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<td >Qt 5.12</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-qmlmodule.html">QML Types</a></td><td >vector4d QML Basic Type</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtquick-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h1 class="title">vector4d QML Basic Type</h1>
<span class="subtitle"></span>
<!-- $$$vector4d-description -->
<div class="descr"> <a name="details"></a>
<p>A vector4d type has x, y, z and w attributes.</p>
<p>A <code>vector4d</code> type has <code>x</code>, <code>y</code>, <code>z</code> and <code>w</code> attributes, otherwise it is similar to the <code>vector3d</code> type. Please see the documentation about the <code>vector3d</code> type for more information.</p>
<p>To create a <code>vector4d</code> value, specify it as a "x,y,z,w" string, or define the components individually, or compose it with the Qt.vector4d() function.</p>
<p>The vector4d type has the following idempotent functions which can be invoked in QML:</p>
<div class="table"><table class="generic">
<thead><tr class="qt-style"><th >Function Signature</th><th >Description</th><th >Example</th></tr></thead>
<tr valign="top" class="odd"><td >real dotProduct(vector4d other)</td><td >Returns the scalar real result of the dot product of <code>this</code> vector4d with the <code>other</code> vector4d</td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">5</span><span class="operator">,</span><span class="number">6</span><span class="operator">,</span><span class="number">7</span><span class="operator">,</span><span class="number">8</span>);
var c <span class="operator">=</span> a<span class="operator">.</span>dotProduct(b);
console<span class="operator">.</span>log(c); <span class="comment">// 70</span>
</pre>
</td></tr>
<tr valign="top" class="even"><td >vector4d times(matrix4x4 matrix)</td><td >Returns the vector4d result of transforming <code>this</code> vector4d with the 4x4 <code>matrix</code> with the matrix applied post-vector</td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>matrix4x4(<span class="number">4</span><span class="operator">,</span><span class="number">5</span><span class="operator">,</span><span class="number">6</span><span class="operator">,</span><span class="number">7</span><span class="operator">,</span><span class="number">8</span><span class="operator">,</span><span class="number">9</span><span class="operator">,</span><span class="number">10</span><span class="operator">,</span><span class="number">11</span><span class="operator">,</span><span class="number">12</span><span class="operator">,</span><span class="number">13</span><span class="operator">,</span><span class="number">14</span><span class="operator">,</span><span class="number">15</span><span class="operator">,</span><span class="number">16</span><span class="operator">,</span><span class="number">17</span><span class="operator">,</span><span class="number">18</span><span class="operator">,</span><span class="number">19</span>);
var c <span class="operator">=</span> a<span class="operator">.</span>times(b);
console<span class="operator">.</span>log(c<span class="operator">.</span>toString()); <span class="comment">// QVector4D(120, 130, 140, 150)</span>
</pre>
</td></tr>
<tr valign="top" class="odd"><td >vector4d times(vector4d other)</td><td >Returns the vector4d result of multiplying <code>this</code> vector4d with the <code>other</code> vector4d</td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">5</span><span class="operator">,</span><span class="number">6</span><span class="operator">,</span><span class="number">7</span><span class="operator">,</span><span class="number">8</span>);
var c <span class="operator">=</span> a<span class="operator">.</span>times(b);
console<span class="operator">.</span>log(c<span class="operator">.</span>toString()); <span class="comment">// QVector4D(5, 12, 21, 32)</span>
</pre>
</td></tr>
<tr valign="top" class="even"><td >vector4d times(real factor)</td><td >Returns the vector4d result of multiplying <code>this</code> vector4d with the scalar <code>factor</code></td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> <span class="number">4.48</span>;
var c <span class="operator">=</span> a<span class="operator">.</span>times(b);
console<span class="operator">.</span>log(c<span class="operator">.</span>toString()); <span class="comment">// QVector3D(4.48, 8.96,</span>
<span class="number">13.44</span><span class="operator">,</span> <span class="number">17.92</span>)
</pre>
</td></tr>
