MATLAB Programming/Psychtoolbox/Screen Commands/FillArc
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Usage:
Screen(windowPtr,'FillArc',[color],[rect],startAngle,arcAngle)
Draw a filled arc inscribed within the rect. color is the clut index (scalar or [r g b] triplet) that you want to poke into each pixel; default produces black with the standard CLUT for this window's pixelSize. Default rect is entire window. Angles are measured clockwise from vertical.