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14 <div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Layer.Grid"></a>OpenLayers.<wbr>Layer.Grid</h1><div class=CBody><p>Base class for layers that use a lattice of tiles. Create a new grid layer with the <a href="#OpenLayers.Layer.Grid.OpenLayers.Layer.Grid" class=LConstructor id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">OpenLayers.Layer.Grid</a> constructor.</p><h4 class=CHeading>Inherits from</h4><ul><li><a href="HTTPRequest-js.html#OpenLayers.Layer.HTTPRequest" class=LClass >OpenLayers.Layer.HTTPRequest</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.Layer.Grid" >OpenLayers.<wbr>Layer.Grid</a></td><td class=SDescription>Base class for layers that use a lattice of tiles. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Layer.Grid.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.Grid.tileSize" >tileSize</a></td><td class=SDescription>{<a href="../BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">OpenLayers.Size</a>}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.Grid.singleTile" >singleTile</a></td><td class=SDescription>{Boolean} Moves the layer into single-tile mode, meaning that one tile will be loaded. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.Grid.ratio" >ratio</a></td><td class=SDescription>{Float} Used only when in single-tile mode, this specifies the ratio of the size of the single tile to the size of the map.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.Grid.buffer" >buffer</a></td><td class=SDescription>{Integer} Used only when in gridded mode, this specifies the number of extra rows and colums of tiles on each side which will surround the minimum grid tiles to cover the map.</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.Grid.numLoadingTiles" >numLoadingTiles</a></td><td class=SDescription>{Integer} How many tiles are still loading?</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Layer.Grid.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.Grid.OpenLayers.Layer.Grid" >OpenLayers.<wbr>Layer.Grid</a></td><td class=SDescription>Create a new grid layer</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Layer.Grid.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.Grid.destroy" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">destroy</a></td><td class=SDescription>Deconstruct the layer and clear the grid.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.Grid.clone" id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">clone</a></td><td class=SDescription>Create a clone of this layer</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.Grid.setTileSize" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">setTileSize</a></td><td class=SDescription>Check if we are in singleTile mode and if so, set the size as a ratio of the map size (as specified by the layer’s ‘ratio’ property).</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.Grid.getTilesBounds" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">getTilesBounds</a></td><td class=SDescription>Return the bounds of the tile grid.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.Grid.addTile" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">addTile</a></td><td class=SDescription>Gives subclasses of Grid the opportunity to create an OpenLayer.Tile of their choosing. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.Grid.getTileBounds" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">getTileBounds</a></td><td class=SDescription>Returns The tile bounds for a layer given a pixel location.</td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
16 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.Properties"></a>Properties</h3></div></div>
18 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.tileSize"></a>tileSize</h3><div class=CBody><p>{<a href="../BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link9 onMouseOver="ShowTip(event, 'tt1', 'link9')" onMouseOut="HideTip('tt1')">OpenLayers.Size</a>}</p></div></div></div>
20 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.singleTile"></a>singleTile</h3><div class=CBody><p>{Boolean} Moves the layer into single-tile mode, meaning that one tile will be loaded. The tile’s size will be determined by the ‘ratio’ property. When the tile is dragged such that it does not cover the entire viewport, it is reloaded.</p></div></div></div>
22 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.ratio"></a>ratio</h3><div class=CBody><p>{Float} Used only when in single-tile mode, this specifies the ratio of the size of the single tile to the size of the map.</p></div></div></div>
24 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.buffer"></a>buffer</h3><div class=CBody><p>{Integer} Used only when in gridded mode, this specifies the number of extra rows and colums of tiles on each side which will surround the minimum grid tiles to cover the map.</p></div></div></div>
26 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.numLoadingTiles"></a>numLoadingTiles</h3><div class=CBody><p>{Integer} How many tiles are still loading?</p></div></div></div>
28 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.Constructor"></a>Constructor</h3></div></div>
30 <div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.OpenLayers.Layer.Grid"></a>OpenLayers.<wbr>Layer.Grid</h3><div class=CBody><p>Create a new grid layer</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>name</td><td class=CDLDescription>{String}</td></tr><tr><td class=CDLEntry>url</td><td class=CDLDescription>{String}</td></tr><tr><td class=CDLEntry>params</td><td class=CDLDescription>{Object}</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>
32 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.Functions"></a>Functions</h3></div></div>
