themewidget.cpp Example File | Qt Charts 5.12.11

- Qt 5.12
- Qt Charts
- Chart Themes Example
- themewidget.cpp Example File
- Qt Charts | Commercial or GPLv3

# themewidget.cpp Example File

chartthemes/themewidget.cpp

     /****************************************************************************
     **
     ** 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
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     ** information use the contact form at https://www.qt.io/contact-us.
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     ** 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
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     #include "themewidget.h"
     #include "ui_themewidget.h"

     #include <QtCharts/QChartView>
     #include <QtCharts/QPieSeries>
     #include <QtCharts/QPieSlice>
     #include <QtCharts/QAbstractBarSeries>
     #include <QtCharts/QPercentBarSeries>
     #include <QtCharts/QStackedBarSeries>
     #include <QtCharts/QBarSeries>
     #include <QtCharts/QBarSet>
     #include <QtCharts/QLineSeries>
     #include <QtCharts/QSplineSeries>
     #include <QtCharts/QScatterSeries>
     #include <QtCharts/QAreaSeries>
     #include <QtCharts/QLegend>
     #include <QtWidgets/QGridLayout>
     #include <QtWidgets/QFormLayout>
     #include <QtWidgets/QComboBox>
     #include <QtWidgets/QSpinBox>
     #include <QtWidgets/QCheckBox>
     #include <QtWidgets/QGroupBox>
     #include <QtWidgets/QLabel>
     #include <QtCore/QRandomGenerator>
     #include <QtCharts/QBarCategoryAxis>
     #include <QtWidgets/QApplication>
     #include <QtCharts/QValueAxis>

     ThemeWidget::ThemeWidget(QWidget *parent) :
         QWidget(parent),
         m_listCount(3),
         m_valueMax(10),
         m_valueCount(7),
         m_dataTable(generateRandomData(m_listCount, m_valueMax, m_valueCount)),
         m_ui(new Ui_ThemeWidgetForm)
     {
         m_ui->setupUi(this);
         populateThemeBox();
         populateAnimationBox();
         populateLegendBox();

         //create charts

         QChartView *chartView;

         chartView = new QChartView(createAreaChart());
         m_ui->gridLayout->addWidget(chartView, 1, 0);
         m_charts << chartView;

         chartView = new QChartView(createPieChart());
         // Funny things happen if the pie slice labels do not fit the screen, so we ignore size policy
         chartView->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
         m_ui->gridLayout->addWidget(chartView, 1, 1);
         m_charts << chartView;

         chartView = new QChartView(createLineChart());
         m_ui->gridLayout->addWidget(chartView, 1, 2);
         m_charts << chartView;

         chartView = new QChartView(createBarChart(m_valueCount));
         m_ui->gridLayout->addWidget(chartView, 2, 0);
         m_charts << chartView;

         chartView = new QChartView(createSplineChart());
         m_ui->gridLayout->addWidget(chartView, 2, 1);
         m_charts << chartView;

         chartView = new QChartView(createScatterChart());
         m_ui->gridLayout->addWidget(chartView, 2, 2);
         m_charts << chartView;

         // Set defaults
         m_ui->antialiasCheckBox->setChecked(true);

         // Set the colors from the light theme as default ones
         QPalette pal = qApp->palette();
         pal.setColor(QPalette::Window, QRgb(0xf0f0f0));
         pal.setColor(QPalette::WindowText, QRgb(0x404044));
         qApp->setPalette(pal);

         updateUI();
     }

     ThemeWidget::~ThemeWidget()
     {
         delete m_ui;
     }

     DataTable ThemeWidget::generateRandomData(int listCount, int valueMax, int valueCount) const
     {
         DataTable dataTable;

         // generate random data
         for (int i(0); i < listCount; i++) {
             DataList dataList;
             qreal yValue(0);
             for (int j(0); j < valueCount; j++) {
                 yValue = yValue + QRandomGenerator::global()->bounded(valueMax / (qreal) valueCount);
                 QPointF value((j + QRandomGenerator::global()->generateDouble()) * ((qreal) m_valueMax / (qreal) valueCount),
                               yValue);
                 QString label = "Slice " + QString::number(i) + ":" + QString::number(j);
                 dataList << Data(value, label);
             }
             dataTable << dataList;
         }

         return dataTable;
     }

     void ThemeWidget::populateThemeBox()
     {
         // add items to theme combobox
         m_ui->themeComboBox->addItem("Light", QChart::ChartThemeLight);
         m_ui->themeComboBox->addItem("Blue Cerulean", QChart::ChartThemeBlueCerulean);
         m_ui->themeComboBox->addItem("Dark", QChart::ChartThemeDark);
         m_ui->themeComboBox->addItem("Brown Sand", QChart::ChartThemeBrownSand);
         m_ui->themeComboBox->addItem("Blue NCS", QChart::ChartThemeBlueNcs);
         m_ui->themeComboBox->addItem("High Contrast", QChart::ChartThemeHighContrast);
         m_ui->themeComboBox->addItem("Blue Icy", QChart::ChartThemeBlueIcy);
         m_ui->themeComboBox->addItem("Qt", QChart::ChartThemeQt);
     }

