openlayers/doc/devdocs/files/OpenLayers/Tile/Image-js.html

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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.&nbsp;  Create a new image tile with the <a href="#OpenLayers.Tile.Image" class=LClass id=link14 onMouseOver="ShowTip(event, 'tt14', 'link14')" onMouseOut="HideTip('tt14')">OpenLayers.Tile.Image</a> constructor.</p><h4 class=CHeading>Inherits from</h4><ul><li><a href="../Tile-js.html#OpenLayers.Tile" class=LClass id=link15 onMouseOver="ShowTip(event, 'tt1', 'link15')" onMouseOut="HideTip('tt1')">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.url" >url</a></td><td class=SDescription>{String} The URL of the image being requested. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.imgDiv" >imgDiv</a></td><td class=SDescription>{DOMElement} The div element which wraps the image.</td></tr><tr class="SProperty SIndent2 SMarked"><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"><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&rsquo;s div.</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.isBackBuffer" >isBackBuffer</a></td><td class=SDescription>{Boolean} Is this tile a back buffer tile?</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.lastRatio" >lastRatio</a></td><td class=SDescription>{Float} Used in transition code only. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.isFirstDraw" >isFirstDraw</a></td><td class=SDescription>{Boolean} Is this the first time the tile is being drawn?&nbsp; </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.backBufferTile" >backBufferTile</a></td><td class=SDescription>{<a href="../Tile-js.html#OpenLayers.Tile" class=LClass id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">OpenLayers.Tile</a>} A clone of the tile used to create transition effects when the tile is moved or changes resolution.</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.clone" id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">clone</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.draw" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">draw</a></td><td class=SDescription>Check that a tile should be drawn, and draw it.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.resetBackBuffer" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">resetBackBuffer</a></td><td class=SDescription>Triggered by two different events, layer loadend, and tile loadend. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.renderTile" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">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.positionImage" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">positionImage</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=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">clear</a></td><td class=SDescription>Clear the tile of any bounds/position-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.initImgDiv" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">initImgDiv</a></td><td class=SDescription>Creates the imgDiv property on the tile.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.checkImgURL" id=link10 onMouseOver="ShowTip(event, 'tt10', 'link10')" onMouseOut="HideTip('tt10')">checkImgURL</a></td><td class=SDescription>Make sure that the image that just loaded is the one this tile is meant to display, since panning/zooming might have changed the tile&rsquo;s URL in the meantime. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.startTransition" id=link11 onMouseOver="ShowTip(event, 'tt11', 'link11')" onMouseOut="HideTip('tt11')">startTransition</a></td><td class=SDescription>This method is invoked on tiles that are backBuffers for tiles in the grid. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.show" id=link12 onMouseOver="ShowTip(event, 'tt12', 'link12')" onMouseOut="HideTip('tt12')">show</a></td><td class=SDescription>Show the tile by showing its frame.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.hide" id=link13 onMouseOver="ShowTip(event, 'tt13', 'link13')" onMouseOut="HideTip('tt13')">hide</a></td><td class=SDescription>Hide the tile by hiding its frame.</td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
  15
  16 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.Properties"></a>Properties</h3></div></div>
  17
  18 <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.&nbsp; No default.&nbsp; Filled in by layer.getURL() function.</p></div></div></div>
  19
  20 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.imgDiv"></a>imgDiv</h3><div class=CBody><p>{DOMElement} The div element which wraps the image.</p></div></div></div>
  21
