| 1 | | /** |
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| 2 | | * @fileoverview Locator Map Control |
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| 3 | | * @author Tim Schaub |
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| 4 | | */ |
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| 5 | | |
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| 6 | | // @require: OpenLayers/Control.js |
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| 7 | | |
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| 8 | | /** |
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| 9 | | * @class |
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| 10 | | */ |
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| 11 | | OpenLayers.Control.OverviewMap = OpenLayers.Class.create(); |
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| 12 | | |
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| 13 | | OpenLayers.Control.OverviewMap.prototype = |
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| 14 | | OpenLayers.Util.extend( new OpenLayers.Control(), { |
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| 15 | | |
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| 16 | | /** For div.id |
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| 17 | | * @type String */ |
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| 18 | | id: "OverviewMap", |
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| 19 | | |
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| 20 | | /** @type DOMElement */ |
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| 21 | | element: null, |
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| 22 | | |
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| 23 | | /** |
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| 24 | | * The overvew map itself. |
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| 25 | | * @type OpenLayers.Map |
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| 26 | | */ |
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| 27 | | ovmap: null, |
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| 28 | | |
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| 29 | | /** |
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| 30 | | * Ordered list of layers in the overview map. If none are sent at |
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| 31 | | * construction, then the default below is used. |
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| 32 | | * |
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| 33 | | * @type Array(OpenLayers.Layer) |
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| 34 | | */ |
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| 35 | | layers: [], |
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| 36 | | |
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| 37 | | /** |
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| 38 | | * The ratio of the overview map resolution to the main map resolution |
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| 39 | | * at which to zoom farther out on the overview map. |
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| 40 | | * @type Float |
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| 41 | | */ |
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| 42 | | minRatio: 8, |
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| 43 | | |
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| 44 | | /** |
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| 45 | | * The ratio of the overview map resolution to the main map resolution |
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| 46 | | * at which to zoom farther in on the overview map. |
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| 47 | | * @type Float |
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| 48 | | */ |
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| 49 | | maxRatio: 32, |
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| 50 | | |
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| 51 | | /** |
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| 52 | | * @constructor |
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| 53 | | * @param {Object} options Hashtable of options to set on the overview map |
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| 54 | | */ |
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| 55 | | initialize: function(options) { |
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| 56 | | OpenLayers.Control.prototype.initialize.apply(this, [options]); |
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| 57 | | }, |
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| 58 | | |
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| 59 | | /** |
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| 60 | | * @type DOMElement |
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| 61 | | */ |
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| 62 | | draw: function() { |
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| 63 | | OpenLayers.Control.prototype.draw.apply(this, arguments); |
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| 64 | | |
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| 65 | | if(!(this.layers.length > 0)) { |
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| 66 | | if (this.map.baseLayer) { |
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| 67 | | var layer = this.map.baseLayer.clone(); |
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| 68 | | this.layers = [layer]; |
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| 69 | | } else { |
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| 70 | | this.map.events.register("changebaselayer", this, this.baseLayerDraw); |
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| 71 | | return this.div; |
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| 72 | | } |
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| 73 | | } |
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| 74 | | |
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| 75 | | // create overview map DOM elements |
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| 76 | | this.element = document.createElement('div'); |
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| 77 | | this.element.className = 'olControlOverviewMapElement'; |
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| 78 | | this.element.style.display = 'none'; |
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| 79 | | |
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| 80 | | this.mapDiv = document.createElement('div'); |
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| 81 | | this.mapDiv.style.width = '180px'; |
