Specify binary operation to perform when drawing on screen.
Source position: graphh.inc line 760
procedure SetWriteMode(  | 
WriteMode: SmallInt  | 
);  | 
SetWriteMode controls the drawing of lines on the screen. It controls the binary operation used when drawing lines on the screen. Mode can be one of the following predefined constants:
None.
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Set foreground drawing color.  | 
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Set background drawing color.  | 
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Set line drawing style.  | 
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Set drawing fill style.  |