forlang.hlp (Table of Contents; Topic list)
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setwritemode
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     The setwritemode function sets the current logical write mode,
     which is used when drawing lines with the lineto, polygon, and
     rectangle functions.
 
     The <action> argument defines the write mode. The possible values
     are $GAND, $GOR, $GPRESET, $GPSET, and $GXOR.
 
     Return Value
 
     The function returns the previous write mode if successful, or -1
     if it fails.
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