[OpenLayers-Users] RegularPolygon radius document questions

[Grégory COLLIN]

I think the units is global. I don't think you can change that on the
fly, however, if we supposed you set up 'm' as units on your map, you
can set your radius size to 4000 to have 4KM.

See the code below :

   var map = new OpenLayers.Map({
        div: "map",
        theme: null,
        units: 'm',
        projection: "EPSG:900913",
  });
  var thepoint = new
  OpenLayers.Geometry.Point(longitude,latitude).transform(this.projTo,this.projFrom);
  var poly     = new
  OpenLayers.Geometry.Polygon.createRegularPolygon(thepoint,4000,6,0);

This code sample is for drawing a polygon, since this is what i do.
However you will find easily how to draw a circle :)

Hope it answer to your question !


 Le
Tue, 29 Jan 2013 09:18:02 +0100, 杨华杰 <yhjhoo at gmail.com> a écrit :

> eg. I want to draw a circle on the map, the radius is 4KM.
> 
> 
> On Tue, Jan 29, 2013 at 4:11 PM, 杨华杰
> <yhjhoo at gmail.com<mailto:yhjhoo at gmail.com>> wrote: can set up it
> individual? This is a global setting.
> 
> 
> On Mon, Jan 28, 2013 at 6:45 PM, 杨华杰
> <yhjhoo at gmail.com<mailto:yhjhoo at gmail.com>> wrote: nice, thank you
> very much, it help me a lot
> 
> 
> On Mon, Jan 28, 2013 at 4:38 PM, Grégory COLLIN
> <gcollin at v3d.fr<mailto:gcollin at v3d.fr>> wrote: Le Mon, 28 Jan 2013
> 08:15:48 +0100, 杨华杰 <yhjhoo at gmail.com<mailto:yhjhoo at gmail.com>> a
> écrit :
> 
> > Hi
> >
> > I have a question about the document.
> >
> > Here is the URL:
> > http://dev.openlayers.org/docs/files/OpenLayers/Handler/RegularPolygon-js.html#OpenLayers.Handler.RegularPolygon.setOptions
> >
> >
> >
> > The
> > radius<http://dev.openlayers.org/docs/files/OpenLayers/Handler/RegularPolygon-js.html#OpenLayers.Handler.RegularPolygon.radius>
> > explain as {Float} Optional radius in map units of the regular
> > polygon.
> >
> >
> > What's the unit? kilometer/meter/mile/NM?
> >
> >
> > Regards,
> > Hua Jie
> 
> Hi Hua Jie,
> 
> The units requested could be defined in the map object.
> 
> So here is the code sample i used :
> 
>   var map = new OpenLayers.Map({
>        div: "map",
>        theme: null,
>        units: 'm',
>        projection: "EPSG:900913",
>        controls: [
>          new OpenLayers.Control.Navigation({zoomWheelEnabled: false}),
>          new OpenLayers.Control.NavToolbar({zoomWheelEnabled: false}),
>          new OpenLayers.Control.PanZoomBar(),
>          new OpenLayers.Control.ScaleLine()]
>     });
> 
> 
> So you can add the unit you want in this constructor.
> according to the documentation :
> http://dev.openlayers.org/releases/OpenLayers-2.6/doc/apidocs/files/OpenLayers/Map-js.html#OpenLayers.Map.units
> 
> you can specify : ‘degrees’ (or ‘dd’), ‘m’, ‘ft’, ‘km’, ‘mi’,
> ‘inches’.
> 
> Enjoy,
> 
> Best regards.
> 
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> 
>