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82 lines
3.3 KiB
82 lines
3.3 KiB
2 years ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkStreamLine.h,v $
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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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// .NAME vtkStreamLine - generate streamline in arbitrary dataset
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// .SECTION Description
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// vtkStreamLine is a filter that generates a streamline for an arbitrary
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// dataset. A streamline is a line that is everywhere tangent to the vector
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// field. Scalar values also are calculated along the streamline and can be
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// used to color the line. Streamlines are calculated by integrating from
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// a starting point through the vector field. Integration can be performed
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// forward in time (see where the line goes), backward in time (see where the
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// line came from), or in both directions. It also is possible to compute
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// vorticity along the streamline. Vorticity is the projection (i.e., dot
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// product) of the flow rotation on the velocity vector, i.e., the rotation
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// of flow around the streamline.
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//
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// vtkStreamLine defines the instance variable StepLength. This parameter
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// controls the time increment used to generate individual points along
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// the streamline(s). Smaller values result in more line
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// primitives but smoother streamlines. The StepLength instance variable is
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// defined in terms of time (i.e., the distance that the particle travels in
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// the specified time period). Thus, the line segments will be smaller in areas
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// of low velocity and larger in regions of high velocity. (NOTE: This is
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// different than the IntegrationStepLength defined by the superclass
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// vtkStreamer. IntegrationStepLength is used to control integration step
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// size and is expressed as a fraction of the cell length.) The StepLength
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// instance variable is important because subclasses of vtkStreamLine (e.g.,
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// vtkDashedStreamLine) depend on this value to build their representation.
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// .SECTION See Also
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// vtkStreamer vtkDashedStreamLine vtkStreamPoints
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#ifndef __vtkStreamLine_h
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#define __vtkStreamLine_h
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#include "vtkStreamer.h"
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class VTK_GRAPHICS_EXPORT vtkStreamLine : public vtkStreamer
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{
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public:
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vtkTypeRevisionMacro(vtkStreamLine,vtkStreamer);
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void PrintSelf(ostream& os, vtkIndent indent);
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// Description:
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// Construct object with step size set to 1.0.
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static vtkStreamLine *New();
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// Description:
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// Specify the length of a line segment. The length is expressed in terms of
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// elapsed time. Smaller values result in smoother appearing streamlines, but
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// greater numbers of line primitives.
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vtkSetClampMacro(StepLength,double,0.000001,VTK_DOUBLE_MAX);
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vtkGetMacro(StepLength,double);
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protected:
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vtkStreamLine();
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~vtkStreamLine() {};
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// Convert streamer array into vtkPolyData
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virtual int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
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// the length of line primitives
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double StepLength;
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private:
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vtkStreamLine(const vtkStreamLine&); // Not implemented.
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void operator=(const vtkStreamLine&); // Not implemented.
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};
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#endif
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