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

  Program:   Visualization Toolkit
  Module:    vtkTextureMapToCylinder.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
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=========================================================================*/
// .NAME vtkTextureMapToCylinder - generate texture coordinates by mapping points to cylinder
// .SECTION Description
// vtkTextureMapToCylinder is a filter that generates 2D texture coordinates
// by mapping input dataset points onto a cylinder. The cylinder can either be
// user specified or generated automatically. (The cylinder is generated 
// automatically by computing the axis of the cylinder.)  Note that the
// generated texture coordinates for the s-coordinate ranges from (0-1) 
// (corresponding to angle of 0->360 around axis), while the mapping of 
// the t-coordinate is controlled by the projection of points along the axis.
//
// To specify a cylinder manually, you must provide two points that
// define the axis of the cylinder. The length of the axis will affect the
// t-coordinates.
// 
// A special ivar controls how the s-coordinate is generated. If PreventSeam
// is set to true, the s-texture varies from 0->1 and then 1->0 (corresponding
// to angles of 0->180 and 180->360).

// .SECTION Caveats
// Since the resulting texture s-coordinate will lie between (0,1), and the
// origin of the texture coordinates is not user-controllable, you may want
// to se the class vtkTransformTexture to linearly scale and shift the origin
// of the texture coordinates.

// .SECTION See Also
// vtkTextureMapToPlane vtkTextureMapToSphere vtkTextureMapToBox
// vtkTransformTexture vtkThresholdTextureCoords

#ifndef __vtkTextureMapToCylinder_h
#define __vtkTextureMapToCylinder_h

#include "vtkDataSetToDataSetFilter.h"

class VTK_EXPORT vtkTextureMapToCylinder : public vtkDataSetToDataSetFilter 
{
public:
  vtkTypeMacro(vtkTextureMapToCylinder,vtkDataSetToDataSetFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Create object with cylinder axis parallel to z-axis (points (0,0,-0.5) 
  // and (0,0,0.5)). The PreventSeam ivar is set to true. The cylinder is 
  // automatically generated.
  static vtkTextureMapToCylinder *New();

  // Description:
  // Specify the first point defining the cylinder axis,
  vtkSetVector3Macro(Point1,float);
  vtkGetVectorMacro(Point1,float,3);

  // Description:
  // Specify the second point defining the cylinder axis,
  vtkSetVector3Macro(Point2,float);
  vtkGetVectorMacro(Point2,float,3);

  // Description:
  // Turn on/off automatic cylinder generation. This means it automatically
  // finds the cylinder center and axis.
  vtkSetMacro(AutomaticCylinderGeneration,int);
  vtkGetMacro(AutomaticCylinderGeneration,int);
  vtkBooleanMacro(AutomaticCylinderGeneration,int);

  // Description:
  // Control how the texture coordinates are generated. If PreventSeam is
  // set, the s-coordinate ranges from 0->1 and 1->0 corresponding to the
  // angle variation from 0->180 and 180->0. Otherwise, the s-ccordinate
  // ranges from 0->1 from 0->360 degrees.
  vtkSetMacro(PreventSeam,int);
  vtkGetMacro(PreventSeam,int);
  vtkBooleanMacro(PreventSeam,int);

protected:
  vtkTextureMapToCylinder();
  ~vtkTextureMapToCylinder() {};
  vtkTextureMapToCylinder(const vtkTextureMapToCylinder&) {};
  void operator=(const vtkTextureMapToCylinder&) {};

  void Execute();

  float Point1[3];
  float Point2[3];
  int AutomaticCylinderGeneration;
  int PreventSeam;

};

#endif