     void ThemeWidget::populateAnimationBox()
     {
         // add items to animation combobox
         m_ui->animatedComboBox->addItem("No Animations", QChart::NoAnimation);
         m_ui->animatedComboBox->addItem("GridAxis Animations", QChart::GridAxisAnimations);
         m_ui->animatedComboBox->addItem("Series Animations", QChart::SeriesAnimations);
         m_ui->animatedComboBox->addItem("All Animations", QChart::AllAnimations);
     }

     void ThemeWidget::populateLegendBox()
     {
         // add items to legend combobox
         m_ui->legendComboBox->addItem("No Legend ", 0);
         m_ui->legendComboBox->addItem("Legend Top", Qt::AlignTop);
         m_ui->legendComboBox->addItem("Legend Bottom", Qt::AlignBottom);
         m_ui->legendComboBox->addItem("Legend Left", Qt::AlignLeft);
         m_ui->legendComboBox->addItem("Legend Right", Qt::AlignRight);
     }

     QChart *ThemeWidget::createAreaChart() const
     {
         QChart *chart = new QChart();
         chart->setTitle("Area chart");

         // The lower series initialized to zero values
         QLineSeries *lowerSeries = 0;
         QString name("Series ");
         int nameIndex = 0;
         for (int i(0); i < m_dataTable.count(); i++) {
             QLineSeries *upperSeries = new QLineSeries(chart);
             for (int j(0); j < m_dataTable[i].count(); j++) {
                 Data data = m_dataTable[i].at(j);
                 if (lowerSeries) {
                     const QVector<QPointF>& points = lowerSeries->pointsVector();
                     upperSeries->append(QPointF(j, points[i].y() + data.first.y()));
                 } else {
                     upperSeries->append(QPointF(j, data.first.y()));
                 }
             }
             QAreaSeries *area = new QAreaSeries(upperSeries, lowerSeries);
             area->setName(name + QString::number(nameIndex));
             nameIndex++;
             chart->addSeries(area);
             lowerSeries = upperSeries;
         }

         chart->createDefaultAxes();
         chart->axes(Qt::Horizontal).first()->setRange(0, m_valueCount - 1);
         chart->axes(Qt::Vertical).first()->setRange(0, m_valueMax);
         // Add space to label to add space between labels and axis
         QValueAxis *axisY = qobject_cast<QValueAxis*>(chart->axes(Qt::Vertical).first());
         Q_ASSERT(axisY);
         axisY->setLabelFormat("%.1f  ");

         return chart;
     }

     QChart *ThemeWidget::createBarChart(int valueCount) const
     {
         Q_UNUSED(valueCount);
         QChart *chart = new QChart();
         chart->setTitle("Bar chart");

         QStackedBarSeries *series = new QStackedBarSeries(chart);
         for (int i(0); i < m_dataTable.count(); i++) {
             QBarSet *set = new QBarSet("Bar set " + QString::number(i));
             for (const Data &data : m_dataTable[i])
                 *set << data.first.y();
             series->append(set);
         }
         chart->addSeries(series);

         chart->createDefaultAxes();
         chart->axes(Qt::Vertical).first()->setRange(0, m_valueMax * 2);
         // Add space to label to add space between labels and axis
         QValueAxis *axisY = qobject_cast<QValueAxis*>(chart->axes(Qt::Vertical).first());
         Q_ASSERT(axisY);
         axisY->setLabelFormat("%.1f  ");

         return chart;
     }

     QChart *ThemeWidget::createLineChart() const
     {
         QChart *chart = new QChart();
         chart->setTitle("Line chart");

         QString name("Series ");
         int nameIndex = 0;
         for (const DataList &list : m_dataTable) {
             QLineSeries *series = new QLineSeries(chart);
             for (const Data &data : list)
                 series->append(data.first);
             series->setName(name + QString::number(nameIndex));
             nameIndex++;
             chart->addSeries(series);
         }

         chart->createDefaultAxes();
         chart->axes(Qt::Horizontal).first()->setRange(0, m_valueMax);
         chart->axes(Qt::Vertical).first()->setRange(0, m_valueCount);
         // Add space to label to add space between labels and axis
         QValueAxis *axisY = qobject_cast<QValueAxis*>(chart->axes(Qt::Vertical).first());
         Q_ASSERT(axisY);
         axisY->setLabelFormat("%.1f  ");

         return chart;
     }

     QChart *ThemeWidget::createPieChart() const
     {
         QChart *chart = new QChart();
         chart->setTitle("Pie chart");

