<?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>rainfallgraph.cpp Example File | Qt Data Visualization 5.12.2</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 5.12</td><td ><a href="qtdatavisualization-index.html">Qt Data Visualization</a></td><td ><a href="qtdatavisualization-customproxy-example.html">Custom Proxy Example</a></td><td >rainfallgraph.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtdatavisualization-index.html">Qt Data Visualization | Commercial or GPLv3</a></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">rainfallgraph.cpp Example File</h1> <span class="subtitle">customproxy/rainfallgraph.cpp</span> <!-- $$$customproxy/rainfallgraph.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the Qt Data Visualization module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:GPL$ ** 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. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3 or (at your option) any later version ** approved by the KDE Free Qt Foundation. The licenses are as published by ** the Free Software Foundation and appearing in the file LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "rainfallgraph.h"</span> <span class="preprocessor">#include <QtDataVisualization/qcategory3daxis.h></span> <span class="preprocessor">#include <QtDataVisualization/qvalue3daxis.h></span> <span class="preprocessor">#include <QtDataVisualization/q3dscene.h></span> <span class="preprocessor">#include <QtDataVisualization/q3dcamera.h></span> <span class="preprocessor">#include <QtDataVisualization/qbar3dseries.h></span> <span class="preprocessor">#include <QtDataVisualization/q3dtheme.h></span> <span class="preprocessor">#include <QtGui/QGuiApplication></span> <span class="preprocessor">#include <QtGui/QFont></span> <span class="preprocessor">#include <QtCore/QDebug></span> <span class="preprocessor">#include <QtCore/QTextStream></span> <span class="preprocessor">#include <QtCore/QFile></span> <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="type">QtDataVisualization</span>; RainfallGraph<span class="operator">::</span>RainfallGraph(<span class="type"><a href="q3dbars.html">Q3DBars</a></span> <span class="operator">*</span>rainfall) : m_graph(rainfall) { <span class="comment">// In data file the months are in numeric format, so create custom list</span> <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator"><</span><span class="operator">=</span> <span class="number">12</span>; i<span class="operator">+</span><span class="operator">+</span>) m_numericMonths <span class="operator"><</span><span class="operator"><</span> <span class="type">QString</span><span class="operator">::</span>number(i); m_columnCount <span class="operator">=</span> m_numericMonths<span class="operator">.</span>size(); m_proxy <span class="operator">=</span> <span class="keyword">new</span> VariantBarDataProxy; QBar3DSeries <span class="operator">*</span>series <span class="operator">=</span> <span class="keyword">new</span> QBar3DSeries(m_proxy); m_graph<span class="operator">-</span><span class="operator">></span>addSeries(series); updateYearsList(<span class="number">2000</span><span class="operator">,</span> <span class="number">2012</span>); <span class="comment">// Set up bar specifications; make the bars as wide as they are deep,</span> <span class="comment">// and add a small space between the bars</span> m_graph<span class="operator">-</span><span class="operator">></span>setBarThickness(<span class="number">1.0f</span>); m_graph<span class="operator">-</span><span class="operator">></span>setBarSpacing(<span class="type">QSizeF</span>(<span class="number">1.1</span><span class="operator">,</span> <span class="number">1.1</span>)); <span class="comment">// Set axis labels and titles</span> <span class="type">QStringList</span> months; months <span class="operator"><</span><span class="operator"><</span> <span class="string">"January"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"February"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"March"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"April"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"May"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"June"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"July"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"August"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"September"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"October"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"November"</span> <span class="operator"><</span><span class="operator"><</span> <span class="string">"December"</span>; m_graph<span class="operator">-</span><span class="operator">></span>rowAxis()<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Year"</span>); m_graph<span class="operator">-</span><span class="operator">></span>columnAxis()<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Month"</span>); m_graph<span class="operator">-</span><span class="operator">></span>valueAxis()<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"rainfall"</span>); m_graph<span class="operator">-</span><span class="operator">></span>valueAxis()<span class="operator">-</span><span class="operator">></span>setLabelFormat(<span class="string">"%d mm"</span>); m_graph<span class="operator">-</span><span class="operator">></span>valueAxis()<span class="operator">-</span><span class="operator">></span>setSegmentCount(<span class="number">5</span>); m_graph<span class="operator">-</span><span class="operator">></span>rowAxis()<span class="operator">-</span><span class="operator">></span>setLabels(m_years); m_graph<span class="operator">-</span><span class="operator">></span>columnAxis()<span class="operator">-</span><span class="operator">></span>setLabels(months); <span class="comment">// Set bar type to cylinder</span> series<span class="operator">-</span><span class="operator">></span>setMesh(QAbstract3DSeries<span class="operator">::</span>MeshCylinder); <span class="comment">// Set shadows to medium</span> m_graph<span class="operator">-</span><span class="operator">></span>setShadowQuality(QAbstract3DGraph<span class="operator">::</span>ShadowQualityMedium); <span class="comment">// Set selection mode to bar and column</span> m_graph<span class="operator">-</span><span class="operator">></span>setSelectionMode(QAbstract3DGraph<span class="operator">::</span>SelectionItemAndColumn <span class="operator">|</span> QAbstract3DGraph<span class="operator">::</span>SelectionSlice); <span class="comment">// Set theme</span> m_graph<span class="operator">-</span><span class="operator">></span>activeTheme()<span class="operator">-</span><span class="operator">></span>setType(<span