Re: [Lib2geom-devel] Question about the lib2geom coordinate system.

[Sunburned S. <sun...@gm...>]

I understand now that every geometry in lib2geom maintains its own
"coordinate system". I am curious how this will work with the spatial index.
For a spatial index to work won't I need to have geometries on a common
coordinate system?

Perhaps this is a foolish question.

Scott


On 4/16/07, mgsloan <mg...@gm...> wrote:
>
> On 4/16/07, MenTaLguY <me...@ry...> wrote:
> >
> > On Mon, 16 Apr 2007 14:04:46 -0700, "Sunburned Surveyor" <
> > sun...@gm...> wrote:
> > > I know that SVG uses a coordinate system in which the "X" or
> > "northing"
> > > coordinate value increases as you move "down" the screen or page. Is
> > this
> > > the coordinate system that lib2geom uses, or does the library employ a
> > > more typical coordinate system in which the "X" or "northing"
> > coordinate value
> > > decreases as you move "down" the screen or page.
> > >
> > > If lib2geom does not use the SVG coordinate system, does it provide
> > code
> > > to do the translation?
> >
> > The short answer is that (ideally) nothing in lib2geom really
> > cares.  The ultimate interpretation of the coordinate system is up to the
> > client.
> >
>
> Yeah, I've gotten in trouble for making methods like cw (clockwise) and
> ccw (counter-clockwise) before, as these would imply a particular coordinate
> system (or at least, the desired behavior varies depending on your view of
> the coord sys).
>
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