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14 <div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Renderer"></a>OpenLayers.<wbr>Renderer</h1><div class=CBody><p>This is the base class for all renderers.</p><p>This is based on a merger code written by Paul Spencer and Bertil Chapuis. It is largely composed of virtual functions that are to be implemented in technology-specific subclasses, but there is some generic code too.</p><p>The functions that <b>are</b> implemented here merely deal with the maintenance of the size and extent variables, as well as the cached ‘resolution’ value.</p><p>A note to the user that all subclasses should use getResolution() instead of directly accessing this.resolution in order to correctly use the cacheing system.</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.Renderer" >OpenLayers.<wbr>Renderer</a></td><td class=SDescription>This is the base class for all renderers.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.container" >container</a></td><td class=SDescription>{DOMElement}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.root" >root</a></td><td class=SDescription>{DOMElement}</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.extent" >extent</a></td><td class=SDescription>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">OpenLayers.Bounds</a>}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.locked" >locked</a></td><td class=SDescription>{Boolean} If the renderer is currently in a state where many things are changing, the ‘locked’ property is set to true. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.size" >size</a></td><td class=SDescription>{<a href="BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">OpenLayers.Size</a>}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.resolution" >resolution</a></td><td class=SDescription>{Float} cache of current map resolution</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.map" >map</a></td><td class=SDescription>{<a href="Map-js.html#OpenLayers.Map" class=LClass id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">OpenLayers.Map</a>} Reference to the map -- this is set in Vector’s setMap()</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.OpenLayers.Renderer" >OpenLayers.<wbr>Renderer</a></td><td class=SDescription></td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.destroy" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">destroy</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.supported" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">supported</a></td><td class=SDescription>This should be overridden by specific subclasses</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.setExtent" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">setExtent</a></td><td class=SDescription>Set the visible part of the layer.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.setSize" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">setSize</a></td><td class=SDescription>Sets the size of the drawing surface.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.getResolution" id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">getResolution</a></td><td class=SDescription>Uses cached copy of resolution if available to minimize computing</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.drawFeature" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">drawFeature</a></td><td class=SDescription>Draw the feature. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.drawGeometry" id=link10 onMouseOver="ShowTip(event, 'tt10', 'link10')" onMouseOut="HideTip('tt10')">drawGeometry</a></td><td class=SDescription>Draw a geometry. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.drawText" id=link11 onMouseOver="ShowTip(event, 'tt11', 'link11')" onMouseOut="HideTip('tt11')">drawText</a></td><td class=SDescription>Function for drawing text labels. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.removeText" id=link12 onMouseOver="ShowTip(event, 'tt12', 'link12')" onMouseOut="HideTip('tt12')">removeText</a></td><td class=SDescription>Function for removing text labels. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.clear" id=link13 onMouseOver="ShowTip(event, 'tt13', 'link13')" onMouseOut="HideTip('tt13')">clear</a></td><td class=SDescription>Clear all vectors from the renderer. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.getFeatureIdFromEvent" id=link14 onMouseOver="ShowTip(event, 'tt14', 'link14')" onMouseOut="HideTip('tt14')">getFeatureIdFromEvent</a></td><td class=SDescription>Returns a feature id from an event on the renderer. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.eraseFeatures" id=link15 onMouseOver="ShowTip(event, 'tt15', 'link15')" onMouseOut="HideTip('tt15')">eraseFeatures</a></td><td class=SDescription>This is called by the layer to erase features</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.eraseGeometry" id=link16 onMouseOver="ShowTip(event, 'tt16', 'link16')" onMouseOut="HideTip('tt16')">eraseGeometry</a></td><td class=SDescription>Remove a geometry from the renderer (by id). </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.moveRoot" id=link17 onMouseOver="ShowTip(event, 'tt17', 'link17')" onMouseOut="HideTip('tt17')">moveRoot</a></td><td class=SDescription>moves this renderer’s root to a (different) renderer. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.getRenderLayerId" id=link18 onMouseOver="ShowTip(event, 'tt18', 'link18')" onMouseOut="HideTip('tt18')">getRenderLayerId</a></td><td class=SDescription>Gets the layer that this renderer’s output appears on. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
