qgsbeziermarker.h

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/***************************************************************************
    qgsbeziermarker.h  -  Visualization for Poly-Bézier curve digitizing
    ---------------------
    begin                : December 2025
    copyright            : (C) 2025 by Loïc Bartoletti
                           Adapted from BezierEditing plugin work by Takayuki Mizutani
    email                : loic dot bartoletti 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 QGSBEZIERMARKER_H
#define QGSBEZIERMARKER_H
 
#include <memory>
#include <vector>
 
#include "qgis_gui.h"
#include "qgsbezierdata.h"
#include "qobjectuniqueptr.h"
 
#include <QObject>
 
#define SIP_NO_FILE
 
class QgsMapCanvas;
class QgsRubberBand;
class QgsVertexMarker;
 


class GUI_EXPORT QgsBezierMarker : public QObject
{
    Q_OBJECT
 
  public:
    struct MarkerConfig
    {
        static constexpr int AnchorMarkerSize = 10;
        static constexpr int HandleMarkerSize = 8;
        static constexpr int MarkerPenWidth = 2;
        static constexpr int HandleLineWidth = 1;
        static constexpr int FillAlpha = 100;
        static constexpr int HandleLineAlpha = 150;
        static constexpr int SelectionAlpha = 150;
    };

    explicit QgsBezierMarker( QgsMapCanvas *canvas, QObject *parent = nullptr );
 
    ~QgsBezierMarker() override;

    void updateFromData( const QgsBezierData &data );

    void updateCurve( const QgsBezierData &data );

    void setVisible( bool visible );

    void setHandlesVisible( bool visible );

    void clear();

    void setHighlightedAnchor( int idx );

    void setHighlightedHandle( int idx );
 
  private:
    QgsMapCanvas *mCanvas = nullptr;
 
    std::vector<QgsVertexMarker *> mAnchorMarkers;
    std::vector<QgsVertexMarker *> mHandleMarkers;
    std::vector<QObjectUniquePtr<QgsRubberBand>> mHandleLines;
    QObjectUniquePtr<QgsRubberBand> mCurveRubberBand;
 
    int mHighlightedAnchor = -1;
    int mHighlightedHandle = -1;
 
    bool mVisible = true;
    bool mHandlesVisible = true;

    QgsVertexMarker *createAnchorMarker();

    QgsVertexMarker *createHandleMarker();

    QObjectUniquePtr<QgsRubberBand> createHandleLine();

    void updateAnchorMarkers( const QgsBezierData &data );

    void updateHandleMarkers( const QgsBezierData &data );

    void updateHandleLines( const QgsBezierData &data );
};

 
#endif // QGSBEZIERMARKER_H