okay, here is some outline (what I do for searching). Overview:
Create a vector layer (selectedLayer) in which drawing occurs.
Use a drawfeature control to do the drawing.
When feature added to to drawcontrol, extract the geometry, call server
with a callback to handle the response.
the code:
selectedLayer = new OpenLayers.Layer.Vector("Selected Layer", {
wrapDateLine: true,
displayOutsideMaxExtent: true,
displayInLayerSwitcher: false,
});
map.addLayer(selectedLayer); (top layer)
ctrl= new OpenLayers.Control.DrawFeature(selectedLayer,
OpenLayers.Handler.Polygon, {
geodesic: true, // stuff for managing drawing across
180 line
handlerOptions: {
citeCompliant: false
}
});
// you can use different handler other than polygon for other geometries
ctrl.events.register("featureadded", this, function (e) {
Ext.Ajax.request({ // i am using Ext, but you can use any ajax
wrapper you like
url:'mypythoncode',
method:'GET',
success:function(response){
// process the response
},
params:{
geometry:serialize(e.feature.geometry) // you need to
write serialize to your taste to format the geometry
id: new Date().getTime(); // avoid browser caching
}
});
That should get you started.
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