I’ve been playing around a bit with Processing.org – a kinda-graphical programming language. One of the effects that I wanted to play with was a kind of radial transparency – a blob of color that faded out toward the edges. After playing around for a while withdrawing multiple ellipses, I settled on a pixel-based subroutine. You can also read the full report on the website
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We create a new
PGraphics object to hold the blob, then for each pixel calculate the distance from the centre as a proportion of the radius using the handy
Math.hypot() method. Then, to get nice smooth fade-outs near the edges, we invert it ...