main.cpp Example File | Qt Charts 5.9

Qt 5.9 | Qt Charts | Candlestick Chart Example | main.cpp Example File

Qt 5.9.9 Reference Documentation

# main.cpp Example File

candlestickchart/main.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the Qt Charts module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:GPL$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** GNU General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU
      ** General Public License version 3 or (at your option) any later version
      ** approved by the KDE Free Qt Foundation. The licenses are as published by
      ** the Free Software Foundation and appearing in the file LICENSE.GPL3
      ** included in the packaging of this file. Please review the following
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      #include <QtCharts/QBarCategoryAxis>
      #include <QtCharts/QCandlestickSeries>
      #include <QtCharts/QChartView>
      #include <QtCharts/QValueAxis>
      #include <QtCore/QDateTime>
      #include <QtWidgets/QApplication>
      #include <QtWidgets/QMainWindow>

      #include "candlestickdatareader.h"

      QT_CHARTS_USE_NAMESPACE

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

          QCandlestickSeries *acmeSeries = new QCandlestickSeries();
          acmeSeries->setName("Acme Ltd");
          acmeSeries->setIncreasingColor(QColor(Qt::green));
          acmeSeries->setDecreasingColor(QColor(Qt::red));

          QFile acmeData(":acme");
          if (!acmeData.open(QIODevice::ReadOnly | QIODevice::Text))
              return 1;

          QStringList categories;

          CandlestickDataReader dataReader(&acmeData);
          while (!dataReader.atEnd()) {
              QCandlestickSet *set = dataReader.readCandlestickSet();
              if (set) {
                  acmeSeries->append(set);
                  categories << QDateTime::fromMSecsSinceEpoch(set->timestamp()).toString("dd");
              }
          }

          QChart *chart = new QChart();
          chart->addSeries(acmeSeries);
          chart->setTitle("Acme Ltd Historical Data (July 2015)");
          chart->setAnimationOptions(QChart::SeriesAnimations);

          chart->createDefaultAxes();

          QBarCategoryAxis *axisX = qobject_cast<QBarCategoryAxis *>(chart->axes(Qt::Horizontal).at(0));
          axisX->setCategories(categories);

          QValueAxis *axisY = qobject_cast<QValueAxis *>(chart->axes(Qt::Vertical).at(0));
          axisY->setMax(axisY->max() * 1.01);
          axisY->setMin(axisY->min() * 0.99);

          chart->legend()->setVisible(true);
          chart->legend()->setAlignment(Qt::AlignBottom);

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

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

          return a.exec();
      }