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<div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Layer"></a>OpenLayers.<wbr>Layer</h1><div class=CBody><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#OpenLayers.Layer" >OpenLayers.<wbr>Layer</a></td><td class=SDescription></td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Layer.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.id" >id</a></td><td class=SDescription>{String}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.name" >name</a></td><td class=SDescription>{String}</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.div" >div</a></td><td class=SDescription>{DOMElement}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.opacity" >opacity</a></td><td class=SDescription>{Float} The layer’s opacity. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.alwaysInRange" >alwaysInRange</a></td><td class=SDescription>{Boolean} If a layer’s display should not be scale-based, this should be set to true. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Layer.Constants" >Constants</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.RESOLUTION_PROPERTIES" >RESOLUTION_PROPERTIES</a></td><td class=SDescription>{Array} The properties that are used for calculating resolutions information.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Layer.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.events" >events</a></td><td class=SDescription>{<a href="Events-js.html#OpenLayers.Events" class=LClass >OpenLayers.Events</a>}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.map" >map</a></td><td class=SDescription>{<a href="Map-js.html#OpenLayers.Map" class=LClass id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">OpenLayers.Map</a>} This variable is set when the layer is added to the map, via the accessor function setMap().</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.isBaseLayer" >isBaseLayer</a></td><td class=SDescription>{Boolean} Whether or not the layer is a base layer. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.displayInLayerSwitcher" >displayInLayerSwitcher</a></td><td class=SDescription>{Boolean} Display the layer’s name in the layer switcher. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.visibility" >visibility</a></td><td class=SDescription>{Boolean} The layer should be displayed in the map. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.attribution" >attribution</a></td><td class=SDescription>{String} Attribution string, displayed when an <a href="Control/Attribution-js.html#OpenLayers.Control.Attribution" class=LClass id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">OpenLayers.Control.Attribution</a> has been added to the map.</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.eventListeners" >eventListeners</a></td><td class=SDescription>{Object} If set as an option at construction, the eventListeners object will be registered with <a href="Events-js.html#OpenLayers.Events.on" class=LFunction id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">OpenLayers.Events.on</a>. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.gutter" >gutter</a></td><td class=SDescription>{Integer} Determines the width (in pixels) of the gutter around image tiles to ignore. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.projection" >projection</a></td><td class=SDescription>{<a href="Projection-js.html#OpenLayers.Projection" class=LClass id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">OpenLayers.Projection</a>} or {<a href="BaseTypes-js.html#OpenLayers.String" class=LClass id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">String</a>} Specifies the projection of the layer. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.units" >units</a></td><td class=SDescription>{String} The layer map units. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.scales" >scales</a></td><td class=SDescription>{Array} An array of map scales in descending order. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.resolutions" >resolutions</a></td><td class=SDescription>{Array} A list of map resolutions (map units per pixel) in descending order. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.maxExtent" >maxExtent</a></td><td class=SDescription>{<OpenLayers.Bounds>|Array} If provided as an array, the array should consist of four values (left, bottom, right, top). </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.minExtent" >minExtent</a></td><td class=SDescription>{<OpenLayers.Bounds>|Array} If provided as an array, the array should consist of four values (left, bottom, right, top). </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.maxResolution" >maxResolution</a></td><td class=SDescription>{Float} Default max is 360 deg / 256 px, which corresponds to zoom level 0 on gmaps. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.minResolution" >minResolution</a></td><td class=SDescription>{Float}</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.numZoomLevels" >numZoomLevels</a></td><td class=SDescription>{Integer}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.minScale" >minScale</a></td><td class=SDescription>{Float}</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.maxScale" >maxScale</a></td><td class=SDescription>{Float}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.displayOutsideMaxExtent" >displayOutsideMaxExtent</a></td><td class=SDescription>{Boolean} Request map tiles that are completely outside of the max extent for this layer. