グラフギャラリー

m_barsGraph = new Q3DBars();

m_barsWidget = new QWidget;
auto *hLayout = new QHBoxLayout(m_barsWidget);
m_container = QWidget::createWindowContainer(m_barsGraph, m_barsWidget);
m_barsGraph->resize(minimumGraphSize);
m_container->setMinimumSize(minimumGraphSize);
m_container->setMaximumSize(maximumGraphSize);
m_container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
m_container->setFocusPolicy(Qt::StrongFocus);
hLayout->addWidget(m_container, 1);

auto *vLayout = new QVBoxLayout();
hLayout->addLayout(vLayout);

auto *modifier = new GraphModifier(m_barsGraph, this);

GraphModifier::GraphModifier(Q3DBars *bargraph, QObject *parent) :
      QObject(parent),
      m_graph(bargraph),

m_temperatureAxis(new QValue3DAxis),
m_yearAxis(new QCategory3DAxis),
m_monthAxis(new QCategory3DAxis),
m_primarySeries(new QBar3DSeries),
m_secondarySeries(new QBar3DSeries),
m_celsiusString(u"°C"_s)

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_temperatureAxis->setTitle("Average temperature");
m_temperatureAxis->setSegmentCount(m_segments);
m_temperatureAxis->setSubSegmentCount(m_subSegments);
m_temperatureAxis->setRange(m_minval, m_maxval);
m_temperatureAxis->setLabelFormat(u"%.1f "_s + m_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(u"Oulu - @colLabel @rowLabel: @valueLabel"_s);
m_primarySeries->setMesh(QAbstract3DSeries::MeshBevelBar);
m_primarySeries->setMeshSmooth(false);

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

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

changePresetCamera();

static int preset = Q3DCamera::CameraPresetFront;

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

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

resetTemperatureData();

// Set up data
static const float tempOulu[8][12] = {
    {-7.4f, -2.4f, 0.0f, 3.0f, 8.2f, 11.6f, 14.7f, 15.4f, 11.4f, 4.2f, 2.1f, -2.3f},       // 2015
    {-13.4f, -3.9f, -1.8f, 3.1f, 10.6f, 13.7f, 17.8f, 13.6f, 10.7f, 3.5f, -3.1f, -4.2f},   // 2016
...
auto *dataSet = new QBarDataArray;
auto *dataSet2 = new QBarDataArray;

dataSet->reserve(m_years.size());
for (qsizetype year = 0; year < m_years.size(); ++year) {
    // Create a data row
    auto *dataRow = new QBarDataRow(m_months.size());
    auto *dataRow2 = new QBarDataRow(m_months.size());
    for (qsizetype 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);

auto *rotationSliderX = new QSlider(Qt::Horizontal, m_barsWidget);
rotationSliderX->setTickInterval(30);
rotationSliderX->setTickPosition(QSlider::TicksBelow);
rotationSliderX->setMinimum(-180);
rotationSliderX->setValue(0);
rotationSliderX->setMaximum(180);

vLayout->addWidget(new QLabel(u"Rotate horizontally"_s));
vLayout->addWidget(rotationSliderX, 0, Qt::AlignTop);

QObject::connect(rotationSliderX, &QSlider::valueChanged, modifier, &GraphModifier::rotateX);

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

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)));

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);
...
m_animationCameraTarget.setEndValue(QVariant::fromValue(endTarget));

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;

using VariantDataItem = QVariantList;
using VariantDataItemList = QList<VariantDataItem *>;
...

void clear();

int addItem(VariantDataItem *item);
int addItems(VariantDataItemList *itemList);

const VariantDataItemList &itemList() const;

Q_SIGNALS:
void itemsAdded(int index, int count);
void dataCleared();

class VariantBarDataProxy : public QBarDataProxy
...

