Links added with one of the functions ps_add_weblink(), ps_add_pdflink(), etc. will be displayed with a surounded rectangle when the postscript document is converted to pdf and viewed in a pdf viewer. This rectangle is not visible in the postscript document. This function sets the color of the rectangle's border line.
Resource identifier of the postscript file as returned by ps_new().
The red component of the border color.
The green component of the border color.
The blue component of the border color.