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  <title>Qt Mobility 1.2: QGeoMapCustomObject Class Reference</title>
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    <a href="index.html" class="qtref"><span>QtMobility Reference Documentation</span></a>
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<li><a href="modules.html">Modules</a></li>
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<li>QGeoMapCustomObject</li>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#signals">Signals</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
<li class="level2"><a href="#units-and-coordinates">Units and coordinates</a></li>
<li class="level2"><a href="#transform-methods">Transform methods</a></li>
<li class="level2"><a href="#caveats">Caveats</a></li>
</ul>
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<h1 class="title">QGeoMapCustomObject Class Reference</h1>
<!-- $$$QGeoMapCustomObject-brief -->
<p>The QGeoMapCustomObject class is a <a href="qgeomapobject.html">QGeoMapObject</a> used to draw a <a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a> on a map. <a href="#details">More...</a></p>
<!-- @@@QGeoMapCustomObject -->
<pre class="cpp"> <span class="preprocessor">#include &lt;QGeoMapCustomObject&gt;</span></pre><p><b>Inherits: </b><a href="qgeomapobject.html">QGeoMapObject</a>.</p>
<p>This class was introduced in Qt Mobility 1.2.</p>
<ul>
<li><a href="qgeomapcustomobject-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li class="fn"><b><a href="qgeomapcustomobject.html#graphicsItem-prop">graphicsItem</a></b> : QGraphicsItem *</li>
<li class="fn"><b><a href="qgeomapcustomobject.html#offset-prop">offset</a></b> : QPoint</li>
</ul>
<ul>
<li class="fn">6 properties inherited from <a href="qgeomapobject.html#properties">QGeoMapObject</a></li>
<li class="fn">1 property inherited from <a href="http://qt.nokia.com/doc/4.7/qobject.html#properties">QObject</a></li>
</ul>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#QGeoMapCustomObject">QGeoMapCustomObject</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#QGeoMapCustomObject-2">QGeoMapCustomObject</a></b> ( const QGeoCoordinate &amp; <i>coordinate</i>, const QPoint &amp; <i>offset</i> = QPoint( 0, 0 ) )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#dtor.QGeoMapCustomObject">~QGeoMapCustomObject</a></b> ()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QGraphicsItem * </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#graphicsItem-prop">graphicsItem</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QPoint </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#offset-prop">offset</a></b> () const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#graphicsItem-prop">setGraphicsItem</a></b> ( QGraphicsItem * <i>graphicsItem</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#offset-prop">setOffset</a></b> ( const QPoint &amp; <i>offset</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#setOrigin">setOrigin</a></b> ( const QGeoCoordinate &amp; <i>origin</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#setTransformType">setTransformType</a></b> ( const TransformType &amp; <i>type</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#setUnits">setUnits</a></b> ( const CoordinateUnit &amp; <i>unit</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#update">update</a></b> ()</td></tr>
</table>
<a name="reimplemented-public-functions"></a>
<h2>Reimplemented Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> virtual QGeoMapObject::Type </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#type">type</a></b> () const</td></tr>
</table>
<ul>
<li class="fn">15 public functions inherited from <a href="qgeomapobject.html#public-functions">QGeoMapObject</a></li>
<li class="fn">29 public functions inherited from <a href="http://qt.nokia.com/doc/4.7/qobject.html#public-functions">QObject</a></li>
</ul>
<a name="signals"></a>
<h2>Signals</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#graphicsItemChanged">graphicsItemChanged</a></b> ( QGraphicsItem * <i>graphicsItem</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#offsetChanged">offsetChanged</a></b> ( const QPoint &amp; <i>offset</i> )</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgeomapcustomobject.html#triggerUpdate">triggerUpdate</a></b> ()</td></tr>
</table>
<ul>
<li class="fn">6 signals inherited from <a href="qgeomapobject.html#signals">QGeoMapObject</a></li>
<li class="fn">1 signal inherited from <a href="http://qt.nokia.com/doc/4.7/qobject.html#signals">QObject</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 public slot inherited from <a href="http://qt.nokia.com/doc/4.7/qobject.html#public-slots">QObject</a></li>
