[OpenLayers-Users] only one rectangle draw in single Map

[Phil Scadden]

You arent tell us that much what you want to do with the rectangle, but 
I am assuming that you want the lat/lon coordinates of the corners when 
drawing complete.

I would create a vector layer. eg
selectedLayer = new OpenLayers.Layer.Vector("Selected Layer", {
     wrapDateLine: true,
     displayOutsideMaxExtent: true,
     displayInLayerSwitcher: false,
});
map.addLayer(selectedLayer);

I would use DrawFeature on that selectedLayer, with a Box Handler.
eg
boxControl = new OpenLayers.Control.DrawFeature(selectedLayer, 
OpenLayers.Handler.Box,{});

I would then register a featureadded event to
             boxControl.events.register("featureadded", this, function (e) {
                // add your code here to deal with the event. 
e.feature.geometry will have to corner verticies.
               selectedLayer.destroyFeatures; // clear the vector layer 
after you are finished with it.
            }

Note that the geometry will be in the map projection. You may need to 
unproject to get lat/long.

Caveat - I havent done this with box, only with polyogin.

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