themewidget.cpp Example File

chartthemes/themewidget.cpp
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** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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** This file is part of the Qt Charts module of the Qt Toolkit.
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#include "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/QTime>
#include <QtCharts/QBarCategoryAxis>

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_themeComboBox(createThemeBox()),
    m_antialiasCheckBox(new QCheckBox("Anti-aliasing")),
    m_animatedComboBox(createAnimationBox()),
    m_legendComboBox(createLegendBox())
{
    connectSignals();
    // create layout
    QGridLayout *baseLayout = new QGridLayout();
    QHBoxLayout *settingsLayout = new QHBoxLayout();
    settingsLayout->addWidget(new QLabel("Theme:"));
    settingsLayout->addWidget(m_themeComboBox);
    settingsLayout->addWidget(new QLabel("Animation:"));
    settingsLayout->addWidget(m_animatedComboBox);
    settingsLayout->addWidget(new QLabel("Legend:"));
    settingsLayout->addWidget(m_legendComboBox);
    settingsLayout->addWidget(m_antialiasCheckBox);
    settingsLayout->addStretch();
    baseLayout->addLayout(settingsLayout, 0, 0, 1, 3);

    //create charts

    QChartView *chartView;

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

    chartView = new QChartView(createBarChart(m_valueCount));
    baseLayout->addWidget(chartView, 1, 1);
    m_charts << chartView;

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

    chartView = new QChartView(createPieChart());
    chartView->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored); // funny things happen if the pie slice labels no not fit the screen...
    baseLayout->addWidget(chartView, 2, 0);
    m_charts << chartView;

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

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

    setLayout(baseLayout);

    // Set defaults
    m_antialiasCheckBox->setChecked(true);
    updateUI();
}

ThemeWidget::~ThemeWidget()
{
}

void ThemeWidget::connectSignals()
{
    connect(m_themeComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(updateUI()));
    connect(m_antialiasCheckBox, SIGNAL(toggled(bool)), this, SLOT(updateUI()));
    connect(m_animatedComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(updateUI()));
    connect(m_legendComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(updateUI()));
}

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

    // set seed for random stuff
    qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));

    // generate random data
    for (int i(0); i < listCount; i++) {
        DataList dataList;
        qreal yValue(0);
        for (int j(0); j < valueCount; j++) {
            yValue = yValue + (qreal)(qrand() % valueMax) / (qreal) valueCount;
            QPointF value((j + (qreal) rand() / (qreal) RAND_MAX) * ((qreal) m_valueMax / (qreal) valueCount),
                          yValue);
            QString label = "Slice " + QString::number(i) + ":" + QString::number(j);
            dataList << Data(value, label);
        }
        dataTable << dataList;
    }

    return dataTable;
}

QComboBox *ThemeWidget::createThemeBox() const
{
    // settings layout
    QComboBox *themeComboBox = new QComboBox();
    themeComboBox->addItem("Light", QChart::ChartThemeLight);
    themeComboBox->addItem("Blue Cerulean", QChart::ChartThemeBlueCerulean);
    themeComboBox->addItem("Dark", QChart::ChartThemeDark);
    themeComboBox->addItem("Brown Sand", QChart::ChartThemeBrownSand);
    themeComboBox->addItem("Blue NCS", QChart::ChartThemeBlueNcs);
    themeComboBox->addItem("High Contrast", QChart::ChartThemeHighContrast);
    themeComboBox->addItem("Blue Icy", QChart::ChartThemeBlueIcy);
    themeComboBox->addItem("Qt", QChart::ChartThemeQt);
    return themeComboBox;
}

QComboBox *ThemeWidget::createAnimationBox() const
{
    // settings layout
    QComboBox *animationComboBox = new QComboBox();
    animationComboBox->addItem("No Animations", QChart::NoAnimation);
    animationComboBox->addItem("GridAxis Animations", QChart::GridAxisAnimations);
    animationComboBox->addItem("Series Animations", QChart::SeriesAnimations);
    animationComboBox->addItem("All Animations", QChart::AllAnimations);
    return animationComboBox;
}

QComboBox *ThemeWidget::createLegendBox() const
{
    QComboBox *legendComboBox = new QComboBox();
    legendComboBox->addItem("No Legend ", 0);
    legendComboBox->addItem("Legend Top", Qt::AlignTop);
    legendComboBox->addItem("Legend Bottom", Qt::AlignBottom);
    legendComboBox->addItem("Legend Left", Qt::AlignLeft);
    legendComboBox->addItem("Legend Right", Qt::AlignRight);
    return legendComboBox;
}

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);
        chart->createDefaultAxes();
        lowerSeries = upperSeries;
    }

    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));
        foreach (Data data, m_dataTable[i])
            *set << data.first.y();
        series->append(set);
    }
    chart->addSeries(series);
    chart->createDefaultAxes();

    return chart;
}

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

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

    return chart;
}

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

    qreal pieSize = 1.0 / m_dataTable.count();
    for (int i = 0; i < m_dataTable.count(); i++) {
        QPieSeries *series = new QPieSeries(chart);
        foreach (Data data, m_dataTable[i]) {
            QPieSlice *slice = series->append(data.second, data.first.y());
            if (data == m_dataTable[i].first()) {
                slice->setLabelVisible();
                slice->setExploded();
            }
        }
        qreal hPos = (pieSize / 2) + (i / (qreal) m_dataTable.count());
        series->setPieSize(pieSize);
        series->setHorizontalPosition(hPos);
        series->setVerticalPosition(0.5);
        chart->addSeries(series);
    }

    return chart;
}

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

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

void ThemeWidget::updateUI()
{
    QChart::ChartTheme theme = (QChart::ChartTheme) m_themeComboBox->itemData(m_themeComboBox->currentIndex()).toInt();

    if (m_charts.at(0)->chart()->theme() != theme) {
        foreach (QChartView *chartView, m_charts)
            chartView->chart()->setTheme(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);
    }

    bool checked = m_antialiasCheckBox->isChecked();
    foreach (QChartView *chart, m_charts)
        chart->setRenderHint(QPainter::Antialiasing, checked);

    QChart::AnimationOptions options(m_animatedComboBox->itemData(m_animatedComboBox->currentIndex()).toInt());
    if (m_charts.at(0)->chart()->animationOptions() != options) {
        foreach (QChartView *chartView, m_charts)
            chartView->chart()->setAnimationOptions(options);
    }

    Qt::Alignment alignment(m_legendComboBox->itemData(m_legendComboBox->currentIndex()).toInt());

    if (!alignment) {
        foreach (QChartView *chartView, m_charts)
            chartView->chart()->legend()->hide();
    } else {
        foreach (QChartView *chartView, m_charts) {
            chartView->chart()->legend()->setAlignment(alignment);
            chartView->chart()->legend()->show();
        }
    }
}

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. 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.