Re: [boost] [GTL] - geometric template library - determininginterest

From: Joel de Guzman (joel_at_[hidden])
Date: 2007-10-03 19:10:25

Suto, Gyuszi wrote:
> Michael Marcin wrote:
>> Suto, Gyuszi wrote:
>>> The biggest issue is agreeing on fixed vs. floating precision.
>>>
>> If it's going to be a template library why not both?
>>
>> I personally need fixed-point but I can easily see situations where
>> using floating-point would be beneficial.
> 
> The floating point has high resolution near zero and very low resolution
> 
> at high values. My worry is that once you start moving, creating,
> intersecting
> shapes/lines at high values, you may not have a floating point value
> available for that coordinate. Then you snap to nearest, in which case 
> your parallels are not parallel any more, your collinears are not 
> collinear any more, etc. There are many problems with floating points.
> Maybe infinite precision, maybe rational numbers will work. I'm sure 
> some of the readers of this thread have more experience with that
> regards
> Gyuszi

Ok, but then again, there are also problems with fixed point.
So, again, why does the library have to choose and not the
user, since we have templates?

Regards,
-- 
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net