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To further generalize, I would set up the function to allow different centers and widths for each color component, which would allow us to produce a rainbow of greens-blues, for example.
[...] A little something I made for my students during today’s actionscript class. Here’s the flash source code, and here’s an article that explains the technique I use to generate those groooovy colors. [...]
Stoyen: True, but there is still a need to add the leading zero padding when producing hex digits for single digit numbers. A sprintf() function would make things much easier, since you can use “%02x” to specify a 2-digit hex number with zero-padding.