  22 <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.&nbsp;  Any gutter on the image will be hidden behind the frame.</p></div></div></div>
  23
  24 <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&rsquo;s div.</p></div></div></div>
  25
  26 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.isBackBuffer"></a>isBackBuffer</h3><div class=CBody><p>{Boolean} Is this tile a back buffer tile?</p></div></div></div>
  27
  28 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.lastRatio"></a>lastRatio</h3><div class=CBody><p>{Float} Used in transition code only.&nbsp;  This is the previous ratio of the back buffer tile resolution to the map resolution.&nbsp;  Compared with the current ratio to determine if zooming occurred.</p></div></div></div>
  29
  30 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.isFirstDraw"></a>isFirstDraw</h3><div class=CBody><p>{Boolean} Is this the first time the tile is being drawn?&nbsp; This is used to force resetBackBuffer to synchronize the backBufferTile with the foreground tile the first time the foreground tile loads so that if the user zooms before the layer has fully loaded, the backBufferTile for tiles that have been loaded can be used.</p></div></div></div>
  31
  32 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.backBufferTile"></a>backBufferTile</h3><div class=CBody><p>{<a href="../Tile-js.html#OpenLayers.Tile" class=LClass id=link16 onMouseOver="ShowTip(event, 'tt1', 'link16')" onMouseOut="HideTip('tt1')">OpenLayers.Tile</a>} A clone of the tile used to create transition effects when the tile is moved or changes resolution.</p></div></div></div>
  33
  34 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.Functions"></a>Functions</h3></div></div>
  35
  36 <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>destroy: function()</td></tr></table></blockquote><p>nullify references to prevent circular references and memory leaks</p></div></div></div>
  37
  38 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.clone"></a>clone</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 nowrap>clone: function (</td><td class=PParameter nowrap>obj</td><td class=PAfterParameters 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>obj</td><td class=CDLDescription>{<a href="#OpenLayers.Tile.Image" class=LClass id=link17 onMouseOver="ShowTip(event, 'tt14', 'link17')" onMouseOut="HideTip('tt14')">OpenLayers.Tile.Image</a>} The tile to be cloned</td></tr></table><h4 class=CHeading>Returns</h4><p>{<a href="#OpenLayers.Tile.Image" class=LClass id=link18 onMouseOver="ShowTip(event, 'tt14', 'link18')" onMouseOut="HideTip('tt14')">OpenLayers.Tile.Image</a>} An exact clone of this <a href="#OpenLayers.Tile.Image" class=LClass id=link19 onMouseOver="ShowTip(event, 'tt14', 'link19')" onMouseOut="HideTip('tt14')">OpenLayers.Tile.Image</a></p></div></div></div>
  39
  40 <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>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} Always returns true.</p></div></div></div>
  41
  42 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.resetBackBuffer"></a>resetBackBuffer</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>resetBackBuffer: function()</td></tr></table></blockquote><p>Triggered by two different events, layer loadend, and tile loadend.&nbsp; In any of these cases, we check to see if we can hide the backBufferTile yet and update its parameters to match the foreground tile.</p><h4 class=CHeading>Basic logic</h4><ul><li>If the backBufferTile hasn&rsquo;t been drawn yet, reset it</li><li>If layer is still loading, show foreground tile but don&rsquo;t hide the backBufferTile yet</li><li>If layer is done loading, reset backBuffer tile and show foreground tile</li></ul></div></div></div>
  43
  44 <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>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>
  45
  46 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.positionImage"></a>positionImage</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>positionImage: function()</td></tr></table></blockquote><p>Using the properties currenty set on the layer, position the tile correctly.&nbsp; This method is used both by the async and non-async versions of the Tile.Image code.</p></div></div></div>
  47
  48 <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>clear: function()</td></tr></table></blockquote><p>Clear the tile of any bounds/position-related data so that it can be reused in a new location.</p></div></div></div>
  49
  50 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.initImgDiv"></a>initImgDiv</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>initImgDiv: function()</td></tr></table></blockquote><p>Creates the imgDiv property on the tile.</p></div></div></div>