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.wrapDateLine" >wrapDateLine</a></td><td class=SDescription>{Boolean} Wraps the world at the international dateline, so the map can be panned infinitely in longitudinal direction. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Layer.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.OpenLayers.Layer" >OpenLayers.<wbr>Layer</a></td><td class=SDescription></td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Layer.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.setName" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">setName</a></td><td class=SDescription>Sets the new layer name for this layer. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.addOptions" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">addOptions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.onMapResize" id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">onMapResize</a></td><td class=SDescription>This function can be implemented by subclasses</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.redraw" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">redraw</a></td><td class=SDescription>Redraws the layer. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.removeMap" id=link10 onMouseOver="ShowTip(event, 'tt10', 'link10')" onMouseOut="HideTip('tt10')">removeMap</a></td><td class=SDescription>Just as setMap() allows each layer the possibility to take a personalized action on being added to the map, removeMap() allows each layer to take a personalized action on being removed from it. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.getImageSize" id=link11 onMouseOver="ShowTip(event, 'tt11', 'link11')" onMouseOut="HideTip('tt11')">getImageSize</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.setTileSize" id=link12 onMouseOver="ShowTip(event, 'tt12', 'link12')" onMouseOut="HideTip('tt12')">setTileSize</a></td><td class=SDescription>Set the tile size based on the map size. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.getVisibility" id=link13 onMouseOver="ShowTip(event, 'tt13', 'link13')" onMouseOut="HideTip('tt13')">getVisibility</a></td><td class=SDescription>{Boolean} The layer should be displayed (if in range).</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.setVisibility" id=link14 onMouseOver="ShowTip(event, 'tt14', 'link14')" onMouseOut="HideTip('tt14')">setVisibility</a></td><td class=SDescription>Set the visibility flag for the layer and hide/show & redraw accordingly. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.display" id=link15 onMouseOver="ShowTip(event, 'tt15', 'link15')" onMouseOut="HideTip('tt15')">display</a></td><td class=SDescription>Hide or show the Layer. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.calculateInRange" id=link16 onMouseOver="ShowTip(event, 'tt16', 'link16')" onMouseOut="HideTip('tt16')">calculateInRange</a></td><td class=SDescription>{Boolean} The layer is displayable at the current map’s current resolution. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.setIsBaseLayer" id=link17 onMouseOver="ShowTip(event, 'tt17', 'link17')" onMouseOut="HideTip('tt17')">setIsBaseLayer</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.getResolution" id=link18 onMouseOver="ShowTip(event, 'tt18', 'link18')" onMouseOut="HideTip('tt18')">getResolution</a></td><td class=SDescription>{Float} The currently selected resolution of the map, taken from the resolutions array, indexed by current zoom level.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.getExtent" id=link19 onMouseOver="ShowTip(event, 'tt19', 'link19')" onMouseOut="HideTip('tt19')">getExtent</a></td><td class=SDescription>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link20 onMouseOver="ShowTip(event, 'tt20', 'link20')" onMouseOut="HideTip('tt20')">OpenLayers.Bounds</a>} A Bounds object which represents the lon/lat bounds of the current viewPort.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.getZoomForExtent" id=link21 onMouseOver="ShowTip(event, 'tt21', 'link21')" onMouseOut="HideTip('tt21')">getZoomForExtent</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.getResolutionForZoom" id=link22 onMouseOver="ShowTip(event, 'tt22', 'link22')" onMouseOut="HideTip('tt22')">getResolutionForZoom</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.getZoomForResolution" id=link23 onMouseOver="ShowTip(event, 'tt23', 'link23')" onMouseOut="HideTip('tt23')">getZoomForResolution</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.getLonLatFromViewPortPx" id=link24 onMouseOver="ShowTip(event, 'tt24', 'link24')" onMouseOut="HideTip('tt24')">getLonLatFromViewPortPx</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.getViewPortPxFromLonLat" id=link25 onMouseOver="ShowTip(event, 'tt25', 'link25')" onMouseOut="HideTip('tt25')">getViewPortPxFromLonLat</a></td><td class=SDescription>Returns a pixel location given a map location. