(PHP 3>= 3.0.8, PHP 4 , PHP 5)
The cpdf_setlinecap() function set the linecap parameter between a value of 0 and 2. 0 = butt end, 1 = round, 2 = projecting square. 如果成功则返回 TRUE，失败则返回 FALSE。
cpdf_setgray
