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     The setlinestyle subroutine selects the mask used for line drawing.
     The <mask> argument is a 16-bit number, where each bit represents a
     pixel in the line being drawn.
 
     If a bit is 1, the corresponding pixel is set to the color of the
     line (the current color). If a bit is 0, the corresponding pixel is
     left unchanged. The template is repeated for the entire length of
     the line.
 
     The default mask is 0xFFFF (a solid line).
 
     The setlinestyle subroutine does not affect arcs, ellipses, or "pie
     slice" wedges.
 
     Return Value
 
     None.
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