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<li>Qt 5.2</li>
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Qt 5.2.1 Reference Documentation</li>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#methods">Methods</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
<li class="level2"><a href="#performance">Performance</a></li>
<li class="level2"><a href="#example-usage">Example Usage</a></li>
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<h1 class="title">MapPolyline</h1>
<span class="subtitle"></span>
<!-- $$$MapPolyline-brief -->
<p>The MapPolyline type displays a polyline on a map. <a href="#details">More...</a></p>
<!-- @@@MapPolyline -->
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Import Statement:</td><td class="memItemRight bottomAlign"> </b><tt>import QtLocation 5.0</tt></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt Location 5.0</td></tr></table><ul>
<li><a href="qml-qtlocation-mappolyline-members.html">List of all members, including inherited members</a></li>
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<a name="properties"></a>
<h2>Properties</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtlocation-mappolyline.html#line.color-prop">line.color</a></b></b> : color</li>
<li class="fn"><b><b><a href="qml-qtlocation-mappolyline.html#line.width-prop">line.width</a></b></b> : int</li>
<li class="fn"><b><b><a href="qml-qtlocation-mappolyline.html#path-prop">path</a></b></b> : list<coordinate></li>
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<a name="methods"></a>
<h2>Methods</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtlocation-mappolyline.html#addCoordinate-method">addCoordinate</a></b></b>(coordinate)</li>
<li class="fn"><b><b><a href="qml-qtlocation-mappolyline.html#removeCoordinate-method">removeCoordinate</a></b></b>(coordinate)</li>
</ul>
<!-- $$$MapPolyline-description -->
<a name="details"></a>
<h2>Detailed Description</h2>
<p>The MapPolyline type displays a polyline on a map, specified in terms of an ordered list of coordinates. The coordinates on the path cannot be directly changed after being added to the Polyline. Instead, copy the <a href="qml-qtlocation-mappolyline.html#path-prop">path</a> into a var, modify the copy and reassign the copy back to the <a href="qml-qtlocation-mappolyline.html#path-prop">path</a>.</p>
<pre class="cpp">var path <span class="operator">=</span> mapPolyline<span class="operator">.</span>path;
path<span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">.</span>latitude <span class="operator">=</span> <span class="number">5</span>;
mapPolyline<span class="operator">.</span>path <span class="operator">=</span> path;</pre>
<p>Coordinates can also be added and removed at any time using the <a href="qml-qtlocation-mappolyline.html#addCoordinate-method">addCoordinate</a> and <a href="qml-qtlocation-mappolyline.html#removeCoordinate-method">removeCoordinate</a> methods.</p>
<p>By default, the polyline is displayed as a 1-pixel thick black line. This can be changed using the <a href="qml-qtlocation-mappolyline.html#line.width-prop">line.width</a> and <a href="qml-qtlocation-mappolyline.html#line.color-prop">line.color</a> properties.</p>
<a name="performance"></a>
<h3>Performance</h3>
<p>MapPolylines have a rendering cost that is O(n) with respect to the number of vertices. This means that the per frame cost of having a polyline on the Map grows in direct proportion to the number of points in the polyline.</p>
<p>Like the other map objects, MapPolyline is normally drawn without a smooth appearance. Setting the opacity property will force the object to be blended, which decreases performance considerably depending on the hardware in use.</p>
<p><b>Note: </b>MapPolylines are implemented using the OpenGL GL_LINES primitive. There have been occasional reports of issues and rendering inconsistencies on some (particularly quite old) platforms. No workaround is yet available for these issues.</p><a name="example-usage"></a>
<h3>Example Usage</h3>
<p>The following snippet shows a MapPolyline with 4 points, making a shape like the top part of a "question mark" (?), near Brisbane, Australia. The line drawn is 3 pixels in width and green in color.</p>
<pre class="cpp">Map {
MapPolyline {
line<span class="operator">.</span>width: <span class="number">3</span>
line<span class="operator">.</span>color: <span class="char">'green'</span>
path: <span class="operator">[</span>
{ latitude: <span class="operator">-</span><span class="number">27</span><span class="operator">,</span> longitude: <span class="number">153.0</span> }<span class="operator">,</span>
{ latitude: <span class="operator">-</span><span class="number">27</span><span class="operator">,</span> longitude: <span class="number">154.1</span> }<span class="operator">,</span>
{ latitude: <span class="operator">-</span><span class="number">28</span><span class="operator">,</span> longitude: <span class="number">153.5</span> }<span class="operator">,</span>
{ latitude: <span class="operator">-</span><span class="number">29</span><span class="operator">,</span> longitude: <span class="number">153.5</span> }
<span class="operator">]</span>
}
}</pre>
<p class="centerAlign"><img src="images/api-mappolyline.png" alt="" /></p><!-- @@@MapPolyline -->
<h2>Property Documentation</h2>
<!-- $$$line.color -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="line.color-prop"></a><span class="name">line.color</span> : <span class="type">color</span></p></td></tr></table></div><div class="qmldoc"><p>This property is part of the line property group. The line property group holds the width and color used to draw the line.</p>
<p>The width is in pixels and is independent of the zoom level of the map. The default values correspond to a black border with a width of 1 pixel.</p>
<p>For no line, use a width of 0 or a transparent color.</p>
</div></div><!-- @@@line.color -->
<br/>
<!-- $$$line.width -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="line.width-prop"></a><span class="name">line.width</span> : <span class="type">int</span></p></td></tr></table></div><div class="qmldoc"><p>This property is part of the line property group. The line property group holds the width and color used to draw the line.</p>
<p>The width is in pixels and is independent of the zoom level of the map. The default values correspond to a black border with a width of 1 pixel.</p>
<p>For no line, use a width of 0 or a transparent color.</p>
</div></div><!-- @@@line.width -->
<br/>
<!-- $$$path -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlPropNode"><p><a name="path-prop"></a><span class="name">path</span> : <span class="type">list</span><<span class="type">coordinate</span>></p></td></tr></table></div><div class="qmldoc"><p>This property holds the ordered list of coordinates which define the polyline.</p>
</div></div><!-- @@@path -->
<br/>
<h2>Method Documentation</h2>
<!-- $$$addCoordinate -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlFuncNode"><p><a name="addCoordinate-method"></a><span class="name">addCoordinate</span>(<span class="type">coordinate</span>)</p></td></tr></table></div><div class="qmldoc"><p>Adds a coordinate to the path.</p>
<p><b>See also </b><a href="qml-qtlocation-mappolyline.html#removeCoordinate-method">removeCoordinate</a> and <a href="qml-qtlocation-mappolyline.html#path-prop">path</a>.</p>
</div></div><!-- @@@addCoordinate -->
<br/>
<!-- $$$removeCoordinate -->
<div class="qmlitem"><div class="qmlproto"><table class="qmlname"><tr valign="top" class="odd"><td class="tblQmlFuncNode"><p><a name="removeCoordinate-method"></a><span class="name">removeCoordinate</span>(<span class="type">coordinate</span>)</p></td></tr></table></div><div class="qmldoc"><p>Removes a coordinate from the path. If there are multiple instances of the same coordinate, the one added last is removed.</p>
<p><b>See also </b><a href="qml-qtlocation-mappolyline.html#addCoordinate-method">addCoordinate</a> and <a href="qml-qtlocation-mappolyline.html#path-prop">path</a>.</p>
</div></div><!-- @@@removeCoordinate -->
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