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vtkPolygon Class Reference

#include <vtkPolygon.h>

Inheritance diagram for vtkPolygon:

vtkCell vtkObject vtkObjectBase List of all members.

Detailed Description

a cell that represents an n-sided polygon

Date
2002/12/26 18:24:21
Revision
1.74

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 45 of file vtkPolygon.h.

Public Types

typedef vtkCell Superclass

Public Member Functions

virtual const char * GetClassName ()
virtual int IsA (const char *type)
void ComputeWeights (float x[3], float *weights)
int Triangulate (vtkIdList *outTris)
int GetCellType ()
int GetCellDimension ()
int GetNumberOfEdges ()
int GetNumberOfFaces ()
vtkCellGetEdge (int edgeId)
vtkCellGetFace (int)
int CellBoundary (int subId, float pcoords[3], vtkIdList *pts)
void Contour (float value, vtkDataArray *cellScalars, vtkPointLocator *locator, vtkCellArray *verts, vtkCellArray *lines, vtkCellArray *polys, vtkPointData *inPd, vtkPointData *outPd, vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd)
void Clip (float value, vtkDataArray *cellScalars, vtkPointLocator *locator, vtkCellArray *tris, vtkPointData *inPd, vtkPointData *outPd, vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd, int insideOut)
int EvaluatePosition (float x[3], float *closestPoint, int &subId, float pcoords[3], float &dist2, float *weights)
void EvaluateLocation (int &subId, float pcoords[3], float x[3], float *weights)
int IntersectWithLine (float p1[3], float p2[3], float tol, float &t, float x[3], float pcoords[3], int &subId)
int Triangulate (int index, vtkIdList *ptIds, vtkPoints *pts)
void Derivatives (int subId, float pcoords[3], float *values, int dim, float *derivs)
int ParameterizePolygon (float p0[3], float p10[3], float &l10, float p20[3], float &l20, float n[3])

Static Public Member Functions

static vtkPolygonNew ()
static int IsTypeOf (const char *type)
static vtkPolygonSafeDownCast (vtkObject *o)
static void ComputeNormal (int numPts, float *pts, float n[3])
static void ComputeNormal (vtkPoints *p, int numPts, vtkIdType *pts, float n[3])
static void ComputeNormal (vtkPoints *p, float n[3])
static int PointInPolygon (float x[3], int numPts, float *pts, float bounds[6], float n[3])
static int IntersectPolygonWithPolygon (int npts, float *pts, float bounds[6], int npts2, float *pts2, float bounds2[3], float tol, float x[3])

Protected Member Functions

 vtkPolygon ()
 ~vtkPolygon ()
int EarCutTriangulation ()

Protected Attributes

float Tolerance
int SuccessfulTriangulation
float Normal [3]
vtkIdListTris
vtkTriangleTriangle
vtkQuadQuad
vtkFloatArrayTriScalars
vtkLineLine


Member Typedef Documentation

typedef vtkCell vtkPolygon::Superclass
 

Reimplemented from vtkCell.

Definition at line 49 of file vtkPolygon.h.


Constructor & Destructor Documentation

vtkPolygon::vtkPolygon  )  [protected]
 

vtkPolygon::~vtkPolygon  )  [protected]
 


Member Function Documentation

static 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.

static 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.

static 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 53 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 54 of file vtkPolygon.h.

int vtkPolygon::GetNumberOfEdges  )  [inline, virtual]
 

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

Definition at line 55 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 56 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 58 of file vtkPolygon.h.

int vtkPolygon::CellBoundary int  subId,
float  pcoords[3],
vtkIdList pts
[virtual]
 

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

void vtkPolygon::Contour float  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 float  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 float  x[3],
float *  closestPoint,
int &  subId,
float  pcoords[3],
float &  dist2,
float *  weights
[virtual]
 

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

void vtkPolygon::EvaluateLocation int &  subId,
float  pcoords[3],
float  x[3],
float *  weights
[virtual]
 

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

int vtkPolygon::IntersectWithLine float  p1[3],
float  p2[3],
float  tol,
float &  t,
float  x[3],
float  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,
float  pcoords[3],
float *  values,
int  dim,
float *  derivs
[virtual]
 

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

static void vtkPolygon::ComputeNormal vtkPoints p,
int  numPts,
vtkIdType pts,
float  n[3]
[static]
 

Polygon specific methods.

static void vtkPolygon::ComputeNormal vtkPoints p,
float  n[3]
[static]
 

Polygon specific methods.

static void vtkPolygon::ComputeNormal int  numPts,
float *  pts,
float  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 float  x[3],
float *  weights
 

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

int vtkPolygon::ParameterizePolygon float  p0[3],
float  p10[3],
float &  l10,
float  p20[3],
float &  l20,
float  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.

static int vtkPolygon::PointInPolygon float  x[3],
int  numPts,
float *  pts,
float  bounds[6],
float  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.

static int vtkPolygon::IntersectPolygonWithPolygon int  npts,
float *  pts,
float  bounds[6],
int  npts2,
float *  pts2,
float  bounds2[3],
float  tol,
float  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

float vtkPolygon::Tolerance [protected]
 

Definition at line 141 of file vtkPolygon.h.

int vtkPolygon::SuccessfulTriangulation [protected]
 

Definition at line 142 of file vtkPolygon.h.

float vtkPolygon::Normal[3] [protected]
 

Definition at line 143 of file vtkPolygon.h.

vtkIdList* vtkPolygon::Tris [protected]
 

Definition at line 144 of file vtkPolygon.h.

vtkTriangle* vtkPolygon::Triangle [protected]
 

Definition at line 145 of file vtkPolygon.h.

vtkQuad* vtkPolygon::Quad [protected]
 

Definition at line 146 of file vtkPolygon.h.

vtkFloatArray* vtkPolygon::TriScalars [protected]
 

Definition at line 147 of file vtkPolygon.h.

vtkLine* vtkPolygon::Line [protected]
 

Definition at line 148 of file vtkPolygon.h.


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