bool cpdf_arc ( int pdf_document, float x-coor, float y-coor, float radius, float start, float end [, int mode])
The cpdf_arc() function draws an arc with
center at point
(x-coor, y-coor)
and radius radius, starting at angle
start and ending at angle
end. 如果成功则返回 TRUE，失败则返回 FALSE。
cpdf_add_outline
