Qt 5.9 | Qt Charts | Pie Chart Customization Example | mainwidget.cpp Example File

Qt 5.9.3 Reference Documentation

# mainwidget.cpp Example File

piechartcustomization/mainwidget.cpp

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      ** Contact: https://www.qt.io/licensing/
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      #include "mainwidget.h"
      #include "customslice.h"
      #include "pentool.h"
      #include "brushtool.h"
      #include <QtWidgets/QPushButton>
      #include <QtWidgets/QComboBox>
      #include <QtWidgets/QCheckBox>
      #include <QtWidgets/QLineEdit>
      #include <QtWidgets/QGroupBox>
      #include <QtWidgets/QDoubleSpinBox>
      #include <QtWidgets/QFormLayout>
      #include <QtWidgets/QFontDialog>
      #include <QtCharts/QChartView>
      #include <QtCharts/QPieSeries>

      QT_CHARTS_USE_NAMESPACE

      MainWidget::MainWidget(QWidget *parent)
          : QWidget(parent),
            m_slice(0)
      {
          // create chart
          QChart *chart = new QChart;
          chart->setTitle("Piechart customization");
          chart->setAnimationOptions(QChart::AllAnimations);

          // create series
          m_series = new QPieSeries();
          *m_series << new CustomSlice("Slice 1", 10.0);
          *m_series << new CustomSlice("Slice 2", 20.0);
          *m_series << new CustomSlice("Slice 3", 30.0);
          *m_series << new CustomSlice("Slice 4", 40.0);
          *m_series << new CustomSlice("Slice 5", 50.0);
          m_series->setLabelsVisible();
          chart->addSeries(m_series);

          connect(m_series, &QPieSeries::clicked, this, &MainWidget::handleSliceClicked);

          // chart settings
          m_themeComboBox = new QComboBox();
          m_themeComboBox->addItem("Light", QChart::ChartThemeLight);
          m_themeComboBox->addItem("BlueCerulean", QChart::ChartThemeBlueCerulean);
          m_themeComboBox->addItem("Dark", QChart::ChartThemeDark);
          m_themeComboBox->addItem("BrownSand", QChart::ChartThemeBrownSand);
          m_themeComboBox->addItem("BlueNcs", QChart::ChartThemeBlueNcs);
          m_themeComboBox->addItem("High Contrast", QChart::ChartThemeHighContrast);
          m_themeComboBox->addItem("Blue Icy", QChart::ChartThemeBlueIcy);
          m_themeComboBox->addItem("Qt", QChart::ChartThemeQt);

          m_aaCheckBox = new QCheckBox();
          m_animationsCheckBox = new QCheckBox();
          m_animationsCheckBox->setCheckState(Qt::Checked);

          m_legendCheckBox = new QCheckBox();

          QFormLayout *chartSettingsLayout = new QFormLayout();
          chartSettingsLayout->addRow("Theme", m_themeComboBox);
          chartSettingsLayout->addRow("Antialiasing", m_aaCheckBox);
          chartSettingsLayout->addRow("Animations", m_animationsCheckBox);
          chartSettingsLayout->addRow("Legend", m_legendCheckBox);
          QGroupBox *chartSettings = new QGroupBox("Chart");
          chartSettings->setLayout(chartSettingsLayout);

          connect(m_themeComboBox, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
                  this, &MainWidget::updateChartSettings);
          connect(m_aaCheckBox, &QCheckBox::toggled, this, &MainWidget::updateChartSettings);
          connect(m_animationsCheckBox, &QCheckBox::toggled, this, &MainWidget::updateChartSettings);
          connect(m_legendCheckBox, &QCheckBox::toggled, this, &MainWidget::updateChartSettings);

