/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkRibbonFilter.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/**
 * @class   vtkRibbonFilter
 * @brief   create oriented ribbons from lines defined in polygonal dataset
 *
 * vtkRibbonFilter is a filter to create oriented ribbons from lines defined
 * in polygonal dataset. The orientation of the ribbon is along the line
 * segments and perpendicular to "projected" line normals. Projected line
 * normals are the original line normals projected to be perpendicular to
 * the local line segment. An offset angle can be specified to rotate the
 * ribbon with respect to the normal.
 *
 * @warning
 * The input line must not have duplicate points, or normals at points that
 * are parallel to the incoming/outgoing line segments. (Duplicate points
 * can be removed with vtkCleanPolyData.) If a line does not meet this
 * criteria, then that line is not tubed.
 *
 * @sa
 * vtkTubeFilter
 */

#ifndef vtkRibbonFilter_h
#define vtkRibbonFilter_h

#include "vtkFiltersModelingModule.h" // For export macro
#include "vtkPolyDataAlgorithm.h"

#define VTK_TCOORDS_OFF 0
#define VTK_TCOORDS_FROM_NORMALIZED_LENGTH 1
#define VTK_TCOORDS_FROM_LENGTH 2
#define VTK_TCOORDS_FROM_SCALARS 3

class vtkCellArray;
class vtkCellData;
class vtkDataArray;
class vtkFloatArray;
class vtkPointData;
class vtkPoints;

class VTKFILTERSMODELING_EXPORT vtkRibbonFilter : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkRibbonFilter, vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  /**
   * Construct ribbon so that width is 0.1, the width does
   * not vary with scalar values, and the width factor is 2.0.
   */
  static vtkRibbonFilter* New();

  ///@{
  /**
   * Set the "half" width of the ribbon. If the width is allowed to vary,
   * this is the minimum width. The default is 0.5
   */
  vtkSetClampMacro(Width, double, 0, VTK_DOUBLE_MAX);
  vtkGetMacro(Width, double);
  ///@}

  ///@{
  /**
   * Set the offset angle of the ribbon from the line normal. (The angle
   * is expressed in degrees.) The default is 0.0
   */
  vtkSetClampMacro(Angle, double, 0, 360);
  vtkGetMacro(Angle, double);
  ///@}

  ///@{
  /**
   * Turn on/off the variation of ribbon width with scalar value.
   * The default is Off
   */
  vtkSetMacro(VaryWidth, vtkTypeBool);
  vtkGetMacro(VaryWidth, vtkTypeBool);
  vtkBooleanMacro(VaryWidth, vtkTypeBool);
  ///@}

  ///@{
  /**
   * Set the maximum ribbon width in terms of a multiple of the minimum width.
   * The default is 2.0
   */
  vtkSetMacro(WidthFactor, double);
  vtkGetMacro(WidthFactor, double);
  ///@}

  ///@{
  /**
   * Set the default normal to use if no normals are supplied, and
   * DefaultNormalOn is set. The default is (0,0,1)
   */
  vtkSetVector3Macro(DefaultNormal, double);
  vtkGetVectorMacro(DefaultNormal, double, 3);
  ///@}

  ///@{
  /**
   * Set a boolean to control whether to use default normals.
   * The default is Off
   */
  vtkSetMacro(UseDefaultNormal, vtkTypeBool);
  vtkGetMacro(UseDefaultNormal, vtkTypeBool);
  vtkBooleanMacro(UseDefaultNormal, vtkTypeBool);
  ///@}

  ///@{
  /**
   * Control whether and how texture coordinates are produced. This is
   * useful for striping the ribbon with time textures, etc.
   */
  vtkSetClampMacro(GenerateTCoords, int, VTK_TCOORDS_OFF, VTK_TCOORDS_FROM_SCALARS);
  vtkGetMacro(GenerateTCoords, int);
  void SetGenerateTCoordsToOff() { this->SetGenerateTCoords(VTK_TCOORDS_OFF); }
  void SetGenerateTCoordsToNormalizedLength()
  {
    this->SetGenerateTCoords(VTK_TCOORDS_FROM_NORMALIZED_LENGTH);
  }
  void SetGenerateTCoordsToUseLength() { this->SetGenerateTCoords(VTK_TCOORDS_FROM_LENGTH); }
  void SetGenerateTCoordsToUseScalars() { this->SetGenerateTCoords(VTK_TCOORDS_FROM_SCALARS); }
  const char* GetGenerateTCoordsAsString();
  ///@}

  ///@{
  /**
   * Control the conversion of units during the texture coordinates
   * calculation. The TextureLength indicates what length (whether
   * calculated from scalars or length) is mapped to the [0,1)
   * texture space. The default is 1.0
   */
  vtkSetClampMacro(TextureLength, double, 0.000001, VTK_INT_MAX);
  vtkGetMacro(TextureLength, double);
  ///@}

protected:
  vtkRibbonFilter();
  ~vtkRibbonFilter() override;

  int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
  double Width;
  double Angle;
  vtkTypeBool VaryWidth; // controls whether width varies with scalar data
  double WidthFactor;
  double DefaultNormal[3];
  vtkTypeBool UseDefaultNormal;
  int GenerateTCoords;  // control texture coordinate generation
  double TextureLength; // this length is mapped to [0,1) texture space

  // Helper methods
  int GeneratePoints(vtkIdType offset, vtkIdType npts, const vtkIdType* pts, vtkPoints* inPts,
    vtkPoints* newPts, vtkPointData* pd, vtkPointData* outPD, vtkFloatArray* newNormals,
    vtkDataArray* inScalars, double range[2], vtkDataArray* inNormals);
  void GenerateStrip(vtkIdType offset, vtkIdType npts, const vtkIdType* pts, vtkIdType inCellId,
    vtkCellData* cd, vtkCellData* outCD, vtkCellArray* newStrips);
  void GenerateTextureCoords(vtkIdType offset, vtkIdType npts, const vtkIdType* pts,
    vtkPoints* inPts, vtkDataArray* inScalars, vtkFloatArray* newTCoords);
  vtkIdType ComputeOffset(vtkIdType offset, vtkIdType npts);

  // Helper data members
  double Theta;

private:
  vtkRibbonFilter(const vtkRibbonFilter&) = delete;
  void operator=(const vtkRibbonFilter&) = delete;
};

#endif
