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SetWriteMode procedure
DECLARATION: SetWriteMode(WriteMode : Integer)
PURPOSE: Sets the write mode for line drawing
UNIT: Graph
REMARKS: The parameter, WriteMode can be one of the constants
declared in the Graph Unit:
Const
CopyPut = 0; { MOV }
XORPut = 1; { XOR }
These constants correspond to a binary operation between
each byte in the line and the corresponding byte on the screen.
CopyPut uses the assembly language MOV instruction which
places the line on the screen overwriting anything that was
previously in the same place.
XORPut uses the assembly language XOR instruction to combine
the line with whatever is on the screen. Two successive
XORPut calls will erase the line and return the screen to
its original state.
RESTRICTIONS: Must first be in graphics mode.
See Also:
PutImage
SetLineStyle
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