();
   painter2.end();
 
    //绘制pixmap
 
    QPixmap pix(100,100);
    painter2.begin(&pix);
    painter2.setPen(QPen(Qt::green,3));
    painter2.setBrush(Qt::yellow);
   //  painter2.translate(180,0);
 
    painter2.drawRect(10,10,60,60);
    painter2.drawText(10,10,60,60,Qt::AlignCenter,tr("QPixmap"));
    painter2.setBrush(QColor(0,0,0,100));
    painter2.drawRect(50,50,40,40);
    painter2.end();
 
    QBitmap bit(100,100);
    painter2.begin(&bit);
    painter2.setPen(QPen(Qt::green,3));
    painter2.setBrush(Qt::yellow);
   // painter2.restore();
    // painter2.translate(0,100);
 
    painter2.drawRect(10,10,60,60);
    painter2.drawText(10,10,60,60,Qt::AlignCenter,tr("QBitmap"));
    painter2.setBrush(QColor(0,0,0,100));
    painter2.drawRect(50,50,40,40);
  painter2.end();
 
    QPicture picture;
    painter2.begin(&picture);
    painter2.setPen(QPen(Qt::green,3));
    painter2.setBrush(Qt::yellow);
    //painter2.restore();
    // painter2.translate(180,0);
 
    painter2.drawRect(10,10,60,60);
    painter2.drawText(10,10,60,60,Qt::AlignCenter,tr("QPicture"));
    painter2.setBrush(QColor(0,0,0,100));
    painter2.drawRect(50,50,40,40);
   painter2.end();
 
    //在widget部件上进行绘制
    painter2.begin(this);
    painter2.drawImage(50,20,image2);
    painter2.drawPixmap(200,20,pix);
    painter2.drawPixmap(50,170,bit);
    painter2.drawPicture(200,170,picture);
}