HG_REPOSITORIES/LPP/INSTRUMENTATION/USERS/JEANDET/qtcharts Commit - r286:85d5e94564e0

Merge branch 'master' of https://git.it.local/repos/QtCommercialDevel-13049/charts...

Marek Rosa -

r286:85d5e94564e0

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r286:85d5e94564e0

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example/gdpbarchart/widget.cpp +2 -1

             /*!
                 \class Widget
                 \brief Ui for the application.
                 \internal
             */
             #include "widget.h"
             #include <QGridLayout>
             #include <QPushButton>
             #include <QLabel>
             #include <QSqlQuery>
             #include <qscatterseries.h>
             #include <qchartview.h>
             #include <qchartaxis.h>
             #include <qbarcategory.h>
             #include <qbarset.h>
             #include <QListWidget>
             #include <QPrinter>
             #include <QPrintDialog>
             #include <QRadioButton>
             QTCOMMERCIALCHART_USE_NAMESPACE
             Widget::Widget(QWidget *parent)
                 : QWidget(parent)
             {
                 setGeometry(100, 100, 1000, 600);
                 // right panel layout
                 barChartRadioButton = new QRadioButton(tr("Bar chart"));
                 barChartRadioButton->setChecked(true);
                 scatterChartRadioButton = new QRadioButton(tr("Scatter chart"));
                 scatterChartRadioButton->setChecked(false);
                 countrieslist = new QListWidget;
                 countrieslist->setSelectionMode(QAbstractItemView::MultiSelection);
                 yearslist = new QListWidget;
                 yearslist->setSelectionMode(QAbstractItemView::ExtendedSelection);
                 for (int i = 1990; i < 2011; i++)
                     yearslist->addItem(QString("%1").arg(i));
                 QPushButton* refreshButton = new QPushButton(tr("Refresh"));
                 connect(refreshButton, SIGNAL(clicked()), this, SLOT(refreshChart()));
                 QPushButton* printButton = new QPushButton(tr("Print chart"));
                 connect(printButton, SIGNAL(clicked()), this, SLOT(printChart()));
                 QVBoxLayout* rightPanelLayout = new QVBoxLayout;
                 rightPanelLayout->addWidget(barChartRadioButton);
                 rightPanelLayout->addWidget(scatterChartRadioButton);
                 rightPanelLayout->addWidget(countrieslist);
                 rightPanelLayout->addWidget(yearslist);
                 rightPanelLayout->addWidget(refreshButton);
                 rightPanelLayout->addWidget(printButton);
                 rightPanelLayout->setStretch(0, 1);
                 rightPanelLayout->setStretch(1, 0);
                 // main layout
                 chartArea = new QChartView(this);
                 chartArea->setChartTitle("GDP by country");
                 QGridLayout* mainLayout = new QGridLayout;
                 mainLayout->addWidget(chartArea, 0, 0);
                 mainLayout->addLayout(rightPanelLayout, 0, 1);
                 mainLayout->setColumnStretch(0,1);
                 setLayout(mainLayout);
                 // connect to the database
                 db = QSqlDatabase::addDatabase("QSQLITE");
                 db.setDatabaseName("gdpData");
                 if(!db.open())
                 {
                     qDebug() << "could not open database. SQLite db file missing (?)";
                     return;
                 }
                 // get the list of all countires and regions.
                 QSqlQuery query;
                 query.exec("SELECT DISTINCT country FROM gdp2");
                 // add the countries to the country filter
                 while (query.next()) {
                     countrieslist->addItem(query.value(0).toString());
                 }
                 // hide axis X labels
                 QChartAxis* axis = chartArea->axisX();
             //    axis->setLabelsVisible(false);
                 //    newAxis.setLabelsOrientation(QChartAxis::LabelsOrientationSlide);
             }
             Widget::~Widget()
             {
                 //
                 db.close();
             }
             /*!
                 refreshes the chart
             */
             void Widget::refreshChart()
             {
                 chartArea->removeAllSeries();
                 // selected countries items list is not sorted. copy the values to QStringlist and sort them.
                 QStringList selectedCountriesStrings;
                 QList<QListWidgetItem*> selectedCountriesItems = countrieslist->selectedItems();
                 for (int i = 0; i < selectedCountriesItems.size(); i++)
                     selectedCountriesStrings.append(selectedCountriesItems[i]->text());
                 selectedCountriesStrings.sort();
                 QSqlQuery query;
                 // selected years items list is not sorted. copy the values to QList<Integer> and sort them.
