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qgscurvev2.h
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qgscurvev2.h
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/***************************************************************************
qgscurvev2.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 QGSCURVEV2_H
#define QGSCURVEV2_H
#include "qgsabstractgeometryv2.h"
#include "qgspointv2.h"
class QgsLineStringV2;
class QPainterPath;
/** \ingroup core
* \class QgsCurveV2
* \brief Abstract base class for curved geometry type
* \note added in QGIS 2.10
*/
class CORE_EXPORT QgsCurveV2: public QgsAbstractGeometryV2
{
public:
QgsCurveV2();
virtual ~QgsCurveV2();
/** Returns the starting point of the curve.
* @see endPoint
*/
virtual QgsPointV2 startPoint() const = 0;
/** Returns the end point of the curve.
* @see startPoint
*/
virtual QgsPointV2 endPoint() const = 0;
/** Returns true if the curve is closed.
*/
virtual bool isClosed() const;
/** Returns true if the curve is a ring.
*/
virtual bool isRing() const;
/** Returns a new line string geometry corresponding to a segmentized approximation
* of the curve.
*/
virtual QgsLineStringV2* curveToLine() const = 0;
/** Adds a curve to a painter path.
*/
virtual void addToPainterPath( QPainterPath& path ) const = 0;
/** Draws the curve as a polygon on the specified QPainter.
* @param p destination QPainter
*/
virtual void drawAsPolygon( QPainter& p ) const = 0;
/** Returns a list of points within the curve.
*/
virtual void points( QList<QgsPointV2>& pt ) const = 0;
/** Returns the number of points in the curve.
*/
virtual int numPoints() const = 0;
/** Calculates the area of the curve. Derived classes should override this
* to return the correct area of the curve.
*/
virtual void sumUpArea( double& sum ) const = 0;
virtual void coordinateSequence( QList< QList< QList< QgsPointV2 > > >& coord ) const override;
virtual bool nextVertex( QgsVertexId& id, QgsPointV2& vertex ) const override;
/** Returns the point and vertex id of a point within the curve.
*/
virtual bool pointAt( int i, QgsPointV2& vertex, QgsVertexId::VertexType& type ) const = 0;
QgsAbstractGeometryV2* segmentize() const override;
virtual int vertexCount( int /*part*/ = 0, int /*ring*/ = 0 ) const override { return numPoints(); }
virtual int ringCount( int /*part*/ = 0 ) const override { return numPoints() > 0 ? 1 : 0; }
virtual int partCount() const override { return numPoints() > 0 ? 1 : 0; }
virtual QgsPointV2 vertexAt( const QgsVertexId& id ) const override;
};
#endif // QGSCURVEV2_H