<li class="fn">1 public variable inherited from <a href="http://qt.nokia.com/doc/4.7/qobject.html#public-variables">QObject</a></li>
<li class="fn">4 static public members inherited from <a href="http://qt.nokia.com/doc/4.7/qobject.html#static-public-members">QObject</a></li>
<li class="fn">3 protected functions inherited from <a href="qgeomapobject.html#protected-functions">QGeoMapObject</a></li>
<li class="fn">7 protected functions inherited from <a href="http://qt.nokia.com/doc/4.7/qobject.html#protected-functions">QObject</a></li>
<li class="fn">2 protected variables inherited from <a href="http://qt.nokia.com/doc/4.7/qobject.html#protected-variables">QObject</a></li>
</ul>
<a name="details"></a>
<!-- $$$QGeoMapCustomObject-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QGeoMapCustomObject class is a <a href="qgeomapobject.html">QGeoMapObject</a> used to draw a <a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a> on a map.</p>
<p>Any arbitrary <a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a> can be associated with a QGeoMapCustomObject, and to this end it contains support for interpreting the coordinates of the <a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a> in a variety of different ways.</p>
<p>For example, the following code creates a <a href="http://qt.nokia.com/doc/4.7/qgraphicsellipseitem.html">QGraphicsEllipseItem</a> and a QGeoMapCustomObject to display it. The EllipseItem extends from the origin point, out 20 meters to the east and 30 metres south.</p>
<pre class="cpp"> <span class="type"><a href="http://qt.nokia.com/doc/4.7/qgraphicsellipseitem.html">QGraphicsEllipseItem</a></span> <span class="operator">*</span>ellipseItem <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="http://qt.nokia.com/doc/4.7/qgraphicsellipseitem.html">QGraphicsEllipseItem</a></span>;
 ellipseItem<span class="operator">-</span><span class="operator">&gt;</span>setRect(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">20</span><span class="operator">,</span> <span class="number">30</span>);

 <span class="type">QGeoMapCustomObject</span> <span class="operator">*</span>mapObject <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGeoMapCustomObject</span>;
 mapObject<span class="operator">-</span><span class="operator">&gt;</span><a href="qgeomapcustomobject.html#graphicsItem-prop">setGraphicsItem</a>(ellipseItem);
 mapObject<span class="operator">-</span><span class="operator">&gt;</span><a href="qgeomapcustomobject.html#setUnits">setUnits</a>(<span class="type"><a href="qgeomapobject.html">QGeoMapObject</a></span><span class="operator">::</span>MeterUnit);
 mapObject<span class="operator">-</span><span class="operator">&gt;</span><a href="qgeomapcustomobject.html#setOrigin">setOrigin</a>(<span class="type"><a href="qgeocoordinate.html">QGeoCoordinate</a></span>(<span class="operator">-</span><span class="number">27.5796</span><span class="operator">,</span> <span class="number">153.1</span>));</pre>
<a name="units-and-coordinates"></a>
<h4>Units and coordinates</h4>
<p>The local units and coordinates of the <a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a> are transformed onto the map based on the <i>units</i>, <i>origin</i>, <i>transformType</i> and <i>transform</i> properties. Several systems are available, including pixels, meters and seconds of arc.</p>
<p>It should be noted that both pixel and meter coordinate systems are south- oriented (ie, positive Y axis faces south on the map). However, the RelativeArcSeconds unit system faces north to align with the standard latitude grid. The Y axis can be flipped if necessary by making use of the GraphicsItem's <i>transform</i> property</p>
<pre class="cpp"> <span class="type"><a href="http://qt.nokia.com/doc/4.7/qtransform.html">QTransform</a></span> northFlip;
 northFlip<span class="operator">.</span>scale(<span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>);

 ellipseItem<span class="operator">-</span><span class="operator">&gt;</span>setTransform(northFlip);</pre>
<a name="transform-methods"></a>
<h4>Transform methods</h4>
<p>Normally, the GraphicsItem will be transformed into map coordinates using a bilinear interpolation. Another option is the <a href="qgeomapobject.html#TransformType-enum">ExactTransform</a>, which converts the GraphicsItem exactly into map coordinates, but is only available for certain subclasses of <a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a>. Other interpolation methods may be provided in future for greater accuracy near poles and in different map projections, without the limitations of <a href="qgeomapobject.html#TransformType-enum">ExactTransform</a>.</p>
