894 Appendix A: Functions and Instructions
XorPic CATALOG
XorPic
picVar
[,
row
] [,
column
]
Displays the picture stored in
picVar
on the current
Graph screen.
Uses
xor logic for each pixel. Only those pixel
positions that are exclusive to either the screen or
the picture are turned on. This instruction turns
off pixels that are turned on in both images.
picVar
must contain a pic data type.
row
and
column
, if included, specify the pixel
coordinates for the upper left corner of the
picture. Defaults are (0, 0).