Set the position for the next text output. You may alternatively set the x and y value separately by calling ps_set_value and choosing textx respectively texty as the value name.
If you want to output text at a certain position it is more convenient to use ps_show_xy instead of setting the text position and calling ps_show.
Resource identifier of the postscript file as returned by ps_new.
x-coordinate of the new text position.
y-coordinate of the new text position.
Returns true on success or false on failure.