ps_setdash

(PECL ps >= 1.1.0)

ps_setdash — Sets appearance of a dashed line

ps_setdash(resource $psdoc, float $on, float $off): bool

Sets the length of the black and white portions of a dashed line.

psdoc: Resource identifier of the postscript file as returned by ps_new().
on: The length of the dash.
off: The length of the gap between dashes.

成功时返回 true，或者在失败时返回 false。

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