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| 82 | | this.mapDiv.style.height = '90px'; |
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| 83 | | this.mapDiv.style.position = 'relative'; |
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| 84 | | this.mapDiv.style.overflow = 'hidden'; |
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| 85 | | this.mapDiv.id = OpenLayers.Util.createUniqueID('overviewMap'); |
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| 86 | | |
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| 87 | | this.extentRectangle = document.createElement('div'); |
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| 88 | | this.extentRectangle.style.position = 'absolute'; |
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| 89 | | this.extentRectangle.style.zIndex = 1000; //HACK |
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| 90 | | this.extentRectangle.style.backgroundImage = 'url(' + |
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| 91 | | OpenLayers.Util.getImagesLocation() + |
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| 92 | | '/blank.png)'; |
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| 93 | | this.extentRectangle.className = 'olControlOverviewMapExtentRectangle'; |
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| 94 | | this.mapDiv.appendChild(this.extentRectangle); |
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| 95 | | |
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| 96 | | this.element.appendChild(this.mapDiv); |
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| 97 | | |
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| 98 | | this.div.appendChild(this.element); |
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| 99 | | this.div.className = 'olControlOverviewMapContainer'; |
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| 100 | | |
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| 101 | | this.map.events.register('moveend', this, this.update); |
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| 102 | | |
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| 103 | | // Set up events. The image div recenters the map on click. |
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| 104 | | // The extent rectangle can be dragged to recenter the map. |
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| 105 | | // If the mousedown happened elsewhere, then mousemove and mouseup |
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| 106 | | // should slip through. |
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| 107 | | this.elementEvents = new OpenLayers.Events(this, this.element); |
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| 108 | | this.elementEvents.register('mousedown', this, function(e) { |
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| 109 | | OpenLayers.Event.stop(e); |
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| 110 | | }); |
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| 111 | | this.elementEvents.register('click', this, function(e) { |
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| 112 | | OpenLayers.Event.stop(e); |
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| 113 | | }); |
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| 114 | | this.elementEvents.register('dblclick', this, function(e) { |
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| 115 | | OpenLayers.Event.stop(e); |
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| 116 | | }); |
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| 117 | | this.rectEvents = new OpenLayers.Events(this, this.extentRectangle); |
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| 118 | | this.rectEvents.register('mouseover', this, this.rectMouseOver); |
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| 119 | | this.rectEvents.register('mouseout', this, this.rectMouseOut); |
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| 120 | | this.rectEvents.register('mousedown', this, this.rectMouseDown); |
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| 121 | | this.rectEvents.register('mousemove', this, this.rectMouseMove); |
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| 122 | | this.rectEvents.register('mouseup', this, this.rectMouseUp); |
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| 123 | | this.rectEvents.register('click', this, function(e) { |
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| 124 | | OpenLayers.Event.stop(e); |
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| 125 | | }); |
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| 126 | | this.rectEvents.register('dblclick', this, this.rectDblClick ); |
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| 127 | | this.mapDivEvents = new OpenLayers.Events(this, this.mapDiv); |
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| 128 | | this.mapDivEvents.register('click', this, this.mapDivClick); |
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| 129 | | |
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| 130 | | // There should be an option to place the control outside of the |
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| 131 | | // map viewport. This would make these buttons optional. |
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| 132 | | var imgLocation = OpenLayers.Util.getImagesLocation(); |
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| 133 | | // maximize button div |
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| 134 | | var img = imgLocation + 'layer-switcher-maximize.png'; |
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| 135 | | this.maximizeDiv = OpenLayers.Util.createAlphaImageDiv( |
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| 136 | | 'olControlOverviewMapMaximizeButton', |
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| 137 | | null, |
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| 138 | | new OpenLayers.Size(18,18), |
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| 139 | | img, |
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| 140 | | 'absolute'); |
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| 141 | | this.maximizeDiv.style.display = 'none'; |
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| 142 | | this.maximizeDiv.className = 'olControlOverviewMapMaximizeButton'; |
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| 143 | | OpenLayers.Event.observe(this.maximizeDiv, |
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| 144 | | 'click', |
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| 145 | | this.maximizeControl.bindAsEventListener(this)); |
