(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。