[OpenLayers-Users] display on-the-fly area while drawing a region on the map?

[Martin Ouellet]

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 <ramotswa at gmail.com> 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 <geomartino at gmail.com> 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
> > Users at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/openlayers-users
>
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