(PECL ps >= 1.1.0)
ps_setlinejoin — Sets how contected lines are joined
$psdoc, int $type): boolSets how lines are joined.
psdocResource identifier of the postscript file as returned by ps_new().
type
The way lines are joined. Possible values are
PS_LINEJOIN_MITER,
PS_LINEJOIN_ROUND, or
PS_LINEJOIN_BEVEL.
成功时返回 true， 或者在失败时返回 false。