Boost C++ Libraries: Ticket #10049: Error in polygon set shrink

attachment set

Tue, 13 May 2014 12:27:18 GMT

attachment → shrink.png

red=input, green=result (shrink by 1000)

attachment set

Tue, 13 May 2014 12:28:26 GMT

attachment → shrink.cpp

Tue, 13 May 2014 12:29:49 GMT

I compile the attached code with:

clang++ -I <path to boost>/boost_1_55_0 -std=c++11 shrink.cpp

on mac osx maverics.

Tue, 13 May 2014 12:48:51 GMT

Correction: The attach example should not give a triangle as the shrink result - rather an empty result. However, reducing the shrink to 750 instead of should give a triangle but it produces a result similar to the attached image. Both cases are wrong (unless I am violating some input constraint that I am unaware of).

owner changed

Andrii Sydorchuk — Wed, 21 May 2014 21:38:56 GMT

owner changed from Lucanus Simonson to Andrii Sydorchuk

Andrii Sydorchuk — Wed, 21 May 2014 21:40:48 GMT

Hi Jakob,

Thank you for your report and the attached image. I am going to investigate the issue.

status changed; resolution set

Andrii Sydorchuk — Thu, 29 May 2014 22:02:32 GMT

status new → closed
resolution → duplicate

Jakob,

The resizing (bloat, shrink) operation implementation is seriously broken. This is a known issue and am going to mark this as duplicate of "Ticket #6063". There is no explicit timeline for the issue to be fixed at the moment.

Fri, 30 May 2014 17:39:14 GMT

If these functions are known to be "seriously broken" would it not be better to remove them? Or mention the issue in the documentation?

Fri, 30 May 2014 17:47:47 GMT

(by the way boost::polygon is extremely cool and amazing!)

Andrii Sydorchuk — Sat, 31 May 2014 09:29:16 GMT

Thanks!

Andrii Sydorchuk — Sat, 31 May 2014 09:30:12 GMT

I will update documentation accordingly.