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.setOpacity" id=link26 onMouseOver="ShowTip(event, 'tt26', 'link26')" onMouseOut="HideTip('tt26')">setOpacity</a></td><td class=SDescription>Sets the opacity for the entire layer (all images)</td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Properties"></a>Properties</h3></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.id"></a>id</h3><div class=CBody><p>{String}</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.name"></a>name</h3><div class=CBody><p>{String}</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.div"></a>div</h3><div class=CBody><p>{DOMElement}</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.opacity"></a>opacity</h3><div class=CBody><p>{Float} The layer’s opacity. Float number between 0.0 and 1.0. Default is 1.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.alwaysInRange"></a>alwaysInRange</h3><div class=CBody><p>{Boolean} If a layer’s display should not be scale-based, this should be set to true. This will cause the layer, as an overlay, to always be ‘active’, by always returning true from the calculateInRange() function.</p><p>If not explicitly specified for a layer, its value will be determined on startup in initResolutions() based on whether or not any scale-specific properties have been set as options on the layer. If no scale-specific options have been set on the layer, we assume that it should always be in range.</p><p>See #987 for more info.</p></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Constants"></a>Constants</h3></div></div>
<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.RESOLUTION_PROPERTIES"></a>RESOLUTION_PROPERTIES</h3><div class=CBody><p>{Array} The properties that are used for calculating resolutions information.</p></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Properties"></a>Properties</h3></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.events"></a>events</h3><div class=CBody><p>{<a href="Events-js.html#OpenLayers.Events" class=LClass >OpenLayers.Events</a>}</p><h4 class=CHeading>Register a listener for a particular event with the following syntax</h4><blockquote><pre class="prettyprint">layer.events.register(type, obj, listener);</pre></blockquote><p>Listeners will be called with a reference to an event object. The properties of this event depends on exactly what happened.</p><h4 class=CHeading>All event objects have at least the following properties</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>object</td><td class=CDLDescription>{Object} A reference to layer.events.object.</td></tr><tr><td class=CDLEntry>element</td><td class=CDLDescription>{DOMElement} A reference to layer.events.element.</td></tr></table><h4 class=CHeading>Supported map event types</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>loadstart</td><td class=CDLDescription>Triggered when layer loading starts. When using a Vector layer with a Fixed or BBOX strategy, the event object includes a <b>filter</b> property holding the OpenLayers.Filter used when calling read on the protocol.</td></tr><tr><td class=CDLEntry>loadend</td><td class=CDLDescription>Triggered when layer loading ends. When using a Vector layer with a Fixed or BBOX strategy, the event object includes a <b>response</b> property holding an OpenLayers.Protocol.Response object.</td></tr><tr><td class=CDLEntry>visibilitychanged</td><td class=CDLDescription>Triggered when the layer’s visibility property is changed, e.g. by turning the layer on or off in the layer switcher. Note that the actual visibility of the layer can also change if it gets out of range (see <a href="#OpenLayers.Layer.calculateInRange" class=LFunction id=link27 onMouseOver="ShowTip(event, 'tt16', 'link27')" onMouseOut="HideTip('tt16')">calculateInRange</a>). If you also want to catch these cases, register for the map’s ‘changelayer’ event instead.</td></tr><tr><td class=CDLEntry>move</td><td class=CDLDescription>Triggered when layer moves (triggered with every mousemove during a drag).</td></tr><tr><td class=CDLEntry>moveend</td><td class=CDLDescription>Triggered when layer is done moving, object passed as argument has a zoomChanged boolean property which tells that the zoom has changed.</td></tr><tr><td class=CDLEntry>added</td><td class=CDLDescription>Triggered after the layer is added to a map. Listeners will receive an object with a <b>map</b> property referencing the map and a <b>layer</b> property referencing the layer.</td></tr><tr><td class=CDLEntry>removed</td><td class=CDLDescription>Triggered after the layer is removed from the map. Listeners will receive an object with a <b>map</b> property referencing the map and a <b>layer</b> property referencing the layer.</td></tr></table></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.map"></a>map</h3><div class=CBody><p>{<a href="Map-js.html#OpenLayers.Map" class=LClass id=link28 onMouseOver="ShowTip(event, 'tt1', 'link28')" onMouseOut="HideTip('tt1')">OpenLayers.Map</a>} This variable is set when the layer is added to the map, via the accessor function setMap().</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.isBaseLayer"></a>isBaseLayer</h3><div class=CBody><p>{Boolean} Whether or not the layer is a base layer. This should be set individually by all subclasses. Default is false</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.displayInLayerSwitcher"></a>displayInLayerSwitcher</h3><div class=CBody><p>{Boolean} Display the layer’s name in the layer switcher. Default is true.