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| 146 | | this.div.appendChild(this.maximizeDiv); |
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| 147 | | |
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| 148 | | // minimize button div |
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| 149 | | var img = imgLocation + 'layer-switcher-minimize.png'; |
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| 150 | | this.minimizeDiv = OpenLayers.Util.createAlphaImageDiv( |
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| 151 | | 'OpenLayers_Control_minimizeDiv', |
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| 152 | | null, |
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| 153 | | new OpenLayers.Size(18,18), |
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| 154 | | img, |
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| 155 | | 'absolute'); |
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| 156 | | this.minimizeDiv.style.display = 'none'; |
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| 157 | | this.minimizeDiv.className = 'olControlOverviewMapMinimizeButton'; |
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| 158 | | OpenLayers.Event.observe(this.minimizeDiv, |
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| 159 | | 'click', |
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| 160 | | this.minimizeControl.bindAsEventListener(this)); |
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| 161 | | |
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| 162 | | this.div.appendChild(this.minimizeDiv); |
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| 163 | | |
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| 164 | | this.minimizeControl(); |
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| 165 | | |
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| 166 | | return this.div; |
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| 167 | | }, |
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| 168 | | |
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| 169 | | baseLayerDraw: function() { |
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| 170 | | this.draw(); |
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| 171 | | this.map.events.unregister("changebaselayer", this, this.baseLayerDraw); |
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| 172 | | }, |
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| 173 | | |
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| 174 | | /** |
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| 175 | | * @param {OpenLayers.Event} evt |
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| 176 | | */ |
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| 177 | | rectMouseOver: function (evt) { |
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| 178 | | this.extentRectangle.style.cursor = 'move'; |
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| 179 | | }, |
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| 180 | | |
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| 181 | | /** |
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| 182 | | * @param {OpenLayers.Event} evt |
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| 183 | | */ |
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| 184 | | rectMouseOut: function (evt) { |
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| 185 | | this.extentRectangle.style.cursor = 'default'; |
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| 186 | | if(this.rectDragStart != null) { |
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| 187 | | if(this.performedRectDrag) { |
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| 188 | | this.updateMapToRect(); |
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| 189 | | } |
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| 190 | | document.onselectstart = null; |
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| 191 | | this.rectDragStart = null; |
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| 192 | | } |
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| 193 | | }, |
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| 194 | | |
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| 195 | | /** |
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| 196 | | * @param {OpenLayers.Event} evt |
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| 197 | | */ |
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| 198 | | rectMouseDown: function (evt) { |
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| 199 | | if(!OpenLayers.Event.isLeftClick(evt)) return; |
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| 200 | | this.rectDragStart = evt.xy.clone(); |
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| 201 | | this.performedRectDrag = false; |
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| 202 | | OpenLayers.Event.stop(evt); |
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| 203 | | }, |
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| 204 | | |
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| 205 | | /** |
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| 206 | | * @param {OpenLayers.Event} evt |
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| 207 | | */ |
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| 208 | | rectMouseMove: function(evt) { |
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| 209 | | if(this.rectDragStart != null) { |
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| 210 | | var deltaX = this.rectDragStart.x - evt.xy.x; |
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| 211 | | var deltaY = this.rectDragStart.y - evt.xy.y; |
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| 212 | | var rectPxBounds = this.getRectPxBounds(); |
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| 213 | | var rectTop = rectPxBounds.top; |
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| 214 | | var rectLeft = rectPxBounds.left; |
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| 215 | | var rectHeight = Math.abs(rectPxBounds.getHeight()); |
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| 216 | | var rectWidth = rectPxBounds.getWidth(); |
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| 217 | | // don't allow dragging off of parent element |
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| 218 | | var newTop = Math.max(0, (rectTop - deltaY)); |
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| 219 | | newTop = Math.min(newTop, |
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| 220 | | this.ovmap.size.h - this.hComp - rectHeight); |
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| 221 | | var newLeft = Math.max(0, (rectLeft - deltaX)); |
