star drawing in Star Delegate Example

[embeddedmz]

Hi everyone,

Can someone explain me how with only 5 points, they manage to draw a star having 10 points ?

https://doc.qt.io/qt-5/qtwidgets-ite...e-example.html

Star points :

starPolygon << QPointF(1.0, 0.5);
    for (int i = 1; i < 5; ++i)
        starPolygon << QPointF(0.5 + 0.5 * std::cos(0.8 * i * 3.14),
                               0.5 + 0.5 * std::sin(0.8 * i * 3.14));

starPolygon << QPointF(1.0, 0.5);
    for (int i = 1; i < 5; ++i)
        starPolygon << QPointF(0.5 + 0.5 * std::cos(0.8 * i * 3.14),
                               0.5 + 0.5 * std::sin(0.8 * i * 3.14));

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Star drawing :

painter->drawPolygon(starPolygon, Qt::WindingFill);

painter->drawPolygon(starPolygon, Qt::WindingFill);

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Apparently, it's "Qt::WindingFill" that does the magic but it's not obvious.

Thanks.