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plsdrawmode - Set drawing mode (depends on device support!)
Set drawing mode. Note only one device driver (cairo) currently supports this at the moment. See also plgdrawmode(3plplot). Redacted form: plsdrawmode(mode) This function is used in example 34.
mode (PLINT, input) Control variable which species the drawing mode (one of PL_DRAWMODE_DEFAULT, PL_DRAWMODE_REPLACE, or PL_DRAWMODE_XOR) to use.
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. February, 2016 PLSDRAWMODE(3plplot)