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/*=========================================================================
Program: Visualization Toolkit
Module: vtkPath.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.
=========================================================================*/
// .NAME vtkPath - concrete dataset representing a path defined by Bezier
// curves.
// .SECTION Description
// vtkPath provides a container for paths composed of line segment and
// 2nd/3rd order Bezier curves.
#ifndef vtkPath_h
#define vtkPath_h
#include "vtkCommonDataModelModule.h" // For export macro
#include "vtkPointSet.h"
class vtkIntArray;
class VTKCOMMONDATAMODEL_EXPORT vtkPath : public vtkPointSet
{
public:
static vtkPath *New();
vtkTypeMacro(vtkPath,vtkPointSet);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Return what type of dataset this is.
int GetDataObjectType() {return VTK_PATH;}
// Description:
// Enumeration of recognized control point types:
// - MOVE_TO: Point defining the origin of a new segment, not connected to
// the previous point.
// - LINE_TO: Draw a line from the previous point to the current one
// - CONIC_CURVE: 2nd order (conic/quadratic) point. Must appear
// in sets of 2, e.g. (0,0) MOVE_TO (0,1) CONIC_CURVE (1,2) CONIC_CURVE
// defines a quadratic Bezier curve that passes through (0,0) and (1,2)
// using (0,1) as a control (off) point.
// - CUBIC_CURVE: 3rd order (cubic) control point. Must appear in sets of
// 3, e.g. (0,0) MOVE_TO (0,1) CUBIC_CURVE (1,2) CUBIC_CURVE (4,0)
// CUBIC_CURVE defines a cubic Bezier curve that passes through (0,0)
// and (4,0), using (0,1) and (1,2) as control (off) points.
enum ControlPointType
{
MOVE_TO = 0,
LINE_TO,
CONIC_CURVE,
CUBIC_CURVE
};
// Description:
// Insert the next control point in the path.
void InsertNextPoint(float pts[3], int code);
void InsertNextPoint(double pts[3], int code);
void InsertNextPoint(double x, double y, double z, int code);
// Description:
// Set/Get the array of control point codes:
void SetCodes(vtkIntArray *);
vtkIntArray *GetCodes();
// Description:
//vtkPath doesn't use cells. These methods return trivial values.
vtkIdType GetNumberOfCells() { return 0; }
vtkCell *GetCell(vtkIdType) { return NULL; }
void GetCell(vtkIdType, vtkGenericCell *);
int GetCellType(vtkIdType) { return 0; }
// Description:
// vtkPath doesn't use cells, this method just clears ptIds.
void GetCellPoints(vtkIdType, vtkIdList *ptIds);
// Description:
// vtkPath doesn't use cells, this method just clears cellIds.
void GetPointCells(vtkIdType ptId, vtkIdList *cellIds);
// Description:
// Return the maximum cell size in this poly data.
int GetMaxCellSize() { return 0; }
// Description:
// Method allocates initial storage for points. Use this method before the
// method vtkPath::InsertNextPoint().
void Allocate(vtkIdType size=1000, int extSize=1000);
// Description:
// Begin inserting data all over again. Memory is not freed but otherwise
// objects are returned to their initial state.
void Reset();
// Description:
// Retrieve an instance of this class from an information object.
static vtkPath* GetData(vtkInformation* info);
static vtkPath* GetData(vtkInformationVector* v, int i=0);
protected:
vtkPath();
~vtkPath();
private:
vtkPath(const vtkPath&); // Not implemented.
void operator=(const vtkPath&); // Not implemented.
};
#endif
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