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Drawing precision of arcs

Marco Balen's picture


I noticed that the algorithm of drawing a circle has some approximation.
When I draw a circle (X0,Y0,R3000) , a point on the circle (X0,Y3000) and I zoom to a large scale, the point and the circle don't overlap.
The larger the scale the bigger the distance between the point and the circle in Y axis. At 45 degree the difference is bigger.

How can I improve the quality of the drawing of a circle ?