1 files changed, 117 insertions, 0 deletions
diff --git a/examples/datavisualization/graphgallery/rainfalldata.cpp b/examples/datavisualization/graphgallery/rainfalldata.cpp
new file mode 100644
index 00000000..66a2553a
--- /dev/null
+++ b/examples/datavisualization/graphgallery/rainfalldata.cpp
@@ -0,0 +1,117 @@
+// 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]
+}