// Doesn't gain ownership of the dataset, but does connect to it to listen for data changes.
void setDataSet(VariantDataSet *newSet);
VariantDataSet *dataSet();

// Map key (row, column, value) to value index in data item (VariantItem).
// Doesn't gain ownership of mapping, but does connect to it to listen for mapping changes.
// Modifying mapping that is set to proxy will trigger dataset re-resolving.
void setMapping(VariantBarDataMapping *mapping);
VariantBarDataMapping *mapping();

void VariantBarDataProxy::resolveDataSet()
{
    // If we have no data or mapping, or the categories are not defined, simply clear the array
    if (m_dataSet.isNull() || m_mapping.isNull() || !m_mapping->rowCategories().size()
            || !m_mapping->columnCategories().size()) {
        resetArray(nullptr);
        return;
    }
    const VariantDataItemList &itemList = m_dataSet->itemList();

    int rowIndex = m_mapping->rowIndex();
    int columnIndex = m_mapping->columnIndex();
    int valueIndex = m_mapping->valueIndex();
    const QStringList &rowList = m_mapping->rowCategories();
    const QStringList &columnList = m_mapping->columnCategories();

    // Sort values into rows and columns
    using ColumnValueMap = QHash<QString, float>;
    QHash <QString, ColumnValueMap> itemValueMap;
    for (const VariantDataItem *item : itemList) {
        itemValueMap[item->at(rowIndex).toString()][item->at(columnIndex).toString()]
                = item->at(valueIndex).toReal();
    }

    // Create a new data array in format the parent class understands
    auto *newProxyArray = new QBarDataArray;
    for (const QString &rowKey : rowList) {
        auto *newProxyRow = new QBarDataRow(columnList.size());
        for (qsizetype i = 0; i < columnList.size(); ++i)
            (*newProxyRow)[i].setValue(itemValueMap[rowKey][columnList.at(i)]);
        newProxyArray->append(newProxyRow);
    }

    // Finally, reset the data array in the parent class
    resetArray(newProxyArray);
}

Q_PROPERTY(int rowIndex READ rowIndex WRITE setRowIndex NOTIFY rowIndexChanged)
Q_PROPERTY(int columnIndex READ columnIndex WRITE setColumnIndex NOTIFY columnIndexChanged)
Q_PROPERTY(int valueIndex READ valueIndex WRITE setValueIndex NOTIFY valueIndexChanged)
Q_PROPERTY(QStringList rowCategories READ rowCategories WRITE setRowCategories NOTIFY rowCategoriesChanged)
Q_PROPERTY(QStringList columnCategories READ columnCategories WRITE setColumnCategories NOTIFY columnCategoriesChanged)
...

explicit VariantBarDataMapping(int rowIndex, int columnIndex, int valueIndex,
                               const QStringList &rowCategories,
                               const QStringList &columnCategories);
...

void remap(int rowIndex, int columnIndex, int valueIndex,
           const QStringList &rowCategories,
           const QStringList &columnCategories);
...

void mappingChanged();

m_proxy = new VariantBarDataProxy;
m_series = new QBar3DSeries(m_proxy);

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();
    }
    ...

// 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);

QBar3DSeries *customSeries() { return m_series; }

m_graph->activeTheme()->setType(Q3DTheme::ThemeStoneMoss);
m_graph->setShadowQuality(QAbstract3DGraph::ShadowQualitySoftHigh);
m_graph->scene()->activeCamera()->setCameraPreset(Q3DCamera::CameraPresetFront);
m_graph->scene()->activeCamera()->setZoomLevel(80.f);

auto *proxy = new QScatterDataProxy;
auto *series = new QScatter3DSeries(proxy);
series->setItemLabelFormat(u"@xTitle: @xLabel @yTitle: @yLabel @zTitle: @zLabel"_s);
series->setMeshSmooth(m_smooth);
m_graph->addSeries(series);

addData();

m_graph->axisX()->setTitle("X");
m_graph->axisY()->setTitle("Y");
m_graph->axisZ()->setTitle("Z");

auto *dataArray = new QScatterDataArray;
dataArray->reserve(m_itemCount);
    ...
const float limit = qSqrt(m_itemCount) / 2.0f;
for (int i = -limit; i < limit; ++i) {
    for (int j = -limit; j < limit; ++j) {
        const float x = float(i) + 0.5f;
        const float y = qCos(qDegreesToRadians(float(i * j) / m_curveDivider));
        const float z = float(j) + 0.5f;
        dataArray->append(QScatterDataItem({x, y, z}));
    }
}

m_graph->seriesList().at(0)->dataProxy()->resetArray(dataArray);

m_inputHandler(new AxesInputHandler(scatter))

