<?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>linenode.cpp 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-scenegraph-graph-example.html">Scene Graph - Graph</a></td><td >linenode.cpp 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">linenode.cpp Example File</h1> <span class="subtitle">scenegraph/graph/linenode.cpp</span> <!-- $$$scenegraph/graph/linenode.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <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> <span class="preprocessor">#include "linenode.h"</span> <span class="preprocessor">#include <QtGui/QColor></span> <span class="preprocessor">#include <QtQuick/QSGSimpleMaterial></span> <span class="keyword">struct</span> LineMaterial { <span class="type">QColor</span> color; <span class="type">float</span> spread; <span class="type">float</span> size; }; <span class="keyword">class</span> LineShader : <span class="keyword">public</span> <span class="type"><a href="qsgsimplematerialshader.html">QSGSimpleMaterialShader</a></span><span class="operator"><</span>LineMaterial<span class="operator">></span> { QSG_DECLARE_SIMPLE_SHADER(LineShader<span class="operator">,</span> LineMaterial) <span class="keyword">public</span>: LineShader() : id_color(<span class="operator">-</span><span class="number">1</span>)<span class="operator">,</span> id_spread(<span class="operator">-</span><span class="number">1</span>)<span class="operator">,</span> id_size(<span class="operator">-</span><span class="number">1</span>) { setShaderSourceFile(<span class="type">QOpenGLShader</span><span class="operator">::</span>Vertex<span class="operator">,</span> <span class="string">":/scenegraph/graph/shaders/line.vsh"</span>); setShaderSourceFile(<span class="type">QOpenGLShader</span><span class="operator">::</span>Fragment<span class="operator">,</span> <span class="string">":/scenegraph/graph/shaders/line.fsh"</span>); } <span class="type">QList</span><span class="operator"><</span><span class="type">QByteArray</span><span class="operator">></span> attributes() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type">QList</span><span class="operator"><</span><span class="type">QByteArray</span><span class="operator">></span>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"pos"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"t"</span>; } <span class="type">void</span> updateState(<span class="keyword">const</span> LineMaterial <span class="operator">*</span>m<span class="operator">,</span> <span class="keyword">const</span> LineMaterial <span class="operator">*</span>) { program()<span class="operator">-</span><span class="operator">></span>setUniformValue(id_color<span class="operator">,</span> m<span class="operator">-</span><span class="operator">></span>color); program()<span class="operator">-</span><span class="operator">></span>setUniformValue(id_spread<span class="operator">,</span> m<span class="operator">-</span><span class="operator">></span>spread); program()<span class="operator">-</span><span class="operator">></span>setUniformValue(id_size<span class="operator">,</span> m<span class="operator">-</span><span class="operator">></span>size); } <span class="type">void</span> resolveUniforms() { id_spread <span class="operator">=</span> program()<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"spread"</span>); id_size <span class="operator">=</span> program()<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"size"</span>); id_color <span class="operator">=</span> program()<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"color"</span>); } <span class="keyword">private</span>: <span class="type">int</span> id_color; <span class="type">int</span> id_spread; <span class="type">int</span> id_size; }; <span class="keyword">struct</span> LineVertex { <span class="type">float</span> x; <span class="type">float</span> y; <span class="type">float</span> t; <span class="keyword">inline</span> <span class="type">void</span> set(<span class="type">float</span> xx<span class="operator">,</span> <span class="type">float</span> yy<span class="operator">,</span> <span class="type">float</span> tt) { x <span class="operator">=</span> xx; y <span class="operator">=</span> yy; t <span class="operator">=</span> tt; } }; <span class="keyword">static</span> <span class="keyword">const</span> <span class="type"><a href="qsggeometry.html">QSGGeometry</a></span><span class="operator">::</span>AttributeSet <span class="operator">&</span>attributes() { <span class="keyword">static</span> <span class="type"><a href="qsggeometry.html">QSGGeometry</a></span><span class="operator">::</span>Attribute attr<span class="operator">[</span><span class="operator">]</span> <span class="operator">=</span> { <span class="type"><a href="qsggeometry.html">QSGGeometry</a></span><span class="operator">::</span>Attribute<span class="operator">::</span>create(<span class="number">0</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> GL_FLOAT<span class="operator">,</span> <span class="keyword">true</span>)<span class="operator">,</span> <span class="type"><a href="qsggeometry.html">QSGGeometry</a></span><span class="operator">::</span>Attribute<span