填空题 程序分析题: 已知程序运行后,运行效果如图所示,请完成代码段的填空. void Widget::paintEvent(QPaintEvent *) { QPainter ;//创建画家对象 QRectF rectangle(50,50,200,100); painter.drawRect(rectangle); painter. (50,30,"图形绘制");//绘制文字 QPen pen; pen.setColor(Qt::red); pen.setWidth(3); ;//设置画笔 painter.drawArc(rectangle,0,90*16); pen.setColor(Qt::blue); QBrush brush; brush.setColor(Qt::green); brush.setStyle(Qt::CrossPattern); painter.setPen(pen); painter.setBrush(brush); painter. ;//绘制曲线 }