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<td >Qt 5.9</td><td ><a href="qtsensors-index.html">Qt Sensors</a></td><td ><a href="qtsensors-examples.html">Qt Sensors Examples</a></td><td >Qt Sensors - Maze QML Example</td></tr></table><table class="buildversion"><tr>
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<li class="level2"><a href="#maze-in-qml">Maze in QML</a></li>
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<h1 class="title">Qt Sensors - Maze QML Example</h1>
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<p class="centerAlign"><img src="images/maze.png" alt="" /></p><a name="maze-in-qml"></a>
<h3 >Maze in QML</h3>
<p>To write a QML application that will use the <a href="qml-qtsensors-tiltsensor.html">TiltSensor</a> QML sensors type you need to do the following steps:</p>
<p>Import the <a href="qtsensors-module.html">QtSensors</a> 5.x declarative plugin:</p>
<pre class="qml">
import QtSensors 5.0
</pre>
<p>Add the Sensor QML types into your qml file.</p>
<p>In this example we use the <a href="qml-qtsensors-tiltsensor.html">TiltSensor</a> with values based in degrees and an accuracy of 5 degree:</p>
<pre class="qml">
<span class="type"><a href="qml-qtsensors-tiltsensor.html">TiltSensor</a></span> {
<span class="name">id</span>: <span class="name">tiltSensor</span>
<span class="name">active</span>: <span class="number">true</span>
}
</pre>
<p>Starting the sensor can be done by setting the 'enabled' property to true:</p>
<pre class="qml">
<span class="name">onTriggered</span>: {
<span class="keyword">if</span> (!<span class="name">tiltSensor</span>.<span class="name">enabled</span>)
<span class="name">tiltSensor</span>.<span class="name">active</span> <span class="operator">=</span> <span class="number">true</span>;
</pre>
<p>The mouse should move by a factor of the tilt value:</p>
<pre class="qml">
var <span class="name">xstep</span> = <span class="number">0</span>;
<span class="name">xstep</span> <span class="operator">=</span> <span class="name">tiltSensor</span>.<span class="name">reading</span>.<span class="name">yRotation</span> <span class="operator">*</span> <span class="number">0.1</span> <span class="comment">//acceleration</span>
var <span class="name">ystep</span> = <span class="number">0</span>;
<span class="name">ystep</span> <span class="operator">=</span> <span class="name">tiltSensor</span>.<span class="name">reading</span>.<span class="name">xRotation</span> <span class="operator">*</span> <span class="number">0.1</span> <span class="comment">//acceleration</span>
</pre>
<p>The walk direction of the mouse takes into account some collision detection:</p>
<pre class="qml">
<span class="keyword">if</span> (<span class="name">xstep</span> <span class="operator"><</span> <span class="number">1</span> <span class="operator">&&</span> <span class="name">xstep</span> <span class="operator">></span> <span class="number">0</span>)
<span class="name">xstep</span> <span class="operator">=</span> <span class="number">0</span>
<span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">xstep</span> <span class="operator">></span> -<span class="number">1</span> <span class="operator">&&</span> <span class="name">xstep</span> <span class="operator"><</span> <span class="number">0</span>)
<span class="name">xstep</span> <span class="operator">=</span> <span class="number">0</span>
<span class="keyword">if</span> (<span class="name">ystep</span> <span class="operator"><</span> <span class="number">1</span> <span class="operator">&&</span> <span class="name">ystep</span> <span class="operator">></span> <span class="number">0</span>)
<span class="name">ystep</span> <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">ystep</span> <span class="operator">></span> -<span class="number">1</span> <span class="operator">&&</span> <span class="name">ystep</span> <span class="operator"><</span> <span class="number">0</span>)
<span class="name">ystep</span> <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">if</span> ((<span class="name">xstep</span> <span class="operator"><</span> <span class="number">0</span> <span class="operator">&&</span> <span class="name">mouseCtrl</span>.<span class="name">x</span> <span class="operator">></span> <span class="number">0</span>
<span class="operator">&&</span> <span class="name">Lib</span>.<span class="name">canMove</span>(<span class="name">mouseCtrl</span>.<span class="name">x</span> <span class="operator">+</span> <span class="name">xstep</span>,<span class="name">mouseCtrl</span>.<span class="name">y</span>))) {
<span class="name">xval</span> <span class="operator">=</span> <span class="name">mouseCtrl</span>.<span class="name">x</span> <span class="operator">+</span> <span class="name">xstep</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">xstep</span> <span class="operator">></span> <span class="number">0</span> <span class="operator">&&</span> <span class="name">mouseCtrl</span>.<span class="name">x</span> <span class="operator"><</span> (<span class="name">Lib</span>.<span class="name">cellDimension</span> <span class="operator">*</span> (<span class="name">Lib</span>.<span class="name">dimension</span> <span class="operator">-</span> <span class="number">1</span>))
