rainfallgraph.cpp Example File

customproxy/rainfallgraph.cpp
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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);
}

© 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.