vtkPolygon Class Reference

#include <vtkPolygon.h>

Inheritance diagram for vtkPolygon:

[legend]Collaboration diagram for vtkPolygon:

[legend]List of all members.

Detailed Description

a cell that represents an n-sided polygon

vtkPolygon is a concrete implementation of vtkCell to represent a 2D n-sided polygon. The polygons cannot have any internal holes, and cannot self-intersect. Define the polygon with n-points ordered in the clockwise direction; do not repeat the last point.

Examples:: vtkPolygon (Examples)

Tests:: vtkPolygon (Tests)

Definition at line 41 of file vtkPolygon.h.

Public Types

typedef vtkCell Superclass

Public Member Functions

virtual const char * GetClassName ()

virtual int IsA (const char *type)

void ComputeWeights (double x[3], double *weights)

int Triangulate (vtkIdList *outTris)

int GetCellType ()

int GetCellDimension ()

int GetNumberOfEdges ()

int GetNumberOfFaces ()

vtkCell * GetEdge (int edgeId)

vtkCell * GetFace (int)

int CellBoundary (int subId, double pcoords[3], vtkIdList *pts)

void Contour (double value, vtkDataArray *cellScalars, vtkPointLocator *locator, vtkCellArray *verts, vtkCellArray *lines, vtkCellArray *polys, vtkPointData *inPd, vtkPointData *outPd, vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd)

void Clip (double value, vtkDataArray *cellScalars, vtkPointLocator *locator, vtkCellArray *tris, vtkPointData *inPd, vtkPointData *outPd, vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd, int insideOut)

int EvaluatePosition (double x[3], double *closestPoint, int &subId, double pcoords[3], double &dist2, double *weights)

void EvaluateLocation (int &subId, double pcoords[3], double x[3], double *weights)

int IntersectWithLine (double p1[3], double p2[3], double tol, double &t, double x[3], double pcoords[3], int &subId)

int Triangulate (int index, vtkIdList *ptIds, vtkPoints *pts)

void Derivatives (int subId, double pcoords[3], double *values, int dim, double *derivs)

int IsPrimaryCell ()

int ParameterizePolygon (double p0[3], double p10[3], double &l10, double p20[3], double &l20, double n[3])

Static Public Member Functions

vtkPolygon * New ()

int IsTypeOf (const char *type)

vtkPolygon * SafeDownCast (vtkObject *o)

void ComputeNormal (int numPts, double *pts, double n[3])

void ComputeNormal (vtkPoints *p, int numPts, vtkIdType *pts, double n[3])

void ComputeNormal (vtkPoints *p, double n[3])

int PointInPolygon (double x[3], int numPts, double *pts, double bounds[6], double n[3])

int IntersectPolygonWithPolygon (int npts, double *pts, double bounds[6], int npts2, double *pts2, double bounds2[3], double tol, double x[3])

Protected Member Functions

vtkPolygon ()

~vtkPolygon ()

int EarCutTriangulation ()

Protected Attributes

double Tolerance

int SuccessfulTriangulation

double Normal [3]

vtkIdList * Tris

vtkTriangle * Triangle

vtkQuad * Quad

vtkDoubleArray * TriScalars

vtkLine * Line

Member Typedef Documentation

typedef vtkCell vtkPolygon::Superclass

Reimplemented from vtkCell.
Definition at line 45 of file vtkPolygon.h.

Constructor & Destructor Documentation

vtkPolygon::vtkPolygon ( ) [protected]

vtkPolygon::~vtkPolygon ( ) [protected]

Member Function Documentation

vtkPolygon* vtkPolygon::New ( ) [static]

Create an object with Debug turned off, modified time initialized to zero, and reference counting on.
Reimplemented from vtkObject.

virtual const char* vtkPolygon::GetClassName ( ) [virtual]

Reimplemented from vtkCell.

int vtkPolygon::IsTypeOf ( const char * type ) [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.
Reimplemented from vtkCell.

virtual int vtkPolygon::IsA ( const char * type ) [virtual]

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.
Reimplemented from vtkCell.

vtkPolygon* vtkPolygon::SafeDownCast ( vtkObject * o ) [static]

Reimplemented from vtkCell.

int vtkPolygon::GetCellType ( ) [inline, virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.
Definition at line 49 of file vtkPolygon.h.
References VTK_POLYGON.

