rainfallgraph.cpp Example File

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#include "rainfallgraph.h" #include <QtDataVisualization/qcategory3daxis.h> #include <QtDataVisualization/qvalue3daxis.h> #include <QtDataVisualization/q3dscene.h> #include <QtDataVisualization/q3dcamera.h> #include <QtDataVisualization/qbar3dseries.h> #include <QtDataVisualization/q3dtheme.h> #include <QtGui/QGuiApplication> #include <QtGui/QFont> #include <QtCore/QDebug> #include <QtCore/QTextStream> #include <QtCore/QFile> using namespace QtDataVisualization; RainfallGraph::RainfallGraph(Q3DBars *rainfall) : m_graph(rainfall) { // 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(); m_proxy = new VariantBarDataProxy; QBar3DSeries *series = new QBar3DSeries(m_proxy); m_graph->addSeries(series); updateYearsList(2000, 2012); // Set up bar specifications; make the bars as wide as they are deep, // and add a small space between the bars m_graph->setBarThickness(1.0f); m_graph->setBarSpacing(QSizeF(1.1, 1.1)); // Set axis labels and titles QStringList months; months << "January" << "February" << "March" << "April" << "May" << "June" << "July" << "August" << "September" << "October" << "November" << "December"; m_graph->rowAxis()->setTitle("Year"); m_graph->columnAxis()->setTitle("Month"); m_graph->valueAxis()->setTitle("rainfall"); m_graph->valueAxis()->setLabelFormat("%d mm"); m_graph->valueAxis()->setSegmentCount(5); m_graph->rowAxis()->setLabels(m_years); m_graph->columnAxis()->setLabels(months); // Set bar type to cylinder series->setMesh(QAbstract3DSeries::MeshCylinder); // Set shadows to medium m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualityMedium); // Set selection mode to bar and column m_graph->setSelectionMode(QAbstract3DGraph::SelectionItemAndColumn | QAbstract3DGraph::SelectionSlice); // Set theme m_graph->activeTheme()->setType(Q3DTheme::ThemeArmyBlue); // Override font in theme m_graph->activeTheme()->setFont(QFont("Century Gothic", 30)); // Override label background for theme m_graph->activeTheme()->setLabelBackgroundEnabled(false); // Set camera position and zoom m_graph->scene()->activeCamera()->setCameraPreset(Q3DCamera::CameraPresetIsometricRightHigh); // Set window title m_graph->setTitle(QStringLiteral("Monthly rainfall in Northern Finland")); // Set reflections on m_graph->setReflection(true); } RainfallGraph::~RainfallGraph() { delete m_mapping; delete m_dataSet; delete m_graph; } void RainfallGraph::start() { addDataSet(); } void RainfallGraph::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(); } void RainfallGraph::addDataSet() { // Create a new variant data set and data item list m_dataSet = new VariantDataSet; VariantDataItemList *itemList = new VariantDataItemList; // Read data from a data file into the data item list QTextStream stream; QFile dataFile(":/data/raindata.txt"); if (dataFile.open(QIODevice::ReadOnly | QIODevice::Text)) { stream.setDevice(&dataFile); while (!stream.atEnd()) { QString line = stream.readLine(); if (line.startsWith("#")) // Ignore comments continue; QStringList strList = line.split(",", QString::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. VariantDataItem *newItem = new VariantDataItem; for (int i = 0; i < 2; i++) newItem->append(strList.at(i).trimmed()); newItem->append(strList.at(2).trimmed().toDouble()); itemList->append(newItem); } } else { qWarning() << "Unable to open data file:" << dataFile.fileName(); } // 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); }

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