// Give ownership of the handler to the graph and make it the active handler
m_graph->setActiveInputHandler(m_inputHandler);

// Give our axes to the input handler
m_inputHandler->setAxes(m_graph->axisX(), m_graph->axisZ(), m_graph->axisY());

class AxesInputHandler : public Q3DInputHandler

void AxesInputHandler::mousePressEvent(QMouseEvent *event, const QPoint &mousePos)
{
    Q3DInputHandler::mousePressEvent(event, mousePos);
    if (Qt::LeftButton == event->button())
        m_mousePressed = true;
}

void AxesInputHandler::mouseReleaseEvent(QMouseEvent *event, const QPoint &mousePos)
{
    Q3DInputHandler::mouseReleaseEvent(event, mousePos);
    m_mousePressed = false;
    m_state = StateNormal;
}

void AxesInputHandler::mouseMoveEvent(QMouseEvent *event, const QPoint &mousePos)
{
    // Check if we're trying to drag axis label
    if (m_mousePressed && m_state != StateNormal) {
        setPreviousInputPos(inputPosition());
        setInputPosition(mousePos);
        handleAxisDragging();
    } else {
        Q3DInputHandler::mouseMoveEvent(event, mousePos);
    }
}

// Connect to the item selection signal from graph
connect(graph, &QAbstract3DGraph::selectedElementChanged, this,
        &AxesInputHandler::handleElementSelected);

switch (type) {
case QAbstract3DGraph::ElementAxisXLabel:
    m_state = StateDraggingX;
    break;
case QAbstract3DGraph::ElementAxisYLabel:
    m_state = StateDraggingY;
    break;
case QAbstract3DGraph::ElementAxisZLabel:
    m_state = StateDraggingZ;
    break;
default:
    m_state = StateNormal;
    break;
}

// Check if we're trying to drag axis label
if (m_mousePressed && m_state != StateNormal) {

// Get scene orientation from active camera
float xRotation = scene()->activeCamera()->xRotation();
float yRotation = scene()->activeCamera()->yRotation();

// Calculate directional drag multipliers based on rotation
float xMulX = qCos(qDegreesToRadians(xRotation));
float xMulY = qSin(qDegreesToRadians(xRotation));
float zMulX = qSin(qDegreesToRadians(xRotation));
float zMulY = qCos(qDegreesToRadians(xRotation));

// Get the drag amount
QPoint move = inputPosition() - previousInputPos();

// Flip the effect of y movement if we're viewing from below
float yMove = (yRotation < 0) ? -move.y() : move.y();

// Adjust axes
switch (m_state) {
case StateDraggingX:
    distance = (move.x() * xMulX - yMove * xMulY) / m_speedModifier;
    m_axisX->setRange(m_axisX->min() - distance, m_axisX->max() - distance);
    break;
case StateDraggingZ:
    distance = (move.x() * zMulX + yMove * zMulY) / m_speedModifier;
    m_axisZ->setRange(m_axisZ->min() + distance, m_axisZ->max() + distance);
    break;
case StateDraggingY:
    distance = move.y() / m_speedModifier; // No need to use adjusted y move here
    m_axisY->setRange(m_axisY->min() + distance, m_axisY->max() + distance);
    break;
default:
    break;
}

inline void setDragSpeedModifier(float modifier) { m_speedModifier = modifier; }

m_sqrtSinProxy = new QSurfaceDataProxy();
m_sqrtSinSeries = new QSurface3DSeries(m_sqrtSinProxy);