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.visibility"></a>visibility</h3><div class=CBody><p>{Boolean} The layer should be displayed in the map. Default is true.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.attribution"></a>attribution</h3><div class=CBody><p>{String} Attribution string, displayed when an <a href="Control/Attribution-js.html#OpenLayers.Control.Attribution" class=LClass id=link29 onMouseOver="ShowTip(event, 'tt2', 'link29')" onMouseOut="HideTip('tt2')">OpenLayers.Control.Attribution</a> has been added to the map.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.eventListeners"></a>eventListeners</h3><div class=CBody><p>{Object} If set as an option at construction, the eventListeners object will be registered with <a href="Events-js.html#OpenLayers.Events.on" class=LFunction id=link30 onMouseOver="ShowTip(event, 'tt3', 'link30')" onMouseOut="HideTip('tt3')">OpenLayers.Events.on</a>. Object structure must be a listeners object as shown in the example for the events.on method.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.gutter"></a>gutter</h3><div class=CBody><p>{Integer} Determines the width (in pixels) of the gutter around image tiles to ignore. By setting this property to a non-zero value, images will be requested that are wider and taller than the tile size by a value of 2 x gutter. This allows artifacts of rendering at tile edges to be ignored. Set a gutter value that is equal to half the size of the widest symbol that needs to be displayed. Defaults to zero. Non-tiled layers always have zero gutter.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.projection"></a>projection</h3><div class=CBody><p>{<a href="Projection-js.html#OpenLayers.Projection" class=LClass id=link31 onMouseOver="ShowTip(event, 'tt4', 'link31')" onMouseOut="HideTip('tt4')">OpenLayers.Projection</a>} or {<a href="BaseTypes-js.html#OpenLayers.String" class=LClass id=link32 onMouseOver="ShowTip(event, 'tt5', 'link32')" onMouseOut="HideTip('tt5')">String</a>} Specifies the projection of the layer. Can be set in the layer options. If not specified in the layer options, it is set to the default projection specified in the map, when the layer is added to the map. Projection along with default maxExtent and resolutions are set automatically with commercial baselayers in EPSG:3857, such as Google, Bing and OpenStreetMap, and do not need to be specified. Otherwise, if specifying projection, also set maxExtent, maxResolution or resolutions as appropriate. When using vector layers with strategies, layer projection should be set to the projection of the source data if that is different from the map default.</p><p>Can be either a string or an <a href="Projection-js.html#OpenLayers.Projection" class=LClass id=link33 onMouseOver="ShowTip(event, 'tt4', 'link33')" onMouseOut="HideTip('tt4')">OpenLayers.Projection</a> object; if a string is passed, will be converted to an object when the layer is added to the map.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.units"></a>units</h3><div class=CBody><p>{String} The layer map units. Defaults to null. Possible values are ‘degrees’ (or ‘dd’), ‘m’, ‘ft’, ‘km’, ‘mi’, ‘inches’. Normally taken from the projection. Only required if both map and layers do not define a projection, or if they define a projection which does not define units.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.scales"></a>scales</h3><div class=CBody><p>{Array} An array of map scales in descending order. The values in the array correspond to the map scale denominator. Note that these values only make sense if the display (monitor) resolution of the client is correctly guessed by whomever is configuring the application. In addition, the units property must also be set. Use <a href="#OpenLayers.Layer.resolutions" class=LProperty id=link34 onMouseOver="ShowTip(event, 'tt27', 'link34')" onMouseOut="HideTip('tt27')">resolutions</a> instead wherever possible.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.resolutions"></a>resolutions</h3><div class=CBody><p>{Array} A list of map resolutions (map units per pixel) in descending order. If this is not set in the layer constructor, it will be set based on other resolution related properties (maxExtent, maxResolution, maxScale, etc.).</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.maxExtent"></a>maxExtent</h3><div class=CBody><p>{<OpenLayers.Bounds>|Array} If provided as an array, the array should consist of four values (left, bottom, right, top). The maximum extent for the layer. Defaults to null.</p><p>The center of these bounds will not stray outside of the viewport extent during panning. In addition, if <a href="#OpenLayers.Layer.displayOutsideMaxExtent" class=LProperty id=link35 onMouseOver="ShowTip(event, 'tt28', 'link35')" onMouseOut="HideTip('tt28')">displayOutsideMaxExtent</a> is set to false, data will not be requested that falls completely outside of these bounds.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.minExtent"></a>minExtent</h3><div class=CBody><p>{<OpenLayers.Bounds>|Array} If provided as an array, the array should consist of four values (left, bottom, right, top). The minimum extent for the layer. Defaults to null.