class="type"><a href="q3dtheme.html">Q3DTheme</a></span><span class="operator">::</span>ThemeArmyBlue); <span class="comment">// Override font in theme</span> m_graph<span class="operator">-</span><span class="operator">></span>activeTheme()<span class="operator">-</span><span class="operator">></span>setFont(<span class="type">QFont</span>(<span class="string">"Century Gothic"</span><span class="operator">,</span> <span class="number">30</span>)); <span class="comment">// Override label background for theme</span> m_graph<span class="operator">-</span><span class="operator">></span>activeTheme()<span class="operator">-</span><span class="operator">></span>setLabelBackgroundEnabled(<span class="keyword">false</span>); <span class="comment">// Set camera position and zoom</span> m_graph<span class="operator">-</span><span class="operator">></span>scene()<span class="operator">-</span><span class="operator">></span>activeCamera()<span class="operator">-</span><span class="operator">></span>setCameraPreset(<span class="type"><a href="q3dcamera.html">Q3DCamera</a></span><span class="operator">::</span>CameraPresetIsometricRightHigh); <span class="comment">// Set window title</span> m_graph<span class="operator">-</span><span class="operator">></span>setTitle(<span class="type">QStringLiteral</span>(<span class="string">"Monthly rainfall in Northern Finland"</span>)); <span class="comment">// Set reflections on</span> m_graph<span class="operator">-</span><span class="operator">></span>setReflection(<span class="keyword">true</span>); } RainfallGraph<span class="operator">::</span><span class="operator">~</span>RainfallGraph() { <span class="keyword">delete</span> m_mapping; <span class="keyword">delete</span> m_dataSet; <span class="keyword">delete</span> m_graph; } <span class="type">void</span> RainfallGraph<span class="operator">::</span>start() { addDataSet(); } <span class="type">void</span> RainfallGraph<span class="operator">::</span>updateYearsList(<span class="type">int</span> start<span class="operator">,</span> <span class="type">int</span> end) { m_years<span class="operator">.</span>clear(); <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> start; i <span class="operator"><</span><span class="operator">=</span> end; i<span class="operator">+</span><span class="operator">+</span>) m_years <span class="operator"><</span><span class="operator"><</span> <span class="type">QString</span><span class="operator">::</span>number(i); m_rowCount <span class="operator">=</span> m_years<span class="operator">.</span>size(); } <span class="type">void</span> RainfallGraph<span class="operator">::</span>addDataSet() { <span class="comment">// Create a new variant data set and data item list</span> m_dataSet <span class="operator">=</span> <span class="keyword">new</span> VariantDataSet; VariantDataItemList <span class="operator">*</span>itemList <span class="operator">=</span> <span class="keyword">new</span> VariantDataItemList; <span class="comment">// Read data from a data file into the data item list</span> <span class="type">QTextStream</span> stream; <span class="type">QFile</span> dataFile(<span class="string">":/data/raindata.txt"</span>); <span class="keyword">if</span> (dataFile<span class="operator">.</span>open(<span class="type">QIODevice</span><span class="operator">::</span>ReadOnly <span class="operator">|</span> <span class="type">QIODevice</span><span class="operator">::</span>Text)) { stream<span class="operator">.</span>setDevice(<span class="operator">&</span>dataFile); <span class="keyword">while</span> (<span class="operator">!</span>stream<span class="operator">.</span>atEnd()) { <span class="type">QString</span> line <span class="operator">=</span> stream<span class="operator">.</span>readLine(); <span class="keyword">if</span> (line<span class="operator">.</span>startsWith(<span class="string">"#"</span>)) <span class="comment">// Ignore comments</span> <span class="keyword">continue</span>; <span class="type">QStringList</span> strList <span class="operator">=</span> line<span class="operator">.</span>split(<span class="string">","</span><span class="operator">,</span> <span class="type">QString</span><span class="operator">::</span>SkipEmptyParts); <span class="comment">// Each line has three data items: Year, month, and rainfall value</span> <span class="keyword">if</span> (strList<span class="operator">.</span>size() <span class="operator"><</span> <span class="number">3</span>) { qWarning() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Invalid row read from data:"</span> <span class="operator"><</span><span class="operator"><</span> line; <span class="keyword">continue</span>; } <span class="comment">// Store year and month as strings, and rainfall value as double</span> <span class="comment">// into a variant data item and add the item to the item list.</span> VariantDataItem <span class="operator">*</span>newItem <span class="operator">=</span> <span class="keyword">new</span> VariantDataItem; <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> <span class="number">2</span>; i<span class="operator">+</span><span class="operator">+</span>) newItem<span class="operator">-</span><span class="operator">></span>append(strList<span class="operator">.</span>at(i)<span class="operator">.</span>trimmed()); newItem<span class="operator">-</span><span class="operator">></span>append(strList<span class="operator">.</span>at(<span class="number">2</span>)<span class="operator">.</span>trimmed()<span class="operator">.</span>toDouble()); itemList<span class="operator">-</span><span class="operator">></span>append(newItem); } } <span class="keyword">else</span> { qWarning() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Unable to open data file:"</span> <span class="operator"><</span><span class="operator"><</span> dataFile<span class="operator">.</span>fileName(); } <span class="comment">// Add items to the data set and set it to the proxy</span> m_dataSet<span class="operator">-</span><span class="operator">></span>addItems(itemList); m_proxy<span class="operator">-</span><span class="operator">></span>setDataSet(m_dataSet); <span class="comment">// Create new mapping for the data and set it to the proxy</span> m_mapping <span class="operator">=</span> <span class="keyword">new</span> VariantBarDataMapping(<span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> m_years<span class="operator">,</span> m_numericMonths); m_proxy<span class="operator">-</span><span class="operator">></span>setMapping(m_mapping); } </pre> </div> <!-- @@@customproxy/rainfallgraph.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 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>