
plsdrawmode: Set drawing mode (depends on
device support!) 

DESCRIPTION:

    This function is used in example 34. 

SYNOPSIS:

plsdrawmode(mode)

ARGUMENTS:

    mode (PLINT, input) :    Control variable which species the drawing
    mode (one of PL_DRAWMODE_DEFAULT, PL_DRAWMODE_REPLACE, or
    PL_DRAWMODE_XOR) to use. 
