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<div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Tile.Image"></a>OpenLayers.<wbr>Tile.<wbr>Image</h1><div class=CBody><p>Instances of OpenLayers.Tile.Image are used to manage the image tiles used by various layers. Create a new image tile with the <a href="#OpenLayers.Tile.Image.OpenLayers.Tile.Image" class=LConstructor id=link18 onMouseOver="ShowTip(event, 'tt1', 'link18')" onMouseOut="HideTip('tt1')">OpenLayers.Tile.Image</a> constructor.</p><h4 class=CHeading>Inherits from</h4><ul><li><a href="../../deprecated-js.html#OpenLayers.Tile" class=LClass >OpenLayers.Tile</a></li></ul><!--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.Tile.Image" >OpenLayers.<wbr>Tile.<wbr>Image</a></td><td class=SDescription>Instances of OpenLayers.Tile.Image are used to manage the image tiles used by various layers. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Tile.Image.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.events" >events</a></td><td class=SDescription>{<a href="../Events-js.html#OpenLayers.Events" class=LClass >OpenLayers.Events</a>} An events object that handles all events on the tile.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.url" >url</a></td><td class=SDescription>{String} The URL of the image being requested. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.imgDiv" >imgDiv</a></td><td class=SDescription>{HTMLImageElement} The image for this tile.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.frame" >frame</a></td><td class=SDescription>{DOMElement} The image element is appended to the frame. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.imageReloadAttempts" >imageReloadAttempts</a></td><td class=SDescription>{Integer} Attempts to load the image.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.layerAlphaHack" >layerAlphaHack</a></td><td class=SDescription>{Boolean} True if the png alpha hack needs to be applied on the layer’s div.</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.asyncRequestId" >asyncRequestId</a></td><td class=SDescription>{Integer} ID of an request to see if request is still valid. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.maxGetUrlLength" >maxGetUrlLength</a></td><td class=SDescription>{Number} If set, requests that would result in GET urls with more characters than the number provided will be made using form-encoded HTTP POST. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.canvasContext" >canvasContext</a></td><td class=SDescription>{CanvasRenderingContext2D} A canvas context associated with the tile image.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.crossOriginKeyword" >crossOriginKeyword</a></td><td class=SDescription>The value of the crossorigin keyword to use when loading images. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Tile.Image.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.OpenLayers.Tile.Image" >OpenLayers.<wbr>Tile.<wbr>Image</a></td><td class=SDescription>Constructor for a new <a href="#OpenLayers.Tile.Image.OpenLayers.Tile.Image" class=LConstructor id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">OpenLayers.Tile.Image</a> instance.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Tile.Image.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.destroy" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">destroy</a></td><td class=SDescription>nullify references to prevent circular references and memory leaks</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.draw" id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">draw</a></td><td class=SDescription>Check that a tile should be drawn, and draw it.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.renderTile" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">renderTile</a></td><td class=SDescription>Internal function to actually initialize the image tile, position it correctly, and set its url.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.positionTile" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">positionTile</a></td><td class=SDescription>Using the properties currenty set on the layer, position the tile correctly. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.clear" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">clear</a></td><td class=SDescription>Remove the tile from the DOM, clear it of any image related data so that it can be reused in a new location.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.getImage" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">getImage</a></td><td class=SDescription>Returns or creates and returns the tile image.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.setImage" id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">setImage</a></td><td class=SDescription>Sets the image element for this tile. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.initImage" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">initImage</a></td><td class=SDescription>Creates the content for the frame on the tile.