The usual way that this is done is by using the clip:
g.setColor(bgcolor);
g.fill/draw(the shape);
g.clipRect(0, 0, progressdistance, height);
g.setColor(progresscolor);
g.fill/draw(the shape);
For the purposes of the graphic you posted a link to, you would draw it
once at the beginning unclipped, and then do the fills on top of it -
one unclipped to do the background, and the other clipped to do the
foreground/progress indication...
...jim
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