                 QList<int> selectedYearsInts;
                 QList<QListWidgetItem*> selectedYearsItems = yearslist->selectedItems();
                 for (int i = 0; i < selectedYearsItems.size(); i++)
                     selectedYearsInts.append(selectedYearsItems[i]->text().toInt());
                 qSort(selectedYearsInts.begin(), selectedYearsInts.end(), qGreater<int>());
                 if (barChartRadioButton->isChecked())
                 {
                     // use the sorted selected coutries list to initialize BarCategory
                     QBarCategory* category = new QBarCategory;
                     for (int i = 0; i < selectedCountriesStrings.size(); i++)
                         *category << selectedCountriesStrings[i];
                     series0 = new QBarChartSeries(category);
                     // prepare the selected counries SQL query
                     QString countriesQuery = "country IN (";
                     for (int i = 0; i < selectedCountriesStrings.size(); i++)
                     {
                         countriesQuery.append("'" + selectedCountriesStrings[i] + "'");
                         if ( i < selectedCountriesStrings.size() - 1)
                             countriesQuery.append(",");
                         else
                             countriesQuery.append(")");
                     }
                     // perform a query for each selected year
                     for (int i = 0; i < selectedYearsInts.size(); i++)
                     {
                         query.exec("SELECT country,gdpvalue FROM gdp2 where year=" + QString("%1").arg(selectedYearsInts[i]) + " AND " + countriesQuery);
-                        QBarSet* barSet = new QBarSet(QString("GDP_%1").arg(selectedYearsInts[i]));
+                        QBarSet* barSet = new QBarSet("Barset" + QString::number(i));
                         //        while (query.next()) {
                         //            qDebug() << query.value(0).toString() << " : " << query.value(1).toString();
                         //        }
                         query.first();
                         // the data for some of the coutries for some years might be missing.
                         // QBarChart needs bars to have same size
                         for (int k = 0; k < selectedCountriesStrings.size(); k++)
                         {
                             if (selectedCountriesStrings[k] == query.value(0).toString())
                             {
                                 *barSet << query.value(1).toReal();
                                 qDebug() << query.value(0).toString() << query.value(1).toReal() << " : " << QString("%1").arg(selectedYearsInts[i]);
                                 query.next();
                             }
                             else
                             {
                                 // data missing, put 0
                                 *barSet << 0.0f;
                                 qDebug() << "Putting 0 for Bosnia" << " : " << QString("%1").arg(selectedYearsInts[i]);
                             }
                         }
                         series0->addBarSet(barSet);
                     }
                     // add the serie to the chart
                     chartArea->addSeries(series0);
                 }
                 else if (scatterChartRadioButton->isChecked())
                 {
                     QString yearsQuery = "year IN (";
                     for (int i = 0; i < selectedYearsInts.size(); i++)
                     {
                         yearsQuery.append("'" + QString("%1").arg(selectedYearsInts[i]) + "'");
                         if ( i < selectedYearsInts.size() - 1)
                             yearsQuery.append(",");
                         else
                             yearsQuery.append(")");
                     }
                     // perform a query for each selected year
                     for (int i = 0; i < selectedCountriesStrings.size(); i++)
                     {
                         query.exec("SELECT year,gdpvalue FROM gdp2 where country='" + selectedCountriesStrings[i] + "' AND " + yearsQuery);
                         query.first();
                         QScatterSeries* series = new QScatterSeries;
                         // the data for some of the coutries for some years might be missing.