<p>Calling <a href="qgeomapcustomobject.html#setUnits">setUnits</a>() or setting the units property will result in the default value of <a href="qgeomapobject.html#transformType-prop">transformType</a> being restored. See <a href="qgeomapobject.html#transformType-prop">QGeoMapObject::transformType</a> for more details.</p>
<a name="caveats"></a>
<h4>Caveats</h4>
<p>Other than the coordinate system features, there are a few differences with using QGraphicsItems on a map compared to using them on a standard <a href="http://qt.nokia.com/doc/4.7/qgraphicsscene.html">QGraphicsScene</a>. One of the most important of these is the use of the <i>update()</i> function. When an application changes anything that has an effect upon the appearance, size, shape etc of the <a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a>, it must call <i>QGeoMapCustomObject::update()</i> to ensure that the map is updated.</p>
<p>Another is the use of child items of a <a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a>. These are supported in more or less the same manner as in <a href="http://qt.nokia.com/doc/4.7/qgraphicsscene.html">QGraphicsScene</a>, with the exception of use in concert with <i>ExactTransform</i> -- any object with <a href="qgeomapobject.html#transformType-prop">transformType</a> set to <i>ExactTransform</i> will not have children of its <a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a> drawn on the map.</p>
</div>
<!-- @@@QGeoMapCustomObject -->
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$graphicsItem-prop$$$graphicsItem$$$setGraphicsItemQGraphicsItem*$$$graphicsItemChangedQGraphicsItem* -->
<h3 class="fn"><a name="graphicsItem-prop"></a><span class="name">graphicsItem</span> : <span class="type"><a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a></span> *</h3>
<p>This property holds the graphics item which will be drawn by this custom object.</p>
<p>If the graphics item is 0 then nothing will be drawn.</p>
<p>This property was introduced in Qt Mobility 1.2.</p>
<p><b>Access functions:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> QGraphicsItem * </td><td class="memItemRight bottomAlign"><span class="name"><b>graphicsItem</b></span> () const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setGraphicsItem</b></span> ( QGraphicsItem * <i>graphicsItem</i> )</td></tr>
</table>
<p><b>Notifier signal:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgeomapcustomobject.html#graphicsItemChanged">graphicsItemChanged</a></b></span> ( QGraphicsItem * <i>graphicsItem</i> )</td></tr>
</table>
<!-- @@@graphicsItem -->
<!-- $$$offset-prop$$$offset$$$setOffsetconstQPoint&$$$offsetChangedconstQPoint& -->
<h3 class="fn"><a name="offset-prop"></a><span class="name">offset</span> : <span class="type"><a href="http://qt.nokia.com/doc/4.7/qpoint.html">QPoint</a></span></h3>
<p>This property holds the offset in pixels at which the graphics item will be drawn by this custom object.</p>
<p>The default value of this property is <a href="http://qt.nokia.com/doc/4.7/qpoint.html">QPoint</a>(0, 0). If this value is not changed the upper left coordinate of the graphics item will be drawn at the coordinate specified by QGeoMapCustomObject::coordinate.</p>
<p>The offset is in pixels and is independent of the zoom level of the map.</p>
<p>This property was introduced in Qt Mobility 1.2.</p>
<p><b>Access functions:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> QPoint </td><td class="memItemRight bottomAlign"><span class="name"><b>offset</b></span> () const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setOffset</b></span> ( const QPoint &amp; <i>offset</i> )</td></tr>
</table>
<p><b>Notifier signal:</b></p>
<table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgeomapcustomobject.html#offsetChanged">offsetChanged</a></b></span> ( const QPoint &amp; <i>offset</i> )</td></tr>
</table>
<!-- @@@offset -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QGeoMapCustomObject[overload1]$$$QGeoMapCustomObject -->
<h3 class="fn"><a name="QGeoMapCustomObject"></a>QGeoMapCustomObject::<span class="name">QGeoMapCustomObject</span> ()</h3>
<p>Constructs a new custom object.</p>
<!-- @@@QGeoMapCustomObject -->
<!-- $$$QGeoMapCustomObject$$$QGeoMapCustomObjectconstQGeoCoordinate&constQPoint& -->
<h3 class="fn"><a name="QGeoMapCustomObject-2"></a>QGeoMapCustomObject::<span class="name">QGeoMapCustomObject</span> ( const <span class="type"><a href="qgeocoordinate.html">QGeoCoordinate</a></span> &amp; <i>coordinate</i>, const <span class="type"><a href="http://qt.nokia.com/doc/4.7/qpoint.html">QPoint</a></span> &amp; <i>offset</i> = QPoint( 0, 0 ) )</h3>
<p>Constructs a new custom object which will draw a <a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a> at an offset of <i>offset</i> pixels from the coordinate <i>coordinate</i>.</p>
