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Table of Contents
4. Standard Units
4.37. Graph - Graph unit
4.37.2. Graph Unit Procedures and Functions
4.37.2.119. SetWriteMode procedure
4.37.2.119. SetWriteMode procedure
Targets: MS-DOS, Win32
Graph Unit
Sets the writing mode for line drawing.
Declaration:
procedure SetWriteMode(WriteMode: DWORD);
Remarks:
Each binary operation constant corresponds to a binary operation
between each byte in the line and the corresponding bytes on the screen.
CopyPut uses the assembly language MOV instruction,
overwriting the line with whatever is on the screen.
XORPut uses the XOR command to combine the line with the screen.
Two successive XOR commands will erase the line and restore the screen
to its original appearance.
SetWriteMode affects calls to the following routines only:
DrawPoly,
PutPixel,
Line,
LineRel,
LineTo,
Rectangle,
Circle,
Ellipse,
Bar3D,
PutHTextel,
PutSprite,
DrawEllipse,
Triangle and
PutImage.
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