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Specify binary operation to perform when drawing on screen
Source position: graphh.inc line 754
| 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 pre-defined constants:
None.
| 
 | Set foreground drawing color | |
| 
 | Set background drawing color | |
| 
 | Set line drawing style | |
| 
 | Set drawing fill style |