<?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>callout.cpp Example File | Qt Charts 5.12.6</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="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-callout-example.html">Callout Example</a></td><td >callout.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtcharts-index.html">Qt Charts | 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">callout.cpp Example File</h1> <span class="subtitle">callout/callout.cpp</span> <!-- $$$callout/callout.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 "callout.h"</span> <span class="preprocessor">#include <QtGui/QPainter></span> <span class="preprocessor">#include <QtGui/QFontMetrics></span> <span class="preprocessor">#include <QtWidgets/QGraphicsSceneMouseEvent></span> <span class="preprocessor">#include <QtGui/QMouseEvent></span> <span class="preprocessor">#include <QtCharts/QChart></span> Callout<span class="operator">::</span>Callout(<span class="type"><a href="qchart.html">QChart</a></span> <span class="operator">*</span>chart): <span class="type">QGraphicsItem</span>(chart)<span class="operator">,</span> m_chart(chart) { } <span class="type">QRectF</span> Callout<span class="operator">::</span>boundingRect() <span class="keyword">const</span> { <span class="type">QPointF</span> anchor <span class="operator">=</span> mapFromParent(m_chart<span class="operator">-</span><span class="operator">></span>mapToPosition(m_anchor)); <span class="type">QRectF</span> rect; rect<span class="operator">.</span>setLeft(qMin(m_rect<span class="operator">.</span>left()<span class="operator">,</span> anchor<span class="operator">.</span>x())); rect<span class="operator">.</span>setRight(qMax(m_rect<span class="operator">.</span>right()<span class="operator">,</span> anchor<span class="operator">.</span>x())); rect<span class="operator">.</span>setTop(qMin(m_rect<span class="operator">.</span>top()<span class="operator">,</span> anchor<span class="operator">.</span>y())); rect<span class="operator">.</span>setBottom(qMax(m_rect<span class="operator">.</span>bottom()<span class="operator">,</span> anchor<span class="operator">.</span>y())); <span class="keyword">return</span> rect; } <span class="type">void</span> Callout<span class="operator">::</span>paint(<span class="type">QPainter</span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QStyleOptionGraphicsItem</span> <span class="operator">*</span>option<span class="operator">,</span> <span class="type">QWidget</span> <span class="operator">*</span>widget) { Q_UNUSED(option) Q_UNUSED(widget) <span class="type">QPainterPath</span> path; path<span class="operator">.</span>addRoundedRect(m_rect<span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> <span class="number">5</span>); <span class="type">QPointF</span> anchor <span class="operator">=</span> mapFromParent(m_chart<span class="operator">-</span><span class="operator">></span>mapToPosition(m_anchor)); <span class="keyword">if</span> (<span class="operator">!</span>m_rect<span class="operator">.</span>contains(anchor)) { <span class="type">QPointF</span> point1<span class="operator">,</span> point2; <span class="comment">// establish the position of the anchor point in relation to m_rect</span> bool above <span class="operator">=</span> anchor<span class="operator">.</span>y() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>top(); bool aboveCenter <span class="operator">=</span> anchor<span class="operator">.</span>y() <span class="operator">></span> m_rect<span class="operator">.</span>top() <span class="operator">&</span><span class="operator">&</span> anchor<span class="operator">.</span>y() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>center()<span class="operator">.</span>y(); bool belowCenter <span class="operator">=</span> anchor<span class="operator">.</span>y() <span class="operator">></span> m_rect<span class="operator">.</span>center()<span class="operator">.</span>y() <span class="operator">&</span><span class="operator">&</span> anchor<span class="operator">.</span>y() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>bottom(); bool below <span class="operator">=</span> anchor<span class="operator">.</span>y() <span class="operator">></span> m_rect<span class="operator">.</span>bottom(); bool onLeft <span class="operator">=</span> anchor<span class="operator">.</span>x() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>left(); bool leftOfCenter <span class="operator">=</span> anchor<span class="operator">.</span>x() <span class="operator">></span> m_rect<span class="operator">.</span>left() <span class="operator">&</span><span class="operator">&</span> anchor<span class="operator">.</span>x() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>center()<span class="operator">.</span>x(); bool rightOfCenter <span class="operator">=</span> anchor<span class="operator">.</span>x() <span class="operator">></span> m_rect<span class="operator">.</span>center()<span class="operator">.</span>x() <span class="operator">&</span><span class="operator">&</span> anchor<span class="operator">.</span>x() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>right(); bool onRight <span class="operator">=</span> anchor<span class="operator">.</span>x() <span class="operator">></span> m_rect<span class="operator">.</span>right(); <span class="comment">// get the nearest m_rect corner.</span> <span class="type">qreal</span> x <span class="operator">=</span> (onRight <span class="operator">+</span> rightOfCenter) <span class="operator">*</span> m_rect<span class="operator">.</span>width(); <span class="type">qreal</span> y <span class="operator">=</span> (below <span class="operator">+</span> belowCenter) <span class="operator">*</span> m_rect<span class="operator">.</span>height(); bool cornerCase <span class="operator">=</span> (above <span class="operator">&</span><span class="operator">&</span> onLeft) <span class="operator">|</span><span class="operator">|</span> (above <span class="operator">&</span><span class="operator">&</span> onRight) <span class="operator">|</span><span class="operator">|</span> (below <span class="operator">&</span><span class="operator">&</span> onLeft) <span class="operator">|</span><span class="operator">|</span> (below <span class="operator">&</span><span class="operator">&</span> onRight); bool vertical <span class="operator">=</span> qAbs(anchor<span class="operator">.