Screen(‘FillArc’)
Psychtoolbox>Screen.{mex*} subfunction
Screen(‘FillArc’,windowPtr,[color],[rect],startAngle,arcAngle)
Draw a filled arc inscribed within the rect. ‘color’ is the clut index (scalar
or [r g b a] 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.