411 REFERENCE · Wikibooks
MATLAB Programming/Psychtoolbox/Screen Commands/FrameArc
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Usage:
Screen(windowPtr,'FrameArc',[color],[rect],startAngle,arcAngle,[penWidth],[penHeight],[penMode])
Draw an 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. Default pen size is 1,1. Angles are measured in degrees, clockwise from vertical.