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  1. Qt
  2. QTBUG-123562

PolygonF's intersected method return the wrong result with a specific polygon shape

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      Hi !

      When I try to intersect those 2 polygons:

       

      QPolygonF poly1;
QPolygonF poly2;
    
poly1.append(QPointF(72.80599977946001, -20.0));
poly1.append(QPointF(79.4595245353603, -20.0));
poly1.append(QPointF(175.0, -20.0));
poly1.append(QPointF(175.0, 20.0));
poly1.append(QPointF(85.83632192403258, 20.0));
poly1.append(QPointF(72.80599977946001, -20.0));

poly2.append(QPointF(138.90690452319478, -20.0));
poly2.append(QPointF(132.25337970676924, -19.999999999999996));
poly2.append(QPointF(-175.0, -19.999999999999996));
poly2.append(QPointF(-175.0, 20.0));
poly2.append(QPointF(0.0, 20.0));
poly2.append(QPointF(125.87658237835221, 20.0));
poly2.append(QPointF(138.90690452319478, -20.0));

      It returns this:

       

      Blue: poly1

      Red: poly2

      Yellow: intersected polygon

       

      We can clearly see that the intesected polygon is not the polygon expected

       

      Attachments

        1. image-2024-03-21-10-15-15-015.png
          22 kB
          gael bertrand
        2. main.cpp
          0.2 kB
          gael bertrand
        3. mainwindow.cpp
          2 kB
          gael bertrand
        4. mainwindow.h
          1 kB
          gael bertrand
        5. mainwindow.ui
          0.9 kB
          gael bertrand
        6. TestIntersectPoly.pro
          0.6 kB
          gael bertrand
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            bibr Andreas Aardal Hanssen
            inadvertance gael bertrand
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              Created:
              Updated:

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