[英]Qt: resize a QGraphicsItem (boundingRect()) into a QGraphicsScene with the mouse
[英]Qt QGraphicsItem drawing a polygon within the boundingRect() of separate class?
我已经在新类中创建了GraphicsItem并绘制了多边形,但是,不是在类的boundingRect()内绘制它,而是在主GraphicsView上的坐标处绘制,希望它会在boundingRect()中绘制)。
Detector::Detector()
{
Pressed = false; //Initally the pressed boolean is false, it is not pressed
setFlag(ItemIsMovable);
}
QRectF Detector::boundingRect() const
{
return QRectF(780,425,70,40);
}
void Detector::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
QRectF ItemBoundary = boundingRect();
QBrush *fillBrush = new QBrush(QColor(83,71,65));
QPolygon DetectorPolygon;
DetectorPolygon << QPoint(0,0);
DetectorPolygon << QPoint(20,10);
DetectorPolygon << QPoint(70,10);
DetectorPolygon << QPoint(70,20);
DetectorPolygon << QPoint(20,20);
DetectorPolygon << QPoint(0,40);
QPen borderPen;
borderPen.setWidth(2);
borderPen.setColor(QColor(152,133,117));
painter->setBrush(*fillBrush);
painter->setPen(borderPen);
painter->drawPolygon(DetectorPolygon);
// painter->fillRect(ItemBoundary,*fillBrush);
// painter->drawRect(ItemBoundary);
}
最后两行在未注释掉时将用矩形填充boundingRect(),与上面的多边形不同,我可以将ItemBoundary变量传递给它。
如何将ItemBoundary(= BoundingRect())传递给多边形?
编辑:本质上,我想绘制一个多边形,该多边形可以移动并作为一个单独的类,以发送到我的主用户界面中的QGraphicsView。
正如@FrankOsterfeld所说:
painter->translate(780,425);
将项目移到boundingRect()所在的区域中。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.