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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_wxy routine (implemented as a macro) uses the real-world
     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_wxy functions return a nonzero value if the
     arc is successfully drawn; otherwise, they return 0.
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