qgs3daxis.h

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/***************************************************************************
  qgs3daxis.h
  --------------------------------------
  Date                 : March 2022
  Copyright            : (C) 2022 by Jean Felder
  Email                : jean dot felder at oslandia dot com
  ***************************************************************************
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
  *   the Free Software Foundation; either version 2 of the License, or     *
  *   (at your option) any later version.                                   *
  *                                                                         *
  ***************************************************************************/
 
#ifndef QGS3DAXIS_H
#define QGS3DAXIS_H
 
#include "qgis_3d.h"
 
#include "qgscoordinatereferencesystem.h"
#include <Qt3DCore/QEntity>
#include <Qt3DExtras/Qt3DWindow>
#include <Qt3DExtras/QText2DEntity>
#include <Qt3DRender/QCamera>
#include <Qt3DRender/QViewport>
#include <Qt3DRender/QPickEvent>
#include <Qt3DRender/QScreenRayCaster>
#include <QVector3D>
#include <QVector2D>
 
#include <Qt3DRender/QLayer>
#include <Qt3DRender/QBuffer>
#include <Qt3DRender/QGeometryRenderer>
 
#include <QtWidgets/QMenu>
 
#define SIP_NO_FILE
 
class QgsCameraController;
class Qgs3DMapSettings;
class Qgs3DMapScene;
 
class _3D_EXPORT Qgs3DAxis : public QObject
{
    Q_OBJECT
  public:
 
    Qgs3DAxis( Qt3DExtras::Qt3DWindow *parentWindow,  Qt3DCore::QEntity *parent3DScene,
               Qgs3DMapScene *mapScene, QgsCameraController *camera, Qgs3DMapSettings *map );
    ~Qgs3DAxis() override;
 
    enum class Mode
    {
      Off = 1, 
      Crs = 2, 
      Cube = 3, 
    };
    Q_ENUM( Mode )
 
    
    Qgs3DAxis::Mode mode() { return mMode; }
 
    void setMode( Qgs3DAxis::Mode axisMode );
 
    void setAxisViewportPosition( int axisViewportSize, Qt::AnchorPoint axisViewportVertPos, Qt::AnchorPoint axisViewportHorizPos );
 
    int axisViewportSize() const { return mAxisViewportSize;}
 
    Qt::AnchorPoint axisViewportHorizontalPosition() const { return mAxisViewportHorizPos;}
 
    Qt::AnchorPoint axisViewportVerticalPosition() const { return mAxisViewportVertPos;}
 
    QVector3D from3dTo2dLabelPosition( const QVector3D &sourcePos,
                                       Qt3DRender::QCamera *sourceCamera, Qt3DRender::QViewport *sourceViewport,
                                       Qt3DRender::QCamera *destCamera, Qt3DRender::QViewport *destViewport,
                                       const QSize &destSize );
 
  private slots:
 
    void onCameraUpdate( );
    void onAxisViewportSizeUpdate( int val = 0 );
 
    // axis picking and menu
    void onTouchedByRay( const Qt3DRender::QAbstractRayCaster::Hits &hits );
    void onAxisModeChanged( Qgs3DAxis::Mode mode );
    void onAxisHorizPositionChanged( Qt::AnchorPoint pos );
    void onAxisVertPositionChanged( Qt::AnchorPoint pos );
    void onCameraViewChange( float pitch, float yaw );
 
    void onCameraViewChangeHome( ) { onCameraViewChange( 45.0, 45.0 ); }
    void onCameraViewChangeTop( ) {onCameraViewChange( 0.0, 90.0 );}
    void onCameraViewChangeNorth( ) {onCameraViewChange( 90.0, 180.0 );}
    void onCameraViewChangeEast( ) {onCameraViewChange( 90.0, 90.0 );}
    void onCameraViewChangeSouth( ) {onCameraViewChange( 90.0, 0.0 );}
    void onCameraViewChangeWest( ) {onCameraViewChange( 90.0, -90.0 );}
    void onCameraViewChangeBottom() {onCameraViewChange( 180.0, 0.0 );}
    void populateMenu();
 
  private:
 
    void createAxisScene();
    void createAxis( Qt::Axis axis );
    void createCube( );
    void setEnableCube( bool show );
    void setEnableAxis( bool show );
    void updateAxisLabelPosition();
 
