<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qmltypereference.qdoc --> <title>vector4d QML Basic Type | Qt Quick 5.9</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.9</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">Qt 5.9.4 Reference Documentation</td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <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> </table></div> <p>This basic type is provided by the <a href="qtquick-module.html">QtQuick</a> import.</p> </div> <p><b>See also </b>QML Basic Types.</p> <!-- @@@vector4d --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>