FlightPathGeometry.h

Go to the documentation of this file.

/****************************************************************************
 *
 * (c) 2009-2024 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
 *
 * QGroundControl is licensed according to the terms in the file
 * COPYING.md in the root of the source code directory.
 *
 ****************************************************************************/
 
#pragma once
 
#include <QtCore/QByteArray>
#include <QtCore/QList>
#include <QtCore/QVariant>
#include <QtGui/QVector3D>
#include <QtPositioning/QGeoCoordinate>
#include <QtQmlIntegration/QtQmlIntegration>
#include <QtQuick3D/QQuick3DGeometry>
 
class GeoScene;
 
Q_MOC_INCLUDE("GeoScene.h")
 
 
class FlightPathGeometry : public QQuick3DGeometry
{
    Q_OBJECT
    QML_ELEMENT
    Q_PROPERTY(GeoScene* scene READ scene WRITE setScene NOTIFY sceneChanged)
    Q_PROPERTY(QGeoCoordinate anchorCoordinate READ anchorCoordinate NOTIFY anchorCoordinateChanged)
    Q_PROPERTY(int pointCount READ pointCount NOTIFY pointCountChanged)
 
public:
    explicit FlightPathGeometry(QQuick3DObject* parent = nullptr);
 
    static constexpr int kFloatsPerVertex = 8;  
 
    GeoScene* scene() const { return _scene; }
 
    void setScene(GeoScene* scene);
 
    QGeoCoordinate anchorCoordinate() const { return _points.isEmpty() ? QGeoCoordinate() : _points.first(); }
 
    int pointCount() const { return static_cast<int>(_points.size()); }
 
    Q_INVOKABLE void setPath(const QVariantList& coordinates);
 
    Q_INVOKABLE void appendPoint(const QGeoCoordinate& coordinate);
 
    Q_INVOKABLE void updateLastPoint(const QGeoCoordinate& coordinate);
 
    Q_INVOKABLE void clearPath();
 
signals:
    void sceneChanged();
    void anchorCoordinateChanged();
    void pointCountChanged();
 
private:
    void _rebuild();
    QVector3D _positionFor(const QGeoCoordinate& coordinate) const;
    QVector3D _segmentDirection(qsizetype index) const;
    QVector3D _tangentAt(qsizetype index) const;
    void _writeVertexPair(qsizetype index, const QVector3D& tangent);
    void _growBounds(const QVector3D& position);
 
    GeoScene* _scene = nullptr;
    QList<QGeoCoordinate> _points;
 
    // Incremental mirrors of the GPU buffer so mutations avoid full rebuilds
    QList<QVector3D> _positions;
    QList<QVector3D> _segmentDirections;
    QByteArray _vertexData;
    QVector3D _minBounds;
    QVector3D _maxBounds;
};