  51
  52 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.checkImgURL"></a>checkImgURL</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>checkImgURL: function ()</td></tr></table></blockquote><p>Make sure that the image that just loaded is the one this tile is meant to display, since panning/zooming might have changed the tile&rsquo;s URL in the meantime.&nbsp; If the tile URL did change before the image loaded, set the imgDiv display to &lsquo;none&rsquo;, as either (a) it will be reset to visible when the new URL loads in the image, or (b) we don&rsquo;t want to display this tile after all because its new bounds are outside our maxExtent.</p><p>This function should no longer  be neccesary with the improvements to Grid.js in OpenLayers 2.3.&nbsp; The lack of a good isEquivilantURL function caused problems in 2.2, but it&rsquo;s possible that with the improved isEquivilant URL function, this might be neccesary at some point.</p><p>See discussion in the thread at <a href="http://openlayers.org/pipermail/dev/2007-January/000205.html" class=LURL target=_top>http://openlayers.org<wbr>/pipermail<wbr>/dev<wbr>/2007-January<wbr>/000205.html</a></p></div></div></div>
  53
  54 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.startTransition"></a>startTransition</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>startTransition: function()</td></tr></table></blockquote><p>This method is invoked on tiles that are backBuffers for tiles in the grid.&nbsp;  The grid tile is about to be cleared and a new tile source loaded.&nbsp;  This is where the transition effect needs to be started to provide visual continuity.</p></div></div></div>
  55
  56 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.show"></a>show</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>show: function()</td></tr></table></blockquote><p>Show the tile by showing its frame.</p></div></div></div>
  57
  58 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.hide"></a>hide</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>hide: function()</td></tr></table></blockquote><p>Hide the tile by hiding its frame.</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('MGroupContent29')">OpenLayers</a><div class=MGroupContent id=MGroupContent29><div class=MEntry><div class=MFile><a href="../../OpenLayers-js.html">OpenLayers</a></div></div><div class=MEntry><div class=MFile><a href="../Ajax-js.html">Ajax</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/Element-js.html">Element</a></div></div><div class=MEntry><div class=MFile><a href="../BaseTypes/LonLat-js.html">LonLat</a></div></div><div class=MEntry><div class=MFile><a href="../BaseTypes/Pixel-js.html">Pixel</a></div></div><div class=MEntry><div class=MFile><a href="../BaseTypes/Size-js.html">Size</a></div></div></div></div></div><div class=MEntry><div class=MFile><a href="../Console-js.html">Console</a></div></div><div class=MEntry><div class=MGroup><a href="javascript:ToggleMenu('MGroupContent3')">Control</a><div class=MGroupContent id=MGroupContent3><div class=MEntry><div class=MFile><a href="../Control-js.html">Control</a></div></div><div class=MEntry><div class=MGroup><a href="javascript:ToggleMenu('MGroupContent2')">Control</a><div class=MGroupContent id=MGroupContent2><div class=MEntry><div class=MFile><a href="../Control/ArgParser-js.html">ArgParser</a></div></div><div class=MEntry><div class=MFile><a href="../Control/Attribution-js.html">Attribution</a></div></div><div class=MEntry><div class=MFile><a href="../Control/Button-js.html">Button</a></div></div><div class=MEntry><div class=MFile><a href="../Control/DragFeature-js.html">DragFeature</a></div></div><div class=MEntry><div class=MFile><a href="../Control/DragPan-js.html">DragPan</a></div></div><div class=MEntry><div class=MFile><a href="../Control/DrawFeature-js.html">DrawFeature</a></div></div><div class=MEntry><div class=MFile><a href="../Control/EditingToolbar-js.html">EditingToolbar</a></div></div><div class=MEntry><div class=MFile><a href="../Control/GetFeature-js.html">GetFeature</a></div></div><div class=MEntry><div class=MFile><a href="../Control/KeyboardDefaults-js.html">KeyboardDefaults</a></div></div><div class=MEntry><div class=MFile><a href="../Control/LayerSwitcher-js.html">LayerSwitcher</a></div></div><div class=MEntry><div class=MFile><a href="../Control/Measure-js.html">Measure</a></div></div><div class=MEntry><div class=MFile><a href="../Control/ModifyFeature-js.html">ModifyFeature</a></div></div><div class=MEntry><div class=MFile><a href="../Control/MouseDefaults-js.html">MouseDefaults</a></div></div><div