auto *dataArray = new QSurfaceDataArray;
dataArray->reserve(sampleCountZ);
for (int i = 0 ; i < sampleCountZ ; ++i) {
    auto *newRow = new QSurfaceDataRow;
    newRow->reserve(sampleCountX);
    // Keep values within range bounds, since just adding step can cause minor drift due
    // to the rounding errors.
    float z = qMin(sampleMax, (i * stepZ + sampleMin));
    for (int j = 0; j < sampleCountX; ++j) {
        float x = qMin(sampleMax, (j * stepX + sampleMin));
        float R = qSqrt(z * z + x * x) + 0.01f;
        float y = (qSin(R) / R + 0.24f) * 1.61f;
        newRow->append(QSurfaceDataItem({x, y, z}));
    }
    dataArray->append(newRow);
}

m_sqrtSinProxy->resetArray(dataArray);

// Create the first surface layer
QImage heightMapImageOne(":/data/layer_1.png");
m_heightMapProxyOne = new QHeightMapSurfaceDataProxy(heightMapImageOne);
m_heightMapSeriesOne = new QSurface3DSeries(m_heightMapProxyOne);
m_heightMapSeriesOne->setItemLabelFormat(u"(@xLabel, @zLabel): @yLabel"_s);
m_heightMapProxyOne->setValueRanges(34.f, 40.f, 18.f, 24.f);

// Value used to encode height data as RGB value on PNG file
const float packingFactor = 11983.f;

QImage heightMapImage(file);
uchar *bits = heightMapImage.bits();
int imageHeight = heightMapImage.height();
int imageWidth = heightMapImage.width();
int widthBits = imageWidth * 4;
float stepX = width / float(imageWidth);
float stepZ = height / float(imageHeight);

auto *dataArray = new QSurfaceDataArray;
dataArray->reserve(imageHeight);
for (int i = 0; i < imageHeight; ++i) {
    int p = i * widthBits;
    float z = height - float(i) * stepZ;
    auto *newRow = new QSurfaceDataRow;
    newRow->reserve(imageWidth);
    for (int j = 0; j < imageWidth; ++j) {
        uchar aa = bits[p + 0];
        uchar rr = bits[p + 1];
        uchar gg = bits[p + 2];
        uint color = uint((gg << 16) + (rr << 8) + aa);
        float y = float(color) / packingFactor;
        newRow->append(QSurfaceDataItem({float(j) * stepX, y, z}));
        p += 4;
    }
    dataArray->append(newRow);
}

dataProxy()->resetArray(dataArray);

m_sqrtSinSeries->setDrawMode(QSurface3DSeries::DrawSurfaceAndWireframe);
m_sqrtSinSeries->setFlatShadingEnabled(true);

m_graph->axisX()->setLabelFormat("%.2f");
m_graph->axisZ()->setLabelFormat("%.2f");
m_graph->axisX()->setRange(sampleMin, sampleMax);
m_graph->axisY()->setRange(0.f, 2.f);
m_graph->axisZ()->setRange(sampleMin, sampleMax);
m_graph->axisX()->setLabelAutoRotation(30.f);
m_graph->axisY()->setLabelAutoRotation(90.f);
m_graph->axisZ()->setLabelAutoRotation(30.f);

m_graph->removeSeries(m_heightMapSeriesOne);
m_graph->removeSeries(m_heightMapSeriesTwo);
m_graph->removeSeries(m_heightMapSeriesThree);
m_graph->removeSeries(m_topography);
m_graph->removeSeries(m_highlight);

m_graph->addSeries(m_sqrtSinSeries);

m_graph->axisY()->setAutoAdjustRange(true);

m_graph->setActiveInputHandler(m_customInputHandler);

void toggleModeNone() { m_graph->setSelectionMode(QAbstract3DGraph::SelectionNone); }
void toggleModeItem() { m_graph->setSelectionMode(QAbstract3DGraph::SelectionItem); }
void toggleModeSliceRow() { m_graph->setSelectionMode(QAbstract3DGraph::SelectionItemAndRow
                                                      | QAbstract3DGraph::SelectionSlice
                                                      | QAbstract3DGraph::SelectionMultiSeries); }
void toggleModeSliceColumn() { m_graph->setSelectionMode(QAbstract3DGraph::SelectionItemAndColumn
                                                         | QAbstract3DGraph::SelectionSlice
                                                         | QAbstract3DGraph::SelectionMultiSeries); }

