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"
#include <QPainterPath>
 
class QgsLineString;
 
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;
 
    QString asKml( int precision = 17 ) const override;
 
    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