qgstessellator.h

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/***************************************************************************
  qgstessellator.h
  --------------------------------------
  Date                 : July 2017
  Copyright            : (C) 2017 by Martin Dobias
  Email                : wonder dot sk at gmail 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 QGSTESSELLATOR_H
#define QGSTESSELLATOR_H

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

class QgsPolygon;
class QgsMultiPolygon;

#include <QVector>
#include <memory>

class CORE_EXPORT QgsTessellator
{
  public:
    QgsTessellator( double originX, double originY, bool addNormals, bool invertNormals = false, bool addBackFaces = false );

    QgsTessellator( const QgsRectangle &bounds, bool addNormals, bool invertNormals = false, bool addBackFaces = false, bool noZ = false );

    void addPolygon( const QgsPolygon &polygon, float extrusionHeight );

    QVector<float> data() const { return mData; }

    int dataVerticesCount() const;

    int stride() const { return mStride; }

    std::unique_ptr< QgsMultiPolygon > asMultiPolygon() const SIP_SKIP;

    float zMinimum() const { return mZMin; }

    float zMaximum() const { return mZMax; }

  private:
    void init();

    QgsRectangle mBounds;
    double mOriginX = 0, mOriginY = 0;
    bool mAddNormals = false;
    bool mInvertNormals = false;
    bool mAddBackFaces = false;
    QVector<float> mData;
    int mStride;
    bool mNoZ = false;

    float mZMin = std::numeric_limits<float>::max();
    float mZMax = std::numeric_limits<float>::min();
};

#endif // QGSTESSELLATOR_H