Specify the width and height, which are the major and minor axes of the arc. Each arc is specified by a rectangle and two angles. The center of the circle or ellipse is the center of the rectangle, and the major and minor axes are specified by the width and height.
Positive angles indicate counterclockwise motion, and negative angles indicate clockwise motion.
If the magni- tude of angle2 is greater than 360 degrees, XDrawArc or XDrawArcs truncates it to 360 degrees. The path should be defined by the ideal mathematical path. If two arcs join correctly and if the line-width is greater than zero and the arcs intersect, XDrawArc and XDrawArcs do not draw a pixel more than once. Otherwise, the intersecting pixels of intersecting arcs are drawn multiple times. Specifying an arc with one endpoint and a clockwise extent draws the same pixels as specifying the other endpoint and an equivalent counterclockwise extent, except as it affects joins.