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.maxResolution"></a>maxResolution</h3><div class=CBody><p>{Float} Default max is 360 deg / 256 px, which corresponds to zoom level 0 on gmaps. Specify a different value in the layer options if you are not using the default <a href="Map-js.html#OpenLayers.Map.tileSize" class=LProperty id=link36 onMouseOver="ShowTip(event, 'tt29', 'link36')" onMouseOut="HideTip('tt29')">OpenLayers.Map.tileSize</a> and displaying the whole world.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.minResolution"></a>minResolution</h3><div class=CBody><p>{Float}</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.numZoomLevels"></a>numZoomLevels</h3><div class=CBody><p>{Integer}</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.minScale"></a>minScale</h3><div class=CBody><p>{Float}</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.maxScale"></a>maxScale</h3><div class=CBody><p>{Float}</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.displayOutsideMaxExtent"></a>displayOutsideMaxExtent</h3><div class=CBody><p>{Boolean} Request map tiles that are completely outside of the max extent for this layer. Defaults to false.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.wrapDateLine"></a>wrapDateLine</h3><div class=CBody><p>{Boolean} Wraps the world at the international dateline, so the map can be panned infinitely in longitudinal direction. Only use this on the base layer, and only if the layer’s maxExtent equals the world bounds. #487 for more info.</p></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Constructor"></a>Constructor</h3></div></div>
<div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.OpenLayers.Layer"></a>OpenLayers.<wbr>Layer</h3><div class=CBody><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>name</td><td class=CDLDescription>{String} The layer name</td></tr><tr><td class=CDLEntry>options</td><td class=CDLDescription>{Object} Hashtable of extra options to tag onto the layer</td></tr></table></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Functions"></a>Functions</h3></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.setName"></a>setName</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setName: function(</td><td class="PParameter prettyprint " nowrap>newName</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Sets the new layer name for this layer. Can trigger a changelayer event on the map.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>newName</td><td class=CDLDescription>{String} The new name.</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.addOptions"></a>addOptions</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>addOptions: function (</td><td class="PParameter prettyprint " nowrap>newOptions,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>reinitialize</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>newOptions</td><td class=CDLDescription>{Object}</td></tr><tr><td class=CDLEntry>reinitialize</td><td class=CDLDescription>{Boolean} If set to true, and if resolution options of the current baseLayer were changed, the map will be recentered to make sure that it is displayed with a valid resolution, and a changebaselayer event will be triggered.</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.onMapResize"></a>onMapResize</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">onMapResize: function()</td></tr></table></blockquote><p>This function can be implemented by subclasses</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.redraw"></a>redraw</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">redraw: function()</td></tr></table></blockquote><p>Redraws the layer. Returns true if the layer was redrawn, false if not.</p><h4 class=CHeading>Returns</h4><p>{Boolean} The layer was redrawn.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.removeMap"></a>removeMap</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>removeMap: function(</td><td class="PParameter prettyprint " nowrap>map</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Just as setMap() allows each layer the possibility to take a personalized action on being added to the map, removeMap() allows each layer to take a personalized action on being removed from it. For now, this will be mostly unused, except for the EventPane layer, which needs this hook so that it can remove the special invisible pane.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>map</td><td class=CDLDescription>{<a href="Map-js.html#OpenLayers.Map" class=LClass id=link37 onMouseOver="ShowTip(event, 'tt1', 'link37')" onMouseOut="HideTip('tt1')">OpenLayers.Map</a>}</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.getImageSize"></a>getImageSize</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getImageSize: function(</td><td class="PParameter prettyprint " nowrap>bounds</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>bounds</td><td class=CDLDescription>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link38 onMouseOver="ShowTip(event, 'tt20', 'link38')" onMouseOut="HideTip('tt20')">OpenLayers.Bounds</a>} optional tile bounds, can be used by subclasses that have to deal with different tile sizes at the layer extent edges (e.g. Zoomify)</td></tr></table><h4 class=CHeading>Returns</h4><p>{<a href="BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link39 onMouseOver="ShowTip(event, 'tt30', 'link39')" onMouseOut="HideTip('tt30')">OpenLayers.Size</a>} The size that the image should be, taking into account gutters.