16 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Properties"></a>Properties</h3></div></div>
18 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.container"></a>container</h3><div class=CBody><p>{DOMElement}</p></div></div></div>
20 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.root"></a>root</h3><div class=CBody><p>{DOMElement}</p></div></div></div>
22 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.extent"></a>extent</h3><div class=CBody><p>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link19 onMouseOver="ShowTip(event, 'tt1', 'link19')" onMouseOut="HideTip('tt1')">OpenLayers.Bounds</a>}</p></div></div></div>
24 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.locked"></a>locked</h3><div class=CBody><p>{Boolean} If the renderer is currently in a state where many things are changing, the ‘locked’ property is set to true. This means that renderers can expect at least one more drawFeature event to be called with the ‘locked’ property set to ‘true’: In some renderers, this might make sense to use as a ‘only update local information’ flag.</p></div></div></div>
26 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.size"></a>size</h3><div class=CBody><p>{<a href="BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link20 onMouseOver="ShowTip(event, 'tt2', 'link20')" onMouseOut="HideTip('tt2')">OpenLayers.Size</a>}</p></div></div></div>
28 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.resolution"></a>resolution</h3><div class=CBody><p>{Float} cache of current map resolution</p></div></div></div>
30 <div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.map"></a>map</h3><div class=CBody><p>{<a href="Map-js.html#OpenLayers.Map" class=LClass id=link21 onMouseOver="ShowTip(event, 'tt3', 'link21')" onMouseOut="HideTip('tt3')">OpenLayers.Map</a>} Reference to the map -- this is set in Vector’s setMap()</p></div></div></div>
32 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Constructor"></a>Constructor</h3></div></div>
34 <div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.OpenLayers.Renderer"></a>OpenLayers.<wbr>Renderer</h3><div class=CBody><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>containerID</td><td class=CDLDescription>{<a href="BaseTypes-js.html#OpenLayers.String" class=LClass id=link22 onMouseOver="ShowTip(event, 'tt19', 'link22')" onMouseOut="HideTip('tt19')">String</a>}</td></tr><tr><td class=CDLEntry>options</td><td class=CDLDescription>{Object} options for this renderer. See sublcasses for supported options.</td></tr></table></div></div></div>
36 <div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Functions"></a>Functions</h3></div></div>
38 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.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></div></div></div>
40 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.supported"></a>supported</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>supported: function()</td></tr></table></blockquote><p>This should be overridden by specific subclasses</p><h4 class=CHeading>Returns</h4><p>{Boolean} Whether or not the browser supports the renderer class</p></div></div></div>
42 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.setExtent"></a>setExtent</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>setExtent: function(</td><td class=PParameter nowrap>extent,</td></tr><tr><td></td><td class=PParameter nowrap>resolutionChanged</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Set the visible part of the layer.</p><p>Resolution has probably changed, so we nullify the resolution cache (this.resolution) -- this way it will be re-computed when next it is needed. We nullify the resolution cache (this.resolution) if resolutionChanged is set to true - this way it will be re-computed on the next getResolution() request.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>extent</td><td class=CDLDescription>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link23 onMouseOver="ShowTip(event, 'tt1', 'link23')" onMouseOut="HideTip('tt1')">OpenLayers.Bounds</a>}</td></tr><tr><td class=CDLEntry>resolutionChanged</td><td class=CDLDescription>{Boolean}</td></tr></table></div></div></div>
44 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.setSize"></a>setSize</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>setSize: function(</td><td class=PParameter nowrap>size</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Sets the size of the drawing surface.</p><p>Resolution has probably changed, so we nullify the resolution cache (this.resolution) -- this way it will be re-computed when next it is needed.</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=link24 onMouseOver="ShowTip(event, 'tt2', 'link24')" onMouseOut="HideTip('tt2')">OpenLayers.Size</a>}</td></tr></table></div></div></div>
46 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.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>Uses cached copy of resolution if available to minimize computing</p><h4 class=CHeading>Returns</h4><p>The current map’s resolution</p></div></div></div>
