(PECL ps >= 1.1.0)
ps_setlinejoin — Sets how contected lines are joined
Sets how lines are joined.
Resource identifier of the postscript file as returned by ps_new().
The way lines are joined. Possible values are PS_LINEJOIN_MITER, PS_LINEJOIN_ROUND, or PS_LINEJOIN_BEVEL.
如果成功则返回 TRUE，失败则返回 FALSE。