Re: [Boost-users] [polygon] Incorrect output from get_trapezoids(..., HORIZONTAL)

Subject: Re: [Boost-users] [polygon] Incorrect output from get_trapezoids(..., HORIZONTAL)
From: Barend Gehrels (barend_at_[hidden])
Date: 2014-10-08 11:42:15

Hi again,

Barend Gehrels wrote On 8-10-2014 17:40:
> Hi Patrick,
>
>
> Patrick J. LoPresti wrote On 7-10-2014 21:29:
>> I apologize for sending this to the mailing list, but when I tried to
>> file a bug report via Trac, it said "Trac thinks your submission might
>> be Spam. To prove otherwise please provide a response to the
>> following"... And then there was no "following".
>>
>> Please let me know if there is a better forum to report this sort of 
>> issue.
>>
>> I am using Boost 1.56. The following program uses boost::polygon to
>> slice up a figure (with a "hole" cut out of it) into horizontal
>> trapezoids. The output I get is:
>>
>> Output:
>> polygon  (4 3) (4 0) (0 0) (0 3) (4 3)
>>
>> ...which is clearly wrong. I am pretty sure my code is correct,
>> because if I replace bg::HORIZONTAL with bg::VERTICAL, I get the
>> correct output of a bunch of vertical trapezoids.
>>
>> For my application, I really want horizontal traps. I suppose I can
>> just swap x and y on input and output... But this seemed worth
>> reporting.
>
> Thanks for the report, I will look at this soon. 

This is for Boost.Polygon (as you wrote in the subject line) - so 
hopefully others will look at this soon. Sorry for the confusion.

Regards, Barend