bool cpdf_circle ( int pdf_document, float x_coor, float y_coor, float radius [, int mode] )
The cpdf_circle() function draws a circle with
center at point
(x_coor, y_coor)
and radius radius. Returns TRUE on success or FALSE on failure.
The optional parameter mode
determines the unit length. If it is 0 or omitted the default unit as specified
for the page is used. Otherwise the coordinates are measured in postscript
points disregarding the current unit.