34 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.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>Deconstruct the layer and clear the grid.</p></div></div></div>
36 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.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><p>Create a clone of this layer</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>obj</td><td class=CDLDescription>{Object} Is this ever used?</td></tr></table><h4 class=CHeading>Returns</h4><p>{<a href="#OpenLayers.Layer.Grid.OpenLayers.Layer.Grid" class=LConstructor id=link10 onMouseOver="ShowTip(event, 'tt8', 'link10')" onMouseOut="HideTip('tt8')">OpenLayers.Layer.Grid</a>} An exact clone of this OpenLayers.Layer.Grid</p></div></div></div>
38 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.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 nowrap>setTileSize: function(</td><td class=PParameter nowrap>size</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Check if we are in singleTile mode and if so, set the size as a ratio of the map size (as specified by the layer’s ‘ratio’ property).</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=link11 onMouseOver="ShowTip(event, 'tt1', 'link11')" onMouseOut="HideTip('tt1')">OpenLayers.Size</a>}</td></tr></table></div></div></div>
40 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.getTilesBounds"></a>getTilesBounds</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>getTilesBounds: function()</td></tr></table></blockquote><p>Return the bounds of the tile grid.</p><h4 class=CHeading>Returns</h4><p>{<a href="../BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link12 onMouseOver="ShowTip(event, 'tt9', 'link12')" onMouseOut="HideTip('tt9')">OpenLayers.Bounds</a>} A Bounds object representing the bounds of all the currently loaded tiles (including those partially or not at all seen onscreen).</p></div></div></div>
42 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.addTile"></a>addTile</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>addTile:function(</td><td class=PParameter nowrap>bounds,</td></tr><tr><td></td><td class=PParameter nowrap>position</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Gives subclasses of Grid the opportunity to create an OpenLayer.Tile of their choosing. The implementer should initialize the new tile and take whatever steps necessary to display it.</p><p>Parameters bounds - {<a href="../BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link13 onMouseOver="ShowTip(event, 'tt9', 'link13')" onMouseOut="HideTip('tt9')">OpenLayers.Bounds</a>} position - {<a href="../BaseTypes/Pixel-js.html#OpenLayers.Pixel" class=LClass id=link14 onMouseOver="ShowTip(event, 'tt10', 'link14')" onMouseOut="HideTip('tt10')">OpenLayers.Pixel</a>}</p><h4 class=CHeading>Returns</h4><p>{<a href="../Tile-js.html#OpenLayers.Tile" class=LClass id=link15 onMouseOver="ShowTip(event, 'tt11', 'link15')" onMouseOut="HideTip('tt11')">OpenLayers.Tile</a>} The added OpenLayers.Tile</p></div></div></div>
44 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.Grid.getTileBounds"></a>getTileBounds</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>getTileBounds: function(</td><td class=PParameter nowrap>viewPortPx</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Returns The tile bounds for a layer given a pixel location.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>viewPortPx</td><td class=CDLDescription>{<a href="../BaseTypes/Pixel-js.html#OpenLayers.Pixel" class=LClass id=link16 onMouseOver="ShowTip(event, 'tt10', 'link16')" onMouseOut="HideTip('tt10')">OpenLayers.Pixel</a>} The location in the viewport.</td></tr></table><h4 class=CHeading>Returns</h4><p>{<a href="../BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link17 onMouseOver="ShowTip(event, 'tt9', 'link17')" onMouseOut="HideTip('tt9')">OpenLayers.Bounds</a>} Bounds of the tile at the given pixel location.</p></div></div></div>
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59 <!--START_ND_TOOLTIPS-->
60 <div class=CToolTip id="tt1"><div class=CClass>Instances of this class represent a width/height pair</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>Deconstruct the layer and clear the grid.</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>Create a clone of this layer</div></div><div class=CToolTip id="tt4"><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>setTileSize: function(</td><td class=PParameter nowrap>size</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Check if we are in singleTile mode and if so, set the size as a ratio of the map size (as specified by the layer’s ‘ratio’ property).</div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>getTilesBounds: function()</td></tr></table></blockquote>Return the bounds of the tile grid.</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 nowrap>addTile:function(</td><td class=PParameter nowrap>bounds,</td></tr><tr><td></td><td class=PParameter nowrap>position</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Gives subclasses of Grid the opportunity to create an OpenLayer.Tile of their choosing. </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 nowrap>getTileBounds: function(</td><td class=PParameter nowrap>viewPortPx</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Returns The tile bounds for a layer given a pixel location.</div></div><div class=CToolTip id="tt8"><div class=CConstructor>Create a new grid layer</div></div><div class=CToolTip id="tt9"><div class=CClass>Instances of this class represent bounding boxes. </div></div><div class=CToolTip id="tt10"><div class=CClass>This class represents a screen coordinate, in x and y coordinates</div></div><div class=CToolTip id="tt11"><div class=CClass>This is a class designed to designate a single tile, however it is explicitly designed to do relatively little. </div></div><!--END_ND_TOOLTIPS-->
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