int vtkPolygon::GetCellDimension ( ) [inline, virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.
Definition at line 50 of file vtkPolygon.h.

int vtkPolygon::GetNumberOfEdges ( ) [inline, virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.
Definition at line 51 of file vtkPolygon.h.
References vtkCell::GetNumberOfPoints().

int vtkPolygon::GetNumberOfFaces ( ) [inline, virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.
Definition at line 52 of file vtkPolygon.h.

vtkCell* vtkPolygon::GetEdge ( int edgeId ) [virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.

vtkCell* vtkPolygon::GetFace ( int ) [inline, virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.
Definition at line 54 of file vtkPolygon.h.

int vtkPolygon::CellBoundary ( int subId,

double pcoords[3],

vtkIdList * pts

) [virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.

void vtkPolygon::Contour ( double value,

vtkDataArray * cellScalars,

vtkPointLocator * locator,

vtkCellArray * verts,

vtkCellArray * lines,

vtkCellArray * polys,

vtkPointData * inPd,

vtkPointData * outPd,

vtkCellData * inCd,

vtkIdType cellId,

vtkCellData * outCd

) [virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.

void vtkPolygon::Clip ( double value,

vtkDataArray * cellScalars,

vtkPointLocator * locator,

vtkCellArray * tris,

vtkPointData * inPd,

vtkPointData * outPd,

vtkCellData * inCd,

vtkIdType cellId,

vtkCellData * outCd,

int insideOut

) [virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.

int vtkPolygon::EvaluatePosition ( double x[3],

double * closestPoint,

int & subId,

double pcoords[3],

double & dist2,

double * weights

) [virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.

void vtkPolygon::EvaluateLocation ( int & subId,

double pcoords[3],

double x[3],

double * weights

) [virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.

int vtkPolygon::IntersectWithLine ( double p1[3],

double p2[3],

double tol,

double & t,

double x[3],

double pcoords[3],

int & subId

) [virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.

int vtkPolygon::Triangulate ( int index,

vtkIdList * ptIds,

vtkPoints * pts

) [virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.

void vtkPolygon::Derivatives ( int subId,

double pcoords[3],

double * values,

int dim,

double * derivs

) [virtual]

See the vtkCell API for descriptions of these methods.
Implements vtkCell.

int vtkPolygon::IsPrimaryCell ( ) [inline, virtual]

See the vtkCell API for descriptions of these methods.
Reimplemented from vtkCell.
Definition at line 76 of file vtkPolygon.h.

void vtkPolygon::ComputeNormal ( vtkPoints * p,

int numPts,

vtkIdType * pts,

double n[3]

) [static]

Polygon specific methods.

void vtkPolygon::ComputeNormal ( vtkPoints * p,

double n[3]

) [static]

Polygon specific methods.

void vtkPolygon::ComputeNormal ( int numPts,

double * pts,

double n[3]

) [static]

Compute the polygon normal from an array of points. This version assumes that the polygon is convex, and looks for the first valid normal.

void vtkPolygon::ComputeWeights ( double x[3],

double * weights

)

Compute interpolation weights using 1/r**2 normalized sum.

int vtkPolygon::ParameterizePolygon ( double p0[3],

double p10[3],

double & l10,

double p20[3],

double & l20,

double n[3]

)

Create a local s-t coordinate system for a polygon. The point p0 is the origin of the local system, p10 is s-axis vector, and p20 is the t-axis vector. (These are expressed in the modeling coordinate system and are vectors of dimension [3].) The values l20 and l20 are the lengths of the vectors p10 and p20, and n is the polygon normal.

int vtkPolygon::PointInPolygon ( double x[3],

int numPts,

double * pts,

double bounds[6],

double n[3]

) [static]

Determine whether point is inside polygon. Function uses ray-casting to determine if point is inside polygon. Works for arbitrary polygon shape (e.g., non-convex). Returns 0 if point is not in polygon; 1 if it is. Can also return -1 to indicate degenerate polygon.

int vtkPolygon::Triangulate ( vtkIdList * outTris )

Triangulate this polygon. The user must provide the vtkIdList outTris. On output, the outTris list contains the ids of the points defining the triangulation. The ids are ordered into groups of three: each three-group defines one triangle.

