Cartesian coordinate system in QPaint

[graciano]

Hi
His there a way to change de default coordinate system of a QPaintDevice so that if works like a Cartesian coordinate system in QPainter, with (0,0) as the center?

[^NyAw^]

Hi,

Take a look at Coordinate System on Window-Viewport Conversion http://doc.qt.io/qt-4.8/coordsys.html.

[wysota]

QPainter p(this);
p.translate(width()/2, height()/2);
p.scale(1, -1);

QPainter p(this);
p.translate(width()/2, height()/2);
p.scale(1, -1);

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Note that such transformations will slow down drawing.