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++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "rainfalldata.h"
++ #include <QtDataVisualization/q3dscene.h>
++ #include <QtDataVisualization/q3dcamera.h>
++ #include <QtDataVisualization/qbar3dseries.h>
++ #include <QtDataVisualization/q3dtheme.h>
++ #include <QtCore/qtextstream.h>
++ #include <QtCore/qfile.h>
++
++ using namespace Qt::StringLiterals;
++
++ RainfallData::RainfallData()
++ {
++ // In data file the months are in numeric format, so create custom list
++ for (int i = 1; i <= 12; ++i)
++ m_numericMonths << QString::number(i);
++
++ m_columnCount = m_numericMonths.size();
++
++ updateYearsList(2010, 2022);
++
++ // Create proxy and series
++ //! [0]
++ m_proxy = new VariantBarDataProxy;
++ m_series = new QBar3DSeries(m_proxy);
++ //! [0]
++
++ m_series->setItemLabelFormat(u"%.1f mm"_s);
++
++ // Create the axes
++ m_rowAxis = new QCategory3DAxis(this);
++ m_colAxis = new QCategory3DAxis(this);
++ m_valueAxis = new QValue3DAxis(this);
++ m_rowAxis->setAutoAdjustRange(true);
++ m_colAxis->setAutoAdjustRange(true);
++ m_valueAxis->setAutoAdjustRange(true);
++
++ // Set axis labels and titles
++ QStringList months{"January", "February", "March", "April",
++ "May", "June", "July", "August", "September", "October",
++ "November","December"};
++ m_rowAxis->setTitle("Year");
++ m_colAxis->setTitle("Month");
++ m_valueAxis->setTitle("rainfall (mm)");
++ m_valueAxis->setSegmentCount(5);
++ m_rowAxis->setLabels(m_years);
++ m_colAxis->setLabels(months);
++ m_rowAxis->setTitleVisible(true);
++ m_colAxis->setTitleVisible(true);
++ m_valueAxis->setTitleVisible(true);
++
++ addDataSet();
++ }
++
++ RainfallData::~RainfallData()
++ {
++ delete m_mapping;
++ delete m_dataSet;
++ delete m_proxy;
++ }
++
++ void RainfallData::updateYearsList(int start, int end)
++ {
++ m_years.clear();
++
++ for (int i = start; i <= end; ++i)
++ m_years << QString::number(i);
++
++ m_rowCount = m_years.size();
++ }
++
++ //! [1]
++ void RainfallData::addDataSet()
++ {
++ // Create a new variant data set and data item list
++ m_dataSet = new VariantDataSet;
++ auto *itemList = new VariantDataItemList;
++
++ // Read data from a data file into the data item list
++ QFile dataFile(":/data/raindata.txt");
++ if (dataFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
++ QTextStream stream(&dataFile);
++ while (!stream.atEnd()) {
++ QString line = stream.readLine();
++ if (line.startsWith('#')) // Ignore comments
++ continue;
++ const auto strList = QStringView{line}.split(',', Qt::SkipEmptyParts);
++ // Each line has three data items: Year, month, and rainfall value
++ if (strList.size() < 3) {
++ qWarning() << "Invalid row read from data:" << line;
++ continue;
++ }
++ // Store year and month as strings, and rainfall value as double
++ // into a variant data item and add the item to the item list.
++ auto *newItem = new VariantDataItem;
++ for (int i = 0; i < 2; ++i)
++ newItem->append(strList.at(i).trimmed().toString());
++ newItem->append(strList.at(2).trimmed().toDouble());
++ itemList->append(newItem);
++ }
++ } else {
++ qWarning() << "Unable to open data file:" << dataFile.fileName();
++ }
++ //! [1]
++
++ //! [2]
++ // Add items to the data set and set it to the proxy
++ m_dataSet->addItems(itemList);
++ m_proxy->setDataSet(m_dataSet);
++
++ // Create new mapping for the data and set it to the proxy
++ m_mapping = new VariantBarDataMapping(0, 1, 2, m_years, m_numericMonths);
++ m_proxy->setMapping(m_mapping);
++ //! [2]
++ }