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| 222 | | newLeft = Math.min(newLeft, |
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| 223 | | this.ovmap.size.w - this.wComp - rectWidth); |
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| 224 | | this.setRectPxBounds(new OpenLayers.Bounds(newLeft, |
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| 225 | | newTop + rectHeight, |
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| 226 | | newLeft + rectWidth, |
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| 227 | | newTop)); |
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| 228 | | this.rectDragStart = evt.xy.clone(); |
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| 229 | | this.performedRectDrag = true; |
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| 230 | | OpenLayers.Event.stop(evt); |
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| 231 | | } |
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| 232 | | }, |
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| 233 | | |
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| 234 | | /** |
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| 235 | | * @param {OpenLayers.Event} evt |
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| 236 | | */ |
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| 237 | | rectMouseUp: function(evt) { |
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| 238 | | if(!OpenLayers.Event.isLeftClick(evt)) return; |
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| 239 | | if(this.performedRectDrag) { |
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| 240 | | this.updateMapToRect(); |
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| 241 | | OpenLayers.Event.stop(evt); |
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| 242 | | } |
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| 243 | | document.onselectstart = null; |
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| 244 | | this.rectDragStart = null; |
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| 245 | | }, |
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| 246 | | |
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| 247 | | /** |
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| 248 | | * @param {OpenLayers.Event} evt |
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| 249 | | */ |
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| 250 | | rectDblClick: function(evt) { |
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| 251 | | this.performedRectDrag = false; |
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| 252 | | OpenLayers.Event.stop(evt); |
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| 253 | | this.updateOverview(); |
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| 254 | | }, |
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| 255 | | |
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| 256 | | /** |
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| 257 | | * @param {OpenLayers.Event} evt |
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| 258 | | */ |
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| 259 | | mapDivClick: function(evt) { |
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| 260 | | var pxBounds = this.getRectPxBounds(); |
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| 261 | | var pxCenter = pxBounds.getCenterPixel(); |
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| 262 | | var deltaX = evt.xy.x - pxCenter.x; |
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| 263 | | var deltaY = evt.xy.y - pxCenter.y; |
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| 264 | | var top = pxBounds.top; |
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| 265 | | var left = pxBounds.left; |
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| 266 | | var height = Math.abs(pxBounds.getHeight()); |
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| 267 | | var width = pxBounds.getWidth(); |
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| 268 | | var newTop = Math.max(0, (top + deltaY)); |
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| 269 | | newTop = Math.min(newTop, this.ovmap.size.h - height); |
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| 270 | | var newLeft = Math.max(0, (left + deltaX)); |
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| 271 | | newLeft = Math.min(newLeft, this.ovmap.size.w - width); |
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| 272 | | this.setRectPxBounds(new OpenLayers.Bounds(newLeft, |
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| 273 | | newTop + height, |
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| 274 | | newLeft + width, |
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| 275 | | newTop)); |
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| 276 | | this.updateMapToRect(); |
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| 277 | | OpenLayers.Event.stop(evt); |
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| 278 | | }, |
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| 279 | | |
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| 280 | | /** Set up the labels and divs for the control |
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| 281 | | * |
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| 282 | | * @param {OpenLayers.Event} e |
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| 283 | | */ |
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| 284 | | maximizeControl: function(e) { |
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| 285 | | this.element.style.display = ''; |
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| 286 | | this.showToggle(false); |
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| 287 | | if (e != null) { |
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| 288 | | OpenLayers.Event.stop(e); |
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| 289 | | } |
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| 290 | | }, |
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| 291 | | |
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| 292 | | /** Hide all the contents of the control, shrink the size, |
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| 293 | | * add the maximize icon |
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| 294 | | * |
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| 295 | | * @param {OpenLayers.Event} e |
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| 296 | | */ |
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| 297 | | minimizeControl: function(e) { |
