<?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>view.cpp Example File | Qt Charts 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="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-callout-example.html">Callout Example</a></td><td >view.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">view.cpp Example File</h1> <span class="subtitle">callout/view.cpp</span> <!-- $$$callout/view.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 "view.h"</span> <span class="preprocessor">#include <QtGui/QResizeEvent></span> <span class="preprocessor">#include <QtWidgets/QGraphicsScene></span> <span class="preprocessor">#include <QtCharts/QChart></span> <span class="preprocessor">#include <QtCharts/QLineSeries></span> <span class="preprocessor">#include <QtCharts/QSplineSeries></span> <span class="preprocessor">#include <QtWidgets/QGraphicsTextItem></span> <span class="preprocessor">#include "callout.h"</span> <span class="preprocessor">#include <QtGui/QMouseEvent></span> View<span class="operator">::</span>View(<span class="type">QWidget</span> <span class="operator">*</span>parent) : <span class="type">QGraphicsView</span>(<span class="keyword">new</span> <span class="type">QGraphicsScene</span><span class="operator">,</span> parent)<span class="operator">,</span> m_coordX(<span class="number">0</span>)<span class="operator">,</span> m_coordY(<span class="number">0</span>)<span class="operator">,</span> m_chart(<span class="number">0</span>)<span class="operator">,</span> m_tooltip(<span class="number">0</span>) { setDragMode(<span class="type">QGraphicsView</span><span class="operator">::</span>NoDrag); setVerticalScrollBarPolicy(<span class="type">Qt</span><span class="operator">::</span>ScrollBarAlwaysOff); setHorizontalScrollBarPolicy(<span class="type">Qt</span><span class="operator">::</span>ScrollBarAlwaysOff); <span class="comment">// chart</span> m_chart <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>; m_chart<span class="operator">-</span><span class="operator">></span>setMinimumSize(<span class="number">640</span><span class="operator">,</span> <span class="number">480</span>); m_chart<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Hover the line to show callout. Click the line to make it stay"</span>); m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>hide(); <span class="type"><a href="qlineseries.html">QLineSeries</a></span> <span class="operator">*</span>series <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineseries.html">QLineSeries</a></span>; series<span class="operator">-</span><span class="operator">></span>append(<span class="number">1</span><span class="operator">,</span> <span class="number">3</span>); series<span class="operator">-</span><span class="operator">></span>append(<span class="number">4</span><span class="operator">,</span> <span class="number">5</span>); series<span class="operator">-</span><span class="operator">></span>append(<span class="number">5</span><span class="operator">,</span> <span class="number">4.5</span>); series<span class="operator">-</span><span class="operator">></span>append(<span class="number">7</span><span class="operator">,</span> <span class="number">1</span>); series<span class="operator">-</span><span class="operator">></span>append(<span class="number">11</span><span class="operator">,</span> <span class="number">2</span>); m_chart<span class="operator">-</span><span class="operator">></span>addSeries(series); <span class="type"><a href="qsplineseries.html">QSplineSeries</a></span> <span class="operator">*</span>series2 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsplineseries.html">QSplineSeries</a></span>; series2<span class="operator">-</span><span class="operator">></span>append(<span class="number">1.6</span><span class="operator">,</span> <span class="number">1.4</span>); series2<span class="operator">-</span><span class="operator">></span>append(<span class="number">2.4</span><span class="operator">,</span> <span class="number">3.5</span>); series2<span class="operator">-</span><span class="operator">></span>append(<span class="number">3.7</span><span class="operator">,</span> <span class="number">2.5</span>); series2<span class="operator">-</span><span class="operator">></span>append(<span class="number">7</span><span class="operator">,</span> <span class="number">4</span>); series2<span class="operator">-</span><span class="operator">></span>append(<span class="number">10</span><span class="operator">,</span> <span class="number">2</span>); m_chart<span class="operator">-</span><span class="operator">></span>addSeries(series2); m_chart<span class="operator">-</span><span class="operator">></span>createDefaultAxes(); m_chart<span class="operator">-</span><span class="operator">></span>setAcceptHoverEvents(<span class="keyword">true</span>); setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing); scene()<span class="operator">-</span><span class="operator">></span>addItem(m_chart); m_coordX <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGraphicsSimpleTextItem</span>(m_chart); m_coordX<span class="operator">-</span><span class="operator">></span>setPos(m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span> <span class="operator">-</span> <span class="number">50</span><span class="operator">,</span> m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>height()); m_coordX<span class="operator">-</span><span class="operator">></span>setText(<span class="string">"X: "</span>); m_coordY <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGraphicsSimpleTextItem</span>(m_chart); m_coordY<span class="operator">-</span><span class="operator">></span>setPos(m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span> <span