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<h1 class="title">mainwidget.cpp Example File</h1>
<span class="subtitle">legendmarkers/mainwidget.cpp</span>
<!-- $$$legendmarkers/mainwidget.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 "mainwidget.h"</span>
<span class="preprocessor">#include <QtCharts/QChart></span>
<span class="preprocessor">#include <QtCharts/QChartView></span>
<span class="preprocessor">#include <QtWidgets/QPushButton></span>
<span class="preprocessor">#include <QtWidgets/QLabel></span>
<span class="preprocessor">#include <QtCore/QDebug></span>
<span class="preprocessor">#include <QtCharts/QLegend></span>
<span class="preprocessor">#include <QtWidgets/QFormLayout></span>
<span class="preprocessor">#include <QtCharts/QLegendMarker></span>
<span class="preprocessor">#include <QtCharts/QLineSeries></span>
<span class="preprocessor">#include <QtCharts/QXYLegendMarker></span>
<span class="preprocessor">#include <QtCore/QtMath></span>
QT_CHARTS_USE_NAMESPACE
MainWidget<span class="operator">::</span>MainWidget(<span class="type">QWidget</span> <span class="operator">*</span>parent) :
<span class="type">QWidget</span>(parent)
{
<span class="comment">// Create chart view with the chart</span>
m_chart <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>();
m_chartView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchartview.html">QChartView</a></span>(m_chart<span class="operator">,</span> <span class="keyword">this</span>);
<span class="comment">// Create layout for grid and detached legend</span>
m_mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGridLayout</span>();
m_mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(m_chartView<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">1</span>);
setLayout(m_mainLayout);
<span class="comment">// Add few series</span>
addSeries();
addSeries();
addSeries();
addSeries();
connectMarkers();
<span class="comment">// Set the title and show legend</span>
m_chart<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Legendmarker example (click on legend)"</span>);
m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">true</span>);
m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>setAlignment(<span class="type">Qt</span><span class="operator">::</span>AlignBottom);
m_chartView<span class="operator">-</span><span class="operator">></span>setRenderHint(<span class="type">QPainter</span><span class="operator">::</span>Antialiasing);
}
<span class="type">void</span> MainWidget<span class="operator">::</span>addSeries()
{
<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>();
m_series<span class="operator">.</span>append(series);
series<span class="operator">-</span><span class="operator">></span>setName(<span class="type">QString</span>(<span class="string">"line "</span> <span class="operator">+</span> <span class="type">QString</span><span class="operator">::</span>number(m_series<span class="operator">.</span>count())));
<span class="comment">// Make some sine wave for data</span>
<span class="type">QList</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> data;
<span class="type">int</span> offset <span class="operator">=</span> m_chart<span class="operator">-</span><span class="operator">></span>series()<span class="operator">.</span>count();
<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">360</span>; i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type">qreal</span> x <span class="operator">=</span> offset <span class="operator">*</span> <span class="number">20</span> <span class="operator">+</span> i;
data<span class="operator">.</span>append(<span class="type">QPointF</span>(i<span class="operator">,</span> qSin(<span class="number">2.0</span> <span class="operator">*</span> <span class="number">3.141592</span> <span class="operator">*</span> x <span class="operator">/</span> <span class="number">360.0</span>)));
}
series<span class="operator">-</span><span class="operator">></span>append(data);
m_chart<span class="operator">-</span><span class="operator">></span>addSeries(series);
<span class="keyword">if</span> (m_series<span class="operator">.</span>count() <span class="operator">=</span><span class="operator">=</span> <span class="number">1</span>)
m_chart<span class="operator">-</span><span class="operator">></span>createDefaultAxes();
}
<span class="type">void</span> MainWidget<span class="operator">::</span>removeSeries()
{
<span class="comment">// Remove last series from chart</span>
<span class="keyword">if</span> (m_series<span class="operator">.</span>count() <span class="operator">></span> <span class="number">0</span>) {
<span class="type"><a href="qlineseries.html">QLineSeries</a></span> <span class="operator">*</span>series <span class="operator">=</span> m_series<span class="operator">.</span>last();
m_chart<span class="operator">-</span><span class="operator">></span>removeSeries(series);
m_series<span class="operator">.</span>removeLast();
<span class="keyword">delete</span> series;
}
}
<span class="type">void</span> MainWidget<span class="operator">::</span>connectMarkers()
{
<span class="comment">// Connect all markers to handler</span>
