411 REFERENCE · Wikibooks
MATLAB Programming/Psychtoolbox/Screen Commands/FillOval
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Usage:
Screen(windowPtr,'FillOval',[color],[rect])
Fills an ellipse with the given color, inscribed within rect.color is the clut index (scalar or [r g b] triplet) that you want to poke into each pixel; default produces white with the standard CLUT for this window's pixelSize. Default rect is whole window.