MATLAB Programming/Psychtoolbox/Screen Commands/SetDrawingRegion

Usage:

Screen(windowPtr,'SetDrawingRegion',shapeSpec,[shapeFlag])

Make subsequent drawing to the window visible only if it is within the specified region. This does not apply to PutImage or CopyWindow operations. Call with rect equal to screenRect to reestablish the entire screen. Drawing outside the region is suppressed, but still takes the normal amount of time to complete.


 * If shapeFlag == 0 [default], shapeSpec is a rect, region is rectangular.
 * If shapeFlag == 1, shapeSpec is a rect, region is oval.
 * If shapeFlag == 2, shapeSpec is a point list, region is polygonal.