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     The _setcolor function sets the current color index to <color>.
     The <color> parameter is masked but always within range. The
     _arc, _ellipse, _floodfill, _lineto, _outgtext, _pie, _rectangle,
     and _setpixel functions use the current color.
 
     The _setcolor function accepts an int value as an argument. It is
     a color index.
 
     The default color index is the highest numbered color in the
     current palette.
 
     Note that the _setcolor function does not affect the output of the
     presentation-graphics functions.
 
     Return Value
 
     This function returns the previous color. If the function fails
     (e.g., if used in text mode), it returns -1.
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