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.setImgSrc" id=link10 onMouseOver="ShowTip(event, 'tt10', 'link10')" onMouseOut="HideTip('tt10')">setImgSrc</a></td><td class=SDescription>Sets the source for the tile image</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.getTile" id=link11 onMouseOver="ShowTip(event, 'tt11', 'link11')" onMouseOut="HideTip('tt11')">getTile</a></td><td class=SDescription>Get the tile’s markup.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.createBackBuffer" id=link12 onMouseOver="ShowTip(event, 'tt12', 'link12')" onMouseOut="HideTip('tt12')">createBackBuffer</a></td><td class=SDescription>Create a backbuffer for this tile. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.onImageLoad" id=link13 onMouseOver="ShowTip(event, 'tt13', 'link13')" onMouseOut="HideTip('tt13')">onImageLoad</a></td><td class=SDescription>Handler for the image onload event</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.onImageError" id=link14 onMouseOver="ShowTip(event, 'tt14', 'link14')" onMouseOut="HideTip('tt14')">onImageError</a></td><td class=SDescription>Handler for the image onerror event</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.stopLoading" id=link15 onMouseOver="ShowTip(event, 'tt15', 'link15')" onMouseOut="HideTip('tt15')">stopLoading</a></td><td class=SDescription>Stops a loading sequence so <a href="#OpenLayers.Tile.Image.onImageLoad" class=LFunction id=link16 onMouseOver="ShowTip(event, 'tt13', 'link16')" onMouseOut="HideTip('tt13')">onImageLoad</a> won’t be executed.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.getCanvasContext" id=link17 onMouseOver="ShowTip(event, 'tt16', 'link17')" onMouseOut="HideTip('tt16')">getCanvasContext</a></td><td class=SDescription>Returns a canvas context associated with the tile image (with the image drawn on it). </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Tile.Image.Constants" >Constants</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.OpenLayers.Tile.Image.IMAGE" >OpenLayers.<wbr>Tile.<wbr>Image.<wbr>IMAGE</a></td><td class=SDescription>{HTMLImageElement} The image for a tile.</td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.Properties"></a>Properties</h3></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.events"></a>events</h3><div class=CBody><p>{<a href="../Events-js.html#OpenLayers.Events" class=LClass >OpenLayers.Events</a>} An events object that handles all events on the tile.</p><h4 class=CHeading>Register a listener for a particular event with the following syntax</h4><blockquote><pre class="prettyprint">tile.events.register(type, obj, listener);</pre></blockquote><h4 class=CHeading>Supported event types (in addition to the <a href="../../deprecated-js.html#OpenLayers.Tile" class=LClass >OpenLayers.Tile</a> events)</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>beforeload</td><td class=CDLDescription>Triggered before an image is prepared for loading, when the url for the image is known already. Listeners may call <a href="#OpenLayers.Tile.Image.setImage" class=LFunction id=link19 onMouseOver="ShowTip(event, 'tt8', 'link19')" onMouseOut="HideTip('tt8')">setImage</a> on the tile instance. If they do so, that image will be used and no new one will be created.</td></tr></table></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.url"></a>url</h3><div class=CBody><p>{String} The URL of the image being requested. No default. Filled in by layer.getURL() function. May be modified by loadstart listeners.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.imgDiv"></a>imgDiv</h3><div class=CBody><p>{HTMLImageElement} The image for this tile.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.frame"></a>frame</h3><div class=CBody><p>{DOMElement} The image element is appended to the frame. Any gutter on the image will be hidden behind the frame. If no gutter is set, this will be null.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.imageReloadAttempts"></a>imageReloadAttempts</h3><div class=CBody><p>{Integer} Attempts to load the image.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.layerAlphaHack"></a>layerAlphaHack</h3><div class=CBody><p>{Boolean} True if the png alpha hack needs to be applied on the layer’s div.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.asyncRequestId"></a>asyncRequestId</h3><div class=CBody><p>{Integer} ID of an request to see if request is still valid. This is a number which increments by 1 for each asynchronous request.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.maxGetUrlLength"></a>maxGetUrlLength</h3><div class=CBody><p>{Number} If set, requests that would result in GET urls with more characters than the number provided will be made using form-encoded HTTP POST. It is good practice to avoid urls that are longer than 2048 characters.</p><h4 class=CHeading>Caution</h4><p>Older versions of Gecko based browsers (e.g. Firefox < 3.5) and most Opera versions do not fully support this option. On all browsers, transition effects are not supported if POST requests are used.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.canvasContext"></a>canvasContext</h3><div class=CBody><p>{CanvasRenderingContext2D} A canvas context associated with the tile image.</p></div></div></div>
