I use the control below to allow my users to draw a "bounding box" on a
map that uses the Google layers.
The problem arises when they draw a shape that crosses the dateline, as
it creates a shape longitudly inverse to what they wanted.
Any suggestions as to the best way to handle this?
[javascript]
//bbox
_bboxDrawControl = new OpenLayers.Control({
draw: function () {
this.box = new OpenLayers.Handler.Box( _bboxDrawControl,{
done: this.notice
},{});
this.box.boxDivClassName = 'Control_DrawBox';
},
notice: function (bounds){
this.box.deactivate();
var newbounds = new OpenLayers.Bounds();
newbounds.extend(_map.getLonLatFromPixel(new
OpenLayers.Pixel(bounds.left, bounds.bottom)));
newbounds.extend(_map.getLonLatFromPixel(new
OpenLayers.Pixel(bounds.right, bounds.top)));
var bbox = new
OpenLayers.Feature.Vector(newbounds.toGeometry());
bbox.id = 'SW_customBoundingBox';
_bboxLayer.addFeatures(bbox);
_map.zoomToExtent(newbounds);
}
});
_map.addControl(_bboxDrawControl);
[end javascript]
I could snip the shape off entirely at the dateline, but id like to
avoid that.
I could cut it in half and create two shapes, but while producing a more
accurate result it would render on different sides of the map,
and if its not coherent its not very user friendly.
A third option would be to force the draw control to be unable to cross
the date line,
but I don't have any idea how to accomplish that.
Ultimately id like one shape(or look like one) that truly represents the
shape drawn.
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