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138 lines
3.8 KiB
C++
138 lines
3.8 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkPath.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkPath
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* @brief concrete dataset representing a path defined by Bezier
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* curves.
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*
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* vtkPath provides a container for paths composed of line segments,
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* 2nd-order (quadratic) and 3rd-order (cubic) Bezier curves.
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*/
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#ifndef vtkPath_h
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#define vtkPath_h
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#include "vtkCommonDataModelModule.h" // For export macro
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#include "vtkPointSet.h"
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class vtkIntArray;
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class VTKCOMMONDATAMODEL_EXPORT vtkPath : public vtkPointSet
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{
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public:
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static vtkPath* New();
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vtkTypeMacro(vtkPath, vtkPointSet);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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/**
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* Return what type of dataset this is.
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*/
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int GetDataObjectType() override { return VTK_PATH; }
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/**
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* Enumeration of recognized control point types:
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* - MOVE_TO: Point defining the origin of a new segment, not connected to
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* the previous point.
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* - LINE_TO: Draw a line from the previous point to the current one
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* - CONIC_CURVE: 2nd order (conic/quadratic) point. Must appear
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* in sets of 2, e.g. (0,0) MOVE_TO (0,1) CONIC_CURVE (1,2) CONIC_CURVE
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* defines a quadratic Bezier curve that passes through (0,0) and (1,2)
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* using (0,1) as a control (off) point.
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* - CUBIC_CURVE: 3rd order (cubic) control point. Must appear in sets of
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* 3, e.g. (0,0) MOVE_TO (0,1) CUBIC_CURVE (1,2) CUBIC_CURVE (4,0)
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* CUBIC_CURVE defines a cubic Bezier curve that passes through (0,0)
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* and (4,0), using (0,1) and (1,2) as control (off) points.
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*/
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enum ControlPointType
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{
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MOVE_TO = 0,
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LINE_TO,
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CONIC_CURVE,
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CUBIC_CURVE
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};
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//@{
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/**
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* Insert the next control point in the path.
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*/
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void InsertNextPoint(float pts[3], int code);
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void InsertNextPoint(double pts[3], int code);
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void InsertNextPoint(double x, double y, double z, int code);
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//@}
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//@{
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/**
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* Set/Get the array of control point codes:
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*/
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void SetCodes(vtkIntArray*);
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vtkIntArray* GetCodes();
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//@}
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/**
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* vtkPath doesn't use cells. These methods return trivial values.
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*/
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vtkIdType GetNumberOfCells() override { return 0; }
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using vtkDataSet::GetCell;
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vtkCell* GetCell(vtkIdType) override { return nullptr; }
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void GetCell(vtkIdType, vtkGenericCell*) override;
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int GetCellType(vtkIdType) override { return 0; }
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/**
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* vtkPath doesn't use cells, this method just clears ptIds.
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*/
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void GetCellPoints(vtkIdType, vtkIdList* ptIds) override;
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/**
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* vtkPath doesn't use cells, this method just clears cellIds.
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*/
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void GetPointCells(vtkIdType ptId, vtkIdList* cellIds) override;
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/**
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* Return the maximum cell size in this poly data.
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*/
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int GetMaxCellSize() override { return 0; }
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/**
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* Method allocates initial storage for points. Use this method before the
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* method vtkPath::InsertNextPoint().
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*/
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void Allocate(vtkIdType size = 1000, int extSize = 1000);
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/**
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* Begin inserting data all over again. Memory is not freed but otherwise
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* objects are returned to their initial state.
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*/
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void Reset();
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//@{
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/**
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* Retrieve an instance of this class from an information object.
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*/
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static vtkPath* GetData(vtkInformation* info);
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static vtkPath* GetData(vtkInformationVector* v, int i = 0);
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//@}
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protected:
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vtkPath();
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~vtkPath() override;
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private:
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vtkPath(const vtkPath&) = delete;
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void operator=(const vtkPath&) = delete;
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};
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#endif
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