[geos-devel] Buffering Multipolygons

[strk at refractions.net]

On Wed, May 18, 2005 at 09:08:23AM -0400, dblasby at openplans.org wrote:
> buffering this in JUMP (using JTS), works fine.
> 
> -->
> MULTIPOLYGON (((10 10, 10 20, 20 20, 20 15, 10 10)),
>   ((60 60, 70 7, 80 60, 60 60)))
> 
> strk; your result is not correct.  You've lost the 1st polygon!

You're right! I've verified geos-1.0.0 not having this problem.
I'll check out 2.0.0 and up and see what broke this.
I'll add a test in testLeaksBig.xml for this as well.
Following is the XML test (parametrized buffer argument will only work
with GEOS CVS, other versions will use 10 as argument instead of arg3):

<run>
  <precisionModel type="FLOATING"/>


<case>
  <desc>Multipolygon buffering</desc>
  <a>MULTIPOLYGON (((10 10, 10 20, 20 20, 20 15, 10 10)), ((60 60, 70 7, 80 60, 60 60)))</a>
<test>
  <op name="buffer" arg1="a" arg3="0">
  	MULTIPOLYGON (((10 10, 10 20, 20 20, 20 15, 10 10)), ((60 60, 70 7, 80 60, 60 60)))
  </op>
</test>
</case>


</run>


--strk;