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.setTileSize"></a>setTileSize</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setTileSize: function(</td><td class="PParameter prettyprint " nowrap>size</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Set the tile size based on the map size. This also sets layer.imageSize or use by Tile.Image.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>size</td><td class=CDLDescription>{<a href="BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link40 onMouseOver="ShowTip(event, 'tt30', 'link40')" onMouseOut="HideTip('tt30')">OpenLayers.Size</a>}</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.getVisibility"></a>getVisibility</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getVisibility: function()</td></tr></table></blockquote><h4 class=CHeading>Returns</h4><p>{Boolean} The layer should be displayed (if in range).</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.setVisibility"></a>setVisibility</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setVisibility: function(</td><td class="PParameter prettyprint " nowrap>visibility</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Set the visibility flag for the layer and hide/show & redraw accordingly. Fire event unless otherwise specified</p><p>Note that visibility is no longer simply whether or not the layer’s style.display is set to “block”. Now we store a ‘visibility’ state property on the layer class, this allows us to remember whether or not we <b>desire</b> for a layer to be visible. In the case where the map’s resolution is out of the layer’s range, this desire may be subverted.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>visibility</td><td class=CDLDescription>{Boolean} Whether or not to display the layer (if in range)</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.display"></a>display</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>display: function(</td><td class="PParameter prettyprint " nowrap>display</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Hide or show the Layer. This is designed to be used internally, and is not generally the way to enable or disable the layer. For that, use the setVisibility function instead..</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>display</td><td class=CDLDescription>{Boolean}</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.calculateInRange"></a>calculateInRange</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">calculateInRange: function()</td></tr></table></blockquote><h4 class=CHeading>Returns</h4><p>{Boolean} The layer is displayable at the current map’s current resolution. Note that if ‘alwaysInRange’ is true for the layer, this function will always return true.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.setIsBaseLayer"></a>setIsBaseLayer</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setIsBaseLayer: function(</td><td class="PParameter prettyprint " nowrap>isBaseLayer</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>isBaseLayer</td><td class=CDLDescription>{Boolean}</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.getResolution"></a>getResolution</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getResolution: function()</td></tr></table></blockquote><h4 class=CHeading>Returns</h4><p>{Float} The currently selected resolution of the map, taken from the resolutions array, indexed by current zoom level.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.getExtent"></a>getExtent</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getExtent: function()</td></tr></table></blockquote><h4 class=CHeading>Returns</h4><p>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link41 onMouseOver="ShowTip(event, 'tt20', 'link41')" onMouseOut="HideTip('tt20')">OpenLayers.Bounds</a>} A Bounds object which represents the lon/lat bounds of the current viewPort.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.getZoomForExtent"></a>getZoomForExtent</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getZoomForExtent: function(</td><td class="PParameter prettyprint " nowrap>extent,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>closest</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>extent</td><td class=CDLDescription>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link42 onMouseOver="ShowTip(event, 'tt20', 'link42')" onMouseOut="HideTip('tt20')">OpenLayers.Bounds</a>}</td></tr><tr><td class=CDLEntry>closest</td><td class=CDLDescription>{Boolean} Find the zoom level that most closely fits the specified bounds. Note that this may result in a zoom that does not exactly contain the entire extent. Default is false.</td></tr></table><h4 class=CHeading>Returns</h4><p>{Integer} The index of the zoomLevel (entry in the resolutions array) for the passed-in extent. We do this by calculating the ideal resolution for the given extent (based on the map size) and then calling getZoomForResolution(), passing along the ‘closest’ parameter.