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Viewing changes to gis/dhis-gis-geostat/mfbase/openlayers/lib/OpenLayers/Control/ZoomBox.js

  • Committer: larshelge at gmail
  • Date: 2009-03-03 16:46:36 UTC
  • Revision ID: larshelge@gmail.com-20090303164636-2sjlrquo7ib1gf7r
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gis/dhis-gis-geostat/mfbase/openlayers/lib/OpenLayers/Control/ZoomBox.js
 
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/* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
 
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 * license.  See http://svn.openlayers.org/trunk/openlayers/license.txt for the
 
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 * full text of the license. */
 
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/**
 
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 * @requires OpenLayers/Control.js
 
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 * @requires OpenLayers/Handler/Box.js
 
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 */
 
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/**
 
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 * Class: OpenLayers.Control.ZoomBox
 
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 *
 
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 * Inherits from:
 
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 *  - <OpenLayers.Control>
 
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 */
 
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OpenLayers.Control.ZoomBox = OpenLayers.Class(OpenLayers.Control, {
 
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    /**
 
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     * Property: type
 
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     * {OpenLayers.Control.TYPE}
 
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     */
 
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    type: OpenLayers.Control.TYPE_TOOL,
 
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    /**
 
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     * Property: out
 
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     * {Boolean} Should the control be used for zooming out?
 
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     */
 
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    out: false,
 
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    /**
 
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     * Method: draw
 
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     */    
 
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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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    /**
 
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     * Method: zoomBox
 
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     *
 
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     * Parameters:
 
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     * position - {<OpenLayers.Bounds>} or {<OpenLayers.Pixel>}
 
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     */
 
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    zoomBox: function (position) {
 
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        if (position instanceof OpenLayers.Bounds) {
 
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            if (!this.out) {
 
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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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            } else {
 
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                var pixWidth = Math.abs(position.right-position.left);
 
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                var pixHeight = Math.abs(position.top-position.bottom);
 
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                var zoomFactor = Math.min((this.map.size.h / pixHeight),
 
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                    (this.map.size.w / pixWidth));
 
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                var extent = this.map.getExtent();
 
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                var center = this.map.getLonLatFromPixel(
 
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                    position.getCenterPixel());
 
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                var xmin = center.lon - (extent.getWidth()/2)*zoomFactor;
 
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                var xmax = center.lon + (extent.getWidth()/2)*zoomFactor;
 
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                var ymin = center.lat - (extent.getHeight()/2)*zoomFactor;
 
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                var ymax = center.lat + (extent.getHeight()/2)*zoomFactor;
 
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                var bounds = new OpenLayers.Bounds(xmin, ymin, xmax, ymax);
 
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            }
 
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            this.map.zoomToExtent(bounds);
 
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        } else { // it's a pixel
 
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            if (!this.out) {
 
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                this.map.setCenter(this.map.getLonLatFromPixel(position),
 
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                               this.map.getZoom() + 1);
 
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            } else {
 
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                this.map.setCenter(this.map.getLonLatFromPixel(position),
 
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                               this.map.getZoom() - 1);
 
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            }
 
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        }
 
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    },
 
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    CLASS_NAME: "OpenLayers.Control.ZoomBox"
 
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});