from preamble:
"Change Set: alphaRules-bf Date: 28 October 2003 Author: Bert Freudenberg
Readability fix: Uses symbolic constants instead of numbers to denote alpha blend rules. Otherwise, Form>>paintAlpha and Form>>blendAlpha would appear unused, when in fact, they are."!
It would be good to do a real fight against all the magic numbers that populate the Squeak world...Anyway this one is a good start.
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