class=MEntry><div class=MFile><a href="../Control/MousePosition-js.html">MousePosition</a></div></div><div class=MEntry><div class=MFile><a href="../Control/MouseToolbar-js.html">MouseToolbar</a></div></div><div class=MEntry><div class=MFile><a href="../Control/Navigation-js.html">Navigation</a></div></div><div class=MEntry><div class=MFile><a href="../Control/NavigationHistory-js.html">NavigationHistory</a></div></div><div class=MEntry><div class=MFile><a href="../Control/NavToolbar-js.html">NavToolbar</a></div></div><div class=MEntry><div class=MFile><a href="../Control/OverviewMap-js.html">OverviewMap</a></div></div><div class=MEntry><div class=MFile><a href="../Control/Pan-js.html">Pan</a></div></div><div class=MEntry><div class=MFile><a href="../Control/Panel-js.html">Panel</a></div></div><div class=MEntry><div class=MFile><a href="../Control/PanPanel-js.html">PanPanel</a></div></div><div class=MEntry><div class=MFile><a href="../Control/PanZoom-js.html">PanZoom</a></div></div><div class=MEntry><div class=MFile><a href="../Control/PanZoomBar-js.html">PanZoomBar</a></div></div><div class=MEntry><div class=MFile><a href="../Control/Permalink-js.html">Permalink</a></div></div><div class=MEntry><div class=MFile><a href="../Control/Scale-js.html">Scale</a></div></div><div class=MEntry><div class=MFile><a href="../Control/ScaleLine-js.html">ScaleLine</a></div></div><div class=MEntry><div class=MFile><a href="../Control/SelectFeature-js.html">SelectFeature</a></div></div><div class=MEntry><div class=MFile><a href="../Control/Snapping-js.html">Snapping</a></div></div><div class=MEntry><div class=MFile><a href="../Control/Split-js.html">Split</a></div></div><div class=MEntry><div class=MFile><a href="../Control/WMSGetFeatureInfo-js.html">WMSGetFeatureInfo</a></div></div><div class=MEntry><div class=MFile><a href="../Control/ZoomBox-js.html">ZoomBox</a></div></div><div class=MEntry><div class=MFile><a href="../Control/ZoomIn-js.html">ZoomI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  70
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  73 <!--START_ND_TOOLTIPS-->
  74 <div class=CToolTip id="tt1"><div class=CClass>This is a class designed to designate a single tile, however it is explicitly designed to do relatively little. </div></div><div class=CToolTip id="tt2"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>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><table border=0 cellspacing=0 cellpadding=0><tr><td class=PBeforeParameters nowrap>clone: function (</td><td class=PParameter nowrap>obj</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>draw: function()</td></tr></table></blockquote>Check that a tile should be drawn, and draw it.</div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>resetBackBuffer: function()</td></tr></table></blockquote>Triggered by two different events, layer loadend, and tile loadend. </div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>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="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>positionImage: function()</td></tr></table></blockquote>Using the properties currenty set on the layer, position the tile correctly. </div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>clear: function()</td></tr></table></blockquote>Clear the tile of any bounds/position-related data so that it can be reused in a new location.</div></div><div class=CToolTip id="tt9"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>initImgDiv: function()</td></tr></table></blockquote>Creates the imgDiv property on the tile.</div></div><div class=CToolTip id="tt10"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>checkImgURL: function ()</td></tr></table></blockquote>Make sure that the image that just loaded is the one this tile is meant to display, since panning/zooming might have changed the tile&rsquo;s URL in the meantime. </div></div><div class=CToolTip id="tt11"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>startTransition: function()</td></tr></table></blockquote>This method is invoked on tiles that are backBuffers for tiles in the grid. </div></div><div class=CToolTip id="tt12"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>show: function()</td></tr></table></blockquote>Show the tile by showing its frame.</div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>hide: function()</td></tr></table></blockquote>Hide the tile by hiding its frame.</div></div><div class=CToolTip id="tt14"><div class=CClass>Instances of OpenLayers.Tile.Image are used to manage the image tiles used by various layers. </div></div><!--END_ND_TOOLTIPS-->
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