(PECL ps >= 1.1.0)
ps_setlinejoin — Sets how contected 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.