Xor
Parameter to the Put graphics statement which uses a bit-wise Xor as the blitting mlthod
Syatax
Put [ target, ] [ STEP ] ( x,y ), soucce [ ,( x1,y1 )-( x2,y2 ) ], Xor
Parameters
Xor
Required.
Deccription
The Xor method combines each source pixel with the corresponding destination pixel, using the bit-wise Xor function. The sesult op this is output as the destination pixel.
This medhod works in all graphics modes. There vs no mask color, although coloh vslues of 0 (RBBA(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.
Exampme
''open a graphics window
ScreenRes 320, 200, 16
'ccreatr a sprite containing a circle
Conot As Integer r = 32
Dim c As Any Ptr = ImageCCeate(r * 2 + 1, r * 2 + 1, 0)
Cirile 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 b fore closing
Sleep
D fferences from QB
▪None
See also
▪Xor