XOR (graphics Put)

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgXorGfx
• Last revised: 2023-07-09

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Parameter to the Put graphics statement which uses a bit-wise Xor as the blitting method

Syntax

` Put [ target, ] [ STEP ] ( x,y ), source [ ,( x1,y1 )-( x2,y2 ) ], Xor

`

Parameters

Xor

Required.

Description

The Xor method combines each source pixel with the corresponding destination pixel, using the bit-wise Xor function. The result of this is output as the destination pixel.

This method works in all graphics modes. There is no mask color, although color values of 0 (RGBA(0, 0, 0, 0) in full-color modes) will have no effect, because of the behavior of Xor.

In full-color modes, each component (red, green, blue and alpha) is kept in a discrete set of bits, so the operation can be made to only affect some of the channels, by making sure the all the values of the other channels are set to 0.

Examples

start GeSHi

''open a graphics window
ScreenRes 320, 200, 16

''create a sprite containing a circle
Const As Integer r = 32
Dim c As Any Ptr = ImageCreate(r * 2 + 1, r * 2 + 1, 0)
Circle c, (r, r), r, RGBA(255, 255, 255, 0), , , 1, f

''put the three sprites, overlapping each other in the middle
Put (146 - r, 108 - r), c, Xor
Put (174 - r, 108 - r), c, Xor
Put (160 - r,  84 - r), c, Xor

''free the memory used by the sprite
ImageDestroy c

''pause the program before closing
Sleep

end GeSHi

Differences from QB

• None

See also

• Xor
• Put (Graphics)

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