Thanks Toby for your quick answer. obviously, I really have to do it on the mouse move (because I force the user to draw a regular polygon with only 4 sides by clicking and then dragging).
I never wrote a custom listener in OL, do you have examples or links? MartinO On Tue, Nov 22, 2011 at 11:03 AM, Toby Reinicke <[email protected]> wrote: > Hi Martin. > Have a look at http://openlayers.org/dev/examples/measure.html and look > at the immediate option. It'll work on each click, doing it on mouse move > youd have to write a mouse move listener into the draw tool and do > appropriate stuff there, > Toby > > On 22 Nov 2011, at 15:51, Martin Ouellet <[email protected]> wrote: > > > Hi all, > > > > Currently I used this piece of code to allow the user to draw a region > of interest on the map: > > > > drawControls = new OpenLayers.Control(); > > OpenLayers.Util.extend(drawControls, { > > draw: function() { > > this.box = new > OpenLayers.Handler.RegularPolygon(drawControls, > > {"done": this.notice}, {sides:4, irregular:true, > persist:true}); > > }, > > notice: function(geom) { > > // whatever you want it to do after the box has been drawn > > var feature = new OpenLayers.Feature.Vector(geom); > > layer_zone_extraction.addFeatures(feature); > > //afficher la superficie de la zone dessiné > > var bounds = getExtractBounds(); > > var ll = new OpenLayers.LonLat(bounds.left, bounds.bottom); > > var ur = new OpenLayers.LonLat(bounds.right, bounds.top); > > var superficieKm = > Math.abs(((bounds.left-bounds.right)/1000)*((bounds.top-bounds.bottom)/1000)); > > $('#message').jGrowl(superficieKm.toFixed(2) + " km²"); > > } > > }); > > > > Is it's possible to display the area value on-the-fly while the user > draw it instead of after he finished? > > > > Thanks you in advance! > > > > MartinO > > _______________________________________________ > > Users mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/openlayers-users >
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