graphmodifier.cpp Example File

bars/graphmodifier.cpp
 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Data Visualization module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:GPL$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 3 or (at your option) any later version
 ** approved by the KDE Free Qt Foundation. The licenses are as published by
 ** the Free Software Foundation and appearing in the file LICENSE.GPL3
 ** included in the packaging of this file. Please review the following
 ** information to ensure the GNU General Public License requirements will
 ** be met: https://www.gnu.org/licenses/gpl-3.0.html.
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "graphmodifier.h"
 #include <QtDataVisualization/qcategory3daxis.h>
 #include <QtDataVisualization/qvalue3daxis.h>
 #include <QtDataVisualization/qbardataproxy.h>
 #include <QtDataVisualization/q3dscene.h>
 #include <QtDataVisualization/q3dcamera.h>
 #include <QtDataVisualization/qbar3dseries.h>
 #include <QtDataVisualization/q3dtheme.h>
 #include <QtCore/QTime>
 #include <QtWidgets/QComboBox>
 #include <QtCore/qmath.h>

 using namespace QtDataVisualization;

 const QString celsiusString = QString(QChar(0xB0)) + "C";

 GraphModifier::GraphModifier(Q3DBars *bargraph)
     : m_graph(bargraph),
       m_xRotation(0.0f),
       m_yRotation(0.0f),
       m_fontSize(30),
       m_segments(4),
       m_subSegments(3),
       m_minval(-20.0f),
       m_maxval(20.0f),
       m_temperatureAxis(new QValue3DAxis),
       m_yearAxis(new QCategory3DAxis),
       m_monthAxis(new QCategory3DAxis),
       m_primarySeries(new QBar3DSeries),
       m_secondarySeries(new QBar3DSeries),
       m_barMesh(QAbstract3DSeries::MeshBevelBar),
       m_smooth(false)
 {
     m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualitySoftMedium);
     m_graph->activeTheme()->setBackgroundEnabled(false);
     m_graph->activeTheme()->setFont(QFont("Times New Roman", m_fontSize));
     m_graph->activeTheme()->setLabelBackgroundEnabled(true);
     m_graph->setMultiSeriesUniform(true);

     m_months << "January" << "February" << "March" << "April" << "May" << "June" << "July" << "August" << "September" << "October" << "November" << "December";
     m_years << "2006" << "2007" << "2008" << "2009" << "2010" << "2011" << "2012" << "2013";

     m_temperatureAxis->setTitle("Average temperature");
     m_temperatureAxis->setSegmentCount(m_segments);
     m_temperatureAxis->setSubSegmentCount(m_subSegments);
     m_temperatureAxis->setRange(m_minval, m_maxval);
     m_temperatureAxis->setLabelFormat(QString(QStringLiteral("%.1f ") + celsiusString));
     m_temperatureAxis->setLabelAutoRotation(30.0f);
     m_temperatureAxis->setTitleVisible(true);

     m_yearAxis->setTitle("Year");
     m_yearAxis->setLabelAutoRotation(30.0f);
     m_yearAxis->setTitleVisible(true);
     m_monthAxis->setTitle("Month");
     m_monthAxis->setLabelAutoRotation(30.0f);
     m_monthAxis->setTitleVisible(true);

     m_graph->setValueAxis(m_temperatureAxis);
     m_graph->setRowAxis(m_yearAxis);
     m_graph->setColumnAxis(m_monthAxis);

     m_primarySeries->setItemLabelFormat(QStringLiteral("Oulu - @colLabel @rowLabel: @valueLabel"));
     m_primarySeries->setMesh(QAbstract3DSeries::MeshBevelBar);
     m_primarySeries->setMeshSmooth(false);

     m_secondarySeries->setItemLabelFormat(QStringLiteral("Helsinki - @colLabel @rowLabel: @valueLabel"));
     m_secondarySeries->setMesh(QAbstract3DSeries::MeshBevelBar);
     m_secondarySeries->setMeshSmooth(false);
     m_secondarySeries->setVisible(false);

     m_graph->addSeries(m_primarySeries);
     m_graph->addSeries(m_secondarySeries);

     changePresetCamera();

     resetTemperatureData();

     // Set up property animations for zooming to the selected bar
     Q3DCamera *camera = m_graph->scene()->activeCamera();
     m_defaultAngleX = camera->xRotation();
     m_defaultAngleY = camera->yRotation();
     m_defaultZoom = camera->zoomLevel();
     m_defaultTarget = camera->target();

     m_animationCameraX.setTargetObject(camera);
     m_animationCameraY.setTargetObject(camera);
     m_animationCameraZoom.setTargetObject(camera);
     m_animationCameraTarget.setTargetObject(camera);

     m_animationCameraX.setPropertyName("xRotation");
     m_animationCameraY.setPropertyName("yRotation");
     m_animationCameraZoom.setPropertyName("zoomLevel");
     m_animationCameraTarget.setPropertyName("target");

     int duration = 1700;
     m_animationCameraX.setDuration(duration);
     m_animationCameraY.setDuration(duration);
     m_animationCameraZoom.setDuration(duration);
     m_animationCameraTarget.setDuration(duration);