                         for (int k = 0; k < selectedYearsInts.size(); k++)
                         {
                             if (selectedYearsInts[k] == query.value(0).toInt())
                             {
                                 *series << QPointF(query.value(0).toInt() , query.value(1).toReal());
                                 qDebug() << query.value(0).toString() << query.value(1).toReal() << " : " << QString("%1").arg(selectedYearsInts[k]);
                                 query.next();
                             }
                             else
                             {
                                 // data missing, put 0
                                 *series << QPointF(selectedYearsInts[k] , 0.0f);
                                 qDebug() << "Putting 0 for Bosnia" << " : " << QString("%1").arg(selectedYearsInts[i]) << " " << query.value(0).toInt();
                             }
                         }
             //            chartArea->axisX()->setRange(selectedYearsInts[selectedYearsInts.size() - 1] + 1, selectedYearsInts[0] - 1);
                         chartArea->addSeries(series);
                     }
                     chartArea->axisX()->setRange(selectedYearsInts[selectedYearsInts.size() - 1] + 1, selectedYearsInts[0] - 1);
                 }
             }
             void Widget::printChart()
             {
                 QPrinter printer;
                 //    QPrinter printer(QPrinter::HighResolution);
                 printer.setOutputFormat(QPrinter::PdfFormat);
                 printer.setOrientation(QPrinter::Landscape);
                 printer.setOutputFileName("print.pdf");
                 QPainter painter;
                 painter.begin(&printer);
                 chartArea->render(&painter);
             }

test/chartwidgettest/mainwidget.cpp +11 -37

             #include "mainwidget.h"
             #include "dataseriedialog.h"
             #include "qchartseries.h"
             #include "qpieseries.h"
             #include "qscatterseries.h"
             #include <qlinechartseries.h>
             #include <qbarset.h>
             #include <qbarcategory.h>
             #include <qbarchartseries.h>
             #include <qstackedbarchartseries.h>
             #include <qpercentbarchartseries.h>
             #include <QPushButton>
             #include <QComboBox>
             #include <QSpinBox>
             #include <QCheckBox>
             #include <QGridLayout>
             #include <QHBoxLayout>
             #include <QLabel>
             #include <QSpacerItem>
             #include <QMessageBox>
             #include <cmath>
             #include <QDebug>
             #include <QStandardItemModel>
             QTCOMMERCIALCHART_USE_NAMESPACE
             MainWidget::MainWidget(QWidget *parent) :
                 QWidget(parent)
             {
                 m_chartWidget = new QChartView(this);
                 m_chartWidget->setRubberBandPolicy(QChartView::HorizonalRubberBand);
                 // Grid layout for the controls for configuring the chart widget
                 QGridLayout *grid = new QGridLayout();
                 QPushButton *addSeriesButton = new QPushButton("Add series");
                 connect(addSeriesButton, SIGNAL(clicked()), this, SLOT(addSeries()));
                 grid->addWidget(addSeriesButton, 0, 1);
                 initBackroundCombo(grid);
                 initScaleControls(grid);
                 initThemeCombo(grid);
                 QCheckBox *zoomCheckBox = new QCheckBox("Drag'n drop Zoom");
                 connect(zoomCheckBox, SIGNAL(toggled(bool)), m_chartWidget, SLOT(setZoomEnabled(bool)));
                 zoomCheckBox->setChecked(true);
                 grid->addWidget(zoomCheckBox, grid->rowCount(), 0);
                 // add row with empty label to make all the other rows static
                 grid->addWidget(new QLabel(""), grid->rowCount(), 0);
                 grid->setRowStretch(grid->rowCount() - 1, 1);
                 // Another grid layout as a main layout
                 QGridLayout *mainLayout = new QGridLayout();
                 mainLayout->addLayout(grid, 0, 0);
                 // Init series type specific controls
                 initPieControls();
                 mainLayout->addLayout(m_pieLayout, 2, 0);
                 // Scatter series specific settings
             //    m_scatterLayout = new QGridLayout();
             //    m_scatterLayout->addWidget(new QLabel("scatter"), 0, 0);
             //    m_scatterLayout->setEnabled(false);
             //    mainLayout->addLayout(m_scatterLayout, 1, 0);
                 // Add layouts and the chart widget to the main layout
                 mainLayout->addWidget(m_chartWidget, 0, 1, 3, 1);
                 setLayout(mainLayout);
             }
             // Combo box for selecting the chart's background
