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<td >Qt 5.9</td><td ><a href="qtcanvas3d-index.html">Qt Canvas 3D</a></td><td ><a href="qtcanvas3d-examples.html">Qt Canvas 3D Examples</a></td><td >Interaction Example</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#the-controls">The Controls</a></li>
<li class="level1"><a href="#interaction">Interaction</a></li>
<li class="level1"><a href="#three-ways-of-drawing">Three Ways of Drawing</a></li>
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<h1 class="title">Interaction Example</h1>
<span class="subtitle"></span>
<!-- $$$interaction-description -->
<div class="descr"> <a name="details"></a>
<p>The Interaction Example concentrates on the interaction between Qt Quick Controls and the objects displayed in <a href="qml-qtcanvas3d-canvas3d.html">Canvas3D</a>. This also demonstrates drawing the same object in three different ways.</p>
<p class="centerAlign"><img src="images/interaction-example.png" alt="" /></p><a name="the-controls"></a>
<h2 id="the-controls">The Controls</h2>
<p>First, we need to import Qt Quick Controls and Layouts:</p>
<pre class="qml">
import QtQuick.Controls 1.0
import QtQuick.Layouts 1.0
</pre>
<p>Then, we add a RowLayout to the main component to easily add the controls side-by-side:</p>
<pre class="qml">
<span class="type">RowLayout</span> {
<span class="name">id</span>: <span class="name">controlLayout</span>
<span class="name">spacing</span>: <span class="number">5</span>
<span class="name">x</span>: <span class="number">12</span>
<span class="name">y</span>: <span class="name">parent</span>.<span class="name">height</span> <span class="operator">-</span> <span class="number">100</span>
<span class="name">width</span>: <span class="name">parent</span>.<span class="name">width</span> <span class="operator">-</span> (<span class="number">2</span> <span class="operator">*</span> <span class="name">x</span>)
<span class="name">height</span>: <span class="number">100</span>
<span class="name">visible</span>: <span class="number">true</span>
</pre>
<p>And then we add three sliders to the layout. Here's the one for controlling x-axis rotation:</p>
<pre class="qml">
<span class="type">Slider</span> {
<span class="name">id</span>: <span class="name">xSlider</span>
<span class="name">Layout</span>.alignment: <span class="name">Qt</span>.<span class="name">AlignLeft</span>
<span class="name">Layout</span>.fillWidth: <span class="number">true</span>
<span class="name">minimumValue</span>: <span class="number">0</span>;
<span class="name">maximumValue</span>: <span class="number">360</span>;
<span class="name">onValueChanged</span>: <span class="name">canvas3d</span>.<span class="name">xRotSlider</span> <span class="operator">=</span> <span class="name">value</span>;
}
</pre>
<a name="interaction"></a>
<h2 id="interaction">Interaction</h2>
<p>First we need to define some properties in the <a href="qml-qtcanvas3d-canvas3d.html">Canvas3D</a> for the rotations:</p>
<pre class="qml">
property <span class="type">double</span> <span class="name">xRotSlider</span>: <span class="number">0</span>
property <span class="type">double</span> <span class="name">yRotSlider</span>: <span class="number">0</span>
property <span class="type">double</span> <span class="name">zRotSlider</span>: <span class="number">0</span>
</pre>
<p>The <code>onValueChanged</code> signal handlers of the Slider components are connected to the above properties. Here's the connection in x-rotation slider as an example:</p>
<pre class="qml">
<span class="name">onValueChanged</span>: <span class="name">canvas3d</span>.<span class="name">xRotSlider</span> <span class="operator">=</span> <span class="name">value</span>;
</pre>
<p>Then, on the JavaScript side, we just use the <a href="qml-qtcanvas3d-canvas3d.html">Canvas3D</a> properties directly when setting the modelview matrix rotations:</p>
<pre class="js">
<span class="name">mvMatrix</span> <span class="operator">=</span> <span class="name">mat4</span>.<span class="name">rotate</span>(<span class="name">mvMatrix</span>, <span class="name">mvMatrix</span>, <span class="name">degToRad</span>(<span class="name">canvas</span>.<span class="name">xRotSlider</span>), [<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>]);
<span class="name">mvMatrix</span> <span class="operator">=</span> <span class="name">mat4</span>.<span class="name">rotate</span>(<span class="name">mvMatrix</span>, <span class="name">mvMatrix</span>, <span class="name">degToRad</span>(<span class="name">canvas</span>.<span class="name">yRotSlider</span>), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>]);
<span class="name">mvMatrix</span> <span class="operator">=</span> <span class="name">mat4</span>.<span class="name">rotate</span>(<span class="name">mvMatrix</span>, <span class="name">mvMatrix</span>, <span class="name">degToRad</span>(<span class="name">canvas</span>.<span class="name">zRotSlider</span>), [<span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>]);
</pre>
<a name="three-ways-of-drawing"></a>
<h2 id="three-ways-of-drawing">Three Ways of Drawing</h2>
<p>The actual drawing is no different from any situation where the same object is drawn multiple times. Only in this case we use a different drawing mode for each:</p>
<pre class="js">
<span class="name">gl</span>.<span class="name">drawElements</span>(<span class="name">gl</span>.<span class="name">TRIANGLES</span>, <span class="name">theModel</span>.<span class="name">count</span>, <span class="name">gl</span>.<span class="name">UNSIGNED_SHORT</span>, <span class="number">0</span>);
...
<span class="name">gl</span>.<span class="name">drawElements</span>(<span class="name">gl</span>.<span class="name">POINTS</span>, <span class="name">theModel</span>.<span class="name">count</span>, <span class="name">gl</span>.<span class="name">UNSIGNED_SHORT</span>, <span class="number">0</span>);
...
<span class="name">gl</span>.<span class="name">drawElements</span>(<span class="name">gl</span>.<span class="name">LINES</span>, <span class="name">theModel</span>.<span class="name">count</span>, <span class="name">gl</span>.<span class="name">UNSIGNED_SHORT</span>, <span class="number">0</span>);
</pre>
<p>Files:</p>
<ul>
<li><a href="qtcanvas3d-interaction-qml-interaction-interaction-js.html">interaction/qml/interaction/interaction.js</a></li>
<li><a href="qtcanvas3d-interaction-qml-interaction-main-qml.html">interaction/qml/interaction/main.qml</a></li>
<li><a href="qtcanvas3d-interaction-main-cpp.html">interaction/main.cpp</a></li>
<li><a href="qtcanvas3d-interaction-interaction-pro.html">interaction/interaction.pro</a></li>
<li><a href="qtcanvas3d-interaction-interaction-qrc.html">interaction/interaction.qrc</a></li>
</ul>
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