Qt 5.7 | Qt Charts | Polar Chart Example | main.cpp Example File

Qt 5.7.1 Reference Documentation

# main.cpp Example File

polarchart/main.cpp

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      ** 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 "chartview.h"
      #include <QtWidgets/QApplication>
      #include <QtWidgets/QMainWindow>
      #include <QtCharts/QScatterSeries>
      #include <QtCharts/QLineSeries>
      #include <QtCharts/QSplineSeries>
      #include <QtCharts/QAreaSeries>
      #include <QtCharts/QValueAxis>
      #include <QtCharts/QPolarChart>
      #include <QtCore/QDebug>

      QT_CHARTS_USE_NAMESPACE

      int main(int argc, char *argv[])
      {
          QApplication a(argc, argv);

          const qreal angularMin = -100;
          const qreal angularMax = 100;

          const qreal radialMin = -100;
          const qreal radialMax = 100;

          QScatterSeries *series1 = new QScatterSeries();
          series1->setName("scatter");
          for (int i = angularMin; i <= angularMax; i += 10)
              series1->append(i, (i / radialMax) * radialMax + 8.0);

          QSplineSeries *series2 = new QSplineSeries();
          series2->setName("spline");
          for (int i = angularMin; i <= angularMax; i += 10)
              series2->append(i, (i / radialMax) * radialMax);

          QLineSeries *series3 = new QLineSeries();
          series3->setName("star outer");
          qreal ad = (angularMax - angularMin) / 8;
          qreal rd = (radialMax - radialMin) / 3 * 1.3;
          series3->append(angularMin, radialMax);
          series3->append(angularMin + ad*1, radialMin + rd);
          series3->append(angularMin + ad*2, radialMax);
          series3->append(angularMin + ad*3, radialMin + rd);
          series3->append(angularMin + ad*4, radialMax);
          series3->append(angularMin + ad*5, radialMin + rd);
          series3->append(angularMin + ad*6, radialMax);
          series3->append(angularMin + ad*7, radialMin + rd);
          series3->append(angularMin + ad*8, radialMax);

          QLineSeries *series4 = new QLineSeries();
          series4->setName("star inner");
          ad = (angularMax - angularMin) / 8;
          rd = (radialMax - radialMin) / 3;
          series4->append(angularMin, radialMax);
          series4->append(angularMin + ad*1, radialMin + rd);
          series4->append(angularMin + ad*2, radialMax);
          series4->append(angularMin + ad*3, radialMin + rd);
          series4->append(angularMin + ad*4, radialMax);
          series4->append(angularMin + ad*5, radialMin + rd);
          series4->append(angularMin + ad*6, radialMax);
          series4->append(angularMin + ad*7, radialMin + rd);
          series4->append(angularMin + ad*8, radialMax);

          QAreaSeries *series5 = new QAreaSeries();
          series5->setName("star area");
          series5->setUpperSeries(series3);
          series5->setLowerSeries(series4);
          series5->setOpacity(0.5);

          QPolarChart *chart = new QPolarChart();
          chart->addSeries(series1);
          chart->addSeries(series2);
          chart->addSeries(series3);
          chart->addSeries(series4);
          chart->addSeries(series5);

          chart->setTitle("Use arrow keys to scroll, +/- to zoom, and space to switch chart type.");

          QValueAxis *angularAxis = new QValueAxis();
          angularAxis->setTickCount(9); // First and last ticks are co-located on 0/360 angle.
          angularAxis->setLabelFormat("%.1f");
          angularAxis->setShadesVisible(true);
          angularAxis->setShadesBrush(QBrush(QColor(249, 249, 255)));
          chart->addAxis(angularAxis, QPolarChart::PolarOrientationAngular);

          QValueAxis *radialAxis = new QValueAxis();
          radialAxis->setTickCount(9);
          radialAxis->setLabelFormat("%d");
          chart->addAxis(radialAxis, QPolarChart::PolarOrientationRadial);

          series1->attachAxis(radialAxis);
          series1->attachAxis(angularAxis);
          series2->attachAxis(radialAxis);
          series2->attachAxis(angularAxis);
          series3->attachAxis(radialAxis);
          series3->attachAxis(angularAxis);
          series4->attachAxis(radialAxis);
          series4->attachAxis(angularAxis);
          series5->attachAxis(radialAxis);
          series5->attachAxis(angularAxis);

          radialAxis->setRange(radialMin, radialMax);
          angularAxis->setRange(angularMin, angularMax);

          ChartView *chartView = new ChartView();
          chartView->setChart(chart);
          chartView->setRenderHint(QPainter::Antialiasing);

          QMainWindow window;
          window.setCentralWidget(chartView);
          window.resize(800, 600);
          window.show();

          return a.exec();
      }