</span>x() <span class="operator">-</span> x) <span class="operator">></span> qAbs(anchor<span class="operator">.</span>y() <span class="operator">-</span> y); <span class="type">qreal</span> x1 <span class="operator">=</span> x <span class="operator">+</span> leftOfCenter <span class="operator">*</span> <span class="number">10</span> <span class="operator">-</span> rightOfCenter <span class="operator">*</span> <span class="number">20</span> <span class="operator">+</span> cornerCase <span class="operator">*</span> <span class="operator">!</span>vertical <span class="operator">*</span> (onLeft <span class="operator">*</span> <span class="number">10</span> <span class="operator">-</span> onRight <span class="operator">*</span> <span class="number">20</span>); <span class="type">qreal</span> y1 <span class="operator">=</span> y <span class="operator">+</span> aboveCenter <span class="operator">*</span> <span class="number">10</span> <span class="operator">-</span> belowCenter <span class="operator">*</span> <span class="number">20</span> <span class="operator">+</span> cornerCase <span class="operator">*</span> vertical <span class="operator">*</span> (above <span class="operator">*</span> <span class="number">10</span> <span class="operator">-</span> below <span class="operator">*</span> <span class="number">20</span>);; point1<span class="operator">.</span>setX(x1); point1<span class="operator">.</span>setY(y1); <span class="type">qreal</span> x2 <span class="operator">=</span> x <span class="operator">+</span> leftOfCenter <span class="operator">*</span> <span class="number">20</span> <span class="operator">-</span> rightOfCenter <span class="operator">*</span> <span class="number">10</span> <span class="operator">+</span> cornerCase <span class="operator">*</span> <span class="operator">!</span>vertical <span class="operator">*</span> (onLeft <span class="operator">*</span> <span class="number">20</span> <span class="operator">-</span> onRight <span class="operator">*</span> <span class="number">10</span>);; <span class="type">qreal</span> y2 <span class="operator">=</span> y <span class="operator">+</span> aboveCenter <span class="operator">*</span> <span class="number">20</span> <span class="operator">-</span> belowCenter <span class="operator">*</span> <span class="number">10</span> <span class="operator">+</span> cornerCase <span class="operator">*</span> vertical <span class="operator">*</span> (above <span class="operator">*</span> <span class="number">20</span> <span class="operator">-</span> below <span class="operator">*</span> <span class="number">10</span>);; point2<span class="operator">.</span>setX(x2); point2<span class="operator">.</span>setY(y2); path<span class="operator">.</span>moveTo(point1); path<span class="operator">.</span>lineTo(anchor); path<span class="operator">.</span>lineTo(point2); path <span class="operator">=</span> path<span class="operator">.</span>simplified(); } painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type">QColor</span>(<span class="number">255</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> <span class="number">255</span>)); painter<span class="operator">-</span><span class="operator">></span>drawPath(path); painter<span class="operator">-</span><span class="operator">></span>drawText(m_textRect<span class="operator">,</span> m_text); } <span class="type">void</span> Callout<span class="operator">::</span>mousePressEvent(<span class="type">QGraphicsSceneMouseEvent</span> <span class="operator">*</span>event) { event<span class="operator">-</span><span class="operator">></span>setAccepted(<span class="keyword">true</span>); } <span class="type">void</span> Callout<span class="operator">::</span>mouseMoveEvent(<span class="type">QGraphicsSceneMouseEvent</span> <span class="operator">*</span>event) { <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>buttons() <span class="operator">&</span> <span class="type">Qt</span><span class="operator">::</span>LeftButton){ setPos(mapToParent(event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> event<span class="operator">-</span><span class="operator">></span>buttonDownPos(<span class="type">Qt</span><span class="operator">::</span>LeftButton))); event<span class="operator">-</span><span class="operator">></span>setAccepted(<span class="keyword">true</span>); } <span class="keyword">else</span> { event<span class="operator">-</span><span class="operator">></span>setAccepted(<span class="keyword">false</span>); } } <span class="type">void</span> Callout<span class="operator">::</span>setText(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>text) { m_text <span class="operator">=</span> text; <span class="type">QFontMetrics</span> metrics(m_font); m_textRect <span class="operator">=</span> metrics<span class="operator">.</span>boundingRect(<span class="type">QRect</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">150</span><span class="operator">,</span> <span class="number">150</span>)<span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>AlignLeft<span class="operator">,</span> m_text); m_textRect<span class="operator">.</span>translate(<span class="number">5</span><span class="operator">,</span> <span class="number">5</span>); prepareGeometryChange(); m_rect <span class="operator">=</span> m_textRect<span class="operator">.</span>adjusted(<span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> <span class="number">5</span>); } <span class="type">void</span> Callout<span class="operator">::</span>setAnchor(<span class="type">QPointF</span> point) { m_anchor <span class="operator">=</span> point; } <span class="type">void</span> Callout<span class="operator">::</span>updateGeometry() { prepareGeometryChange(); setPos(m_chart<span class="operator">-</span><span class="operator">></span>mapToPosition(m_anchor) <span class="operator">+</span> <span class="type">QPoint</span>(<span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">50</span>)); } </pre> </div> <!-- @@@callout/callout.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>