<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>squircle.qml Example File | 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-canvas-example.html">Qt Quick Examples - Canvas</a></td><td >squircle.qml Example File</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="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">squircle.qml Example File</h1> <span class="subtitle">canvas/squircle/squircle.qml</span> <!-- $$$canvas/squircle/squircle.qml-description --> <div class="descr"> <a name="details"></a> <pre class="qml"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> import QtQuick 2.0 import "../contents" import "../../shared" <span class="type"><a href="qml-qtquick-item.html">Item</a></span> { <span class="name">id</span>: <span class="name">container</span> <span class="name">width</span>: <span class="number">320</span> <span class="name">height</span>: <span class="number">480</span> <span class="type"><a href="qml-qtquick-column.html">Column</a></span> { <span class="name">spacing</span>: <span class="number">6</span> <span class="name">anchors</span>.fill: <span class="name">parent</span> <span class="name">anchors</span>.topMargin: <span class="number">12</span> <span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">font</span>.pointSize: <span class="number">24</span> <span class="name">font</span>.bold: <span class="number">true</span> <span class="name">text</span>: <span class="string">"Squircles"</span> <span class="name">anchors</span>.horizontalCenter: <span class="name">parent</span>.<span class="name">horizontalCenter</span> <span class="name">color</span>: <span class="string">"#777"</span> } <span class="type"><a href="qml-qtquick-image.html">Image</a></span> { <span class="name">anchors</span>.horizontalCenter: <span class="name">parent</span>.<span class="name">horizontalCenter</span> <span class="name">source</span>: <span class="string">"squircle.png"</span> <span class="name">width</span>: <span class="number">250</span> <span class="name">height</span>: <span class="number">25</span> } <span class="type"><a href="qml-qtquick-canvas.html">Canvas</a></span> { <span class="name">id</span>: <span class="name">canvas</span> <span class="name">width</span>: <span class="number">320</span> <span class="name">height</span>: <span class="number">250</span> <span class="name">antialiasing</span>: <span class="number">true</span> property <span class="type">color</span> <span class="name">strokeStyle</span>: <span class="name">Qt</span>.<span class="name">darker</span>(<span class="name">fillStyle</span>, <span class="number">1.2</span>) property <span class="type">color</span> <span class="name">fillStyle</span>: <span class="string">"#6400aa"</span> property <span class="type">int</span> <span class="name">lineWidth</span>: <span class="number">2</span> property <span class="type">int</span> <span class="name">nSize</span>: <span class="name">nCtrl</span>.<span class="name">value</span> property <span class="type">real</span> <span class="name">radius</span>: <span class="name">rCtrl</span>.<span class="name">value</span> property <span class="type">bool</span> <span class="name">fill</span>: <span class="number">true</span> property <span class="type">bool</span> <span class="name">stroke</span>: <span class="number">false</span> property <span class="type">real</span> <span class="name">px</span>: <span class="name">width</span><span class="operator">/</span><span class="number">2</span> property <span class="type">real</span> <span class="name">py</span>: <span class="name">height</span><span class="operator">/</span><span class="number">2</span> <span class="operator">+</span> <span class="number">10</span> property <span class="type">real</span> <span class="name">alpha</span>: <span class="number">1.0</span> <span class="name">onRadiusChanged</span>: <span class="name">requestPaint</span>(); <span class="name">onLineWidthChanged</span>: <span class="name">requestPaint</span>(); <span class="name">onNSizeChanged</span>: <span class="name">requestPaint</span>(); <span class="name">onFillChanged</span>: <span class="name">requestPaint</span>(); <span class="name">onStrokeChanged</span>: <span class="name">requestPaint</span>(); <span class="name">onPaint</span>: <span class="name">squircle</span>(); <span class="keyword">function</span> <span class="name">squircle</span>() { var <span class="name">ctx</span> = <span class="name">canvas</span>.<span class="name">getContext</span>(<span class="string">"2d"</span>); var <span class="name">N</span> = <span class="name">canvas</span>.<span class="name">nSize</span>; var <span class="name">R</span> = <span class="name">canvas</span>.<span class="name">radius</span>; <span class="name">N</span><span class="operator">=</span><span class="name">Math</span>.<span class="name">abs</span>(<span class="name">N</span>); var <span class="name">M</span>=<span class="name">N</span>; <span class="keyword">if</span> (<span class="name">N</span><span class="operator">></span><span class="number">100</span>) <span class="name">M</span><span class="operator">=</span><span class="number">100</span>; <span class="keyword">if</span> (<span class="name">N</span><span class="operator"><</span><span class="number">0.00000000001</span>) <span class="name">M</span><span class="operator">=</span><span class="number">0.00000000001</span>; <span class="name">ctx</span>.<span class="name">save</span>(); <span class="name">ctx</span>.<span class="name">globalAlpha</span> <span class="operator">=</span><span class="name">canvas</span>.<span class="name">alpha</span>; <span class="name">ctx</span>.<span class="name">fillStyle</span> <span class="operator">=</span> <span class="string">"white"</span>; <span class="name">ctx</span>.<span class="name">fillRect</span>(<span class="number">0</span>, <span class="number">0</span>, <span class="name">canvas</span>.<span class="name">width</span>, <span class="name">canvas</span>.