          // series settings
          m_hPosition = new QDoubleSpinBox();
          m_hPosition->setMinimum(0.0);
          m_hPosition->setMaximum(1.0);
          m_hPosition->setSingleStep(0.1);
          m_hPosition->setValue(m_series->horizontalPosition());

          m_vPosition = new QDoubleSpinBox();
          m_vPosition->setMinimum(0.0);
          m_vPosition->setMaximum(1.0);
          m_vPosition->setSingleStep(0.1);
          m_vPosition->setValue(m_series->verticalPosition());

          m_sizeFactor = new QDoubleSpinBox();
          m_sizeFactor->setMinimum(0.0);
          m_sizeFactor->setMaximum(1.0);
          m_sizeFactor->setSingleStep(0.1);
          m_sizeFactor->setValue(m_series->pieSize());

          m_startAngle = new QDoubleSpinBox();
          m_startAngle->setMinimum(-720);
          m_startAngle->setMaximum(720);
          m_startAngle->setValue(m_series->pieStartAngle());
          m_startAngle->setSingleStep(1);

          m_endAngle = new QDoubleSpinBox();
          m_endAngle->setMinimum(-720);
          m_endAngle->setMaximum(720);
          m_endAngle->setValue(m_series->pieEndAngle());
          m_endAngle->setSingleStep(1);

          m_holeSize = new QDoubleSpinBox();
          m_holeSize->setMinimum(0.0);
          m_holeSize->setMaximum(1.0);
          m_holeSize->setSingleStep(0.1);
          m_holeSize->setValue(m_series->holeSize());

          QPushButton *appendSlice = new QPushButton("Append slice");
          QPushButton *insertSlice = new QPushButton("Insert slice");
          QPushButton *removeSlice = new QPushButton("Remove selected slice");

          QFormLayout *seriesSettingsLayout = new QFormLayout();
          seriesSettingsLayout->addRow("Horizontal position", m_hPosition);
          seriesSettingsLayout->addRow("Vertical position", m_vPosition);
          seriesSettingsLayout->addRow("Size factor", m_sizeFactor);
          seriesSettingsLayout->addRow("Start angle", m_startAngle);
          seriesSettingsLayout->addRow("End angle", m_endAngle);
          seriesSettingsLayout->addRow("Hole size", m_holeSize);
          seriesSettingsLayout->addRow(appendSlice);
          seriesSettingsLayout->addRow(insertSlice);
          seriesSettingsLayout->addRow(removeSlice);
          QGroupBox *seriesSettings = new QGroupBox("Series");
          seriesSettings->setLayout(seriesSettingsLayout);

          connect(m_vPosition,
                  static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
                  this, &MainWidget::updateSerieSettings);
          connect(m_hPosition,
                  static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
                  this, &MainWidget::updateSerieSettings);
          connect(m_sizeFactor,
                  static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
                  this, &MainWidget::updateSerieSettings);
          connect(m_startAngle,
                  static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
                  this, &MainWidget::updateSerieSettings);
          connect(m_endAngle,
                  static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
                  this, &MainWidget::updateSerieSettings);
          connect(m_holeSize,
                  static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
                  this, &MainWidget::updateSerieSettings);
          connect(appendSlice, &QPushButton::clicked, this, &MainWidget::appendSlice);
          connect(insertSlice, &QPushButton::clicked, this, &MainWidget::insertSlice);
          connect(removeSlice, &QPushButton::clicked, this, &MainWidget::removeSlice);

          // slice settings
          m_sliceName = new QLineEdit("<click a slice>");
          m_sliceName->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Maximum);
          m_sliceValue = new QDoubleSpinBox();
          m_sliceValue->setMaximum(1000);
          m_sliceLabelVisible = new QCheckBox();
          m_sliceLabelArmFactor = new QDoubleSpinBox();
          m_sliceLabelArmFactor->setSingleStep(0.01);
          m_sliceExploded = new QCheckBox();
          m_sliceExplodedFactor = new QDoubleSpinBox();
          m_sliceExplodedFactor->setSingleStep(0.01);
          m_pen = new QPushButton();
          m_penTool = new PenTool("Slice pen", this);
          m_brush = new QPushButton();
          m_brushTool = new BrushTool("Slice brush", this);
          m_font = new QPushButton();
          m_labelBrush = new QPushButton();
          m_labelBrushTool = new BrushTool("Label brush", this);
          m_labelPosition = new QComboBox(this);
          m_labelPosition->addItem("Outside", QPieSlice::LabelOutside);
          m_labelPosition->addItem("Inside horizontal", QPieSlice::LabelInsideHorizontal);
          m_labelPosition->addItem("Inside tangential", QPieSlice::LabelInsideTangential);
          m_labelPosition->addItem("Inside normal", QPieSlice::LabelInsideNormal);

