[OpenLayers-Users] draw Polygon from script

[Frédéric Junod]

Le Tue, 11 Sep 2007 14:55:37 +0200,
Kevin Kempfer <mail at kevinkempfer.de> a écrit :

> What I am doing so far is this:
> 
> var p1 = new OpenLayers.Geometry.Point(8.4,41.3)
> var p2 = new OpenLayers.Geometry.Point(8.4,42.3)
> var p3 = new OpenLayers.Geometry.Point(9.4,42.3)
> var p4 = new OpenLayers.Geometry.Point(9.4,41.3)
> 
> var poly = new OpenLayers.Geometry.LinearRing(new Array(p1,p2,p3,p4));
> var control = drawControls['polygon'];
> control.drawFeature(poly);
> 
> Is this the correct way of adding a polygon to the map?

To add points to the map you need to:
 1. create a OpenLayers.Layer.Vector and add it to the map
 2. create OpenLayers.Geometry.Point and OpenLayers.Feature.Vector
 3. bind Geometry and Vector Feature
 4. add Vector Feature to the Vector Layer


very basic js code:

var map = new OpenLayers.Map('map');
var layer = new OpenLayers.Layer.Vector('my points');

map.addLayer(layer);

var features = [];
for (var i=0, i < myPointsFromAjax.length; i++) {
  var geom = new OpenLayers.Geometry.Point(myPointsFromAjax[i].x,
                                           myPointsFromAjax[i].y);
  features.push(new OpenLayers.Feature.Vector(geom));
}
layer.addFeatures(features);


or something like that ...

Now you need to digg into http://www.openlayers.org/dev/examples/ and look at
the source code, especially resize-features.html

Hope that helps,

fredj


> 
> Thanks,
> 
> Kevin.
> 
> 
> Kevin Kempfer schrieb:
> > Hi,
> > 
> > I receive some points from a database via AJAX and would like to add 
> > them to the map as new polygon. Where should my script jump in? Call the 
> > DrawFeature-Handler? Can someone please give me a direction on where to 
> > start?
> > 
> > Thanks,
> > 
> > Kevin.
> > 
> > 
> > ------------------------------------------------------------------------
> > 
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> > http://openlayers.org/mailman/listinfo/users
> 


-- 
Frédéric Junod
Camptocamp SA