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     The arc functions draw elliptical arcs.
 
     The arc routine uses the view coordinate system. The center of
     the arc is the center of the bounding rectangle defined by the
     points (<x1>, <y1>) and (<x2>, <y2>). The arc starts where it
     intersects the imaginary line extending from the center of the
     arc through (<x3>, <y3>). It is drawn counterclockwise about the
     center of the arc, ending where it intersects an imaginary line
     extending from the center of the arc through (<x4>, <y4>).
 
     The arc_w routine uses the window coordinate system. In all other
     respects, it is identical to the arc routine.
 
     In both cases, the arc is drawn using the current color. Since an
     arc does not define a closed area, it is not filled.
 
     Return Value
 
     The arc and arc_w functions return a nonzero value if the arc is
     successfully drawn; otherwise, they return 0.
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