[geos-devel] Exposing Precision model through C-API

[Varun Saraf]

Hi,

Below is the link to the initial draft of my proposal. Please have a look
and let me know. I have enabled comments so you can comment there itself.

https://docs.google.com/document/d/1MBGF1w5WNGuT4KSBtrT7uJRHRtfpx_J1ik03LKk9GJs/edit#

Regards,
Varun Saraf


On Mon, Mar 17, 2014 at 10:46 PM, Sean Gillies <sean.gillies at gmail.com>wrote:

> On Mon, Mar 17, 2014 at 2:31 AM, Sandro Santilli <strk at keybit.net> wrote:
>
>> On Sun, Mar 16, 2014 at 12:24:19PM -0600, Sean Gillies wrote:
>> > On Mar 12, 2014 6:46 AM, "Sandro Santilli" <strk at keybit.net> wrote:
>> >
>> > > On Wed, Mar 12, 2014 at 06:16:00AM -0400, Paul Ramsey wrote:
>> > > > I would tend to expect choosing a single precision model and working
>> > > > with it for a long time to be a more common usage than swapping
>> > > > between lots of models. My bias.
>> > >
>> > > I also find this to be a more likely usecase.
>> >
>> > While agree that one model at a time (and two at the most) is the most
>> > likely use case, I'm concerned about designs that limit the number. I'm
>> > also reversing myself on whether there should be a precision model in
>> the
>> > global context. I'd rather GEOS did not add more global state.
>> >
>> > Please see the wiki page
>> > http://trac.osgeo.org/geos/wiki/GSoC/CAPI_PrecisionModel for my
>> (Shapely)
>> > requirements.
>>
>> So what would you think about "parking" a pointer to the client-owned
>> GeometryFactory into the "context" right before calling the geometry
>> creation functions ? Such "parking" method would return the old
>> GeometryFactory, so that you can pass it back. You'd only own the
>> GeometryFactory objects you'd have explicitly created.
>>
>> I'm talking about GeometryFactory rather than PrecisionModel because
>> the object referenced  by geometries is really a GeometryFactory,
>> not a PrecisionModel. A GeometryFactory also references a
>> CoordinateSequenceFactory.
>>
>
> Sounds practical. Geometry objects will have to park their factories
> before every operation, right? Offloading complexity to client code seems
> fair enough.
>
> I've updated my wiki notes to refer to geometry factories instead of
> models.
>
>
> --
> Sean Gillies
>
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