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| 298 | | this.element.style.display = 'none'; |
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| 299 | | this.showToggle(true); |
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| 300 | | if (e != null) { |
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| 301 | | OpenLayers.Event.stop(e); |
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| 302 | | } |
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| 303 | | }, |
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| 304 | | |
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| 305 | | /** Hide/Show all LayerSwitcher controls depending on whether we are |
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| 306 | | * minimized or not |
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| 307 | | * |
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| 308 | | * @private |
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| 309 | | * |
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| 310 | | * @param {Boolean} minimize |
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| 311 | | */ |
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| 312 | | showToggle: function(minimize) { |
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| 313 | | this.maximizeDiv.style.display = minimize ? '' : 'none'; |
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| 314 | | this.minimizeDiv.style.display = minimize ? 'none' : ''; |
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| 315 | | }, |
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| 316 | | |
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| 317 | | /** |
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| 318 | | * Update the overview map after layers move. |
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| 319 | | */ |
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| 320 | | update: function() { |
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| 321 | | if(this.ovmap == null) { |
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| 322 | | this.createMap(); |
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| 323 | | } |
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| 324 | | |
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| 325 | | if(!this.isSuitableOverview()) { |
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| 326 | | this.updateOverview(); |
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| 327 | | } |
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| 328 | | |
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| 329 | | // update extent rectangle |
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| 330 | | this.updateRectToMap(); |
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| 331 | | }, |
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| 332 | | |
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| 333 | | /** |
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| 334 | | * Determines if the overview map is suitable given the extent and |
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| 335 | | * resolution of the main map. |
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| 336 | | */ |
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| 337 | | isSuitableOverview: function() { |
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| 338 | | var mapExtent = this.map.getExtent(); |
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| 339 | | var maxExtent = this.map.maxExtent; |
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| 340 | | var testExtent = new OpenLayers.Bounds( |
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| 341 | | Math.max(mapExtent.left, maxExtent.left), |
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| 342 | | Math.max(mapExtent.bottom, maxExtent.bottom), |
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| 343 | | Math.min(mapExtent.right, maxExtent.right), |
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| 344 | | Math.min(mapExtent.top, maxExtent.top)); |
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| 345 | | var resRatio = this.ovmap.getResolution() / this.map.getResolution(); |
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| 346 | | return ((resRatio > this.minRatio) && |
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| 347 | | (resRatio <= this.maxRatio) && |
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| 348 | | (this.ovmap.getExtent().containsBounds(testExtent))); |
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| 349 | | }, |
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| 350 | | |
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| 351 | | updateOverview: function() { |
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| 352 | | var mapRes = this.map.getResolution(); |
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| 353 | | var targetRes = this.ovmap.getResolution(); |
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| 354 | | var resRatio = targetRes / mapRes; |
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| 355 | | if(resRatio > this.maxRatio) { |
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| 356 | | // zoom in overview map |
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| 357 | | targetRes = this.minRatio * mapRes; |
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| 358 | | } else if(resRatio <= this.minRatio) { |
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| 359 | | // zoom out overview map |
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| 360 | | targetRes = this.maxRatio * mapRes; |
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| 361 | | } |
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| 362 | | this.ovmap.setCenter(this.map.center, |
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| 363 | | this.ovmap.getZoomForResolution(targetRes)); |
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| 364 | | this.updateRectToMap(); |
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| 365 | | }, |
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| 366 | | |
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| 367 | | createMap: function() { |
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| 368 | | // create the overview map |
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| 369 | | this.ovmap = new OpenLayers.Map(this.mapDiv.id, {controls: [], maxResolution: 'auto'}); |
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| 370 | | this.ovmap.addLayers(this.layers); |
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| 371 | | this.ovmap.zoomToMaxExtent(); |
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| 372 | | // check extent rectangle border width |
