plpoin.3plplot man page
plpoin — Plot a glyph at the specified points
plpoin(n, x, y, code)
Plot a glyph at the specified points. (This function is largely superseded by plstring(3plplot) which gives access to many[!] more glyphs.) code=-1 means try to just draw a point. Right now it's just a move and a draw at the same place. Not ideal, since a sufficiently intelligent output device may optimize it away, or there may be faster ways of doing it. This is OK for now, though, and offers a 4X speedup over drawing a Hershey font "point" (which is actually diamond shaped and therefore takes 4 strokes to draw). If 0 < code < 32, then a useful (but small subset) of Hershey symbols is plotted. If 32 <= code <= 127 the corresponding printable ASCII character is plotted.
Redacted form: plpoin(x, y, code)
This function is used in examples 1, 6, 14, and 29.
- n (PLINT(3plplot), input)
Number of points in the x and y vectors.
- x (PLFLT_VECTOR(3plplot), input)
A vector containing the x coordinates of points.
- y (PLFLT_VECTOR(3plplot), input)
A vector containing the y coordinates of points.
- code (PLINT(3plplot), input)
Hershey symbol code (in "ascii-indexed" form with -1 <= code <= 127) corresponding to a glyph to be plotted at each of the n points.
Many developers (who are credited at http://plplot.sourceforge.net/credits.php) have contributed to PLplot over its long history.
PLplot documentation at http://plplot.sourceforge.net/documentation.php.