<tr valign="top" class="odd"><td >vector4d plus(vector4d other)</td><td >Returns the vector4d result of the addition of <code>this</code> vector4d with the <code>other</code> vector4d</td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">5</span><span class="operator">,</span><span class="number">6</span><span class="operator">,</span><span class="number">7</span><span class="operator">,</span><span class="number">8</span>);
var c <span class="operator">=</span> a<span class="operator">.</span>plus(b);
console<span class="operator">.</span>log(c<span class="operator">.</span>toString()); <span class="comment">// QVector4D(6, 8, 10, 12)</span>
</pre>
</td></tr>
<tr valign="top" class="even"><td >vector4d minus(vector4d other)</td><td >Returns the vector4d result of the subtraction of <code>other</code> vector4d from <code>this</code> vector4d</td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">5</span><span class="operator">,</span><span class="number">6</span><span class="operator">,</span><span class="number">7</span><span class="operator">,</span><span class="number">8</span>);
var c <span class="operator">=</span> a<span class="operator">.</span>minus(b);
console<span class="operator">.</span>log(c<span class="operator">.</span>toString()); <span class="comment">// QVector4D(-4, -4, -4, -4)</span>
</pre>
</td></tr>
<tr valign="top" class="odd"><td >vector4d normalized()</td><td >Returns the normalized form of <code>this</code> vector</td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> a<span class="operator">.</span>normalized();
console<span class="operator">.</span>log(b<span class="operator">.</span>toString());
<span class="comment">// QVector4D(0.182574, 0.365148, 0.547723, 0.730297)</span>
</pre>
</td></tr>
<tr valign="top" class="even"><td >real length()</td><td >Returns the scalar real value of the length of <code>this</code> vector3d</td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> a<span class="operator">.</span>length();
console<span class="operator">.</span>log(b<span class="operator">.</span>toString()); <span class="comment">// 5.477225575051661</span>
</pre>
</td></tr>
<tr valign="top" class="odd"><td >vector2d toVector2d()</td><td >Returns the vector2d result of converting <code>this</code> vector4d to a vector2d</td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> a<span class="operator">.</span>toVector2d();
console<span class="operator">.</span>log(b<span class="operator">.</span>toString()); <span class="comment">// QVector2D(1, 2)</span>
</pre>
</td></tr>
<tr valign="top" class="even"><td >vector3d toVector3d()</td><td >Returns the vector3d result of converting <code>this</code> vector4d to a vector3d</td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> a<span class="operator">.</span>toVector3d();
console<span class="operator">.</span>log(b<span class="operator">.</span>toString()); <span class="comment">// QVector3D(1, 2, 3)</span>
</pre>
</td></tr>
<tr valign="top" class="odd"><td >bool fuzzyEquals(vector4d other, real epsilon)</td><td >Returns true if <code>this</code> vector4d is approximately equal to the <code>other</code> vector4d. The approximation will be true if each attribute of <code>this</code> is within <code>epsilon</code> of <code>other</code>. Note that <code>epsilon</code> is an optional argument, the default <code>epsilon</code> is 0.00001.</td><td ><pre class="cpp">
var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span><span class="operator">,</span><span class="number">3</span><span class="operator">,</span><span class="number">4</span>);
var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector4d(<span class="number">1.0001</span><span class="operator">,</span> <span class="number">1.9998</span><span class="operator">,</span> <span class="number">2.0001</span><span class="operator">,</span> <span class="number">3.9999</span>);
var c <span class="operator">=</span> a<span class="operator">.</span>fuzzyEquals(b); <span class="comment">// default epsilon</span>
var d <span class="operator">=</span> a<span class="operator">.</span>fuzzyEquals(b<span class="operator">,</span> <span class="number">0.005</span>); <span class="comment">// supplied epsilon</span>
console<span class="operator">.</span>log(c <span class="operator">+</span> <span class="string">" "</span> <span class="operator">+</span> d); <span class="comment">// false true</span>
</pre>
</td></tr>
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<p>This basic type is provided by the <a href="qtquick-module.html">QtQuick</a> import.</p>
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<p><b>See also </b>QML Basic Types.</p>
<!-- @@@vector4d -->
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