48 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.drawFeature"></a>drawFeature</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>drawFeature: function(</td><td class=PParameter nowrap>feature,</td></tr><tr><td></td><td class=PParameter nowrap>style</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Draw the feature. The optional style argument can be used to override the feature’s own style. This method should only be called from layer.drawFeature().</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>feature</td><td class=CDLDescription>{<a href="Feature/Vector-js.html#OpenLayers.Feature.Vector" class=LClass id=link25 onMouseOver="ShowTip(event, 'tt20', 'link25')" onMouseOut="HideTip('tt20')">OpenLayers.Feature.Vector</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{<Object>}</td></tr></table><h4 class=CHeading>Returns</h4><p>{Boolean} true if the feature has been drawn completely, false if not, undefined if the feature had no geometry</p></div></div></div>
50 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.drawGeometry"></a>drawGeometry</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>drawGeometry: function(</td><td class=PParameter nowrap>geometry,</td></tr><tr><td></td><td class=PParameter nowrap>style,</td></tr><tr><td></td><td class=PParameter nowrap>featureId</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Draw a geometry. This should only be called from the renderer itself. Use layer.drawFeature() from outside the renderer. virtual function</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="Geometry-js.html#OpenLayers.Geometry" class=LClass id=link26 onMouseOver="ShowTip(event, 'tt21', 'link26')" onMouseOut="HideTip('tt21')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object}</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{<a href="BaseTypes-js.html#OpenLayers.String" class=LClass id=link27 onMouseOver="ShowTip(event, 'tt19', 'link27')" onMouseOut="HideTip('tt19')">String</a>}</td></tr></table></div></div></div>
52 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.drawText"></a>drawText</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>drawText: function(</td><td class=PParameter nowrap>featureId,</td></tr><tr><td></td><td class=PParameter nowrap>style,</td></tr><tr><td></td><td class=PParameter nowrap>location</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Function for drawing text labels. This method is only called by the renderer itself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String} style -</td></tr><tr><td class=CDLEntry>location</td><td class=CDLDescription>{<a href="Geometry/Point-js.html#OpenLayers.Geometry.Point" class=LClass id=link28 onMouseOver="ShowTip(event, 'tt22', 'link28')" onMouseOut="HideTip('tt22')">OpenLayers.Geometry.Point</a>}</td></tr></table></div></div></div>
54 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.removeText"></a>removeText</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>removeText: function(</td><td class=PParameter nowrap>featureId</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Function for removing text labels. This method is only called by the renderer itself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>
56 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.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 all vectors from the renderer. virtual function.</p></div></div></div>
58 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.getFeatureIdFromEvent"></a>getFeatureIdFromEvent</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>getFeatureIdFromEvent: function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Returns a feature id from an event on the renderer. How this happens is specific to the renderer. This should be called from layer.getFeatureFromEvent(). Virtual function.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>evt</td><td class=CDLDescription>{<a href="Events-js.html#OpenLayers.Event" class=LClass id=link29 onMouseOver="ShowTip(event, 'tt23', 'link29')" onMouseOut="HideTip('tt23')">OpenLayers.Event</a>}</td></tr></table><h4 class=CHeading>Returns</h4><p>{String} A feature id or null.</p></div></div></div>
60 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.eraseFeatures"></a>eraseFeatures</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>eraseFeatures: function(</td><td class=PParameter nowrap>features</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>This is called by the layer to erase features</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>features</td><td class=CDLDescription>{Array(<a href="Feature/Vector-js.html#OpenLayers.Feature.Vector" class=LClass id=link30 onMouseOver="ShowTip(event, 'tt20', 'link30')" onMouseOut="HideTip('tt20')">OpenLayers.Feature.Vector</a>)}</td></tr></table></div></div></div>
62 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.eraseGeometry"></a>eraseGeometry</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>eraseGeometry: function(</td><td class=PParameter nowrap>geometry</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>Remove a geometry from the renderer (by id). virtual function.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="Geometry-js.html#OpenLayers.Geometry" class=LClass id=link31 onMouseOver="ShowTip(event, 'tt21', 'link31')" onMouseOut="HideTip('tt21')">OpenLayers.Geometry</a>}</td></tr></table></div></div></div>
64 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.moveRoot"></a>moveRoot</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>moveRoot: function(</td><td class=PParameter nowrap>renderer</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote><p>moves this renderer’s root to a (different) renderer. To be implemented by subclasses that require a common renderer root for feature selection.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>renderer</td><td class=CDLDescription>{<a href="#OpenLayers.Renderer.OpenLayers.Renderer" class=LConstructor >OpenLayers.Renderer</a>} target renderer for the moved root</td></tr></table></div></div></div>