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.getResolutionForZoom"></a>getResolutionForZoom</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getResolutionForZoom: function(</td><td class="PParameter prettyprint " nowrap>zoom</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>zoom</td><td class=CDLDescription>{Float}</td></tr></table><h4 class=CHeading>Returns</h4><p>{Float} A suitable resolution for the specified zoom.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.getZoomForResolution"></a>getZoomForResolution</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getZoomForResolution: function(</td><td class="PParameter prettyprint " nowrap>resolution,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>closest</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>resolution</td><td class=CDLDescription>{Float}</td></tr><tr><td class=CDLEntry>closest</td><td class=CDLDescription>{Boolean} Find the zoom level that corresponds to the absolute closest resolution, which may result in a zoom whose corresponding resolution is actually smaller than we would have desired (if this is being called from a getZoomForExtent() call, then this means that the returned zoom index might not actually contain the entire extent specified... but it’ll be close). Default is false.</td></tr></table><h4 class=CHeading>Returns</h4><p>{Integer} The index of the zoomLevel (entry in the resolutions array) that corresponds to the best fit resolution given the passed in value and the ‘closest’ specification.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.getLonLatFromViewPortPx"></a>getLonLatFromViewPortPx</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getLonLatFromViewPortPx: function (</td><td class="PParameter prettyprint " nowrap>viewPortPx</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>viewPortPx</td><td class=CDLDescription>{<OpenLayers.Pixel>|Object} An OpenLayers.Pixel or an object with a ‘x’ and ‘y’ properties.</td></tr></table><h4 class=CHeading>Returns</h4><p>{<a href="BaseTypes/LonLat-js.html#OpenLayers.LonLat" class=LClass id=link43 onMouseOver="ShowTip(event, 'tt31', 'link43')" onMouseOut="HideTip('tt31')">OpenLayers.LonLat</a>} An OpenLayers.LonLat which is the passed-in view port <a href="BaseTypes/Pixel-js.html#OpenLayers.Pixel" class=LClass id=link44 onMouseOver="ShowTip(event, 'tt32', 'link44')" onMouseOut="HideTip('tt32')">OpenLayers.Pixel</a>, translated into lon/lat by the layer.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.getViewPortPxFromLonLat"></a>getViewPortPxFromLonLat</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getViewPortPxFromLonLat: function (</td><td class="PParameter prettyprint " nowrap>lonlat,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>resolution</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Returns a pixel location given a map location. This method will return fractional pixel values.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>lonlat</td><td class=CDLDescription>{<OpenLayers.LonLat>|Object} An OpenLayers.LonLat or an object with a ‘lon’ and ‘lat’ properties.</td></tr></table><h4 class=CHeading>Returns</h4><p>{<a href="BaseTypes/Pixel-js.html#OpenLayers.Pixel" class=LClass id=link45 onMouseOver="ShowTip(event, 'tt32', 'link45')" onMouseOut="HideTip('tt32')">OpenLayers.Pixel</a>} An <a href="BaseTypes/Pixel-js.html#OpenLayers.Pixel" class=LClass id=link46 onMouseOver="ShowTip(event, 'tt32', 'link46')" onMouseOut="HideTip('tt32')">OpenLayers.Pixel</a> which is the passed-in lonlat translated into view port pixels.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.setOpacity"></a>setOpacity</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setOpacity: function(</td><td class="PParameter prettyprint " nowrap>opacity</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Sets the opacity for the entire layer (all images)</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>opacity</td><td class=CDLDescription>{Float}</td></tr></table></div></div></div>
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<!--START_ND_TOOLTIPS-->
<div class=CToolTip id="tt1"><div class=CClass>Instances of OpenLayers.Map are interactive maps embedded in a web page. </div></div><div class=CToolTip id="tt2"><div class=CClass>The attribution control adds attribution from layers to the map display. </div></div><div class=CToolTip id="tt3"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>on: function(</td><td class="PParameter prettyprint " nowrap>object</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Convenience method for registering listeners with a common scope. </div></div><div class=CToolTip id="tt4"><div class=CClass>Methods for coordinate transforms between coordinate systems. </div></div><div class=CToolTip id="tt5"><div class=CClass>Contains convenience functions for string manipulation.