SYNOPSIS
#include <pslib.h>
void PS_arc(PSDoc *psdoc, float x, float y, float radius, float alpha, float beta)
DESCRIPTION
Draws a portion of a circle with its middle point at
(x, y). The arc starts at
an angle of alpha and ends at an angle of
beta. It is drawn counterclockwise.
The subpath added to the current path starts on the arc at angle
alpha and ends on the arc at angle
beta.