// Reset range sliders for Sqrt & Sin
m_rangeMinX = sampleMin;
m_rangeMinZ = sampleMin;
m_stepX = (sampleMax - sampleMin) / float(sampleCountX - 1);
m_stepZ = (sampleMax - sampleMin) / float(sampleCountZ - 1);
m_axisMinSliderX->setMinimum(0);
m_axisMinSliderX->setMaximum(sampleCountX - 2);
m_axisMinSliderX->setValue(0);
m_axisMaxSliderX->setMinimum(1);
m_axisMaxSliderX->setMaximum(sampleCountX - 1);
m_axisMaxSliderX->setValue(sampleCountX - 1);
m_axisMinSliderZ->setMinimum(0);
m_axisMinSliderZ->setMaximum(sampleCountZ - 2);
m_axisMinSliderZ->setValue(0);
m_axisMaxSliderZ->setMinimum(1);
m_axisMaxSliderZ->setMaximum(sampleCountZ - 1);
m_axisMaxSliderZ->setValue(sampleCountZ - 1);

void SurfaceGraphModifier::setAxisXRange(float min, float max)
{
    m_graph->axisX()->setRange(min, max);
}

QLinearGradient gr;
gr.setColorAt(0.f, Qt::black);
gr.setColorAt(0.33f, Qt::blue);
gr.setColorAt(0.67f, Qt::red);
gr.setColorAt(1.f, Qt::yellow);

m_sqrtSinSeries->setBaseGradient(gr);
m_sqrtSinSeries->setColorStyle(Q3DTheme::ColorStyleRangeGradient);

set(graphgallery_resource_files
    ...
    "data/oilrig.obj"
    "data/pipe.obj"
    "data/refinery.obj"
    ...
)

qt6_add_resources(graphgallery "graphgallery"
    PREFIX
        "/"
    FILES
        ${graphgallery_resource_files}
)

<RCC>
    <qresource prefix="/">
        ...
        <file>data/refinery.obj</file>
        <file>data/oilrig.obj</file>
        <file>data/pipe.obj</file>
        ...
    </qresource>
</RCC>

QImage color = QImage(2, 2, QImage::Format_RGB32);
color.fill(Qt::red);

QVector3D positionOne = QVector3D(39.f, 77.f, 19.2f);

auto *item = new QCustom3DItem(":/data/oilrig.obj", positionOne,
                               QVector3D(0.025f, 0.025f, 0.025f),
                               QQuaternion::fromAxisAndAngle(0.f, 1.f, 0.f, 45.f),
                               color);

m_graph->addCustomItem(item);

auto *label = new QCustom3DLabel();
label->setText("Oil Rig One");
label->setPosition(positionOneLabel);
label->setScaling(QVector3D(1.f, 1.f, 1.f));
m_graph->addCustomItem(label);

m_graph->removeCustomItemAt(positionOne);

void SurfaceGraphModifier::toggleSurfaceTexture(bool enable)
{
    if (enable)
        m_topography->setTextureFile(":/data/maptexture.jpg");
    else
        m_topography->setTextureFile("");
}

case StateDraggingX:
    distance = (move.x() * xMulX - move.y() * xMulY) * m_speedModifier;
    m_axisXMinValue -= distance;
    m_axisXMaxValue -= distance;
    if (m_axisXMinValue < m_areaMinValue) {
        float dist = m_axisXMaxValue - m_axisXMinValue;
        m_axisXMinValue = m_areaMinValue;
        m_axisXMaxValue = m_axisXMinValue + dist;
    }
    if (m_axisXMaxValue > m_areaMaxValue) {
        float dist = m_axisXMaxValue - m_axisXMinValue;
        m_axisXMaxValue = m_areaMaxValue;
        m_axisXMinValue = m_axisXMaxValue - dist;
    }
    m_axisX->setRange(m_axisXMinValue, m_axisXMaxValue);
    break;

void CustomInputHandler::wheelEvent(QWheelEvent *event)
{
    float delta = float(event->angleDelta().y());