</div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setName: function(</td><td class="PParameter prettyprint " nowrap>newName</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the new layer name for this layer. </div></div><div class=CToolTip id="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>addOptions: function (</td><td class="PParameter prettyprint " nowrap>newOptions,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>reinitialize</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">onMapResize: function()</td></tr></table></blockquote>This function can be implemented by subclasses</div></div><div class=CToolTip id="tt9"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">redraw: function()</td></tr></table></blockquote>Redraws the layer. </div></div><div class=CToolTip id="tt10"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>removeMap: function(</td><td class="PParameter prettyprint " nowrap>map</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Just as setMap() allows each layer the possibility to take a personalized action on being added to the map, removeMap() allows each layer to take a personalized action on being removed from it. </div></div><div class=CToolTip id="tt11"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getImageSize: function(</td><td class="PParameter prettyprint " nowrap>bounds</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt12"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setTileSize: function(</td><td class="PParameter prettyprint " nowrap>size</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Set the tile size based on the map size. </div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getVisibility: function()</td></tr></table></blockquote>{Boolean} The layer should be displayed (if in range).</div></div><div class=CToolTip id="tt14"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setVisibility: function(</td><td class="PParameter prettyprint " nowrap>visibility</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Set the visibility flag for the layer and hide/show & redraw accordingly. </div></div><div class=CToolTip id="tt15"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>display: function(</td><td class="PParameter prettyprint " nowrap>display</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Hide or show the Layer. </div></div><div class=CToolTip id="tt16"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">calculateInRange: function()</td></tr></table></blockquote>{Boolean} The layer is displayable at the current map’s current resolution. </div></div><div class=CToolTip id="tt17"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setIsBaseLayer: function(</td><td class="PParameter prettyprint " nowrap>isBaseLayer</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt18"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getResolution: function()</td></tr></table></blockquote>{Float} The currently selected resolution of the map, taken from the resolutions array, indexed by current zoom level.</div></div><div class=CToolTip id="tt19"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getExtent: function()</td></tr></table></blockquote>{OpenLayers.Bounds} A Bounds object which represents the lon/lat bounds of the current viewPort.</div></div><div class=CToolTip id="tt20"><div class=CClass>Instances of this class represent bounding boxes. </div></div><div class=CToolTip id="tt21"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getZoomForExtent: function(</td><td class="PParameter prettyprint " nowrap>extent,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>closest</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt22"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getResolutionForZoom: function(</td><td class="PParameter prettyprint " nowrap>zoom</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt23"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getZoomForResolution: function(</td><td class="PParameter prettyprint " nowrap>resolution,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>closest</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt24"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getLonLatFromViewPortPx: function (</td><td class="PParameter prettyprint " nowrap>viewPortPx</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt25"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>getViewPortPxFromLonLat: function (</td><td class="PParameter prettyprint " nowrap>lonlat,</td></tr><tr><td></td><td class="PParameter prettyprint " nowrap>resolution</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Returns a pixel location given a map location. </div></div><div class=CToolTip id="tt26"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>setOpacity: function(</td><td class="PParameter prettyprint " nowrap>opacity</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the opacity for the entire layer (all images)</div></div><div class=CToolTip id="tt27"><div class=CProperty>{Array} A list of map resolutions (map units per pixel) in descending order. </div></div><div class=CToolTip id="tt28"><div class=CProperty>{Boolean} Request map tiles that are completely outside of the max extent for this layer. </div></div><div class=CToolTip id="tt29"><div class=CProperty>{OpenLayers.Size} Set in the map options to override the default tile size for this map.</div></div><div class=CToolTip id="tt30"><div class=CClass>Instances of this class represent a width/height pair</div></div><div class=CToolTip id="tt31"><div class=CClass>This class represents a longitude and latitude pair</div></div><div class=CToolTip id="tt32"><div class=CClass>This class represents a screen coordinate, in x and y coordinates</div></div><!--END_ND_TOOLTIPS-->
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