MATLAB Programming/Psychtoolbox/Screen Commands/DrawText
[newX,newY] = Screen(windowPtr,'DrawText',text,[x],[y],[color])
Draw text. text may include two-byte characters (e.g. Chinese). Default x y is current pen location. 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. newX,newY return the final pen location.