<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.crossOriginKeyword"></a>crossOriginKeyword</h3><div class=CBody><p>The value of the crossorigin keyword to use when loading images. This is only relevant when using <a href="#OpenLayers.Tile.Image.getCanvasContext" class=LFunction id=link20 onMouseOver="ShowTip(event, 'tt16', 'link20')" onMouseOut="HideTip('tt16')">getCanvasContext</a> for tiles from remote origins and should be set to either ‘anonymous’ or ‘use-credentials’ for servers that send Access-Control-Allow-Origin headers with their tiles.</p></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.Constructor"></a>Constructor</h3></div></div>
<div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.OpenLayers.Tile.Image"></a>OpenLayers.<wbr>Tile.<wbr>Image</h3><div class=CBody><p>Constructor for a new <a href="#OpenLayers.Tile.Image.OpenLayers.Tile.Image" class=LConstructor id=link21 onMouseOver="ShowTip(event, 'tt1', 'link21')" onMouseOut="HideTip('tt1')">OpenLayers.Tile.Image</a> instance.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>layer</td><td class=CDLDescription>{<a href="../Layer-js.html#OpenLayers.Layer" class=LClass >OpenLayers.Layer</a>} layer that the tile will go in.</td></tr><tr><td class=CDLEntry>position</td><td class=CDLDescription>{<a href="../BaseTypes/Pixel-js.html#OpenLayers.Pixel" class=LClass id=link22 onMouseOver="ShowTip(event, 'tt17', 'link22')" onMouseOut="HideTip('tt17')">OpenLayers.Pixel</a>}</td></tr><tr><td class=CDLEntry>bounds</td><td class=CDLDescription>{<a href="../BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link23 onMouseOver="ShowTip(event, 'tt18', 'link23')" onMouseOut="HideTip('tt18')">OpenLayers.Bounds</a>}</td></tr><tr><td class=CDLEntry>url</td><td class=CDLDescription>{<a href="../BaseTypes-js.html#OpenLayers.String" class=LClass id=link24 onMouseOver="ShowTip(event, 'tt19', 'link24')" onMouseOut="HideTip('tt19')">String</a>} Deprecated. Remove me in 3.0.</td></tr><tr><td class=CDLEntry>size</td><td class=CDLDescription>{<a href="../BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link25 onMouseOver="ShowTip(event, 'tt20', 'link25')" onMouseOut="HideTip('tt20')">OpenLayers.Size</a>}</td></tr><tr><td class=CDLEntry>options</td><td class=CDLDescription>{Object}</td></tr></table></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.Functions"></a>Functions</h3></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.destroy"></a>destroy</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">destroy: function()</td></tr></table></blockquote><p>nullify references to prevent circular references and memory leaks</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.draw"></a>draw</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">draw: function()</td></tr></table></blockquote><p>Check that a tile should be drawn, and draw it.</p><h4 class=CHeading>Returns</h4><p>{Boolean} Was a tile drawn? Or null if a beforedraw listener returned false.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.renderTile"></a>renderTile</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">renderTile: function()</td></tr></table></blockquote><p>Internal function to actually initialize the image tile, position it correctly, and set its url.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.positionTile"></a>positionTile</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">positionTile: function()</td></tr></table></blockquote><p>Using the properties currenty set on the layer, position the tile correctly. This method is used both by the async and non-async versions of the Tile.Image code.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.clear"></a>clear</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clear: function()</td></tr></table></blockquote><p>Remove the tile from the DOM, clear it of any image related data so that it can be reused in a new location.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.getImage"></a>getImage</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getImage: function()</td></tr></table></blockquote><p>Returns or creates and returns the tile image.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.setImage"></a>setImage</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>setImage: function(</td><td class="PParameter prettyprint " nowrap>img</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Sets the image element for this tile. This method should only be called from beforeload listeners.</p><p>Parameters img - {HTMLImageElement} The image to use for this tile.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.initImage"></a>initImage</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">initImage: function()</td></tr></table></blockquote><p>Creates the content for the frame on the tile.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.setImgSrc"></a>setImgSrc</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>setImgSrc: function(</td><td class="PParameter prettyprint " nowrap>url</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Sets the source for the tile image</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>url</td><td class=CDLDescription>{String} or undefined to hide the image</td></tr></table></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.getTile"></a>getTile</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getTile: function()</td></tr></table></blockquote><p>Get the tile’s markup.