<p>This function was introduced in Qt Mobility 1.2.</p>
<!-- @@@QGeoMapCustomObject -->
<!-- $$$~QGeoMapCustomObject[overload1]$$$~QGeoMapCustomObject -->
<h3 class="fn"><a name="dtor.QGeoMapCustomObject"></a>QGeoMapCustomObject::<span class="name">~QGeoMapCustomObject</span> ()</h3>
<p>Destroys this custom object.</p>
<!-- @@@~QGeoMapCustomObject -->
<!-- $$$graphicsItemChanged[overload1]$$$graphicsItemChangedQGraphicsItem* -->
<h3 class="fn"><a name="graphicsItemChanged"></a><span class="type">void</span> QGeoMapCustomObject::<span class="name">graphicsItemChanged</span> ( <span class="type"><a href="http://qt.nokia.com/doc/4.7/qgraphicsitem.html">QGraphicsItem</a></span> * <i>graphicsItem</i> )<tt> [signal]</tt></h3>
<p>This signal is emitted when the graphics item which this custom object draws is changed.</p>
<p>The new value will be <i>graphicsItem</i>.</p>
<p>This function was introduced in Qt Mobility 1.2.</p>
<!-- @@@graphicsItemChanged -->
<!-- $$$offsetChanged[overload1]$$$offsetChangedconstQPoint& -->
<h3 class="fn"><a name="offsetChanged"></a><span class="type">void</span> QGeoMapCustomObject::<span class="name">offsetChanged</span> ( const <span class="type"><a href="http://qt.nokia.com/doc/4.7/qpoint.html">QPoint</a></span> &amp; <i>offset</i> )<tt> [signal]</tt></h3>
<p>This signal is emitted when the on-screen offset from the coordinate at which this custom object should be drawn has changed.</p>
<p>The new value will be <i>offset</i>.</p>
<p>This function was introduced in Qt Mobility 1.2.</p>
<!-- @@@offsetChanged -->
<!-- $$$setOrigin[overload1]$$$setOriginconstQGeoCoordinate& -->
<h3 class="fn"><a name="setOrigin"></a><span class="type">void</span> QGeoMapCustomObject::<span class="name">setOrigin</span> ( const <span class="type"><a href="qgeocoordinate.html">QGeoCoordinate</a></span> &amp; <i>origin</i> )</h3>
<p>Sets the origin of the object to <i>origin</i>.</p>
<p>This function was introduced in Qt Mobility 1.2.</p>
<!-- @@@setOrigin -->
<!-- $$$setTransformType[overload1]$$$setTransformTypeconstTransformType& -->
<h3 class="fn"><a name="setTransformType"></a><span class="type">void</span> QGeoMapCustomObject::<span class="name">setTransformType</span> ( const <span class="type"><a href="qgeomapobject.html#TransformType-enum">TransformType</a></span> &amp; <i>type</i> )</h3>
<p>Sets the transform type of the object to <i>type</i>.</p>
<p>This function was introduced in Qt Mobility 1.2.</p>
<!-- @@@setTransformType -->
<!-- $$$setUnits[overload1]$$$setUnitsconstCoordinateUnit& -->
<h3 class="fn"><a name="setUnits"></a><span class="type">void</span> QGeoMapCustomObject::<span class="name">setUnits</span> ( const <span class="type"><a href="qgeomapobject.html#CoordinateUnit-enum">CoordinateUnit</a></span> &amp; <i>unit</i> )</h3>
<p>Sets the coordinate units of the object to <i>unit</i>.</p>
<p>Note that setting this property will reset the <a href="qgeomapobject.html#transformType-prop">transformType</a> property to the default for the units given. For <a href="qgeomapobject.html#CoordinateUnit-enum">PixelUnit</a>, this is <a href="qgeomapobject.html#TransformType-enum">ExactTransform</a>, and for all others, <a href="qgeomapobject.html#TransformType-enum">BilinearTransform</a>.</p>
<p>This function was introduced in Qt Mobility 1.2.</p>
<!-- @@@setUnits -->
<!-- $$$triggerUpdate[overload1]$$$triggerUpdate -->
<h3 class="fn"><a name="triggerUpdate"></a><span class="type">void</span> QGeoMapCustomObject::<span class="name">triggerUpdate</span> ()<tt> [signal]</tt></h3>
<p>This signal indicates that the graphics item has changed and that the map needs to be updated.</p>
<p>This function was introduced in Qt Mobility 1.2.</p>
<!-- @@@triggerUpdate -->
<!-- $$$type[overload1]$$$type -->
<h3 class="fn"><a name="type"></a><span class="type"><a href="qgeomapobject.html#Type-enum">QGeoMapObject::Type</a></span> QGeoMapCustomObject::<span class="name">type</span> () const<tt> [virtual]</tt></h3>
<p>Reimplemented from <a href="qgeomapobject.html#type">QGeoMapObject::type</a>().</p>
<p>This function was introduced in Qt Mobility 1.2.</p>
<!-- @@@type -->
<!-- $$$update[overload1]$$$update -->
<h3 class="fn"><a name="update"></a><span class="type">void</span> QGeoMapCustomObject::<span class="name">update</span> ()</h3>
<p>If the graphics item is modified this method should be called immediately afterwards to inform the map that an update is required. &#x2e;</p>
<p>This method causes the <a href="qgeomapcustomobject.html#triggerUpdate">triggerUpdate</a>() signal to be emitted.</p>
<p>This function was introduced in Qt Mobility 1.2.</p>
<!-- @@@update -->
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