class="operator">::</span>create(<span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> GL_FLOAT) }; <span class="keyword">static</span> <span class="type"><a href="qsggeometry.html">QSGGeometry</a></span><span class="operator">::</span>AttributeSet set <span class="operator">=</span> { <span class="number">2</span><span class="operator">,</span> <span class="number">3</span> <span class="operator">*</span> <span class="keyword">sizeof</span>(<span class="type">float</span>)<span class="operator">,</span> attr }; <span class="keyword">return</span> set; } LineNode<span class="operator">::</span>LineNode(<span class="type">float</span> size<span class="operator">,</span> <span class="type">float</span> spread<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QColor</span> <span class="operator">&</span>color) : m_geometry(attributes()<span class="operator">,</span> <span class="number">0</span>) { setGeometry(<span class="operator">&</span>m_geometry); m_geometry<span class="operator">.</span>setDrawingMode(GL_TRIANGLE_STRIP); <span class="type"><a href="qsgsimplematerial.html">QSGSimpleMaterial</a></span><span class="operator"><</span>LineMaterial<span class="operator">></span> <span class="operator">*</span>m <span class="operator">=</span> LineShader<span class="operator">::</span>createMaterial(); m<span class="operator">-</span><span class="operator">></span>state()<span class="operator">-</span><span class="operator">></span>color <span class="operator">=</span> color; m<span class="operator">-</span><span class="operator">></span>state()<span class="operator">-</span><span class="operator">></span>size <span class="operator">=</span> size; m<span class="operator">-</span><span class="operator">></span>state()<span class="operator">-</span><span class="operator">></span>spread <span class="operator">=</span> spread; m<span class="operator">-</span><span class="operator">></span>setFlag(<span class="type"><a href="qsgmaterial.html">QSGMaterial</a></span><span class="operator">::</span>Blending); setMaterial(m); setFlag(OwnsMaterial); } <span class="comment">/* * Assumes that samples have values in the range of 0 to 1 and scales them to * the height of bounds. The samples are stretched out horizontally along the * width of the bounds. * * The position of each pair of points is identical, but we use the third value * "t" to shift the point up or down and to add antialiasing. */</span> <span class="type">void</span> LineNode<span class="operator">::</span>updateGeometry(<span class="keyword">const</span> <span class="type">QRectF</span> <span class="operator">&</span>bounds<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QList</span><span class="operator"><</span><span class="type">qreal</span><span class="operator">></span> <span class="operator">&</span>samples) { m_geometry<span class="operator">.</span>allocate(samples<span class="operator">.</span>size() <span class="operator">*</span> <span class="number">2</span>); <span class="type">float</span> x <span class="operator">=</span> bounds<span class="operator">.</span>x(); <span class="type">float</span> y <span class="operator">=</span> bounds<span class="operator">.</span>y(); <span class="type">float</span> w <span class="operator">=</span> bounds<span class="operator">.</span>width(); <span class="type">float</span> h <span class="operator">=</span> bounds<span class="operator">.</span>height(); <span class="type">float</span> dx <span class="operator">=</span> w <span class="operator">/</span> (samples<span class="operator">.</span>size() <span class="operator">-</span> <span class="number">1</span>); LineVertex <span class="operator">*</span>v <span class="operator">=</span> (LineVertex <span class="operator">*</span>) m_geometry<span class="operator">.</span>vertexData(); <span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="number">0</span>; i<span class="operator"><</span>samples<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) { v<span class="operator">[</span>i<span class="operator">*</span><span class="number">2</span><span class="operator">+</span><span class="number">0</span><span class="operator">]</span><span class="operator">.</span>set(x <span class="operator">+</span> dx <span class="operator">*</span> i<span class="operator">,</span> y <span class="operator">+</span> samples<span class="operator">.</span>at(i) <span class="operator">*</span> h<span class="operator">,</span> <span class="number">0</span>); v<span class="operator">[</span>i<span class="operator">*</span><span class="number">2</span><span class="operator">+</span><span class="number">1</span><span class="operator">]</span><span class="operator">.</span>set(x <span class="operator">+</span> dx <span class="operator">*</span> i<span class="operator">,</span> y <span class="operator">+</span> samples<span class="operator">.</span>at(i) <span class="operator">*</span> h<span class="operator">,</span> <span class="number">1</span>); } markDirty(<span class="type"><a href="qsgnode.html">QSGNode</a></span><span class="operator">::</span>DirtyGeometry); } </pre> </div> <!-- @@@scenegraph/graph/linenode.cpp --> </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>