     // The zoom always first zooms out above the graph and then zooms in
     qreal zoomOutFraction = 0.3;
     m_animationCameraX.setKeyValueAt(zoomOutFraction, QVariant::fromValue(0.0f));
     m_animationCameraY.setKeyValueAt(zoomOutFraction, QVariant::fromValue(90.0f));
     m_animationCameraZoom.setKeyValueAt(zoomOutFraction, QVariant::fromValue(50.0f));
     m_animationCameraTarget.setKeyValueAt(zoomOutFraction,
                                           QVariant::fromValue(QVector3D(0.0f, 0.0f, 0.0f)));
 }

 GraphModifier::~GraphModifier()
 {
     delete m_graph;
 }

 void GraphModifier::resetTemperatureData()
 {
     // Set up data
     static const float tempOulu[8][12] = {
         {-6.7f, -11.7f, -9.7f, 3.3f, 9.2f, 14.0f, 16.3f, 17.8f, 10.2f, 2.1f, -2.6f, -0.3f},    // 2006
         {-6.8f, -13.3f, 0.2f, 1.5f, 7.9f, 13.4f, 16.1f, 15.5f, 8.2f, 5.4f, -2.6f, -0.8f},      // 2007
         {-4.2f, -4.0f, -4.6f, 1.9f, 7.3f, 12.5f, 15.0f, 12.8f, 7.6f, 5.1f, -0.9f, -1.3f},      // 2008
         {-7.8f, -8.8f, -4.2f, 0.7f, 9.3f, 13.2f, 15.8f, 15.5f, 11.2f, 0.6f, 0.7f, -8.4f},      // 2009
         {-14.4f, -12.1f, -7.0f, 2.3f, 11.0f, 12.6f, 18.8f, 13.8f, 9.4f, 3.9f, -5.6f, -13.0f},  // 2010
         {-9.0f, -15.2f, -3.8f, 2.6f, 8.3f, 15.9f, 18.6f, 14.9f, 11.1f, 5.3f, 1.8f, -0.2f},     // 2011
         {-8.7f, -11.3f, -2.3f, 0.4f, 7.5f, 12.2f, 16.4f, 14.1f, 9.2f, 3.1f, 0.3f, -12.1f},     // 2012
         {-7.9f, -5.3f, -9.1f, 0.8f, 11.6f, 16.6f, 15.9f, 15.5f, 11.2f, 4.0f, 0.1f, -1.9f}      // 2013
     };

     static const float tempHelsinki[8][12] = {
         {-3.7f, -7.8f, -5.4f, 3.4f, 10.7f, 15.4f, 18.6f, 18.7f, 14.3f, 8.5f, 2.9f, 4.1f},      // 2006
         {-1.2f, -7.5f, 3.1f, 5.5f, 10.3f, 15.9f, 17.4f, 17.9f, 11.2f, 7.3f, 1.1f, 0.5f},       // 2007
         {-0.6f, 1.2f, 0.2f, 6.3f, 10.2f, 13.8f, 18.1f, 15.1f, 10.1f, 9.4f, 2.5f, 0.4f},        // 2008
         {-2.9f, -3.5f, -0.9f, 4.7f, 10.9f, 14.0f, 17.4f, 16.8f, 13.2f, 4.1f, 2.6f, -2.3f},     // 2009
         {-10.2f, -8.0f, -1.9f, 6.6f, 11.3f, 14.5f, 21.0f, 18.8f, 12.6f, 6.1f, -0.5f, -7.3f},   // 2010
         {-4.4f, -9.1f, -2.0f, 5.5f, 9.9f, 15.6f, 20.8f, 17.8f, 13.4f, 8.9f, 3.6f, 1.5f},       // 2011
         {-3.5f, -3.2f, -0.7f, 4.0f, 11.1f, 13.4f, 17.3f, 15.8f, 13.1f, 6.4f, 4.1f, -5.1f},     // 2012
         {-4.8f, -1.8f, -5.0f, 2.9f, 12.8f, 17.2f, 18.0f, 17.1f, 12.5f, 7.5f, 4.5f, 2.3f}       // 2013
     };

