void cpdf_rect(int pdf document, double x-koor, double y-koor, double width, double height, int mode);The cpdf_rect() function draws a rectangle with its lower left corner at point (x-koor, y-koor). This width is set to widgth. This height is set to height.
The last optional parameter determines the unit length. If is 0 or omitted the default unit as specified for the page is used. Otherwise the koodinates are measured in postscript points disregarding the current unit.