             void MainWidget::initBackroundCombo(QGridLayout *grid)
             {
                 QComboBox *backgroundCombo = new QComboBox(this);
                 backgroundCombo->addItem("Color");
                 backgroundCombo->addItem("Gradient");
                 backgroundCombo->addItem("Image");
                 connect(backgroundCombo, SIGNAL(currentIndexChanged(int)),
                         this, SLOT(backgroundChanged(int)));
                 grid->addWidget(new QLabel("Background:"), grid->rowCount(), 0);
                 grid->addWidget(backgroundCombo, grid->rowCount() - 1, 1);
             }
             // Scale related controls (auto-scale vs. manual min-max values)
             void MainWidget::initScaleControls(QGridLayout *grid)
             {
                 m_autoScaleCheck = new QCheckBox("Automatic scaling");
                 connect(m_autoScaleCheck, SIGNAL(stateChanged(int)), this, SLOT(autoScaleChanged(int)));
                 // Allow setting also non-sense values (like -2147483648 and 2147483647)
                 m_xMinSpin = new QSpinBox();
                 m_xMinSpin->setMinimum(INT_MIN);
                 m_xMinSpin->setMaximum(INT_MAX);
                 m_xMinSpin->setValue(0);
                 connect(m_xMinSpin, SIGNAL(valueChanged(int)), this, SLOT(xMinChanged(int)));
                 m_xMaxSpin = new QSpinBox();
                 m_xMaxSpin->setMinimum(INT_MIN);
                 m_xMaxSpin->setMaximum(INT_MAX);
                 m_xMaxSpin->setValue(10);
                 connect(m_xMaxSpin, SIGNAL(valueChanged(int)), this, SLOT(xMaxChanged(int)));
                 m_yMinSpin = new QSpinBox();
                 m_yMinSpin->setMinimum(INT_MIN);
                 m_yMinSpin->setMaximum(INT_MAX);
                 m_yMinSpin->setValue(0);
                 connect(m_yMinSpin, SIGNAL(valueChanged(int)), this, SLOT(yMinChanged(int)));
                 m_yMaxSpin = new QSpinBox();
                 m_yMaxSpin->setMinimum(INT_MIN);
                 m_yMaxSpin->setMaximum(INT_MAX);
                 m_yMaxSpin->setValue(10);
                 connect(m_yMaxSpin, SIGNAL(valueChanged(int)), this, SLOT(yMaxChanged(int)));
                 grid->addWidget(m_autoScaleCheck, grid->rowCount(), 0);
                 grid->addWidget(new QLabel("x min:"), grid->rowCount(), 0);
                 grid->addWidget(m_xMinSpin, grid->rowCount() - 1, 1);
                 grid->addWidget(new QLabel("x max:"), grid->rowCount(), 0);
                 grid->addWidget(m_xMaxSpin, grid->rowCount() - 1, 1);
                 grid->addWidget(new QLabel("y min:"), grid->rowCount(), 0);
                 grid->addWidget(m_yMinSpin, grid->rowCount() - 1, 1);
                 grid->addWidget(new QLabel("y max:"), grid->rowCount(), 0);
                 grid->addWidget(m_yMaxSpin, grid->rowCount() - 1, 1);
                 m_autoScaleCheck->setChecked(true);
             }
             // Combo box for selecting theme
             void MainWidget::initThemeCombo(QGridLayout *grid)
             {
                 QComboBox *chartTheme = new QComboBox();
                 chartTheme->addItem("Default");
                 chartTheme->addItem("Vanilla");
                 chartTheme->addItem("Icy");
                 chartTheme->addItem("Grayscale");
                 chartTheme->addItem("Scientific");
                 chartTheme->addItem("Unnamed1");
                 connect(chartTheme, SIGNAL(currentIndexChanged(int)),
                         this, SLOT(changeChartTheme(int)));
                 grid->addWidget(new QLabel("Chart theme:"), 8, 0);
                 grid->addWidget(chartTheme, 8, 1);
             }
             void MainWidget::initPieControls()
             {
                 // Pie series specific settings
                 // Pie size factory
                 QDoubleSpinBox *pieSizeSpin = new QDoubleSpinBox();
                 pieSizeSpin->setMinimum(LONG_MIN);
                 pieSizeSpin->setMaximum(LONG_MAX);
                 pieSizeSpin->setValue(1.0);
                 pieSizeSpin->setSingleStep(0.1);
                 connect(pieSizeSpin, SIGNAL(valueChanged(double)), this, SLOT(setPieSizeFactor(double)));
                 // Pie position
                 QComboBox *piePosCombo = new QComboBox(this);
                 piePosCombo->addItem("Maximized");
                 piePosCombo->addItem("Top left");
                 piePosCombo->addItem("Top right");
                 piePosCombo->addItem("Bottom left");
                 piePosCombo->addItem("Bottom right");
                 connect(piePosCombo, SIGNAL(currentIndexChanged(int)),
                         this, SLOT(setPiePosition(int)));
                 m_pieLayout = new QGridLayout();
                 m_pieLayout->setEnabled(false);
                 m_pieLayout->addWidget(new QLabel("Pie size factor"), 0, 0);
                 m_pieLayout->addWidget(pieSizeSpin, 0, 1);
