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void MainWindow::on_pushButton_2_clicked()
{
QRect rc = QRect(0,0,pm.width(),pm.height());
QPixmap *pp = ±
pp->scroll(-20,0,rc);
QPainter painter;
painter.begin(&pm);
painter.fillRect(pm.width()-20,0,20,pm.height(),QBrush(Qt::transparent));
// QRect rc1 = QRect(pm.width()-20,0,20,pm.height());
// QPixmap ap(20, pm.height());
// ap.fill(Qt::transparent);
// painter.drawPixmap(rc1,ap);
painter.end();
update();
}