66 <div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.getRenderLayerId"></a>getRenderLayerId</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>getRenderLayerId: function()</td></tr></table></blockquote><p>Gets the layer that this renderer’s output appears on. If moveRoot was used, this will be different from the id of the layer containing the features rendered by this renderer.</p><h4 class=CHeading>Returns</h4><p>{String} the id of the output layer.</p></div></div></div>
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81 <!--START_ND_TOOLTIPS-->
82 <div class=CToolTip id="tt1"><div class=CClass>Instances of this class represent bounding boxes. </div></div><div class=CToolTip id="tt2"><div class=CClass>Instances of this class represent a width/height pair</div></div><div class=CToolTip id="tt3"><div class=CClass>Instances of OpenLayers.Map are interactive maps embedded in a web page. </div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>destroy: function()</td></tr></table></blockquote></div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>supported: function()</td></tr></table></blockquote>This should be overridden by specific subclasses</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>setExtent: function(</td><td class=PParameter nowrap>extent,</td></tr><tr><td></td><td class=PParameter nowrap>resolutionChanged</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Set the visible part of the layer.</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>setSize: function(</td><td class=PParameter nowrap>size</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the size of the drawing surface.</div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>getResolution: function()</td></tr></table></blockquote>Uses cached copy of resolution if available to minimize computing</div></div><div class=CToolTip id="tt9"><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>drawFeature: function(</td><td class=PParameter nowrap>feature,</td></tr><tr><td></td><td class=PParameter nowrap>style</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Draw the feature. </div></div><div class=CToolTip id="tt10"><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>drawGeometry: function(</td><td class=PParameter nowrap>geometry,</td></tr><tr><td></td><td class=PParameter nowrap>style,</td></tr><tr><td></td><td class=PParameter nowrap>featureId</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Draw a geometry. </div></div><div class=CToolTip id="tt11"><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>drawText: function(</td><td class=PParameter nowrap>featureId,</td></tr><tr><td></td><td class=PParameter nowrap>style,</td></tr><tr><td></td><td class=PParameter nowrap>location</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Function for drawing text labels. </div></div><div class=CToolTip id="tt12"><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>removeText: function(</td><td class=PParameter nowrap>featureId</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Function for removing text labels. </div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>clear: function()</td></tr></table></blockquote>Clear all vectors from the renderer. </div></div><div class=CToolTip id="tt14"><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>getFeatureIdFromEvent: function(</td><td class=PParameter nowrap>evt</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Returns a feature id from an event on the renderer. </div></div><div class=CToolTip id="tt15"><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>eraseFeatures: function(</td><td class=PParameter nowrap>features</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>This is called by the layer to erase features</div></div><div class=CToolTip id="tt16"><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>eraseGeometry: function(</td><td class=PParameter nowrap>geometry</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>Remove a geometry from the renderer (by id). </div></div><div class=CToolTip id="tt17"><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>moveRoot: function(</td><td class=PParameter nowrap>renderer</td><td class=PAfterParameters nowrap>)</td></tr></table></td></tr></table></blockquote>moves this renderer’s root to a (different) renderer. </div></div><div class=CToolTip id="tt18"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class=Prototype><tr><td>getRenderLayerId: function()</td></tr></table></blockquote>Gets the layer that this renderer’s output appears on. </div></div><div class=CToolTip id="tt19"><div class=CClass>Contains convenience functions for string manipulation.</div></div><div class=CToolTip id="tt20"><div class=CClass>Vector features use the OpenLayers.Geometry classes as geometry description. </div></div><div class=CToolTip id="tt21"><div class=CClass>A Geometry is a description of a geographic object. </div></div><div class=CToolTip id="tt22"><div class=CClass>Point geometry class.</div></div><div class=CToolTip id="tt23"><div class=CClass>Utility functions for event handling.</div></div><!--END_ND_TOOLTIPS-->
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