          QFormLayout *sliceSettingsLayout = new QFormLayout();
          sliceSettingsLayout->addRow("Label", m_sliceName);
          sliceSettingsLayout->addRow("Value", m_sliceValue);
          sliceSettingsLayout->addRow("Pen", m_pen);
          sliceSettingsLayout->addRow("Brush", m_brush);
          sliceSettingsLayout->addRow("Label visible", m_sliceLabelVisible);
          sliceSettingsLayout->addRow("Label font", m_font);
          sliceSettingsLayout->addRow("Label brush", m_labelBrush);
          sliceSettingsLayout->addRow("Label position", m_labelPosition);
          sliceSettingsLayout->addRow("Label arm length", m_sliceLabelArmFactor);
          sliceSettingsLayout->addRow("Exploded", m_sliceExploded);
          sliceSettingsLayout->addRow("Explode distance", m_sliceExplodedFactor);
          QGroupBox *sliceSettings = new QGroupBox("Selected slice");
          sliceSettings->setLayout(sliceSettingsLayout);

          connect(m_sliceName, &QLineEdit::textChanged, this, &MainWidget::updateSliceSettings);
          connect(m_sliceValue,
                  static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
                  this, &MainWidget::updateSliceSettings);
          connect(m_pen, &QPushButton::clicked, m_penTool, &PenTool::show);
          connect(m_penTool, &PenTool::changed, this, &MainWidget::updateSliceSettings);
          connect(m_brush, &QPushButton::clicked, m_brushTool, &BrushTool::show);
          connect(m_brushTool, &BrushTool::changed, this, &MainWidget::updateSliceSettings);
          connect(m_font, &QPushButton::clicked, this, &MainWidget::showFontDialog);
          connect(m_labelBrush, &QPushButton::clicked, m_labelBrushTool, &BrushTool::show);
          connect(m_labelBrushTool, &BrushTool::changed, this, &MainWidget::updateSliceSettings);
          connect(m_sliceLabelVisible, &QCheckBox::toggled, this, &MainWidget::updateSliceSettings);
          connect(m_sliceLabelVisible, &QCheckBox::toggled, this, &MainWidget::updateSliceSettings);
          connect(m_sliceLabelArmFactor,
                  static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
                  this, &MainWidget::updateSliceSettings);
          connect(m_sliceExploded, &QCheckBox::toggled, this, &MainWidget::updateSliceSettings);
          connect(m_sliceExplodedFactor,
                  static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged),
                  this, &MainWidget::updateSliceSettings);
          connect(m_labelPosition,
                  static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
                  this, &MainWidget::updateSliceSettings);

          // create chart view
          m_chartView = new QChartView(chart);

          // create main layout
          QVBoxLayout *settingsLayout = new QVBoxLayout();
          settingsLayout->addWidget(chartSettings);
          settingsLayout->addWidget(seriesSettings);
          settingsLayout->addWidget(sliceSettings);
          settingsLayout->addStretch();

          QGridLayout *baseLayout = new QGridLayout();
          baseLayout->addLayout(settingsLayout, 0, 0);
          baseLayout->addWidget(m_chartView, 0, 1);
          setLayout(baseLayout);

          updateSerieSettings();
          updateChartSettings();
      }

      void MainWidget::updateChartSettings()
      {
          QChart::ChartTheme theme = static_cast<QChart::ChartTheme>(m_themeComboBox->itemData(
                      m_themeComboBox->currentIndex()).toInt());
          m_chartView->chart()->setTheme(theme);
          m_chartView->setRenderHint(QPainter::Antialiasing, m_aaCheckBox->isChecked());

          if (m_animationsCheckBox->checkState() == Qt::Checked)
              m_chartView->chart()->setAnimationOptions(QChart::AllAnimations);
          else
              m_chartView->chart()->setAnimationOptions(QChart::NoAnimation);

          if (m_legendCheckBox->checkState() == Qt::Checked)
              m_chartView->chart()->legend()->show();
          else
              m_chartView->chart()->legend()->hide();
      }

