<?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>vector2d 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 >vector2d 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">vector2d QML Basic Type</h1> <span class="subtitle"></span> <!-- $$$vector2d-description --> <div class="descr"> <a name="details"></a> <p>A vector2d type has x and y attributes.</p> <p>A <code>vector2d</code> type has <code>x</code> and <code>y</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>vector2d</code> value, specify it as a "x,y" string, or define the components individually, or compose it with the Qt.vector2d() function.</p> <p>The vector2d type has the following idempotent functions which can be invoked in QML:</p> <div class="table"><table class="generic" width="60%"> <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(vector2d other)</td><td >Returns the scalar real result of the dot product of <code>this</code> vector2d with the <code>other</code> vector2d</td><td ><pre class="cpp"> var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span>); var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">3</span><span class="operator">,</span><span class="number">4</span>); var c <span class="operator">=</span> a<span class="operator">.</span>dotProduct(b); console<span class="operator">.</span>log(c); <span class="comment">// 11</span> </pre> </td></tr> <tr valign="top" class="even"><td >vector2d times(vector2d other)</td><td >Returns the vector2d result of multiplying <code>this</code> vector2d with the <code>other</code> vector2d</td><td ><pre class="cpp"> var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span>); var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">3</span><span class="operator">,</span><span class="number">4</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">// QVector2D(3, 8)</span> </pre> </td></tr> <tr valign="top" class="odd"><td >vector2d times(real factor)</td><td >Returns the vector2d result of multiplying <code>this</code> vector2d 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>vector2d(<span class="number">1</span><span class="operator">,</span><span class="number">2</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">// QVector2D(4.48, 8.96)</span> </pre> </td></tr> <tr valign="top" class="even"><td >vector2d plus(vector2d other)</td><td >Returns the vector2d result of the addition of <code>this</code> vector2d with the <code>other</code> vector2d</td><td ><pre class="cpp"> var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span>); var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">3</span><span class="operator">,</span><span class="number">4</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">// QVector2D(4, 6)</span> </pre> </td></tr> <tr valign="top" class="odd"><td >vector2d minus(vector2d other)</td><td >Returns the vector2d result of the subtraction of <code>other</code> vector2d from <code>this</code> vector2d</td><td ><pre class="cpp"> var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span>); var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">3</span><span class="operator">,</span><span class="number">4</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">// QVector2D(-2, -2)</span> </pre> </td></tr> <tr valign="top" class="even"><td >vector2d 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>vector2d(<span class="number">1</span><span class="operator">,</span><span class="number">2</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">// QVector2D(0.447214, 0.894427)</span> </pre> </td></tr> <tr valign="top" class="odd"><td >real length()</td><td >Returns the scalar real value of the length of <code>this</code> vector2d</td><td ><pre class="cpp"> var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">1</span><span class="operator">,</span><span class="number">2</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">// 2.23606797749979</span> </pre> </td></tr> <tr valign="top" class="even"><td >vector3d toVector3d()</td><td >Returns the vector3d result of converting <code>this</code> vector2d to a vector3d</td><td ><pre class="cpp"> var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">1</span><span class="operator">,</span><span class="number">2</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, 0)</span> </pre> </td></tr> <tr valign="top" class="odd"><td >vector4d toVector4d()</td><td >Returns the vector4d result of converting <code>this</code> vector2d to a vector4d</td><td ><pre class="cpp"> var a <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span>); var b <span class="operator">=</span> a<span class="operator">.</span>toVector4d(); console<span class="operator">.</span>log(b<span class="operator">.</span>toString()); <span class="comment">// QVector4D(1, 2, 0, 0)</span> </pre> </td></tr> <tr valign="top" class="even"><td >bool fuzzyEquals(vector2d other, real epsilon)</td><td >Returns true if <code>this</code> vector2d is approximately equal to the <code>other</code> vector2d. 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>vector2d(<span class="number">1</span><span class="operator">,</span><span class="number">2</span>); var b <span class="operator">=</span> <span class="type">Qt</span><span class="operator">.</span>vector2d(<span class="number">1.0001</span><span class="operator">,</span> <span class="number">1.9998</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> <!-- @@@vector2d --> </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>