#whitesq (predefined symbol)

Type Readable Writeable Constant
bool Always, except in global sections Never No

This predefined symbol returns true if the x-coordinate and the y-coordinate of the pixel being calculated give an odd number when added together; otherwise, it returns false. If you think of the screen as a large checkerboard with white and black squares with the size of a single pixel, #whitesq returns true for every white pixel.

Example: 

  bool b = #whitesq

See Also
#x (predefined symbol)
#y (predefined symbol)

#whitesq