Thanks Robert!
I'm looking at it right now, seems to make sense, I'll try to get the pieces
to work on my end.
I'll let you know how it goes.
-Josh
Robert Sanson wrote:
>
> Hi Josh
>
>
>
> I have a web site that reads in JSON to create a layer of crops. This
> layer can be modified. I then write out the geometry of the selected
> features. Here are the code snippets:
>
>
>
> //declare the format
>
> var geojson_format = new OpenLayers.Format.GeoJSON();
>
>
>
> //add the layer
>
> crops = new OpenLayers.Layer.Vector("Crop areas",
>
> {isBaseLayer: false,
>
> style: crop_style,
>
> extractAttributes: true });
>
>
> crops.addFeatures(geojson_format.read(cropsresponse.responseText));
>
> map.addLayer(crops);
>
> map.zoomToExtent(crops.getDataExtent());
>
>
>
> //Select, Draw and Modify controls - these are specific to the layer
>
> controls = {
>
> select: new OpenLayers.Control.SelectFeature(crops,
> {callbacks: {'over':feature_info}}),
>
> dpolygon: new
> OpenLayers.Control.DrawFeature(crops,OpenLayers.Handler.Polygon),
>
> modify: new OpenLayers.Control.ModifyFeature(crops),
>
> delf: new OpenLayers.Control.SelectFeature(crops,
> {onSelect: function(feature) {crops.destroyFeatures([feature])}})
>
> //delf: new OpenLayers.Control.SelectFeature(crops,
> {onSelect: function(feature)
> {feature.geometry.destroy();crops.eraseFeatures([feature])}})
>
> };
>
> for(var key in controls) {
>
> map.addControl(controls[key]);
>
> }
>
> }
>
>
>
> //write out the geometry into a div
>
> function feature_info(feature) {
>
> var html = "<ul>";
>
> OpenLayers.Util.getElement('crop').innerHTML =
> "<strong>ID:</strong>" + feature.attributes.prop0 + "
> <strong>Area:</strong>" + (Math.round(feature.geometry.getArea() / 100) /
> 100).toString() + " Ha";
>
> var json = geojson_format.write(feature);
>
> json = json.replace(/,/g, ', ');
>
> document.getElementById('comments').innerHTML = json;
>
> }
>
> Hope that gives you some starters.
>
>
>
> regards,
>
>
>
> Robert S.
>
>
>
>>>> "Josh S." <[email protected]> 23/05/2009 5:07 a.m. >>>
>
>
>
> I need to export the geometries of multiple polygons a user draws, my plan
> is
>
> to use json to export the geometries to another .js I'm using. Any
>
> tips/help/code would be great.
>
>
>
> -Josh
>
> --
>
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>
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>
>
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