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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]
}
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