Storing altitude measurements within tree widget node metadata enables dynamic elevation plotting upon user interaction. The following implementation demonstrates chart view integration and synchronized selection handling.

Header Configuration

#include <QChartView>
#include <QValueAxis>
#include <QLineSeries>

QT_CHARTS_USE_NAMESPACE

class MainWindow : public QMainWindow {
private:
    QChart *terrainChart;
    QValueAxis *distanceAxis;
    QValueAxis *elevationAxis;
};

Constructor Setup

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) {
    terrainChart = new QChart();
    ui->elevationView->setChart(terrainChart);
    
    distanceAxis = new QValueAxis();
    distanceAxis->setRange(0, 1000);
    distanceAxis->setTickCount(11);
    distanceAxis->setTitleText("Distance (m)");
    terrainChart->addAxis(distanceAxis, Qt::AlignBottom);
    
    elevationAxis = new QValueAxis();
    elevationAxis->setRange(0, 1000);
    elevationAxis->setTickCount(11);
    elevationAxis->setTitleText("Elevation");
    terrainChart->addAxis(elevationAxis, Qt::AlignLeft);
    
    connect(ui->trackTree, &QTreeWidget::itemSelectionChanged,
            this, &MainWindow::refreshElevationDisplay);
}

Selection Handler Implementation

void MainWindow::refreshElevationDisplay() {
    scene->clearSelection();
    terrainChart->removeAllSeries();
    
    QList<QTreeWidgetItem*> selectedNodes = ui->trackTree->selectedItems();
    QList<QGraphicsItem*> canvasItems = scene->items();
    
    for (QGraphicsItem* canvasItem : canvasItems) {
        for (QTreeWidgetItem* node : selectedNodes) {
            QString nodeKey = node->data(0, ITEMID).toString();
            QString itemKey = canvasItem->data(ITEMID).toString();
            
            if (nodeKey == itemKey) {
                canvasItem->setSelected(true);
                break;
            }
        }
    }
    
    for (QTreeWidgetItem* trackNode : selectedNodes) {
        QString trackId = trackNode->data(0, ITEMID).toString();
        
        if (trackId.startsWith("track")) {
            QLineSeries *profileSeries = new QLineSeries();
            profileSeries->setName(trackNode->text(0));
            terrainChart->addSeries(profileSeries);
            
            profileSeries->attachAxis(distanceAxis);
            profileSeries->attachAxis(elevationAxis);
            
            for (int pointIndex = 0; pointIndex < trackNode->childCount(); ++pointIndex) {
                QString pointData = trackNode->child(pointIndex)->text(0);
                QStringList coordinates = pointData.split(",");
                
                if (coordinates.size() > 2) {
                    double altitude = coordinates[2].toDouble();
                    profileSeries->append(pointIndex, altitude);
                }
            }
        }
    }
}