<span class="operator">&&</span> <span class="name">Lib</span>.<span class="name">canMove</span>(<span class="name">mouseCtrl</span>.<span class="name">x</span> <span class="operator">+</span> <span class="name">xstep</span>,<span class="name">mouseCtrl</span>.<span class="name">y</span>)) {
<span class="name">xval</span> <span class="operator">=</span> <span class="name">mouseCtrl</span>.<span class="name">x</span> <span class="operator">+</span> <span class="name">xstep</span>;
} <span class="keyword">else</span>
<span class="name">xval</span> <span class="operator">=</span> <span class="name">mouseCtrl</span>.<span class="name">x</span>;
<span class="keyword">if</span> (<span class="name">ystep</span> <span class="operator"><</span> <span class="number">0</span> <span class="operator">&&</span> <span class="name">mouseCtrl</span>.<span class="name">y</span> <span class="operator">></span> <span class="number">0</span>
<span class="operator">&&</span> <span class="name">Lib</span>.<span class="name">canMove</span>(<span class="name">mouseCtrl</span>.<span class="name">x</span>, <span class="name">mouseCtrl</span>.<span class="name">y</span> <span class="operator">+</span> <span class="name">ystep</span>)) {
<span class="name">yval</span> <span class="operator">=</span> <span class="name">mouseCtrl</span>.<span class="name">y</span> <span class="operator">+</span> <span class="name">ystep</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">ystep</span> <span class="operator">></span> <span class="number">0</span> <span class="operator">&&</span> (<span class="name">mouseCtrl</span>.<span class="name">y</span> <span class="operator"><</span> (<span class="name">Lib</span>.<span class="name">cellDimension</span> <span class="operator">*</span> (<span class="name">Lib</span>.<span class="name">dimension</span> <span class="operator">-</span> <span class="number">1</span>)))
<span class="operator">&&</span> <span class="name">Lib</span>.<span class="name">canMove</span>(<span class="name">mouseCtrl</span>.<span class="name">x</span>, <span class="name">mouseCtrl</span>.<span class="name">y</span> <span class="operator">+</span> <span class="name">ystep</span>)) {
<span class="name">yval</span> <span class="operator">=</span> <span class="name">mouseCtrl</span>.<span class="name">y</span> <span class="operator">+</span> <span class="name">ystep</span>;
} <span class="keyword">else</span>
<span class="name">yval</span> <span class="operator">=</span> <span class="name">mouseCtrl</span>.<span class="name">y</span>
<span class="name">mouseCtrl</span>.<span class="name">move</span>(<span class="name">xval</span>, <span class="name">yval</span>);
</pre>
<p>The rotation of the mouse image is determined according to the angle that the mouse is moving.</p>
<pre class="qml">
var <span class="name">a</span> = <span class="name">newy</span> <span class="operator">-</span> <span class="name">mouse</span>.<span class="name">y</span>
var <span class="name">b</span> = <span class="name">newx</span> <span class="operator">-</span> <span class="name">mouse</span>.<span class="name">x</span>
var <span class="name">radians_to_degrees</span> = <span class="number">57.2957795</span>
<span class="name">angle</span> <span class="operator">=</span> <span class="name">Math</span>.<span class="name">atan2</span>(-<span class="name">b</span>, <span class="name">a</span>) <span class="operator">*</span> <span class="name">radians_to_degrees</span>
<span class="keyword">if</span> (<span class="name">angle</span> <span class="operator"><</span> <span class="number">0</span>)
<span class="name">angle</span> <span class="operator">=</span> <span class="number">360</span> <span class="operator">+</span> <span class="name">angle</span>
<span class="name">img</span>.<span class="name">rotation</span> <span class="operator">=</span> <span class="name">angle</span>
<span class="name">mouse</span>.<span class="name">x</span> <span class="operator">=</span> <span class="name">newx</span>;
<span class="name">mouse</span>.<span class="name">y</span> <span class="operator">=</span> <span class="name">newy</span>;
</pre>
<p>Files:</p>
<ul>
<li><a href="qtsensors-maze-congratulation-qml.html">maze/Congratulation.qml</a></li>
<li><a href="qtsensors-maze-labyrinthsquare-qml.html">maze/LabyrinthSquare.qml</a></li>
<li><a href="qtsensors-maze-mouse-qml.html">maze/Mouse.qml</a></li>
<li><a href="qtsensors-maze-lib-js.html">maze/lib.js</a></li>
<li><a href="qtsensors-maze-maze-qml.html">maze/maze.qml</a></li>
<li><a href="qtsensors-maze-android-androidmanifest-xml.html">maze/android/AndroidManifest.xml</a></li>
<li><a href="qtsensors-maze-components-applicationwindow-qml.html">maze/components/ApplicationWindow.qml</a></li>
<li><a href="qtsensors-maze-components-button-qml.html">maze/components/Button.qml</a></li>
<li><a href="qtsensors-maze-main-cpp.html">maze/main.cpp</a></li>
<li><a href="qtsensors-maze-maze-pro.html">maze/maze.pro</a></li>
<li><a href="qtsensors-maze-maze-qrc.html">maze/maze.qrc</a></li>
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<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
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distrib
>
Mageia
>
6
>
x86_64
>
media
>
core-updates
>
by-pkgid
>
aa084d0e0126d94ee0fb846ebdf50e37
>
files
>
307
