Python中的QPixmap用法详解

void Dialog::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    QPixmap pix;
    pix.load(“D:/1.jpg”);
    painter.drawPixmap(0,0,50,50,pix); //在（0，0）点起始的宽高均为50的句型中显示图片
 
    painter.translate(50,50); //将起始点改为（50，50）
    painter.drawPixmap(0,0,50,50,pix); //在（50，50）起始的宽高为50的矩形中显示图片
}

void Dialog::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    QPixmap pix;
    pix.load(“D:/1.jpg”);
    painter.drawPixmap(0,0,50,50,pix); //在（0，0）点起始的宽高均为50的句型中显示图片
    
    qreal wid = pix.width(); //获取图像的宽高
    qreal hei = pix.height();
    pix = pix.scaled(wid*2,hei*2,Qt::KeepAspectRatio);//将图片宽高扩大两倍，且在矩形内保持宽高比值
    painter.drawPixmap(50,50,pix);
}

void Dialog::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    QPixmap pix;
    pix.load(“D:/1.jpg”);
    painter.translate(50,50); //将旋转中心改为（50，50）
    painter.rotate(90); //顺时针旋转90度
    painter.translate(-50,-50); 
    painter.drawPixmap(0,0,50,50,pix); 
}

void Dialog::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    QPixmap pix;
    pix.load(“D:/1.jpg”);
    painter.drawPixmap(0,0,50,50,pix); 
    painter.shear(0.5,0) ;//横向扭曲
    painter.drawPixmap(50,0,50,50,pix); 
    painter.shear(0,0.5);//纵向扭曲
    painter.drawPixmap(0,50,50,50,pix); 
    painter.shear(0.5,0.5);//同时横纵扭曲
    painter.drawPixmap(50,50,50,50,pix); 
}