Join GitHub today
GitHub is home to over 28 million developers working together to host and review code, manage projects, and build software together.Sign up
Issue rendering compound polygons (PostGIS) #5012
It has for sure taken too long without any feed back for you but as least for me it was not very easy to install the test data. For some reason the backup file was not recognized by my pgAdmin and I had to run the SQL commands by hand, as well as to save the data section into text file for importing it with COPY. I would have appreciated also a section of mapfile.
Anyway, I could reproduce the issue with Mapserver 7.0 and I can also see some full circles on the map. Next step would be to get one such geometry into a cage.
I was also able to reproduce the problem with a simple feature - kind of oval - formed by 2 circular strings and 2 lines.
When the distance between the points of the circular strings is sufficiently big the feature is drawn correctly by mapserver, but when it comes to cm or mm ranges the curves are completely wrong:
The problem can be solved by patching arcCircleCenter in mappostgis.c with the solution proposed by PostGIS (https://trac.osgeo.org/postgis/ticket/3099).