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     The lineto functions draw a line from the current position up to
     and including the destination point. The destination point for the
     lineto function is given by the view-coordinate point (<x>, <y>).
     The destination point for the lineto_w function is given by the
     window-coordinate point (<wx>, <wy>).
 
     The line is drawn using the current color, logical write mode, and
     line style. If no error occurs, lineto sets the current position to
     the view point (<x>, <y>); lineto_w sets the current position to
     the window point (<wx>, <wy>).
 
     If you use floodfill to fill in a closed figure drawn with lineto
     calls, the figure must be drawn with a solid line-style pattern.
 
     Return Value
 
     The lineto and lineto_w functions return a nonzero value if the
     line is drawn successfully, or 0 if an error occurs.
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