<span class="keyword">const</span> <span class="keyword">auto</span> markers <span class="operator">=</span> m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>markers();
<span class="keyword">for</span> (<span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span> <span class="operator">*</span>marker : markers) {
<span class="comment">// Disconnect possible existing connection to avoid multiple connections</span>
<span class="type">QObject</span><span class="operator">::</span>disconnect(marker<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">::</span>clicked<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWidget<span class="operator">::</span>handleMarkerClicked);
<span class="type">QObject</span><span class="operator">::</span>connect(marker<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWidget<span class="operator">::</span>handleMarkerClicked);
}
}
<span class="type">void</span> MainWidget<span class="operator">::</span>disconnectMarkers()
{
<span class="keyword">const</span> <span class="keyword">auto</span> markers <span class="operator">=</span> m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>markers();
<span class="keyword">for</span> (<span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span> <span class="operator">*</span>marker : markers) {
<span class="type">QObject</span><span class="operator">::</span>disconnect(marker<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">::</span>clicked<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>MainWidget<span class="operator">::</span>handleMarkerClicked);
}
}
<span class="type">void</span> MainWidget<span class="operator">::</span>handleMarkerClicked()
{
<span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">*</span> marker <span class="operator">=</span> qobject_cast<span class="operator"><</span><span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">*</span><span class="operator">></span> (sender());
Q_ASSERT(marker);
<span class="keyword">switch</span> (marker<span class="operator">-</span><span class="operator">></span>type())
{
<span class="keyword">case</span> <span class="type"><a href="qlegendmarker.html">QLegendMarker</a></span><span class="operator">::</span>LegendMarkerTypeXY:
{
<span class="comment">// Toggle visibility of series</span>
marker<span class="operator">-</span><span class="operator">></span>series()<span class="operator">-</span><span class="operator">></span>setVisible(<span class="operator">!</span>marker<span class="operator">-</span><span class="operator">></span>series()<span class="operator">-</span><span class="operator">></span>isVisible());
<span class="comment">// Turn legend marker back to visible, since hiding series also hides the marker</span>
<span class="comment">// and we don't want it to happen now.</span>
marker<span class="operator">-</span><span class="operator">></span>setVisible(<span class="keyword">true</span>);
<span class="comment">// Dim the marker, if series is not visible</span>
<span class="type">qreal</span> alpha <span class="operator">=</span> <span class="number">1.0</span>;
<span class="keyword">if</span> (<span class="operator">!</span>marker<span class="operator">-</span><span class="operator">></span>series()<span class="operator">-</span><span class="operator">></span>isVisible())
alpha <span class="operator">=</span> <span class="number">0.5</span>;
<span class="type">QColor</span> color;
<span class="type">QBrush</span> brush <span class="operator">=</span> marker<span class="operator">-</span><span class="operator">></span>labelBrush();
color <span class="operator">=</span> brush<span class="operator">.</span>color();
color<span class="operator">.</span>setAlphaF(alpha);
brush<span class="operator">.</span>setColor(color);
marker<span class="operator">-</span><span class="operator">></span>setLabelBrush(brush);
brush <span class="operator">=</span> marker<span class="operator">-</span><span class="operator">></span>brush();
color <span class="operator">=</span> brush<span class="operator">.</span>color();
color<span class="operator">.</span>setAlphaF(alpha);
brush<span class="operator">.</span>setColor(color);
marker<span class="operator">-</span><span class="operator">></span>setBrush(brush);
<span class="type">QPen</span> pen <span class="operator">=</span> marker<span class="operator">-</span><span class="operator">></span>pen();
color <span class="operator">=</span> pen<span class="operator">.</span>color();
color<span class="operator">.</span>setAlphaF(alpha);
pen<span class="operator">.</span>setColor(color);
marker<span class="operator">-</span><span class="operator">></span>setPen(pen);
<span class="keyword">break</span>;
}
<span class="keyword">default</span>:
{
qDebug() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Unknown marker type"</span>;
<span class="keyword">break</span>;
}
}
}
</pre>
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<!-- @@@legendmarkers/mainwidget.cpp -->
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<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
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