[OpenLayers-Users] Measure Distance? Ruler?

[Lee Keel]

> -----Original Message-----
> From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
> On Behalf Of Lance Dyas
> Sent: Monday, August 20, 2007 8:34 AM
> To: Chris Hardin
> Cc: users at openlayers.org; 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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