qgscurve.h

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/***************************************************************************
                         qgscurve.h
                         ------------
    begin                : September 2014
    copyright            : (C) 2014 by Marco Hugentobler
    email                : marco at sourcepole dot ch
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 QGSCURVE_H
#define QGSCURVE_H

#include "qgis_core.h"
#include "qgis_sip.h"
#include "qgsabstractgeometry.h"
#include "qgsrectangle.h"

class QgsLineString;
class QPainterPath;

class CORE_EXPORT QgsCurve: public QgsAbstractGeometry
{
  public:

    QgsCurve() = default;

    virtual bool equals( const QgsCurve &other ) const = 0;

    bool operator==( const QgsAbstractGeometry &other ) const override;
    bool operator!=( const QgsAbstractGeometry &other ) const override;

    QgsCurve *clone() const override = 0 SIP_FACTORY;

    virtual QgsPoint startPoint() const = 0;

    virtual QgsPoint endPoint() const = 0;

    virtual bool isClosed() const;

    virtual bool isRing() const;

    virtual QgsLineString *curveToLine( double tolerance = M_PI_2 / 90, SegmentationToleranceType toleranceType = MaximumAngle ) const = 0 SIP_FACTORY;

    virtual void addToPainterPath( QPainterPath &path ) const = 0;

    virtual void drawAsPolygon( QPainter &p ) const = 0;

    virtual void points( QgsPointSequence &pt SIP_OUT ) const = 0;

    virtual int numPoints() const = 0;

#ifdef SIP_RUN
    int __len__() const;
    % Docstring
    Returns the number of points in the curve.
    % End
    % MethodCode
    sipRes = sipCpp->numPoints();
    % End

    int __bool__() const;
    % MethodCode
    sipRes = true;
    % End
#endif

    virtual void sumUpArea( double &sum SIP_OUT ) const = 0;

    QgsCoordinateSequence coordinateSequence() const override;
    bool nextVertex( QgsVertexId &id, QgsPoint &vertex SIP_OUT ) const override;
    void adjacentVertices( QgsVertexId vertex, QgsVertexId &previousVertex SIP_OUT, QgsVertexId &nextVertex SIP_OUT ) const override;
    int vertexNumberFromVertexId( QgsVertexId id ) const override;

    virtual bool pointAt( int node, QgsPoint &point SIP_OUT, QgsVertexId::VertexType &type SIP_OUT ) const = 0;

    virtual QgsCurve *reversed() const = 0 SIP_FACTORY;

    QgsAbstractGeometry *boundary() const override SIP_FACTORY;

    QgsCurve *segmentize( double tolerance = M_PI_2 / 90, SegmentationToleranceType toleranceType = MaximumAngle ) const override SIP_FACTORY;

    int vertexCount( int part = 0, int ring = 0 ) const override;
    int ringCount( int part = 0 ) const override;
    int partCount() const override;
    QgsPoint vertexAt( QgsVertexId id ) const override;
    QgsCurve *toCurveType() const override SIP_FACTORY;

    QgsRectangle boundingBox() const override;
    bool isValid( QString &error SIP_OUT, int flags = 0 ) const override;

    virtual double xAt( int index ) const = 0;

    virtual double yAt( int index ) const = 0;

    virtual QPolygonF asQPolygonF() const;

    virtual QgsPoint *interpolatePoint( double distance ) const = 0 SIP_FACTORY;

    virtual QgsCurve *curveSubstring( double startDistance, double endDistance ) const = 0 SIP_FACTORY;

    double straightDistance2d() const;

    double sinuosity() const;

    enum Orientation
    {
      Clockwise, 
      CounterClockwise, 
    };

    Orientation orientation() const;

#ifndef SIP_RUN

    inline const QgsCurve *cast( const QgsAbstractGeometry *geom ) const
    {
      if ( !geom )
        return nullptr;

      QgsWkbTypes::Type type = geom->wkbType();
      if ( QgsWkbTypes::geometryType( type ) == QgsWkbTypes::LineGeometry && QgsWkbTypes::isSingleType( type ) )
      {
        return static_cast<const QgsCurve *>( geom );
      }
      return nullptr;
    }
#endif


  protected:

    void clearCache() const override;

    int childCount() const override;
    QgsPoint childPoint( int index ) const override;

#ifndef SIP_RUN

    bool snapToGridPrivate( double hSpacing, double vSpacing, double dSpacing, double mSpacing,
                            const QVector<double> &srcX, const QVector<double> &srcY, const QVector<double> &srcZ, const QVector<double> &srcM,
                            QVector<double> &outX, QVector<double> &outY, QVector<double> &outZ, QVector<double> &outM ) const;
#endif

  private:

    mutable QgsRectangle mBoundingBox;

    mutable bool mHasCachedValidity = false;
    mutable QString mValidityFailureReason;
};

#endif // QGSCURVE_H