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14 <div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Layer.FixedZoomLevels"></a>OpenLayers.<wbr>Layer.<wbr>FixedZoomLevels</h1><div class=CBody><p>Some Layers will already have established zoom levels (like google or ve). Instead of trying to determine them and populate a resolutions[] Array with those values, we will hijack the resolution functionality here.</p><h4 class=CHeading>When you subclass FixedZoomLevels</h4><p>The initResolutions() call gets nullified, meaning no resolutions[] array is set up. Which would be a big problem getResolution() in Layer, since it merely takes map.zoom and indexes into resolutions[]... but....</p><p>The getResolution() call is also overridden. Instead of using the resolutions[] array, we simply calculate the current resolution based on the current extent and the current map size. But how will we be able to calculate the current extent without knowing the resolution...?</p><p>The getExtent() function is also overridden. Instead of calculating extent based on the center point and the current resolution, we instead calculate the extent by getting the lonlats at the top-left and bottom-right by using the getLonLatFromViewPortPx() translation function, taken from the pixel locations (0,0) and the size of the map. But how will we be able to do lonlat-px translation without resolution....?</p><p>The getZoomForResolution() method is overridden. Instead of indexing into the resolutions[] array, we call OpenLayers.Layer.getExent(), passing in the desired resolution. With this extent, we then call getZoomForExtent()</p><p>Whenever you implement a layer using OpenLayers.Layer.FixedZoomLevels, it is your responsibility to provide the following three functions:</p><ul><li>getLonLatFromViewPortPx</li><li>getViewPortPxFromLonLat</li><li>getZoomForExtent</li></ul><p>...those three functions should generally be provided by any reasonable API that you might be working from.</p><!--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.FixedZoomLevels" >OpenLayers.<wbr>Layer.<wbr>FixedZoomLevels</a></td><td class=SDescription>Some Layers will already have established zoom levels (like google or ve). </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Layer.FixedZoomLevels.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.FixedZoomLevels.OpenLayers.Layer.FixedZoomLevels" >OpenLayers.<wbr>Layer.<wbr>FixedZoomLevels</a></td><td class=SDescription>Create a new fixed zoom levels layer.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Layer.FixedZoomLevels.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.FixedZoomLevels.initResolutions" id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">initResolutions</a></td><td class=SDescription>Populate the resolutions array</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.FixedZoomLevels.getResolution" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">getResolution</a></td><td class=SDescription>Get the current map resolution</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.FixedZoomLevels.getExtent" id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">getExtent</a></td><td class=SDescription>Calculates using px-> lonlat translation functions on tl and br corners of viewport</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.FixedZoomLevels.getZoomForResolution" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">getZoomForResolution</a></td><td class=SDescription>Get the zoom level for a given resolution</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Layer.FixedZoomLevels.getOLZoomFromMapObjectZoom" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">getOLZoomFromMapObjectZoom</a></td><td class=SDescription>Get the OL zoom index from the map object zoom level</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.FixedZoomLevels.getMapObjectZoomFromOLZoom" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">getMapObjectZoomFromOLZoom</a></td><td class=SDescription>Get the map object zoom level from the OL zoom level</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.FixedZoomLevels.Constructor"></a>Constructor</h3></div></div>
18 <div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.FixedZoomLevels.OpenLayers.Layer.FixedZoomLevels"></a>OpenLayers.<wbr>Layer.<wbr>FixedZoomLevels</h3><div class=CBody><p>Create a new fixed zoom levels layer.</p></div></div></div>
20 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.FixedZoomLevels.Functions"></a>Functions</h3></div></div>
22 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.FixedZoomLevels.initResolutions"></a>initResolutions</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>initResolutions: function()</td></tr></table></blockquote><p>Populate the resolutions array</p></div></div></div>
24 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.FixedZoomLevels.getResolution"></a>getResolution</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>getResolution: function()</td></tr></table></blockquote><p>Get the current map resolution</p><h4 class=CHeading>Returns</h4><p>{Float} Map units per Pixel</p></div></div></div>
26 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.FixedZoomLevels.getExtent"></a>getExtent</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>getExtent: function ()</td></tr></table></blockquote><p>Calculates using px-> lonlat translation functions on tl and br corners of viewport</p><h4 class=CHeading>Returns</h4><p>{<a href="../BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">OpenLayers.Bounds</a>} A Bounds object which represents the lon/lat bounds of the current viewPort.</p></div></div></div>
28 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.FixedZoomLevels.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 nowrap>getZoomForResolution: function(</td><td class=PParameter nowrap>resolution</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Get the zoom level for a given resolution</p><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></table><h4 class=CHeading>Returns</h4><p>{Integer} A suitable zoom level for the specified resolution. If no baselayer is set, returns null.</p></div></div></div>
30 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.FixedZoomLevels.getOLZoomFromMapObjectZoom"></a>getOLZoomFromMapObjectZoom</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>getOLZoomFromMapObjectZoom: function(</td><td class=PParameter nowrap>moZoom</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Get the OL zoom index from the map object zoom level</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>moZoom</td><td class=CDLDescription>{Integer}</td></tr></table><h4 class=CHeading>Returns</h4><p>{Integer} An OpenLayers Zoom level, translated from the passed in zoom Returns null if null value is passed in</p></div></div></div>
32 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Layer.FixedZoomLevels.getMapObjectZoomFromOLZoom"></a>getMapObjectZoomFromOLZoom</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>getMapObjectZoomFromOLZoom: function(</td><td class=PParameter nowrap>olZoom</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Get the map object zoom level from the OL zoom level</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>olZoom</td><td class=CDLDescription>{Integer}</td></tr></table><h4 class=CHeading>Returns</h4><p>{Integer} A MapObject level, translated from the passed in olZoom Returns null if null value is passed in</p></div></div></div>
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48 <div class=CToolTip id="tt1"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>initResolutions: function()</td></tr></table></blockquote>Populate the resolutions array</div></div><div class=CToolTip id="tt2"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>getResolution: function()</td></tr></table></blockquote>Get the current map resolution</div></div><div class=CToolTip id="tt3"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>getExtent: function ()</td></tr></table></blockquote>Calculates using px-> lonlat translation functions on tl and br corners of viewport</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>getZoomForResolution: function(</td><td class=PParameter nowrap>resolution</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Get the zoom level for a given resolution</div></div><div class=CToolTip id="tt5"><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>getOLZoomFromMapObjectZoom: function(</td><td class=PParameter nowrap>moZoom</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Get the OL zoom index from the map object zoom level</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>getMapObjectZoomFromOLZoom: function(</td><td class=PParameter nowrap>olZoom</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Get the map object zoom level from the OL zoom level</div></div><div class=CToolTip id="tt7"><div class=CClass>Instances of this class represent bounding boxes. </div></div><!--END_ND_TOOLTIPS-->
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