    m_axisXMinValue += delta;
    m_axisXMaxValue -= delta;
    m_axisZMinValue += delta;
    m_axisZMaxValue -= delta;
    checkConstraints();

    float y = (m_axisXMaxValue - m_axisXMinValue) * m_aspectRatio;

    m_axisX->setRange(m_axisXMinValue, m_axisXMaxValue);
    m_axisY->setRange(100.f, y);
    m_axisZ->setRange(m_axisZMinValue, m_axisZMaxValue);
}

if (m_axisXMinValue < m_areaMinValue)
    m_axisXMinValue = m_areaMinValue;
if (m_axisXMaxValue > m_areaMaxValue)
    m_axisXMaxValue = m_areaMaxValue;
// Don't allow too much zoom in
if ((m_axisXMaxValue - m_axisXMinValue) < m_axisXMinRange) {
    float adjust = (m_axisXMinRange - (m_axisXMaxValue - m_axisXMinValue)) / 2.f;
    m_axisXMinValue -= adjust;
    m_axisXMaxValue += adjust;
}

void HighlightSeries::setTopographicSeries(TopographicSeries *series)
{
    m_topographicSeries = series;
    m_srcWidth = m_topographicSeries->dataProxy()->array()->at(0)->size();
    m_srcHeight = m_topographicSeries->dataProxy()->array()->size();

    QObject::connect(m_topographicSeries, &QSurface3DSeries::selectedPointChanged,
                     this, &HighlightSeries::handlePositionChange);
}

void HighlightSeries::handlePositionChange(const QPoint &position)
{
    m_position = position;

    if (position == invalidSelectionPosition()) {
        setVisible(false);
        return;
    }

    int halfWidth = m_width / 2;
    int halfHeight = m_height / 2;

    int startX = position.y() - halfWidth;
    if (startX < 0 )
        startX = 0;
    int endX = position.y() + halfWidth;
    if (endX > (m_srcWidth - 1))
        endX = m_srcWidth - 1;
    int startZ = position.x() - halfHeight;
    if (startZ < 0 )
        startZ = 0;
    int endZ = position.x() + halfHeight;
    if (endZ > (m_srcHeight - 1))
        endZ = m_srcHeight - 1;

    QSurfaceDataProxy *srcProxy = m_topographicSeries->dataProxy();
    const QSurfaceDataArray &srcArray = *srcProxy->array();

    auto *dataArray = new QSurfaceDataArray;
    dataArray->reserve(endZ - startZ);
    for (int i = startZ; i < endZ; ++i) {
        auto *newRow = new QSurfaceDataRow;
        newRow->reserve(endX - startX);
        QSurfaceDataRow *srcRow = srcArray.at(i);
        for (int j = startX; j < endX; ++j) {
            QVector3D pos = srcRow->at(j).position();
            pos.setY(pos.y() + 0.1f);
            newRow->append(QSurfaceDataItem(pos));
        }
        dataArray->append(newRow);
    }

    dataProxy()->resetArray(dataArray);
    setVisible(true);
}

const float darkRedPos = 1.f;
const float redPos = 0.8f;
const float yellowPos = 0.6f;
const float greenPos = 0.4f;
const float darkGreenPos = 0.2f;

QObject::connect(m_graph->axisY(), &QValue3DAxis::maxChanged,
                 m_highlight, &HighlightSeries::handleGradientChange);

void HighlightSeries::handleGradientChange(float value)
{
    float ratio = m_minHeight / value;

    QLinearGradient gr;
    gr.setColorAt(0.f, Qt::black);
    gr.setColorAt(darkGreenPos * ratio, Qt::darkGreen);
    gr.setColorAt(greenPos * ratio, Qt::green);
    gr.setColorAt(yellowPos * ratio, Qt::yellow);
    gr.setColorAt(redPos * ratio, Qt::red);
    gr.setColorAt(darkRedPos * ratio, Qt::darkRed);

    setBaseGradient(gr);
    setColorStyle(Q3DTheme::ColorStyleRangeGradient);
}