| /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for | |
| * full list of contributors). Published under the Clear BSD license. | |
| * See http://svn.openlayers.org/trunk/openlayers/license.txt for the | |
| * full text of the license. */ | |
| /** | |
| * @requires OpenLayers/Control.js | |
| * @requires OpenLayers/Handler/Box.js | |
| */ | |
| /** | |
| * Class: OpenLayers.Control.ZoomBox | |
| * The ZoomBox control enables zooming directly to a given extent, by drawing | |
| * a box on the map. The box is drawn by holding down shift, whilst dragging | |
| * the mouse. | |
| * | |
| * Inherits from: | |
| * - <OpenLayers.Control> | |
| */ | |
| OpenLayers.Control.ZoomBox = OpenLayers.Class(OpenLayers.Control, { | |
| /** | |
| * Property: type | |
| * {OpenLayers.Control.TYPE} | |
| */ | |
| type: OpenLayers.Control.TYPE_TOOL, | |
| /** | |
| * Property: out | |
| * {Boolean} Should the control be used for zooming out? | |
| */ | |
| out: false, | |
| /** | |
| * Property: alwaysZoom | |
| * {Boolean} Always zoom in/out, when box drawed | |
| */ | |
| alwaysZoom: false, | |
| /** | |
| * Method: draw | |
| */ | |
| draw: function() { | |
| this.handler = new OpenLayers.Handler.Box( this, | |
| {done: this.zoomBox}, {keyMask: this.keyMask} ); | |
| }, | |
| /** | |
| * Method: zoomBox | |
| * | |
| * Parameters: | |
| * position - {<OpenLayers.Bounds>} or {<OpenLayers.Pixel>} | |
| */ | |
| zoomBox: function (position) { | |
| if (position instanceof OpenLayers.Bounds) { | |
| var bounds; | |
| if (!this.out) { | |
| var minXY = this.map.getLonLatFromPixel( | |
| new OpenLayers.Pixel(position.left, position.bottom)); | |
| var maxXY = this.map.getLonLatFromPixel( | |
| new OpenLayers.Pixel(position.right, position.top)); | |
| bounds = new OpenLayers.Bounds(minXY.lon, minXY.lat, | |
| maxXY.lon, maxXY.lat); | |
| } else { | |
| var pixWidth = Math.abs(position.right-position.left); | |
| var pixHeight = Math.abs(position.top-position.bottom); | |
| var zoomFactor = Math.min((this.map.size.h / pixHeight), | |
| (this.map.size.w / pixWidth)); | |
| var extent = this.map.getExtent(); | |
| var center = this.map.getLonLatFromPixel( | |
| position.getCenterPixel()); | |
| var xmin = center.lon - (extent.getWidth()/2)*zoomFactor; | |
| var xmax = center.lon + (extent.getWidth()/2)*zoomFactor; | |
| var ymin = center.lat - (extent.getHeight()/2)*zoomFactor; | |
| var ymax = center.lat + (extent.getHeight()/2)*zoomFactor; | |
| bounds = new OpenLayers.Bounds(xmin, ymin, xmax, ymax); | |
| } | |
| // always zoom in/out | |
| var lastZoom = this.map.getZoom(); | |
| this.map.zoomToExtent(bounds); | |
| if (lastZoom == this.map.getZoom() && this.alwaysZoom == true){ | |
| this.map.zoomTo(lastZoom + (this.out ? -1 : 1)); | |
| } | |
| } else { // it's a pixel | |
| if (!this.out) { | |
| this.map.setCenter(this.map.getLonLatFromPixel(position), | |
| this.map.getZoom() + 1); | |
| } else { | |
| this.map.setCenter(this.map.getLonLatFromPixel(position), | |
| this.map.getZoom() - 1); | |
| } | |
| } | |
| }, | |
| CLASS_NAME: "OpenLayers.Control.ZoomBox" | |
| }); | |