Draws an arc counterclockwise

说明

bool ps_arc ( resource $psdoc , float $x , float $y , float $radius , float $alpha , float $beta )

Draws a portion of a circle with at middle point at (x, y). The arc starts at an angle of alpha and ends at an angle of beta. It is drawn counterclockwise (use ps_arcn() to draw clockwise). The subpath added to the current path starts on the arc at angle alpha and ends on the arc at angle beta.

参数

psdoc: Resource identifier of the postscript file as returned by ps_new().
x: The x-coordinate of the circle's middle point.
y: The y-coordinate of the circle's middle point.
radius: The radius of the circle
alpha: The start angle given in degrees.
beta: The end angle given in degrees.

返回值

成功时返回 TRUE，或者在失败时返回 FALSE.

参见

ps_arcn() - Draws an arc clockwise