# ps_arcn

(PECL ps >= 1.1.0)

ps_arcn — Draws an arc clockwise

### 说明

ps_arcn ( resource `$psdoc` , float `$x` , float `$y` , float `$radius` , float `$alpha` , float `$beta` ) : bool

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 clockwise (use ps_arc() to draw counterclockwise). The subpath added to the current path starts on the arc at angle `beta` and ends on the arc at angle `alpha`.

### 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 starting 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_arc() - Draws an arc counterclockwise