> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> On Behalf Of Lance Dyas
> Sent: Monday, August 20, 2007 8:34 AM
> To: Chris Hardin
> Cc: [email protected]; Erik Uzureau
> Subject: Re: [OpenLayers-Users] Measure Distance? Ruler?
>
> There is accurate distance measurement using the Vincenty distance
> formula...
> Haverine is umm simulating the earth as sphere and is not accurate.
> What Open Layers lacks is a gui for measurement.
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So is there any reason that the following function won't work? I have been
using it in my app and it seems to be accurate... At least as far as I can
tell.
//Add a control,
var c =
new OpenLayers.Control.DrawFeature(vlayer,
OpenLayers.Handler.Path, {'displayClass' : 'olControlDrawFeaturePath'} );
c.featureAdded = this.measureLine;
this.addControls(c);
//function for doing measure
measureLine: function (feature){
if(this.lastFeature)
vectorLayer.eraseFeatures(this.lastFeature);
feature.state = OpenLayers.State.INSERT;
printDistance(feature.geometry.getLength());
this.lastFeature = feature;
},
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