     // Create data arrays
     QBarDataArray *dataSet = new QBarDataArray;
     QBarDataArray *dataSet2 = new QBarDataArray;
     QBarDataRow *dataRow;
     QBarDataRow *dataRow2;

     dataSet->reserve(m_years.size());
     for (int year = 0; year < m_years.size(); year++) {
         // Create a data row
         dataRow = new QBarDataRow(m_months.size());
         dataRow2 = new QBarDataRow(m_months.size());
         for (int month = 0; month < m_months.size(); month++) {
             // Add data to the row
             (*dataRow)[month].setValue(tempOulu[year][month]);
             (*dataRow2)[month].setValue(tempHelsinki[year][month]);
         }
         // Add the row to the set
         dataSet->append(dataRow);
         dataSet2->append(dataRow2);
     }

     // Add data to the data proxy (the data proxy assumes ownership of it)
     m_primarySeries->dataProxy()->resetArray(dataSet, m_years, m_months);
     m_secondarySeries->dataProxy()->resetArray(dataSet2, m_years, m_months);
 }

 void GraphModifier::changeRange(int range)
 {
     if (range >= m_years.count())
         m_yearAxis->setRange(0, m_years.count() - 1);
     else
         m_yearAxis->setRange(range, range);
 }

 void GraphModifier::changeStyle(int style)
 {
     QComboBox *comboBox = qobject_cast<QComboBox *>(sender());
     if (comboBox) {
         m_barMesh = QAbstract3DSeries::Mesh(comboBox->itemData(style).toInt());
         m_primarySeries->setMesh(m_barMesh);
         m_secondarySeries->setMesh(m_barMesh);
     }
 }

 void GraphModifier::changePresetCamera()
 {
     m_animationCameraX.stop();
     m_animationCameraY.stop();
     m_animationCameraZoom.stop();
     m_animationCameraTarget.stop();

     // Restore camera target in case animation has changed it
     m_graph->scene()->activeCamera()->setTarget(QVector3D(0.0f, 0.0f, 0.0f));

     static int preset = Q3DCamera::CameraPresetFront;

     m_graph->scene()->activeCamera()->setCameraPreset((Q3DCamera::CameraPreset)preset);

     if (++preset > Q3DCamera::CameraPresetDirectlyBelow)
         preset = Q3DCamera::CameraPresetFrontLow;
 }

 void GraphModifier::changeTheme(int theme)
 {
     Q3DTheme *currentTheme = m_graph->activeTheme();
     currentTheme->setType(Q3DTheme::Theme(theme));
     emit backgroundEnabledChanged(currentTheme->isBackgroundEnabled());
     emit gridEnabledChanged(currentTheme->isGridEnabled());
     emit fontChanged(currentTheme->font());
     emit fontSizeChanged(currentTheme->font().pointSize());
 }

 void GraphModifier::changeLabelBackground()
 {
     m_graph->activeTheme()->setLabelBackgroundEnabled(!m_graph->activeTheme()->isLabelBackgroundEnabled());
 }

 void GraphModifier::changeSelectionMode(int selectionMode)
 {
     QComboBox *comboBox = qobject_cast<QComboBox *>(sender());
     if (comboBox) {
         int flags = comboBox->itemData(selectionMode).toInt();
         m_graph->setSelectionMode(QAbstract3DGraph::SelectionFlags(flags));
     }
 }

 void GraphModifier::changeFont(const QFont &font)
 {
     QFont newFont = font;
     m_graph->activeTheme()->setFont(newFont);
 }

 void GraphModifier::changeFontSize(int fontsize)
 {
     m_fontSize = fontsize;
     QFont font = m_graph->activeTheme()->font();
     font.setPointSize(m_fontSize);
     m_graph->activeTheme()->setFont(font);
 }

 void GraphModifier::shadowQualityUpdatedByVisual(QAbstract3DGraph::ShadowQuality sq)
 {
     int quality = int(sq);
     // Updates the UI component to show correct shadow quality
     emit shadowQualityChanged(quality);
 }

 void GraphModifier::changeLabelRotation(int rotation)
 {
     m_temperatureAxis->setLabelAutoRotation(float(rotation));
     m_monthAxis->setLabelAutoRotation(float(rotation));
     m_yearAxis->setLabelAutoRotation(float(rotation));
 }

 void GraphModifier::setAxisTitleVisibility(bool enabled)
 {
     m_temperatureAxis->setTitleVisible(enabled);
     m_monthAxis->setTitleVisible(enabled);
     m_yearAxis->setTitleVisible(enabled);
 }

 void GraphModifier::setAxisTitleFixed(bool enabled)
 {
     m_temperatureAxis->setTitleFixed(enabled);
     m_monthAxis->setTitleFixed(enabled);
     m_yearAxis->setTitleFixed(enabled);
 }

 void GraphModifier::zoomToSelectedBar()
 {
     m_animationCameraX.stop();
     m_animationCameraY.stop();
     m_animationCameraZoom.stop();
     m_animationCameraTarget.stop();

