--- a/labs/openlayers/lib/OpenLayers/Control/ZoomBox.js +++ b/labs/openlayers/lib/OpenLayers/Control/ZoomBox.js @@ -1,1 +1,96 @@ +/* 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.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 - {} or {} + */ + 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" +}); +