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/*
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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$Id: SetAoi.js 3052 2007-08-01 21:25:21Z ahocevar $
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*/
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// Ensure this object's dependancies are loaded.
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mapbuilder.loadScript(baseDir+"/widget/ButtonBase.js");
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mapbuilder.loadScript(baseDir+"/util/openlayers/OpenLayers.js");
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/**
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* Set AOI button.
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* @base ButtonBase
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* @author Andreas Hocevar andreas.hocevarATgmail.com
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* @param widgetNode The tool node from the Config XML file.
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* @param model The ButtonBar widget.
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*/
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function SetAoi(widgetNode, model) {
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ButtonBase.apply(this, new Array(widgetNode, model));
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this.cursor = 'crosshair';
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/**
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* Interactive ZoomOut control.
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* @param objRef reference to this object.
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* @return {OpenLayers.Control} class of the OL control.
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*/
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this.createControl = function(objRef) {
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var Control = OpenLayers.Class( OpenLayers.Control, {
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CLASS_NAME: 'mbControl.SetAoi',
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type: OpenLayers.Control.TYPE_TOOL,
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draw: function() {
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this.handler = new OpenLayers.Handler.Box( this,
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{done: this.aoiBox}, {keyMask: this.keyMask} );
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},
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aoiBox: function (position) {
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if (position instanceof OpenLayers.Bounds) {
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var minXY = this.map.getLonLatFromPixel(
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new OpenLayers.Pixel(position.left, position.bottom));
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var maxXY = this.map.getLonLatFromPixel(
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new OpenLayers.Pixel(position.right, position.top));
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var bounds = new OpenLayers.Bounds(minXY.lon, minXY.lat,
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maxXY.lon, maxXY.lat);
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var bboxOL = bounds.toBBOX().split(',');
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var ul = new Array(bboxOL[0],bboxOL[3]);
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var lr = new Array(bboxOL[2],bboxOL[1]);
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objRef.targetContext.setParam("aoi", new Array(ul, lr));
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objRef.drawAoiBox(objRef);
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}
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}
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});
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// adds a listener to the context to clear the AOI box when AOI changes
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this.targetContext.addListener('aoi', this.clearAoiBox, this);
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return Control;
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}
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/**
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* Draws a bounding box around the current AOI.
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* @param objRef reference to this widget
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*/
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this.drawAoiBox = function(objRef) {
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var ext = objRef.targetContext.getParam('aoi');
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var bounds = new OpenLayers.Bounds(ext[0][0], ext[1][1], ext[1][0], ext[0][1]);
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objRef.targetContext.aoiBoxLayer = new OpenLayers.Layer.Boxes('Boxes');
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objRef.targetContext.map.addLayer(objRef.targetContext.aoiBoxLayer);
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var box = new OpenLayers.Marker.Box(bounds);
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objRef.targetContext.aoiBoxLayer.addMarker(box);
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}
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/**
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* Clears the AOI box.
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* @param objRef reference to this widget
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*/
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this.clearAoiBox = function(objRef) {
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if (objRef.targetContext.aoiBoxLayer) {
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objRef.targetContext.aoiBoxLayer.destroy();
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}
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}
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}
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