    Qt3DRender::QViewport *constructAxisViewport( Qt3DCore::QEntity *parent3DScene );
    Qt3DRender::QViewport *constructLabelViewport( Qt3DCore::QEntity *parent3DScene, const QRectF &parentViewportSize );
 
    Qt3DExtras::QText2DEntity *addCubeText( const QString &text, float textHeight, float textWidth, const QFont &f, const QMatrix4x4 &rotation, const QVector3D &translation );
 
    // axis picking and menu
    void init3DObjectPicking( );
    bool eventFilter( QObject *watched, QEvent *event ) override;
 
    void hideMenu();
    void displayMenuAt( const QPoint &position );
 
    Qgs3DMapSettings *mMapSettings = nullptr;
    Qt3DExtras::Qt3DWindow *mParentWindow = nullptr;
    Qgs3DMapScene *mMapScene = nullptr;
    QgsCameraController *mCameraController = nullptr;
 
    float mCylinderLength = 40.0f;
    int mAxisViewportSize = 4.0 * mCylinderLength;
    Qt::AnchorPoint mAxisViewportVertPos = Qt::AnchorPoint::AnchorTop;
    Qt::AnchorPoint mAxisViewportHorizPos = Qt::AnchorPoint::AnchorRight;
    int mFontSize = 10;
 
    Qt3DCore::QEntity *mAxisSceneEntity = nullptr;
    Qt3DRender::QLayer *mAxisSceneLayer = nullptr;
    Qt3DRender::QCamera *mAxisCamera = nullptr;
    Qt3DRender::QViewport *mAxisViewport = nullptr;
 
    Qgs3DAxis::Mode mMode = Mode::Crs;
    Qt3DCore::QEntity *mAxisRoot = nullptr;
    Qt3DCore::QEntity *mCubeRoot = nullptr;
    QList<Qt3DExtras::QText2DEntity *> mCubeLabels;
 
    Qt3DExtras::QText2DEntity *mTextX = nullptr;
    Qt3DExtras::QText2DEntity *mTextY = nullptr;
    Qt3DExtras::QText2DEntity *mTextZ = nullptr;
    QVector3D mTextCoordX;
    QVector3D mTextCoordY;
    QVector3D mTextCoordZ;
    Qt3DCore::QTransform *mTextTransformX = nullptr;
    Qt3DCore::QTransform *mTextTransformY = nullptr;
    Qt3DCore::QTransform *mTextTransformZ = nullptr;
    QgsCoordinateReferenceSystem mCrs;
    QVector3D mPreviousVector;
 
    Qt3DRender::QCamera *mTwoDLabelCamera  = nullptr;
    Qt3DCore::QEntity *mTwoDLabelSceneEntity = nullptr;
    Qt3DRender::QViewport *mTwoDLabelViewport = nullptr;
 
    // axis picking and menu
    Qt3DRender::QScreenRayCaster *mScreenRayCaster = nullptr;
    QPoint mLastClickedPos;
    Qt::MouseButton mLastClickedButton;
    QCursor mPreviousCursor = Qt::ArrowCursor;
    QMenu *mMenu = nullptr;
 
};
 
class Qgs3DWiredMesh : public Qt3DRender::QGeometryRenderer
{
    Q_OBJECT
 
  public:
 
    Qgs3DWiredMesh( Qt3DCore::QNode *parent = nullptr );
    ~Qgs3DWiredMesh() override;
 
    void setVertices( const QList<QVector3D> &vertices );
 
  private:
    Qt3DRender::QGeometry *mGeom = nullptr;
    Qt3DRender::QAttribute *mPositionAttribute = nullptr;
    Qt3DRender::QBuffer *mVertexBuffer = nullptr;
};
 
#endif // QGS3DAXIS_H