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BitBlt example
Last updated at 11:04 am UTC on 11 March 2017
BitBlt example:

The following (somewhat artificial) code copies
a square area (0 @ 0 to 100 @ 100)
from the display onto another area on the display.

    destForm: Display 
    sourceForm: Display 
    halftoneForm: nil
    combinationRule: Form over
    destOrigin: 120@120 
    sourceOrigin: 0@0 
    extent: 100@100 
    clipRect: Display computeBoundingBox

See also:
Pixel access starts at zero