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  1. Qt
  2. QTBUG-12172

Bug when uniting polygon with a QRectF of size 0,0

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Details

    • Bug
    • Resolution: Unresolved
    • P3: Somewhat important
    • None
    • 4.7.0
    • GUI: Painting
    • None

    Description

      When uniting a polygon with a rectangle that has (0,0) size, the uniting results in a strange drawing behavior. See code below and attached screenshot for the result. The case when object being united is zero-size could be taken into account as an early reject.

      QGraphicsScene *scene = new QGraphicsScene(this);
    ui->graphicsView->setScene(scene);
    QRectF r(85, 285, 125-85, 325-285);
    QPolygonF polyRect(r);
    QRectF zero(104, 304, 0,0);
    QPolygonF zeroPoly(zero);

    QGraphicsPolygonItem *poly = new QGraphicsPolygonItem;

    zeroPoly = poly->mapToScene(zeroPoly);
    polyRect = polyRect.united(zeroPoly);

    poly->setPolygon(polyRect);
    poly->setPen(QPen(QColor(Qt::red)));

    scene->addItem(poly);

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            Unassigned Unassigned
            holmsted Lasse Holmstedt
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            Dates

              Created:
              Updated:

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