<?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>chart.cpp Example File | Qt Charts 5.11</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 ><a href="../qtdoc/index.html">Qt 5.11</a></td><td ><a href="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-zoomlinechart-example.html">Zoom Line Example</a></td><td >chart.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.11.2 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">chart.cpp Example File</h1> <span class="subtitle">zoomlinechart/chart.cpp</span> <!-- $$$zoomlinechart/chart.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 Charts 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 "chart.h"</span> <span class="preprocessor">#include <QtWidgets/QGesture></span> <span class="preprocessor">#include <QtWidgets/QGraphicsScene></span> <span class="preprocessor">#include <QtWidgets/QGraphicsView></span> Chart<span class="operator">::</span>Chart(<span class="type"><a href="../qtwidgets/qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>parent<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WindowFlags wFlags) : <span class="type"><a href="qchart.html">QChart</a></span>(<span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>ChartTypeCartesian<span class="operator">,</span> parent<span class="operator">,</span> wFlags) { <span class="comment">// Seems that QGraphicsView (QChartView) does not grab gestures.</span> <span class="comment">// They can only be grabbed here in the QGraphicsWidget (QChart).</span> grabGesture(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>PanGesture); grabGesture(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>PinchGesture); } Chart<span class="operator">::</span><span class="operator">~</span>Chart() { } bool Chart<span class="operator">::</span>sceneEvent(<span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>Gesture) <span class="keyword">return</span> gestureEvent(<span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtwidgets/qgestureevent.html">QGestureEvent</a></span> <span class="operator">*</span><span class="operator">></span>(event)); <span class="keyword">return</span> <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>event(event); } bool Chart<span class="operator">::</span>gestureEvent(<span class="type"><a href="../qtwidgets/qgestureevent.html">QGestureEvent</a></span> <span class="operator">*</span>event) { <span class="keyword">if</span> (<span class="type"><a href="../qtwidgets/qgesture.html">QGesture</a></span> <span class="operator">*</span>gesture <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>gesture(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>PanGesture)) { <span class="type"><a href="../qtwidgets/qpangesture.html">QPanGesture</a></span> <span class="operator">*</span>pan <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtwidgets/qpangesture.html">QPanGesture</a></span> <span class="operator">*</span><span class="operator">></span>(gesture); <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>scroll(<span class="operator">-</span>(pan<span class="operator">-</span><span class="operator">></span>delta()<span class="operator">.</span>x())<span class="operator">,</span> pan<span class="operator">-</span><span class="operator">></span>delta()<span class="operator">.</span>y()); } <span class="keyword">if</span> (<span class="type"><a href="../qtwidgets/qgesture.html">QGesture</a></span> <span class="operator">*</span>gesture <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>gesture(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>PinchGesture)) { <span class="type"><a href="../qtwidgets/qpinchgesture.html">QPinchGesture</a></span> <span class="operator">*</span>pinch <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtwidgets/qpinchgesture.html">QPinchGesture</a></span> <span class="operator">*</span><span class="operator">></span>(gesture); <span class="keyword">if</span> (pinch<span class="operator">-</span><span class="operator">></span>changeFlags() <span class="operator">&</span> <span class="type"><a href="../qtwidgets/qpinchgesture.html">QPinchGesture</a></span><span class="operator">::</span>ScaleFactorChanged) <span class="type"><a href="qchart.html">QChart</a></span><span class="operator">::</span>zoom(pinch<span class="operator">-</span><span class="operator">></span>scaleFactor()); } <span class="keyword">return</span> <span class="keyword">true</span>; } </pre> </div> <!-- @@@zoomlinechart/chart.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2018 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>