[OpenLayers-Users] boundaries of lineString

[Rupesh M G]

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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Users Digest, Vol 17, Issue 13








------------------------------

Message: 8
Date: Tue, 12 Feb 2008 10:52:21 -0500
From: Tim Schaub <tschaub at openplans.org>
Subject: Re: [OpenLayers-Users] boundaries of lineString
Cc: users at openlayers.org
Message-ID: <47B1C0B5.4080006 at openplans.org>
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" <bluecarto at gmail.com>*
> 
> 02/11/2008 03:58 PM
> 
> 
> To
>                "Rupesh M G" <RupeshM at ibsplc.com>
> cc
>                users at openlayers.org
> 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 <RupeshM at ibsplc.com> 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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