qgslayoutitempolyline.h

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/***************************************************************************
                         qgslayoutitempolyline.h
    begin                : March 2016
    copyright            : (C) 2016 Paul Blottiere, Oslandia
     email                : paul dot blottiere 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 QGSLAYOUTITEMPOLYLINE_H
#define QGSLAYOUTITEMPOLYLINE_H
 
#include "qgis_core.h"
#include "qgslayout.h"
#include "qgslayoutitemnodeitem.h"
#include "qgslogger.h"
 
#include <QGraphicsPathItem>
 
class QgsLineSymbol;

class CORE_EXPORT QgsLayoutItemPolyline : public QgsLayoutNodesItem
{
    Q_OBJECT
 
  public:
    enum MarkerMode
    {
      NoMarker,  
      ArrowHead, 
      SvgMarker, 
    };

    QgsLayoutItemPolyline( QgsLayout *layout );
    ~QgsLayoutItemPolyline() override;

    QgsLayoutItemPolyline( const QPolygonF &polyline, QgsLayout *layout );

    static QgsLayoutItemPolyline *create( QgsLayout *layout ) SIP_FACTORY;
 
    int type() const override;
    QIcon icon() const override;
    QString displayName() const override;
    QPainterPath shape() const override;
    bool isValid() const override;

    QgsLineSymbol *symbol();

    void setSymbol( QgsLineSymbol *symbol );

    MarkerMode startMarker() const { return mStartMarker; }

    void setStartMarker( MarkerMode mode );

    MarkerMode endMarker() const { return mEndMarker; }

    void setEndMarker( MarkerMode mode );

    void setArrowHeadWidth( double width );

    double arrowHeadWidth() const { return mArrowHeadWidth; }

    void setStartSvgMarkerPath( const QString &path );

    QString startSvgMarkerPath() const { return mStartMarkerFile; }

    void setEndSvgMarkerPath( const QString &path );

    QString endSvgMarkerPath() const { return mEndMarkerFile; }

    QColor arrowHeadStrokeColor() const { return mArrowHeadStrokeColor; }

    void setArrowHeadStrokeColor( const QColor &color );

    QColor arrowHeadFillColor() const { return mArrowHeadFillColor; }

    void setArrowHeadFillColor( const QColor &color );

    void setArrowHeadStrokeWidth( double width );

    double arrowHeadStrokeWidth() const { return mArrowHeadStrokeWidth; }
 
    bool accept( QgsStyleEntityVisitorInterface *visitor ) const override;
 
  protected:
    bool _addNode( int indexPoint, QPointF newPoint, double radius ) override;
    bool _removeNode( int nodeIndex ) override;
    void _draw( QgsLayoutItemRenderContext &context, const QStyleOptionGraphicsItem *itemStyle = nullptr ) override;
    void _readXmlStyle( const QDomElement &elmt, const QgsReadWriteContext &context ) override;
    void _writeXmlStyle( QDomDocument &doc, QDomElement &elmt, const QgsReadWriteContext &context ) const override;
    bool writePropertiesToElement( QDomElement &element, QDomDocument &document, const QgsReadWriteContext &context ) const override;
    bool readPropertiesFromElement( const QDomElement &element, const QDomDocument &document, const QgsReadWriteContext &context ) override;
 
  protected slots:
 
    void updateBoundingRect() override;
 
  private:
    std::unique_ptr<QgsLineSymbol> mPolylineStyleSymbol;

    MarkerMode mStartMarker = NoMarker;
    MarkerMode mEndMarker = NoMarker;

    double mArrowHeadWidth = 4.0;

    double mStartArrowHeadHeight = 0.0;

    double mEndArrowHeadHeight = 0.0;

    QString mStartMarkerFile;

    QString mEndMarkerFile;

    double mArrowHeadStrokeWidth = 1.0;
 
    QColor mArrowHeadStrokeColor = Qt::black;
    QColor mArrowHeadFillColor = Qt::black;

    void createDefaultPolylineStyleSymbol();

    void refreshSymbol();
 
    void drawStartMarker( QPainter *painter );
    void drawEndMarker( QPainter *painter );
 
    void drawArrow( QPainter *painter, QPointF center, double angle );
 
    void updateMarkerSvgSizes();

    static void drawArrowHead( QPainter *p, double x, double y, double angle, double arrowHeadWidth );
    void drawSvgMarker( QPainter *p, QPointF point, double angle, const QString &markerPath, double height ) const;
 
    double computeMarkerMargin() const;
 
    friend class TestQgsLayoutPolyline;
    friend class QgsCompositionConverter;
};
 
#endif // QGSLAYOUTITEMPOLYLINE_H