QT学习记录 QT学习 QPixmap,QImage,QPicture(qt5)

 #include "widget.h"

    
 #include "ui_widget.h"
    
 #include<QPixmap>
    
 #include<QPainter>
    
  
    
 Widget::Widget(QWidget *parent) :
    
     QWidget(parent),
    
     ui(new Ui::Widget)
    
 {
    
     ui->setupUi(this);
    
     //Pixmap绘图  专门为平台做了现实的优化
    
     QPixmap pix(300,300);
    
  
    
     pix.fill(Qt::white);
    
     //声明画家
    
     QPainter painter(&pix);
    
     painter.setPen(Qt::blue);
    
     painter.drawEllipse(QPoint(100,100),50,50);
    
     //保存
    
     pix.save("F:\ pix.png");
    
  
    
 }
    
  
    
 Widget::~Widg