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<p class=MsoNormal><span lang=EN-US>Hello,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I’m trying to build a function that
lets me draw a ‚circle‘ (40-sided polygon) and then get the
coordinates of it’s center and get it’s radius.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Drawing the circle is pretty
straightforward (I just copied the code from <a
href="http://openlayers.org/dev/examples/regular-polygons.html">http://openlayers.org/dev/examples/regular-polygons.html</a>).
Getting the Centroid and handling the sketchcomplete-event works (with Fabian’s
help: <a
href="http://osgeo-org.1803224.n2.nabble.com/Get-infos-on-newly-created-polygon-with-Draw-Feature-td5216851.html#a5216851">http://osgeo-org.1803224.n2.nabble.com/Get-infos-on-newly-created-polygon-with-Draw-Feature-td5216851.html#a5216851</a>).<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I’m still stuck with getting the radius.
I’m using a random point on the circle with<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>var aussen = new
OpenLayers.Geometry.Point(event.feature.geometry.components[0].components[0].x,event.feature.geometry.components[0].components[0].y);<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>(though I’m not sure if that’s the
best way). And try to use getGeodesicLength to get the distance (I need it in
meters/km).<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I tried this:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>function getRingCenter(event) {<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> var proj =
map.getProjectionObject();<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> var mitte =
event.feature.geometry.getCentroid();<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> var aussen = new
OpenLayers.Geometry.Point(event.feature.geometry.components[0].components[0].x,event.feature.geometry.components[0].components[0].y);<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> var line = new
OpenLayers.Geometry.LineString([mitte, aussen]);<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US> alert
(line.getGeodesicLength(proj));<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US> alert (line.getGeodesicLength(proj)*
this.map.getScale() );<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US> alert (this.map.getUnits());<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>}<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I don’t understand what I get in the
first alert, but it seems that it has to do with the current display size/zoom
level, so I tried to multiply it with getScale(). According to getUnits() the
result should bei meters – but the numbers seem to be random.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I’m a little desperate – help is
very much appreciated.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Chris<o:p></o:p></span></p>
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