int vtkPolygon::IntersectPolygonWithPolygon ( int npts,

double * pts,

double bounds[6],

int npts2,

double * pts2,

double bounds2[3],

double tol,

double x[3]

) [static]

Method intersects two polygons. You must supply the number of points and point coordinates (npts, *pts) and the bounding box (bounds) of the two polygons. Also supply a tolerance squared for controlling error. The method returns 1 if there is an intersection, and 0 if not. A single point of intersection x[3] is also returned if there is an intersection.

int vtkPolygon::EarCutTriangulation ( ) [protected]

A fast triangulation method. Uses recursive divide and conquer based on plane splitting to reduce loop into triangles. The cell (e.g., triangle) is presumed properly initialized (i.e., Points and PointIds).

Member Data Documentation

double vtkPolygon::Tolerance [protected]

Definition at line 138 of file vtkPolygon.h.

int vtkPolygon::SuccessfulTriangulation [protected]

Definition at line 139 of file vtkPolygon.h.

double vtkPolygon::Normal[3] [protected]

Definition at line 140 of file vtkPolygon.h.

vtkIdList* vtkPolygon::Tris [protected]

Definition at line 141 of file vtkPolygon.h.

vtkTriangle* vtkPolygon::Triangle [protected]

Definition at line 142 of file vtkPolygon.h.

vtkQuad* vtkPolygon::Quad [protected]

Definition at line 143 of file vtkPolygon.h.

vtkDoubleArray* vtkPolygon::TriScalars [protected]

Definition at line 144 of file vtkPolygon.h.

vtkLine* vtkPolygon::Line [protected]

Definition at line 145 of file vtkPolygon.h.

The documentation for this class was generated from the following file:

Common/vtkPolygon.h


Public Types
typedef vtkCell	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	ComputeWeights (double x[3], double *weights)
int	Triangulate (vtkIdList *outTris)

int	GetCellType ()
int	GetCellDimension ()
int	GetNumberOfEdges ()
int	GetNumberOfFaces ()
vtkCell *	GetEdge (int edgeId)
vtkCell *	GetFace (int)
int	CellBoundary (int subId, double pcoords[3], vtkIdList *pts)
void	Contour (double value, vtkDataArray cellScalars, vtkPointLocator locator, vtkCellArray verts, vtkCellArray lines, vtkCellArray polys, vtkPointData inPd, vtkPointData outPd, vtkCellData inCd, vtkIdType cellId, vtkCellData *outCd)
void	Clip (double value, vtkDataArray cellScalars, vtkPointLocator locator, vtkCellArray tris, vtkPointData inPd, vtkPointData outPd, vtkCellData inCd, vtkIdType cellId, vtkCellData *outCd, int insideOut)
int	EvaluatePosition (double x[3], double closestPoint, int &subId, double pcoords[3], double &dist2, double weights)
void	EvaluateLocation (int &subId, double pcoords[3], double x[3], double *weights)
int	IntersectWithLine (double p1[3], double p2[3], double tol, double &t, double x[3], double pcoords[3], int &subId)
int	Triangulate (int index, vtkIdList ptIds, vtkPoints pts)
void	Derivatives (int subId, double pcoords[3], double values, int dim, double derivs)
int	IsPrimaryCell ()

int	ParameterizePolygon (double p0[3], double p10[3], double &l10, double p20[3], double &l20, double n[3])
Static Public Member Functions
vtkPolygon *	New ()
int	IsTypeOf (const char *type)
vtkPolygon *	SafeDownCast (vtkObject *o)
void	ComputeNormal (int numPts, double *pts, double n[3])

void	ComputeNormal (vtkPoints p, int numPts, vtkIdType pts, double n[3])
void	ComputeNormal (vtkPoints *p, double n[3])

int	PointInPolygon (double x[3], int numPts, double *pts, double bounds[6], double n[3])

int	IntersectPolygonWithPolygon (int npts, double pts, double bounds[6], int npts2, double pts2, double bounds2[3], double tol, double x[3])
Protected Member Functions
	vtkPolygon ()
	~vtkPolygon ()
int	EarCutTriangulation ()
Protected Attributes
double	Tolerance
int	SuccessfulTriangulation
double	Normal [3]
vtkIdList *	Tris
vtkTriangle *	Triangle
vtkQuad *	Quad
vtkDoubleArray *	TriScalars
vtkLine *	Line