Details
-
Bug
-
Resolution: Unresolved
-
P3: Somewhat important
-
None
-
5.3.2
-
None
-
VS2013 x64 Windows 10 *Debug* build. OpenGL desktop.
Description
The code below causes a 100% reproducible assert failure in the debug build. It seems to be a rounding issue during double-to-float conversion within qtriangulatingstroker.
The assert is:
ASSERT: "dx != 0 || dy != 0" in file [...]/src/gui/opengl/qtriangulatingstroker_p.h, line 129
The object is a QGraphicsObject placed in a QGraphicsScene with a QGLWidget viewport. The release build appears un-affected (or the assert is benign).
void myGraphicsObject::paint( QPainter * painter,
const QStyleOptionGraphicsItem * option,
QWidget * widget )
{
Q_UNUSED(option);
Q_UNUSED(widget);
const QRectF arcRect( 670.26338831832493, 1144.2051306797334, 48.0, 48.0 );
const double arcStart = -2.6620260032633371e-005;
const double arcLength = 119.81421651085529;
QPainterPath arcPath;
arcPath.arcMoveTo( arcRect, arcStart );
arcPath.arcTo( arcRect, arcStart, arcLength );
painter->drawPath( arcPath );
return;
}