     Q3DCamera *camera = m_graph->scene()->activeCamera();
     float currentX = camera->xRotation();
     float currentY = camera->yRotation();
     float currentZoom = camera->zoomLevel();
     QVector3D currentTarget = camera->target();

     m_animationCameraX.setStartValue(QVariant::fromValue(currentX));
     m_animationCameraY.setStartValue(QVariant::fromValue(currentY));
     m_animationCameraZoom.setStartValue(QVariant::fromValue(currentZoom));
     m_animationCameraTarget.setStartValue(QVariant::fromValue(currentTarget));

     QPoint selectedBar = m_graph->selectedSeries()
             ? m_graph->selectedSeries()->selectedBar()
             : QBar3DSeries::invalidSelectionPosition();

     if (selectedBar != QBar3DSeries::invalidSelectionPosition()) {
         // Normalize selected bar position within axis range to determine target coordinates
         QVector3D endTarget;
         float xMin = m_graph->columnAxis()->min();
         float xRange = m_graph->columnAxis()->max() - xMin;
         float zMin = m_graph->rowAxis()->min();
         float zRange = m_graph->rowAxis()->max() - zMin;
         endTarget.setX((selectedBar.y() - xMin) / xRange * 2.0f - 1.0f);
         endTarget.setZ((selectedBar.x() - zMin) / zRange * 2.0f - 1.0f);

         // Rotate the camera so that it always points approximately to the graph center
         qreal endAngleX = 90.0 - qRadiansToDegrees(qAtan(qreal(endTarget.z() / endTarget.x())));
         if (endTarget.x() > 0.0f)
             endAngleX -= 180.0f;
         float barValue = m_graph->selectedSeries()->dataProxy()->itemAt(selectedBar.x(),
                                                                         selectedBar.y())->value();
         float endAngleY = barValue >= 0.0f ? 30.0f : -30.0f;
         if (m_graph->valueAxis()->reversed())
             endAngleY *= -1.0f;

         m_animationCameraX.setEndValue(QVariant::fromValue(float(endAngleX)));
         m_animationCameraY.setEndValue(QVariant::fromValue(endAngleY));
         m_animationCameraZoom.setEndValue(QVariant::fromValue(250));
         m_animationCameraTarget.setEndValue(QVariant::fromValue(endTarget));
     } else {
         // No selected bar, so return to the default view
         m_animationCameraX.setEndValue(QVariant::fromValue(m_defaultAngleX));
         m_animationCameraY.setEndValue(QVariant::fromValue(m_defaultAngleY));
         m_animationCameraZoom.setEndValue(QVariant::fromValue(m_defaultZoom));
         m_animationCameraTarget.setEndValue(QVariant::fromValue(m_defaultTarget));
     }

     m_animationCameraX.start();
     m_animationCameraY.start();
     m_animationCameraZoom.start();
     m_animationCameraTarget.start();
 }

 void GraphModifier::changeShadowQuality(int quality)
 {
     QAbstract3DGraph::ShadowQuality sq = QAbstract3DGraph::ShadowQuality(quality);
     m_graph->setShadowQuality(sq);
     emit shadowQualityChanged(quality);
 }

 void GraphModifier::rotateX(int rotation)
 {
     m_xRotation = rotation;
     m_graph->scene()->activeCamera()->setCameraPosition(m_xRotation, m_yRotation);
 }

 void GraphModifier::rotateY(int rotation)
 {
     m_yRotation = rotation;
     m_graph->scene()->activeCamera()->setCameraPosition(m_xRotation, m_yRotation);
 }

 void GraphModifier::setBackgroundEnabled(int enabled)
 {
     m_graph->activeTheme()->setBackgroundEnabled(bool(enabled));
 }

 void GraphModifier::setGridEnabled(int enabled)
 {
     m_graph->activeTheme()->setGridEnabled(bool(enabled));
 }

 void GraphModifier::setSmoothBars(int smooth)
 {
     m_smooth = bool(smooth);
     m_primarySeries->setMeshSmooth(m_smooth);
     m_secondarySeries->setMeshSmooth(m_smooth);
 }

 void GraphModifier::setSeriesVisibility(int enabled)
 {
     m_secondarySeries->setVisible(bool(enabled));
 }

 void GraphModifier::setReverseValueAxis(int enabled)
 {
     m_graph->valueAxis()->setReversed(enabled);
 }

 void GraphModifier::setReflection(bool enabled)
 {
     m_graph->setReflection(enabled);
 }