                 m_pieLayout->addWidget(new QLabel("Pie position"), 1, 0);
                 m_pieLayout->addWidget(piePosCombo, 1, 1);
             }
             void MainWidget::addSeries()
             {
                 DataSerieDialog dialog(m_defaultSeriesName, this);
                 connect(&dialog, SIGNAL(accepted(QString, int, int, QString, bool)),
                         this, SLOT(addSeries(QString, int, int, QString, bool)));
                 dialog.exec();
             }
             QList<RealList> MainWidget::generateTestData(int columnCount, int rowCount, QString dataCharacteristics)
             {
                 // TODO: dataCharacteristics
                 QList<RealList> testData;
                 for (int j(0); j < columnCount; j++) {
                     QList <qreal> newColumn;
                     for (int i(0); i < rowCount; i++) {
                         if (dataCharacteristics == "Sin") {
                             newColumn.append(abs(sin(3.14159265358979 / 50 * i) * 100));
                         } else if (dataCharacteristics == "Sin + random") {
                             newColumn.append(abs(sin(3.14159265358979 / 50 * i) * 100) + (rand() % 5));
                         } else if (dataCharacteristics == "Random") {
                             newColumn.append(rand() % 5);
                         } else if (dataCharacteristics == "Linear") {
                             //newColumn.append(i * (j + 1.0));
                             // TODO: temporary hack to make pie work; prevent zero values:
                             newColumn.append(i * (j + 1.0) + 0.1);
                         } else { // "constant"
                             newColumn.append((j + 1.0));
                         }
                     }
                     testData.append(newColumn);
                 }
                 return testData;
             }
             QStringList MainWidget::generateLabels(int count)
             {
                 QStringList result;
                 for (int i(0); i < count; i++)
                     result.append("label" + QString::number(i));
                 return result;
             }
             void MainWidget::addSeries(QString seriesName, int columnCount, int rowCount, QString dataCharacteristics, bool labelsEnabled)
             {
                 qDebug() << "addSeries: " << seriesName
                          << " columnCount: " << columnCount
                          << " rowCount: " << rowCount
                          << " dataCharacteristics: " << dataCharacteristics
                          << " labels enabled: " << labelsEnabled;
                 m_defaultSeriesName = seriesName;
                 QList<RealList> data = generateTestData(columnCount, rowCount, dataCharacteristics);
                 // Line series and scatter series use similar data
                 if (seriesName.contains("line", Qt::CaseInsensitive)) {
                     for (int j(0); j < data.count(); j ++) {
                         QList<qreal> column = data.at(j);
                         QLineChartSeries *series = new QLineChartSeries();
                         for (int i(0); i < column.count(); i++) {
                             series->add(i, column.at(i));
                         }
                         m_chartWidget->addSeries(series);
                         setCurrentSeries(series);
                     }
                 } else if (seriesName.contains("scatter", Qt::CaseInsensitive)) {
                     for (int j(0); j < data.count(); j++) {
                         QList<qreal> column = data.at(j);
                         QScatterSeries *series = new QScatterSeries();
                         for (int i(0); i < column.count(); i++) {
                            (*series) << QPointF(i, column.at(i));
                         }
                         m_chartWidget->addSeries(series);
                         setCurrentSeries(series);
                     }
                 } else if (seriesName.contains("pie", Qt::CaseInsensitive)) {
                     QStringList labels = generateLabels(rowCount);
                     for (int j(0); j < data.count(); j++) {
                         QPieSeries *series = new QPieSeries();
                         QList<qreal> column = data.at(j);
                         for (int i(0); i < column.count(); i++) {
                             series->add(column.at(i), labels.at(i));
                         }
                         m_chartWidget->addSeries(series);
                         setCurrentSeries(series);
                     }
-                } else if (seriesName == "Bar") {
+                } else if (seriesName == "Bar"
+                           || seriesName == "Stacked bar"
+                           || seriesName == "Percent bar") {
                     // TODO: replace QBarCategory with QStringList?
