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/*
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License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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$Id: ZoomOut.js 3894 2008-02-29 18:37:09Z 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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* Zoom Out 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 ZoomOut(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.ZoomOut',
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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.zoomBox}, {keyMask: this.keyMask} );
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},
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zoomBox: function (position) {
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if (position instanceof OpenLayers.Bounds) {
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var minXY = new OpenLayers.Pixel(position.left, position.bottom);
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var maxXY = new OpenLayers.Pixel(position.right, position.top);
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var bounds = new OpenLayers.Bounds(minXY.x, minXY.y,
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maxXY.x, maxXY.y);
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var mapSize = (this.map.getSize().w+this.map.getSize().h)/2;
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var boxSize = (Math.abs(bounds.getWidth())+Math.abs(bounds.getHeight()))/2;
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var newScale = this.map.getScale()*(mapSize/boxSize);
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this.map.setCenter(bounds.getCenterLonLat());
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this.map.zoomToScale(newScale);
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} else { // it's a pixel
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this.map.setCenter(this.map.getLonLatFromPixel(position),
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parseInt(this.map.getZoom() - 1));
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}
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}
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});
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return Control;
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}
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}
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