QPainter painter(this); painter.scale(2, 3); painter.drawRect(50, 50, 100, 100);
QPainter painter(this); painter.translate(100, 100); painter.rotate(45); painter.drawLine(-50, 0, 50, 0);
QPainter painter(this); painter.translate(50, 100); painter.drawRect(50, 50, 100, 100);The package library used for QPainter transform is Qt.