      void MainWidget::updateSerieSettings()
      {
          m_series->setHorizontalPosition(m_hPosition->value());
          m_series->setVerticalPosition(m_vPosition->value());
          m_series->setPieSize(m_sizeFactor->value());
          m_holeSize->setMaximum(m_sizeFactor->value());
          m_series->setPieStartAngle(m_startAngle->value());
          m_series->setPieEndAngle(m_endAngle->value());
          m_series->setHoleSize(m_holeSize->value());
      }

      void MainWidget::updateSliceSettings()
      {
          if (!m_slice)
              return;

          m_slice->setLabel(m_sliceName->text());

          m_slice->setValue(m_sliceValue->value());

          m_slice->setPen(m_penTool->pen());
          m_slice->setBrush(m_brushTool->brush());

          m_slice->setLabelBrush(m_labelBrushTool->brush());
          m_slice->setLabelVisible(m_sliceLabelVisible->isChecked());
          m_slice->setLabelArmLengthFactor(m_sliceLabelArmFactor->value());
          // We assume that label position index is in sync with the enum
          m_slice->setLabelPosition((QPieSlice::LabelPosition)m_labelPosition->currentIndex());

          m_slice->setExploded(m_sliceExploded->isChecked());
          m_slice->setExplodeDistanceFactor(m_sliceExplodedFactor->value());
      }

      void MainWidget::handleSliceClicked(QPieSlice *slice)
      {
          m_slice = static_cast<CustomSlice *>(slice);

          // name
          m_sliceName->blockSignals(true);
          m_sliceName->setText(slice->label());
          m_sliceName->blockSignals(false);

          // value
          m_sliceValue->blockSignals(true);
          m_sliceValue->setValue(slice->value());
          m_sliceValue->blockSignals(false);

          // pen
          m_pen->setText(PenTool::name(m_slice->pen()));
          m_penTool->setPen(m_slice->pen());

          // brush
          m_brush->setText(m_slice->originalBrush().color().name());
          m_brushTool->setBrush(m_slice->originalBrush());

          // label
          m_labelBrush->setText(BrushTool::name(m_slice->labelBrush()));
          m_labelBrushTool->setBrush(m_slice->labelBrush());
          m_font->setText(slice->labelFont().toString());
          m_sliceLabelVisible->blockSignals(true);
          m_sliceLabelVisible->setChecked(slice->isLabelVisible());
          m_sliceLabelVisible->blockSignals(false);
          m_sliceLabelArmFactor->blockSignals(true);
          m_sliceLabelArmFactor->setValue(slice->labelArmLengthFactor());
          m_sliceLabelArmFactor->blockSignals(false);
          m_labelPosition->blockSignals(true);
          // We assume that label position index is in sync with the enum
          m_labelPosition->setCurrentIndex(slice->labelPosition());
          m_labelPosition->blockSignals(false);

          // exploded
          m_sliceExploded->blockSignals(true);
          m_sliceExploded->setChecked(slice->isExploded());
          m_sliceExploded->blockSignals(false);
          m_sliceExplodedFactor->blockSignals(true);
          m_sliceExplodedFactor->setValue(slice->explodeDistanceFactor());
          m_sliceExplodedFactor->blockSignals(false);
      }

      void MainWidget::showFontDialog()
      {
          if (!m_slice)
              return;

          QFontDialog dialog(m_slice->labelFont());
          dialog.show();
          dialog.exec();

          m_slice->setLabelFont(dialog.currentFont());
          m_font->setText(dialog.currentFont().toString());
      }

      void MainWidget::appendSlice()
      {
          *m_series << new CustomSlice("Slice " + QString::number(m_series->count() + 1), 10.0);
      }

      void MainWidget::insertSlice()
      {
          if (!m_slice)
              return;

          int i = m_series->slices().indexOf(m_slice);

          m_series->insert(i, new CustomSlice("Slice " + QString::number(m_series->count() + 1), 10.0));
      }

      void MainWidget::removeSlice()
      {
          if (!m_slice)
              return;

          m_sliceName->setText("<click a slice>");

          m_series->remove(m_slice);
          m_slice = 0;
      }

      #include "moc_mainwidget.cpp"