class="operator">+</span> <span class="number">50</span><span class="operator">,</span> m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>height()); m_coordY<span class="operator">-</span><span class="operator">></span>setText(<span class="string">"Y: "</span>); connect(series<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qlineseries.html">QLineSeries</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>View<span class="operator">::</span>keepCallout); connect(series<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qlineseries.html">QLineSeries</a></span><span class="operator">::</span>hovered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>View<span class="operator">::</span>tooltip); connect(series2<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qsplineseries.html">QSplineSeries</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>View<span class="operator">::</span>keepCallout); connect(series2<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qsplineseries.html">QSplineSeries</a></span><span class="operator">::</span>hovered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>View<span class="operator">::</span>tooltip); <span class="keyword">this</span><span class="operator">-</span><span class="operator">></span>setMouseTracking(<span class="keyword">true</span>); } <span class="type">void</span> View<span class="operator">::</span>resizeEvent(<span class="type">QResizeEvent</span> <span class="operator">*</span>event) { <span class="keyword">if</span> (scene()) { scene()<span class="operator">-</span><span class="operator">></span>setSceneRect(<span class="type">QRect</span>(<span class="type">QPoint</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>)<span class="operator">,</span> event<span class="operator">-</span><span class="operator">></span>size())); m_chart<span class="operator">-</span><span class="operator">></span>resize(event<span class="operator">-</span><span class="operator">></span>size()); m_coordX<span class="operator">-</span><span class="operator">></span>setPos(m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span> <span class="operator">-</span> <span class="number">50</span><span class="operator">,</span> m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>height() <span class="operator">-</span> <span class="number">20</span>); m_coordY<span class="operator">-</span><span class="operator">></span>setPos(m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span> <span class="operator">+</span> <span class="number">50</span><span class="operator">,</span> m_chart<span class="operator">-</span><span class="operator">></span>size()<span class="operator">.</span>height() <span class="operator">-</span> <span class="number">20</span>); <span class="keyword">const</span> <span class="keyword">auto</span> callouts <span class="operator">=</span> m_callouts; <span class="keyword">for</span> (Callout <span class="operator">*</span>callout : callouts) callout<span class="operator">-</span><span class="operator">></span>updateGeometry(); } <span class="type">QGraphicsView</span><span class="operator">::</span>resizeEvent(event); } <span class="type">void</span> View<span class="operator">::</span>mouseMoveEvent(<span class="type">QMouseEvent</span> <span class="operator">*</span>event) { m_coordX<span class="operator">-</span><span class="operator">></span>setText(<span class="type">QString</span>(<span class="string">"X: %1"</span>)<span class="operator">.</span>arg(m_chart<span class="operator">-</span><span class="operator">></span>mapToValue(event<span class="operator">-</span><span class="operator">></span>pos())<span class="operator">.</span>x())); m_coordY<span class="operator">-</span><span class="operator">></span>setText(<span class="type">QString</span>(<span class="string">"Y: %1"</span>)<span class="operator">.</span>arg(m_chart<span class="operator">-</span><span class="operator">></span>mapToValue(event<span class="operator">-</span><span class="operator">></span>pos())<span class="operator">.</span>y())); <span class="type">QGraphicsView</span><span class="operator">::</span>mouseMoveEvent(event); } <span class="type">void</span> View<span class="operator">::</span>keepCallout() { m_callouts<span class="operator">.</span>append(m_tooltip); m_tooltip <span class="operator">=</span> <span class="keyword">new</span> Callout(m_chart); } <span class="type">void</span> View<span class="operator">::</span>tooltip(<span class="type">QPointF</span> point<span class="operator">,</span> bool state) { <span class="keyword">if</span> (m_tooltip <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) m_tooltip <span class="operator">=</span> <span class="keyword">new</span> Callout(m_chart); <span class="keyword">if</span> (state) { m_tooltip<span class="operator">-</span><span class="operator">></span>setText(<span class="type">QString</span>(<span class="string">"X: %1 \nY: %2 "</span>)<span class="operator">.</span>arg(point<span class="operator">.</span>x())<span class="operator">.</span>arg(point<span class="operator">.</span>y())); m_tooltip<span class="operator">-</span><span class="operator">></span>setAnchor(point); m_tooltip<span class="operator">-</span><span class="operator">></span>setZValue(<span class="number">11</span>); m_tooltip<span class="operator">-</span><span class="operator">></span>updateGeometry(); m_tooltip<span class="operator">-</span><span class="operator">></span>show(); } <span class="keyword">else</span> { m_tooltip<span class="operator">-</span><span class="operator">></span>hide(); } } </pre> </div> <!-- @@@callout/view.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>