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Program: Visualization Toolkit
Module: vtkBezierContourLineInterpolator.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or for details.
This software is distributed WITHOUT ANY WARRANTY; without even
PURPOSE. See the above copyright notice for more information.
// .NAME vtkBezierContourLineInterpolator - Interpolates supplied nodes with bezier line segments
// .SECTION Description
// The line interpolator interpolates supplied nodes (see InterpolateLine)
// with bezier line segments. The finess of the curve may be controlled using
// SetMaximumCurveError and SetMaximumNumberOfLineSegments.
// .SECTION See Also
// vtkContourLineInterpolator
#ifndef __vtkBezierContourLineInterpolator_h
#define __vtkBezierContourLineInterpolator_h
#include "vtkContourLineInterpolator.h"
class VTK_WIDGETS_EXPORT vtkBezierContourLineInterpolator
: public vtkContourLineInterpolator
// Description:
// Instantiate this class.
static vtkBezierContourLineInterpolator *New();
// Description:
// Standard methods for instances of this class.
void PrintSelf(ostream& os, vtkIndent indent);
virtual int InterpolateLine( vtkRenderer *ren,
vtkContourRepresentation *rep,
int idx1, int idx2 );
// Description:
// The difference between a line segment connecting two points and the curve
// connecting the same points. In the limit of the length of the curve
// dx -> 0, the two values will be the same. The smaller this number, the
// finer the bezier curve will be interpolated. Default is 0.005
vtkSetClampMacro(MaximumCurveError, double, 0.0, VTK_DOUBLE_MAX);
vtkGetMacro(MaximumCurveError, double);
// Description:
// Maximum number of bezier line segments between two nodes. Larger values
// create a finer interpolation. Default is 100.
vtkSetClampMacro(MaximumCurveLineSegments, int, 1, 1000);
vtkGetMacro(MaximumCurveLineSegments, int);
// Description:
// Span of the interpolator. ie. the number of control points its supposed
// to interpolate given a node.
// The first argument is the current nodeIndex.
// ie, you'd be trying to interpolate between nodes "nodeIndex" and
// "nodeIndex-1", unless you're closing the contour in which case, you're
// trying to interpolate "nodeIndex" and "Node=0". The node span is
// returned in a vtkIntArray.
// The node span is returned in a vtkIntArray. The node span returned by
// this interpolator will be a 2-tuple with a span of 4.
virtual void GetSpan( int nodeIndex, vtkIntArray *nodeIndices,
vtkContourRepresentation *rep );
void ComputeMidpoint( double p1[3], double p2[3], double mid[3] )
mid[0] = (p1[0] + p2[0])/2;
mid[1] = (p1[1] + p2[1])/2;
mid[2] = (p1[2] + p2[2])/2;
double MaximumCurveError;
int MaximumCurveLineSegments;
vtkBezierContourLineInterpolator(const vtkBezierContourLineInterpolator&); //Not implemented
void operator=(const vtkBezierContourLineInterpolator&); //Not implemented