Question

我在我的程序中使用附带QGraphicsScene的QGraphicsView小部件。这部分很完美：

    std::vector<unsigned int> nodesCoordsOnScreen;
    for(int i=0; i<nodesCoords.size(); i++)
    {
        unsigned int tempCoord = spaceH+nodesCoords.at(i)*perOneMmH;
        graphVW->scene()->addEllipse(tempCoord, -4, 8, 8, standartPen);
        QGraphicsTextItem* tempText = graphVW->scene()->addText(QString::number(i+1));
        tempText->setPos(tempCoord+8, 0);
        graphVW->scene()->addEllipse(tempCoord+8, 5, 15, 15, standartPen);
        nodesCoordsOnScreen.push_back(tempCoord);
    }

这有麻烦：

    for(int i=0; i<bars->rowCount(); i++)
    {
        unsigned int begin = barsCoords.at(i).first;
        unsigned int end = barsCoords.at(i).second;
        unsigned int begCrd = nodesCoordsOnScreen.at(begin-1);
        unsigned int endCrd = nodesCoordsOnScreen.at(end-1);
        graphVW->scene()->addRect(begCrd+4, (barsAreas.at(i)/2)*perOneMmV, endCrd-begCrd,
                              -(barsAreas.at(i))*perOneMmV, standartPen);
    }

麻烦很奇怪：当第二部分呈现时 - 它渲染不正确，但如果我移动程序窗口或将其最小化并返回正常状态 - 它呈现正确。

Answer 1

只需在绘图后使用QtGraphicsScene :: update（）。

QGraphicsScene addRect渲染不正确

1 个答案: