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151 lines
5.0 KiB
C++
151 lines
5.0 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkBox.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 vtkBox
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* @brief implicit function for a bounding box
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*
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* vtkBox computes the implicit function and/or gradient for a axis-aligned
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* bounding box. (The superclasses transform can be used to modify this
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* orientation.) Each side of the box is orthogonal to all other sides
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* meeting along shared edges and all faces are orthogonal to the x-y-z
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* coordinate axes. (If you wish to orient this box differently, recall that
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* the superclass vtkImplicitFunction supports a transformation matrix.)
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* vtkCube is a concrete implementation of vtkImplicitFunction.
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*
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* @sa
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* vtkCubeSource vtkImplicitFunction
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*/
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#ifndef vtkBox_h
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#define vtkBox_h
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#include "vtkCommonDataModelModule.h" // For export macro
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#include "vtkImplicitFunction.h"
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class vtkBoundingBox;
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class VTKCOMMONDATAMODEL_EXPORT vtkBox : public vtkImplicitFunction
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{
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public:
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vtkTypeMacro(vtkBox,vtkImplicitFunction);
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void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
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/**
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* Construct box with center at (0,0,0) and each side of length 1.0.
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*/
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static vtkBox *New();
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/**
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* Evaluate box defined by the two points (pMin,pMax).
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*/
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double EvaluateFunction(double x[3]) VTK_OVERRIDE;
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double EvaluateFunction(double x, double y, double z)
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{return this->vtkImplicitFunction::EvaluateFunction(x, y, z); }
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/**
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* Evaluate the gradient of the box.
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*/
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void EvaluateGradient(double x[3], double n[3]) VTK_OVERRIDE;
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//@{
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/**
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* Set / get the bounding box using various methods.
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*/
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void SetXMin(double p[3]);
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void SetXMin(double x, double y, double z);
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void GetXMin(double p[3]);
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void GetXMin(double &x, double &y, double &z);
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//@}
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void SetXMax(double p[3]);
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void SetXMax(double x, double y, double z);
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void GetXMax(double p[3]);
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void GetXMax(double &x, double &y, double &z);
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void SetBounds(double xMin, double xMax,
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double yMin, double yMax,
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double zMin, double zMax);
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void SetBounds(const double bounds[6]);
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void GetBounds(double &xMin, double &xMax,
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double &yMin, double &yMax,
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double &zMin, double &zMax);
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void GetBounds(double bounds[6]);
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double *GetBounds();
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/**
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* A special method that allows union set operation on bounding boxes.
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* Start with a SetBounds(). Subsequent AddBounds() methods are union set
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* operations on the original bounds. Retrieve the final bounds with a
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* GetBounds() method.
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*/
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void AddBounds(const double bounds[6]);
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/**
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* Bounding box intersection modified from Graphics Gems Vol I. The method
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* returns a non-zero value if the bounding box is hit. Origin[3] starts
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* the ray, dir[3] is the vector components of the ray in the x-y-z
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* directions, coord[3] is the location of hit, and t is the parametric
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* coordinate along line. (Notes: the intersection ray dir[3] is NOT
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* normalized. Valid intersections will only occur between 0<=t<=1.)
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*/
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static char IntersectBox(double bounds[6], double origin[3], double dir[3],
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double coord[3], double& t);
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/**
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* Intersect a line with the box. Give the endpoints of the line in
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* p1 and p2. The parameteric distances from p1 to the entry and exit
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* points are returned in t1 and t2, where t1 and t2 are clamped to the
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* range [0,1]. The entry and exit planes are returned in plane1 and
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* plane2 where integers (0, 1, 2, 3, 4, 5) stand for the
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* (xmin, xmax, ymin, ymax, zmin, zmax) planes respectively, and a value
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* of -1 means that no intersection occurred. The actual intersection
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* coordinates are stored in x1 and x2, which can be set to NULL of you
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* do not need them to be returned. The function return value will be
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* zero if the line is wholly outside of the box.
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*/
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static int IntersectWithLine(const double bounds[6],
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const double p1[3], const double p2[3],
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double &t1, double &t2,
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double x1[3], double x2[3],
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int &plane1, int &plane2);
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protected:
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vtkBox();
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~vtkBox() VTK_OVERRIDE;
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vtkBoundingBox *BBox;
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double Bounds[6]; //supports the GetBounds() method
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private:
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vtkBox(const vtkBox&) VTK_DELETE_FUNCTION;
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void operator=(const vtkBox&) VTK_DELETE_FUNCTION;
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};
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inline void vtkBox::SetXMin(double p[3])
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{
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this->SetXMin(p[0], p[1], p[2]);
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}
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inline void vtkBox::SetXMax(double p[3])
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{
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this->SetXMax(p[0], p[1], p[2]);
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}
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#endif
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