/***************************************************************************
 *   Copyright (c) 2005 Werner Mayer <wmayer[at]users.sourceforge.net>     *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  is distributed in the hope that it will be useful,      *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/

#ifndef GUI_SOFCCOLORGRADIENT_H
#define GUI_SOFCCOLORGRADIENT_H

#include <vector>
#include <Inventor/SbBox2f.h>
#include <Inventor/nodes/SoSeparator.h>

#include "SoFCColorBar.h"


class SoCoordinate3;
class SoIndexedFaceSet;
class SoMaterial;
class SoMaterialBinding;
class SoMFString;
class SoTransparencyType;
class SbVec2s;

namespace Gui {

class GuiExport SoFCColorGradient : public SoFCColorBarBase {
  using inherited = SoFCColorBarBase;

  SO_NODE_HEADER(Gui::SoFCColorGradient);

public:
  static void initClass();
  static void finish();
  SoFCColorGradient();

  /**
   * Sets the range of the colorbar from the maximum \a fMax to the minimum \a fMin.
   * \a prec indicates the post decimal positions, \a prec should be in between 0 and 6.
   */
  void setRange( float fMin, float fMax, int prec=3 ) override;
  /**
   * Returns the associated color to the value \a fVal.
   */
  App::Color getColor (float fVal) const override { return _cColGrad.getColor(fVal); }
  void setOutsideGrayed (bool bVal) override { _cColGrad.setOutsideGrayed(bVal); }
  /**
   * Returns always true if the gradient is in mode to show colors to arbitrary values of \a fVal,
   * otherwise true is returned if \a fVal is within the specified parameter range, if not false is
   * returned.
   */
  bool isVisible (float fVal) const override;
  /** Returns the current minimum of the parameter range. */
  float getMinValue () const override { return _cColGrad.getMinValue(); }
  /** Returns the current maximum of the parameter range. */
  float getMaxValue () const override { return _cColGrad.getMaxValue(); }
  /**
   * Opens a dialog to customize the current settings of the color gradient bar.
   */
  void customize(SoFCColorBarBase*) override;
  /** Returns the name of the color bar. */
  const char* getColorBarName() const override;

protected:
  void applyFormat(const SoLabelTextFormat& fmt) override;
  /**
   * Sets the current viewer size this color gradient is embedded into, to recalculate its new position.
   */
  void setViewportSize( const SbVec2s& size ) override;

  ~SoFCColorGradient() override;
  /**
   * Sets the color model of the underlying color gradient to \a index.
   */
  void setColorModel (std::size_t index);
  /**
   * Sets the color style of the underlying color gradient to \a tStyle. \a tStyle either can
   * be \c FLOW or \c ZERO_BASED
   */
  void setColorStyle (App::ColorBarStyle tStyle);
  /** Rebuild the gradient bar. */
  void rebuildGradient();
  /** Returns a list of \a count labels within the range [\a fMin, \a fMax].  */
  std::vector<float> getMarkerValues(float fMin, float fMax, int count) const;

private:
  bool isZeroBased(float fMin, float fMax) const;
  /** Sets the new labels. */
  int getNumColors() const;
  void setMarkerLabel( const SoMFString& label );
  void modifyPoints(const SbBox2f&);
  void setCoordSize(int numPoints);
  SoIndexedFaceSet* createFaceSet(int numFaces) const;
  SoTransparencyType* createTransparencyType() const;
  SoMaterial* createMaterial() const;
  SoMaterialBinding* createMaterialBinding() const;

private:
  SoCoordinate3* coords;
  SoSeparator* labels;
  SbBox2f _bbox;
  int _precision{3};
  App::ColorGradient _cColGrad;
};

} // namespace Gui


#endif // GUI_SOFCCOLORGRADIENT_H