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| 373 | | this.wComp = parseInt(OpenLayers.Element.getStyle(this.extentRectangle, |
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| 374 | | 'border-left-width')) + |
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| 375 | | parseInt(OpenLayers.Element.getStyle(this.extentRectangle, |
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| 376 | | 'border-right-width')); |
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| 377 | | this.wComp = (this.wComp) ? this.wComp : 2; |
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| 378 | | this.hComp = parseInt(OpenLayers.Element.getStyle(this.extentRectangle, |
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| 379 | | 'border-top-width')) + |
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| 380 | | parseInt(OpenLayers.Element.getStyle(this.extentRectangle, |
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| 381 | | 'border-bottom-width')); |
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| 382 | | this.hComp = (this.hComp) ? this.hComp : 2; |
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| 383 | | }, |
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| 384 | | |
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| 385 | | /** |
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| 386 | | * Updates the extent rectangle position and size to match the map extent |
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| 387 | | */ |
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| 388 | | updateRectToMap: function() { |
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| 389 | | if(this.map.units != 'degrees') { |
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| 390 | | if(this.map.projection != this.ovmap.map.projection) { |
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| 391 | | alert('The overview map only works when it is in the same projection as the main map'); |
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| 392 | | } |
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| 393 | | } |
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| 394 | | var pxBounds = this.getRectBoundsFromMapBounds(this.map.getExtent()); |
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| 395 | | this.setRectPxBounds(pxBounds); |
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| 396 | | }, |
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| 397 | | |
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| 398 | | /** |
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| 399 | | * Updates the map extent to match the extent rectangle position and size |
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| 400 | | */ |
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| 401 | | updateMapToRect: function() { |
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| 402 | | var pxBounds = this.getRectPxBounds(); |
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| 403 | | var lonLatBounds = this.getMapBoundsFromRectBounds(pxBounds); |
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| 404 | | this.map.setCenter(lonLatBounds.getCenterLonLat(), this.map.zoom); |
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| 405 | | }, |
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| 406 | | |
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| 407 | | /** |
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| 408 | | * Get extent rectangle pixel bounds |
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| 409 | | * @returns An OpenLayers.Bounds wich is the extent rectangle's pixel |
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| 410 | | * bounds (relative to the parent element) |
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| 411 | | */ |
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| 412 | | getRectPxBounds: function() { |
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| 413 | | var top = parseInt(this.extentRectangle.style.top); |
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| 414 | | var left = parseInt(this.extentRectangle.style.left); |
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| 415 | | var height = parseInt(this.extentRectangle.style.height); |
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| 416 | | var width = parseInt(this.extentRectangle.style.width); |
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| 417 | | return new OpenLayers.Bounds(left, top + height, left + width, top); |
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| 418 | | }, |
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| 419 | | |
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| 420 | | /** |
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| 421 | | * Set extent rectangle pixel bounds. |
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| 422 | | * @param {OpenLayers.Bounds} pxBounds |
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| 423 | | */ |
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| 424 | | setRectPxBounds: function(pxBounds) { |
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| 425 | | var top = Math.max(pxBounds.top, 0); |
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| 426 | | var left = Math.max(pxBounds.left, 0); |
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| 427 | | var bottom = Math.min(pxBounds.top + Math.abs(pxBounds.getHeight()), |
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| 428 | | this.ovmap.size.h - this.hComp); |
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| 429 | | var right = Math.min(pxBounds.left + pxBounds.getWidth(), |
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| 430 | | this.ovmap.size.w - this.wComp); |
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| 431 | | this.extentRectangle.style.top = parseInt(top) + 'px'; |
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| 432 | | this.extentRectangle.style.left = parseInt(left) + 'px'; |
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| 433 | | this.extentRectangle.style.height = parseInt(bottom - top)+ 'px'; |
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| 434 | | this.extentRectangle.style.width = parseInt(right - left) + 'px'; |
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| 435 | | }, |
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| 436 | | |
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| 437 | | /** |
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| 438 | | * @param {OpenLayers.Bounds} lonLatBounds |
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| 439 | | * |
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| 440 | | * @returns An OpenLayers.Bounds which is the passed-in map lon/lat extent |