                     QBarCategory *category = new QBarCategory;
                     QStringList labels = generateLabels(rowCount);
                     foreach(QString label, labels)
                         *category << label;
-                    QBarChartSeries* series = new QBarChartSeries(category, this);
+                    QBarChartSeries* series = 0;
+                    if (seriesName == "Bar")
+                        series = new QBarChartSeries(category, this);
+                    else if (seriesName == "Stacked bar")
+                        series = new QStackedBarChartSeries(category, this);
+                    else
+                        series = new QPercentBarChartSeries(category, this);
                     for (int j(0); j < data.count(); j++) {
                         QList<qreal> column = data.at(j);
-                        QBarSet *set = new QBarSet;
+                        QBarSet *set = new QBarSet("set" + QString::number(j));
-                        for (int i(0); i < column.count(); i++) {
-                            *set << column.at(i);
-                        series->addBarSet(set);
-                    m_chartWidget->addSeries(series);
-                    setCurrentSeries(series);
-                } else if (seriesName == "Stacked bar") {
-                    QBarCategory *category = new QBarCategory;
-                    QStringList labels = generateLabels(rowCount);
-                    foreach(QString label, labels)
-                        *category << label;
-                    QStackedBarChartSeries* series = new QStackedBarChartSeries(category, this);
-                    for (int j(0); j < data.count(); j++) {
-                        QList<qreal> column = data.at(j);
-                        QBarSet *set = new QBarSet;
-                        for (int i(0); i < column.count(); i++) {
-                            *set << column.at(i);
-                        series->addBarSet(set);
-                    m_chartWidget->addSeries(series);
-                    setCurrentSeries(series);
-                } else if (seriesName == "Percent bar") {
-                    QBarCategory *category = new QBarCategory;
-                    QStringList labels = generateLabels(rowCount);
-                    foreach(QString label, labels)
-                        *category << label;
-                    QPercentBarChartSeries* series = new QPercentBarChartSeries(category, this);
-                    for (int j(0); j < data.count(); j++) {
-                        QList<qreal> column = data.at(j);
-                        QBarSet *set = new QBarSet;
                         for (int i(0); i < column.count(); i++) {
                             *set << column.at(i);
                         }
                         series->addBarSet(set);
                     }
                     m_chartWidget->addSeries(series);
                     setCurrentSeries(series);
                 }
                 // TODO: spline and area
             }
             void MainWidget::setCurrentSeries(QChartSeries *series)
             {
                 if (series) {
                     m_currentSeries = series;
                     switch (m_currentSeries->type()) {
                     case QChartSeries::SeriesTypeLine:
                         break;
                     case QChartSeries::SeriesTypeScatter:
                         break;
                     case QChartSeries::SeriesTypePie:
                         break;
                     case QChartSeries::SeriesTypeBar:
                         qDebug() << "setCurrentSeries (bar)";
                         break;
                     case QChartSeries::SeriesTypeStackedBar:
                         qDebug() << "setCurrentSeries (Stackedbar)";
                         break;
                     case QChartSeries::SeriesTypePercentBar:
                         qDebug() << "setCurrentSeries (Percentbar)";
                         break;
                     default:
                         Q_ASSERT(false);
                         break;
                     }
                 }
             }
             void MainWidget::backgroundChanged(int itemIndex)
             {
                 qDebug() << "backgroundChanged: " << itemIndex;
             }
             void MainWidget::autoScaleChanged(int value)
             {
                 if (value) {
                     // TODO: enable auto scaling
                 } else {
                     // TODO: set scaling manually (and disable auto scaling)
                 }
                 m_xMinSpin->setEnabled(!value);
                 m_xMaxSpin->setEnabled(!value);
                 m_yMinSpin->setEnabled(!value);
                 m_yMaxSpin->setEnabled(!value);
             }
             void MainWidget::xMinChanged(int value)
             {
                 qDebug() << "xMinChanged: " << value;
             }
             void MainWidget::xMaxChanged(int value)
             {
                 qDebug() << "xMaxChanged: " << value;
             }
             void MainWidget::yMinChanged(int value)
             {
                 qDebug() << "yMinChanged: " << value;
             }
             void MainWidget::yMaxChanged(int value)
             {
                 qDebug() << "yMaxChanged: " << value;
             }
             void MainWidget::changeChartTheme(int themeIndex)
             {
                 qDebug() << "changeChartTheme: " << themeIndex;
                 m_chartWidget->setChartTheme((QChart::ChartTheme) themeIndex);
                 //TODO: remove this hack. This is just to make it so that theme change is seen immediately.
                 QSize s = size();
                 s.setWidth(s.width()+1);
                 resize(s);
             }
             void MainWidget::setPieSizeFactor(double size)
             {
                 QPieSeries *pie = qobject_cast<QPieSeries *>(m_currentSeries);
                 if (pie)
                     pie->setSizeFactor(qreal(size));
             }
             void MainWidget::setPiePosition(int position)
             {
                 QPieSeries *pie = qobject_cast<QPieSeries *>(m_currentSeries);
                 if (pie)
                     pie->setPosition((QPieSeries::PiePosition) position);
             }

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