PDFLib provides three methods of drawing arc lengths: %pdf_circle()% -- render a circle %pdf_arc()% -- render an arclength, drawing in the counter-clockwise direction %pdf_arcn()% -- render an arclength, drawing in a clockwise direction $end_a using radius $radius (counter-clockwise) */ pdf_arc($pdf_r, PAGE_WIDTH/2, PAGE_HEIGHT/2, $radius, $start_a, $end_a); pdf_stroke($pdf_r); /* Draw an arc length from $start_a -> $end_a using radius $radius (clockwise) */ pdf_arcn($pdf_r, PAGE_WIDTH/2, PAGE_HEIGHT/2, $radius, $start_a, $end_a); pdf_stroke($pdf_r); /* Draw a circle of radius $radius */ pdf_circle($pdf_r, PAGE_WIDTH/2, PAGE_HEIGHT/2, $radius); pdf_stroke($pdf_r); ?> ]]>