graphics.hlp (Topic list)
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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
_lineto, _lineto_w
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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 _lineto_w function is implemented as a macro.
 
     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; otherwise, they return 0.
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