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3 <html><head><title>OpenLayers.Layer.FixedZoomLevels - OpenLayers</title><link rel="stylesheet" type="text/css" href="../../../styles/main.css"><script language=JavaScript src="../../../javascript/main.js"></script><script language=JavaScript src="../../../javascript/searchdata.js"></script></head><body class="ContentPage" onLoad="NDOnLoad()"><script language=JavaScript><!--
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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.getResolution" id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">getResolution</a></td><td class=SDescription>Get the current map resolution</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Layer.FixedZoomLevels.getExtent" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">getExtent</a></td><td class=SDescription>Calculates using px-> lonlat translation functions on tl and br corners of viewport</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.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>
24 <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=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">OpenLayers.Bounds</a>} A Bounds object which represents the lon/lat bounds of the current viewPort.</p></div></div></div>
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