[OpenLayers-Users] Display Radius When Creating Circle with DrawFeature

Tue Jan 22 06:41:32 PST 2013

Rich,

That is exactly what I am looking for. I am also now using getLength() to
give me the length of the resultant linestring in metres which is my map
coordinate system. Perfect.

Many thanks. Much appreciated.

Regards,

Donald

From: Richard Greenwood [mailto:richard.greenwood at gmail.com] 

Sent: 22 January 2013 02:02

To: Donald Kerr

Cc: OpenLayers

Subject: Re: [OpenLayers-Users] Display Radius When Creating Circle with
DrawFeature

On Wed, Jan 16, 2013 at 3:24 PM, Donald Kerr <donald.kerr at dkerr.co.uk>
wrote:

Any takers? Help greatly appreciated.

From: openlayers-users-bounces at lists.osgeo.org
[mailto:openlayers-users-bounces at lists.osgeo.org] On Behalf Of Donald Kerr

Sent: 15 January 2013 08:14

To: openlayers-users at lists.osgeo.org

Subject: [OpenLayers-Users] Display Radius When Creating Circle with
DrawFeature

Using the following code,

      myLayer = new OpenLayers.Layer.Vector("My Layer");

      myCtrlCirc = new OpenLayers.Control.DrawFeature(

            myLayer,

            OpenLayers.Handler.RegularPolygon,

            {handlerOptions: {sides: 40}}

            );

I am creating a circle (40 sided polygon) by mousing down on the map,
dragging the mousing up. After mouseup, the polygon is added to the layer as
a vector feature. This allows me to see the size of the circle as I am
drawing it.

Is there a way to display the radius of the circle in a div as it is being
created? "sketchmodified" does not seem to get fired and I cannot think of a
way to get this to work.

I ended up modifying the the OpenLayers RegularPolygon.js to do this,
although I imagine that a better JS programmers than myself might be able to
extend the method or do something more elegant. In the move: function just
before this.modifyGeometry() I added this:

        if (typeof(displayRadius)==='function') {

          displayRadius(new OpenLayers.Geometry.LineString([this.origin,
point]));

        } 

displayRadius() is my function that formats the radius to appropriate units
and displays it in a div.

HTH,

Rich

-- 

Richard Greenwood

richard.greenwood at gmail.com

www.greenwoodmap.com 

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From: Richard Greenwood [mailto:richard.greenwood at gmail.com] 
Sent: 22 January 2013 02:02
To: Donald Kerr
Cc: OpenLayers
Subject: Re: [OpenLayers-Users] Display Radius When Creating Circle with
DrawFeature