<span class="name">height</span>); <span class="name">ctx</span>.<span class="name">strokeStyle</span> <span class="operator">=</span> <span class="name">canvas</span>.<span class="name">strokeStyle</span>; <span class="name">ctx</span>.<span class="name">fillStyle</span> <span class="operator">=</span> <span class="name">canvas</span>.<span class="name">fillStyle</span>; <span class="name">ctx</span>.<span class="name">lineWidth</span> <span class="operator">=</span> <span class="name">canvas</span>.<span class="name">lineWidth</span>; <span class="name">ctx</span>.<span class="name">beginPath</span>(); var <span class="name">i</span> = <span class="number">0</span>, <span class="name">x</span>, <span class="name">y</span>; <span class="keyword">for</span> (<span class="name">i</span><span class="operator">=</span><span class="number">0</span>; <span class="name">i</span><span class="operator"><</span>(<span class="number">2</span><span class="operator">*</span><span class="name">R</span><span class="operator">+</span><span class="number">1</span>); i++){ <span class="name">x</span> <span class="operator">=</span> <span class="name">Math</span>.<span class="name">round</span>(<span class="name">i</span><span class="operator">-</span><span class="name">R</span>) <span class="operator">+</span> <span class="name">canvas</span>.<span class="name">px</span>; <span class="name">y</span> <span class="operator">=</span> <span class="name">Math</span>.<span class="name">round</span>(<span class="name">Math</span>.<span class="name">pow</span>(<span class="name">Math</span>.<span class="name">abs</span>(<span class="name">Math</span>.<span class="name">pow</span>(<span class="name">R</span>,<span class="name">M</span>)<span class="operator">-</span><span class="name">Math</span>.<span class="name">pow</span>(<span class="name">Math</span>.<span class="name">abs</span>(<span class="name">i</span><span class="operator">-</span><span class="name">R</span>),<span class="name">M</span>)),<span class="number">1</span><span class="operator">/</span><span class="name">M</span>)) <span class="operator">+</span> <span class="name">canvas</span>.<span class="name">py</span>; <span class="keyword">if</span> (<span class="name">i</span> <span class="operator">==</span> <span class="number">0</span>) <span class="name">ctx</span>.<span class="name">moveTo</span>(<span class="name">x</span>, <span class="name">y</span>); <span class="keyword">else</span> <span class="name">ctx</span>.<span class="name">lineTo</span>(<span class="name">x</span>, <span class="name">y</span>); } <span class="keyword">for</span> (<span class="name">i</span><span class="operator">=</span>(<span class="number">2</span><span class="operator">*</span><span class="name">R</span>); <span class="name">i</span><span class="operator"><</span>(<span class="number">4</span><span class="operator">*</span><span class="name">R</span><span class="operator">+</span><span class="number">1</span>); i++){ <span class="name">x</span> <span class="operator">=</span><span class="name">Math</span>.<span class="name">round</span>(<span class="number">3</span><span class="operator">*</span><span class="name">R</span><span class="operator">-</span><span class="name">i</span>)<span class="operator">+</span><span class="name">canvas</span>.<span class="name">px</span>; <span class="name">y</span> <span class="operator">=</span> <span class="name">Math</span>.<span class="name">round</span>(-<span class="name">Math</span>.<span class="name">pow</span>(<span class="name">Math</span>.<span class="name">abs</span>(<span class="name">Math</span>.<span class="name">pow</span>(<span class="name">R</span>,<span class="name">M</span>)<span class="operator">-</span><span class="name">Math</span>.<span class="name">pow</span>(<span class="name">Math</span>.<span class="name">abs</span>(<span class="number">3</span><span class="operator">*</span><span class="name">R</span><span class="operator">-</span><span class="name">i</span>),<span class="name">M</span>)),<span class="number">1</span><span class="operator">/</span><span class="name">M</span>)) <span class="operator">+</span> <span class="name">canvas</span>.<span class="name">py</span>; <span class="name">ctx</span>.<span class="name">lineTo</span>(<span class="name">x</span>, <span class="name">y</span>); } <span class="name">ctx</span>.<span class="name">closePath</span>(); <span class="keyword">if</span> (<span class="name">canvas</span>.<span class="name">stroke</span>) { <span class="name">ctx</span>.<span class="name">stroke</span>(); } <span class="keyword">if</span> (<span class="name">canvas</span>.<span class="name">fill</span>) { <span class="name">ctx</span>.<span class="name">fill</span>(); } <span class="name">ctx</span>.<span class="name">restore</span>(); } } } <span class="type"><a href="qml-qtquick-column.html">Column</a></span> { <span class="name">anchors</span>.bottom: <span class="name">parent</span>.<span class="name">bottom</span> <span class="name">anchors</span>.bottomMargin: <span class="number">12</span> <span class="type">Slider</span> {<span class="name">id</span>: <span class="name">nCtrl</span> ; <span class="name">min</span>: <span class="number">1</span> ; <span class="name">max</span>: <span class="number">10</span> ; <span class="name">init</span>: <span class="number">2</span> ; <span class="name">name</span>: <span class="string">"N"</span>} <span class="type">Slider</span> {<span class="name">id</span>: <span class="name">rCtrl</span> ; <span class="name">min</span>: <span class="number">30</span> ; <span class="name">max</span>: <span class="number">180</span> ; <span class="name">init</span>: <span class="number">60</span> ; <span class="name">name</span>: <span class="string">"Radius"</span>} } } </pre> </div> <!-- @@@canvas/squircle/squircle.qml --> </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>