</p><h4 class=CHeading>Returns</h4><p>{DOMElement} The tile’s markup</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.createBackBuffer"></a>createBackBuffer</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">createBackBuffer: function()</td></tr></table></blockquote><p>Create a backbuffer for this tile. A backbuffer isn’t exactly a clone of the tile’s markup, because we want to avoid the reloading of the image. So we clone the frame, and steal the image from the tile.</p><h4 class=CHeading>Returns</h4><p>{DOMElement} The markup, or undefined if the tile has no image or if it’s currently loading.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.onImageLoad"></a>onImageLoad</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">onImageLoad: function()</td></tr></table></blockquote><p>Handler for the image onload event</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.onImageError"></a>onImageError</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">onImageError: function()</td></tr></table></blockquote><p>Handler for the image onerror event</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.stopLoading"></a>stopLoading</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">stopLoading: function()</td></tr></table></blockquote><p>Stops a loading sequence so <a href="#OpenLayers.Tile.Image.onImageLoad" class=LFunction id=link26 onMouseOver="ShowTip(event, 'tt13', 'link26')" onMouseOut="HideTip('tt13')">onImageLoad</a> won’t be executed.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.getCanvasContext"></a>getCanvasContext</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getCanvasContext: function()</td></tr></table></blockquote><p>Returns a canvas context associated with the tile image (with the image drawn on it). Returns undefined if the browser does not support canvas, if the tile has no image or if it’s currently loading.</p><p>The function returns a canvas context instance but the underlying canvas is still available in the ‘canvas’ property:</p><blockquote><pre class="prettyprint">var context = tile.getCanvasContext();
if (context) {
var data = context.canvas.toDataURL('image/jpeg');
}</pre></blockquote><h4 class=CHeading>Returns</h4><p>{Boolean}</p></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.Constants"></a>Constants</h3></div></div>
<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.OpenLayers.Tile.Image.IMAGE"></a>OpenLayers.<wbr>Tile.<wbr>Image.<wbr>IMAGE</h3><div class=CBody><p>{HTMLImageElement} The image for a tile.</p></div></div></div>
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<div id=Menu><div class=MTitle>OpenLayers<div class=MSubTitle>JavaScript Mapping Library</div></div><div class=MEntry><div class=MGroup><a href="javascript:ToggleMenu('MGroupContent35')">OpenLayers</a><div class=MGroupContent id=MGroupContent35><div class=MEntry><div class=MFile><a href="../../OpenLayers-js.html">OpenLayers</a></div></div><div class=MEntry><div class=MGroup><a href="javascript:ToggleMenu('MGroupContent1')">BaseTypes</a><div class=MGroupContent id=MGroupContent1><div class=MEntry><div class=MFile><a href="../BaseTypes-js.html">Base Types</a></div></div><div class=MEntry><div class=MFile><a href="../BaseTypes/Bounds-js.html">Bounds</a></div></div><div class=MEntry><div class=MFile><a href="../BaseTypes/Class-js.html">Class</a></div></div><div class=MEntry><div class=MFile><a href="../BaseTypes/Date-js.html">Date</a></div></div><div class=MEntry><div class=MFile><a href="../BaseTypes/Element-js.html">Element</a></div></div><div class=MEntry><div class=MFile><a 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<div class=CToolTip id="tt1"><div class=CConstructor>Constructor for a new OpenLayers.Tile.Image instance.</div></div><div class=CToolTip id="tt2"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">destroy: function()</td></tr></table></blockquote>nullify references to prevent circular references and memory leaks</div></div><div class=CToolTip id="tt3"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">draw: function()</td></tr></table></blockquote>Check that a tile should be drawn, and draw it.</div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">renderTile: function()</td></tr></table></blockquote>Internal function to actually initialize the image tile, position it correctly, and set its url.</div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">positionTile: function()</td></tr></table></blockquote>Using the properties currenty set on the layer, position the tile correctly. </div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clear: function()</td></tr></table></blockquote>Remove the tile from the DOM, clear it of any image related data so that it can be reused in a new location.</div></div><div class=CToolTip id="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getImage: function()</td></tr></table></blockquote>Returns or creates and returns the tile image.</div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table 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