Hi.

I have arc:

A coordinates (arc start point):
X: 31.963
Y: 70.548

B coordinates (arc end point):
X: 26.963
Y: 65.548

C coordinates (arc center point):
X: 31.963
Y: 65.548

calculated:
radius = 5.0
startAngle = 90.0
endAngle = 180.0
spanAngle = 90.0

Using calculated data, the arc must be placed between 9 and 12 o'clock:

arc1.png

But its placed between 6 and 9 o'clock:

arc2.png

Why? QPainter / QGraphicsView bug? Or what?