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| 441 | | * translated into pixel bounds for the overview map |
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| 442 | | * @type OpenLayers.Bounds |
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| 443 | | */ |
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| 444 | | getRectBoundsFromMapBounds: function(lonLatBounds) { |
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| 445 | | var leftBottomLonLat = new OpenLayers.LonLat(lonLatBounds.left, |
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| 446 | | lonLatBounds.bottom); |
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| 447 | | var rightTopLonLat = new OpenLayers.LonLat(lonLatBounds.right, |
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| 448 | | lonLatBounds.top); |
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| 449 | | var leftBottomPx = this.getOverviewPxFromLonLat(leftBottomLonLat); |
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| 450 | | var rightTopPx = this.getOverviewPxFromLonLat(rightTopLonLat); |
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| 451 | | return new OpenLayers.Bounds(leftBottomPx.x, leftBottomPx.y, |
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| 452 | | rightTopPx.x, rightTopPx.y); |
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| 453 | | }, |
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| 454 | | |
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| 455 | | /** |
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| 456 | | * @param {OpenLayers.Bounds} pxBounds |
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| 457 | | * |
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| 458 | | * @returns An OpenLayers.Bounds which is the passed-in overview rect bounds |
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| 459 | | * translated into lon/lat bounds for the overview map |
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| 460 | | * @type OpenLayers.Bounds |
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| 461 | | */ |
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| 462 | | getMapBoundsFromRectBounds: function(pxBounds) { |
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| 463 | | var leftBottomPx = new OpenLayers.Pixel(pxBounds.left, |
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| 464 | | pxBounds.bottom); |
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| 465 | | var rightTopPx = new OpenLayers.Pixel(pxBounds.right, |
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| 466 | | pxBounds.top); |
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| 467 | | var leftBottomLonLat = this.getLonLatFromOverviewPx(leftBottomPx); |
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| 468 | | var rightTopLonLat = this.getLonLatFromOverviewPx(rightTopPx); |
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| 469 | | return new OpenLayers.Bounds(leftBottomLonLat.lon, leftBottomLonLat.lat, |
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| 470 | | rightTopLonLat.lon, rightTopLonLat.lat); |
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| 471 | | }, |
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| 472 | | |
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| 473 | | /** |
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| 474 | | * @param {OpenLayers.Pixel} overviewMapPx |
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| 475 | | * |
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| 476 | | * @returns An OpenLayers.LonLat which is the passed-in overview map |
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| 477 | | * OpenLayers.Pixel, translated into lon/lat by the overview map |
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| 478 | | * @type OpenLayers.LonLat |
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| 479 | | */ |
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| 480 | | getLonLatFromOverviewPx: function(overviewMapPx) { |
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| 481 | | var size = this.ovmap.size; |
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| 482 | | var res = this.ovmap.getResolution(); |
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| 483 | | var center = this.ovmap.getExtent().getCenterLonLat(); |
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| 484 | | |
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| 485 | | var delta_x = overviewMapPx.x - (size.w / 2); |
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| 486 | | var delta_y = overviewMapPx.y - (size.h / 2); |
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| 487 | | |
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| 488 | | return new OpenLayers.LonLat(center.lon + delta_x * res , |
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| 489 | | center.lat - delta_y * res); |
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| 490 | | }, |
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| 491 | | |
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| 492 | | /** |
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| 493 | | * @param {OpenLayers.LonLat} lonlat |
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| 494 | | * |
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| 495 | | * @returns An OpenLayers.Pixel which is the passed-in OpenLayers.LonLat, |
|---|
| 496 | | * translated into overview map pixels |
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| 497 | | * @type OpenLayers.Pixel |
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| 498 | | */ |
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| 499 | | getOverviewPxFromLonLat: function(lonlat) { |
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| 500 | | var res = this.ovmap.getResolution(); |
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| 501 | | var extent = this.ovmap.getExtent(); |
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| 502 | | return new OpenLayers.Pixel( |
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| 503 | | Math.round(1/res * (lonlat.lon - extent.left)), |
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| 504 | | Math.round(1/res * (extent.top - lonlat.lat)) |
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| 505 | | ); |
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| 506 | | }, |
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| 507 | | |
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| 508 | | /** @final @type String */ |
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| 509 | | CLASS_NAME: 'OpenLayers.Control.OverviewMap' |
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| 510 | | |
|---|
| 511 | | }); |