themewidget.cpp Example File

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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();
          }
      }
  }