         QPieSeries *series = new QPieSeries(chart);
         for (const Data &data : m_dataTable[0]) {
             QPieSlice *slice = series->append(data.second, data.first.y());
             if (data == m_dataTable[0].first()) {
                 // Show the first slice exploded with label
                 slice->setLabelVisible();
                 slice->setExploded();
                 slice->setExplodeDistanceFactor(0.5);
             }
         }
         series->setPieSize(0.4);
         chart->addSeries(series);

         return chart;
     }

     QChart *ThemeWidget::createSplineChart() const
     {
         QChart *chart = new QChart();
         chart->setTitle("Spline chart");
         QString name("Series ");
         int nameIndex = 0;
         for (const DataList &list : m_dataTable) {
             QSplineSeries *series = new QSplineSeries(chart);
             for (const Data &data : list)
                 series->append(data.first);
             series->setName(name + QString::number(nameIndex));
             nameIndex++;
             chart->addSeries(series);
         }

         chart->createDefaultAxes();
         chart->axes(Qt::Horizontal).first()->setRange(0, m_valueMax);
         chart->axes(Qt::Vertical).first()->setRange(0, m_valueCount);

         // Add space to label to add space between labels and axis
         QValueAxis *axisY = qobject_cast<QValueAxis*>(chart->axes(Qt::Vertical).first());
         Q_ASSERT(axisY);
         axisY->setLabelFormat("%.1f  ");
         return chart;
     }

     QChart *ThemeWidget::createScatterChart() const
     {
         // scatter chart
         QChart *chart = new QChart();
         chart->setTitle("Scatter chart");
         QString name("Series ");
         int nameIndex = 0;
         for (const DataList &list : m_dataTable) {
             QScatterSeries *series = new QScatterSeries(chart);
             for (const Data &data : list)
                 series->append(data.first);
             series->setName(name + QString::number(nameIndex));
             nameIndex++;
             chart->addSeries(series);
         }

         chart->createDefaultAxes();
         chart->axes(Qt::Horizontal).first()->setRange(0, m_valueMax);
         chart->axes(Qt::Vertical).first()->setRange(0, m_valueCount);
         // Add space to label to add space between labels and axis
         QValueAxis *axisY = qobject_cast<QValueAxis*>(chart->axes(Qt::Vertical).first());
         Q_ASSERT(axisY);
         axisY->setLabelFormat("%.1f  ");
         return chart;
     }

     void ThemeWidget::updateUI()
     {
         QChart::ChartTheme theme = static_cast<QChart::ChartTheme>(
                     m_ui->themeComboBox->itemData(m_ui->themeComboBox->currentIndex()).toInt());
         const auto charts = m_charts;
         if (!m_charts.isEmpty() && m_charts.at(0)->chart()->theme() != theme) {
             for (QChartView *chartView : charts) {
                 chartView->chart()->setTheme(theme);
             }

             // Set palette colors based on selected theme
             QPalette pal = window()->palette();
             if (theme == QChart::ChartThemeLight) {
                 pal.setColor(QPalette::Window, QRgb(0xf0f0f0));
                 pal.setColor(QPalette::WindowText, QRgb(0x404044));
             } else if (theme == QChart::ChartThemeDark) {
                 pal.setColor(QPalette::Window, QRgb(0x121218));
                 pal.setColor(QPalette::WindowText, QRgb(0xd6d6d6));
             } else if (theme == QChart::ChartThemeBlueCerulean) {
                 pal.setColor(QPalette::Window, QRgb(0x40434a));
                 pal.setColor(QPalette::WindowText, QRgb(0xd6d6d6));
             } else if (theme == QChart::ChartThemeBrownSand) {
                 pal.setColor(QPalette::Window, QRgb(0x9e8965));
                 pal.setColor(QPalette::WindowText, QRgb(0x404044));
             } else if (theme == QChart::ChartThemeBlueNcs) {
                 pal.setColor(QPalette::Window, QRgb(0x018bba));
                 pal.setColor(QPalette::WindowText, QRgb(0x404044));
             } else if (theme == QChart::ChartThemeHighContrast) {
                 pal.setColor(QPalette::Window, QRgb(0xffab03));
                 pal.setColor(QPalette::WindowText, QRgb(0x181818));
             } else if (theme == QChart::ChartThemeBlueIcy) {
                 pal.setColor(QPalette::Window, QRgb(0xcee7f0));
                 pal.setColor(QPalette::WindowText, QRgb(0x404044));
             } else {
                 pal.setColor(QPalette::Window, QRgb(0xf0f0f0));
                 pal.setColor(QPalette::WindowText, QRgb(0x404044));
             }
             window()->setPalette(pal);
         }

         // Update antialiasing
         bool checked = m_ui->antialiasCheckBox->isChecked();
         for (QChartView *chart : charts)
             chart->setRenderHint(QPainter::Antialiasing, checked);

         // Update animation options
         QChart::AnimationOptions options(
                     m_ui->animatedComboBox->itemData(m_ui->animatedComboBox->currentIndex()).toInt());
         if (!m_charts.isEmpty() && m_charts.at(0)->chart()->animationOptions() != options) {
             for (QChartView *chartView : charts)
                 chartView->chart()->setAnimationOptions(options);
         }

         // Update legend alignment
         Qt::Alignment alignment(
                     m_ui->legendComboBox->itemData(m_ui->legendComboBox->currentIndex()).toInt());

         if (!alignment) {
             for (QChartView *chartView : charts)
                 chartView->chart()->legend()->hide();
         } else {
             for (QChartView *chartView : charts) {
                 chartView->chart()->legend()->setAlignment(alignment);
                 chartView->chart()->legend()->show();
             }
         }
     }