Hi,
Could you please tell me how to buffer a lineString, and get the
vertices of a polygon from it?
Thanks & Regards,
Rupesh
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02/12/2008 09:34 PM
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Subject
Users Digest, Vol 17, Issue 13
------------------------------
Message: 8
Date: Tue, 12 Feb 2008 10:52:21 -0500
From: Tim Schaub <[EMAIL PROTECTED]>
Subject: Re: [OpenLayers-Users] boundaries of lineString
Cc: [email protected]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hey-
Rupesh M G wrote:
>
> Thank you for the reply. But I think it is not correct.
>
> For example, if I draw the linestring with 4 points, I'm able to see a
> polygon with 8 vertices.
A linestring geometry with 4 points has 4 points. When you see it
rendered, it looks like a polygon to you, but the geometry is just a
linestring.
It sounds like you're talking about buffering a geometry. When you
buffer a linestring geometry, you get a polygon geometry.
Tim
>
> But if I print the components.length of the linestring, it just says 4.
>
> I tried it with the example in the url
> http://openlayers.org/dev/examples/vector-features.html
>
>
> Regards,
> Rupesh
>
>
>
> *"Pierre GIRAUD" <[EMAIL PROTECTED]>*
>
> 02/11/2008 03:58 PM
>
>
> To
> "Rupesh M G" <[EMAIL PROTECTED]>
> cc
> [email protected]
> Subject
> Re: [OpenLayers-Users] boundaries of lineString
>
>
>
>
>
>
>
>
> It should be quite easy because geometry like lineString and Polygon
> are composite geometries.
> For example, a OpenLayers.LineString has a 'components' property which
> is an array of OpenLayers.Points.
> That way, you can get all the vertices using a loop like following :
>
> for(var i=0; i <= thelinestring.components.length; i++) {
> // do something with thelinestring.components[i] which is an OL point
> }
>
> Regards,
> Pierre
>
> On Feb 11, 2008 9:02 AM, Rupesh M G <[EMAIL PROTECTED]> wrote:
> >
> > Hi,
> >
> > I'm working on an application about roads. There I need to
mark a
> > part of the road, and execute some query.
> >
> > My user will click a set of points to form a sequence of lines
passing
> > through the center of the road, because there can be bends in the
road.
> >
> > I plan to draw a lineString going through these points. Using a
bigger
> > strokeWidth, I can show it like a road (or like a filled polygon).
> >
> > Is there any way to get the vertices of that polygon?
> >
> >
> > Thanks & Regards,
> > Rupesh
> >
> >
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