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# vtkTriangleStrip Class Reference

`#include <vtkTriangleStrip.h>`

Inheritance diagram for vtkTriangleStrip:

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Collaboration diagram for vtkTriangleStrip:

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List of all members.

## Detailed Description

a cell that represents a triangle strip

Date:
  2002/12/26 18:24:22

Revision:
  1.63

vtkTriangleStrip is a concrete implementation of vtkCell to represent a 2D triangle strip. A triangle strip is a compact representation of triangles connected edge to edge in strip fashion. The connectivity of a triangle strip is three points defining an initial triangle, then for each additional triangle, a single point that, combined with the previous two points, defines the next triangle.

Created by:
  - Schroeder, Will

CVS contributions (if > 5%):
  - Schroeder, Will (66%)
  - Lorensen, Bill (9%)
  - Geveci, Berk (7%)

CVS logs (CVSweb):
  - .`cxx` (`/Common/vtkTriangleStrip.cxx)`
  - .`h` (`/Common/vtkTriangleStrip.h)`

Examples:
  vtkTriangleStrip (Examples)

Tests:
  vtkTriangleStrip (Tests)

Definition at line 56 of file vtkTriangleStrip.h.

## Public Types

typedef vtkCell | Superclass

## Public Methods

virtual const char * | GetClassName ()
virtual int | IsA (const char *type)
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 | GetParametricCenter (float pcoords[3])
int | GetCellType ()
int | GetCellDimension ()
int | GetNumberOfEdges ()
int | GetNumberOfFaces ()
vtkCell * | GetEdge (int edgeId)
vtkCell * | GetFace (int vtkNotUsed(faceId))
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 *polys, vtkPointData *inPd, vtkPointData *outPd, vtkCellData *inCd, vtkIdType cellId, vtkCellData *outCd, int insideOut)

## Static Public Methods

vtkTriangleStrip * | New ()
int | IsTypeOf (const char *type)
vtkTriangleStrip * | SafeDownCast (vtkObject *o)
void | DecomposeStrip (int npts, vtkIdType *pts, vtkCellArray *tris)

## Protected Methods

| vtkTriangleStrip ()
| ~vtkTriangleStrip ()

## Protected Attributes

vtkLine * | Line
vtkTriangle * | Triangle

## Member Typedef Documentation

typedef vtkCell vtkTriangleStrip::Superclass

| Reimplemented from vtkCell. Definition at line 60 of file vtkTriangleStrip.h.

## Constructor & Destructor Documentation

vtkTriangleStrip::vtkTriangleStrip | ( |  | ) | `[protected]`

vtkTriangleStrip::~vtkTriangleStrip | ( |  | ) | `[protected]`

## Member Function Documentation

vtkTriangleStrip* vtkTriangleStrip::New | ( |  | ) | `[static]`

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

virtual const char* vtkTriangleStrip::GetClassName | ( |  | ) | `[virtual]`

| Reimplemented from vtkCell.

int vtkTriangleStrip::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 vtkTriangleStrip::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.

vtkTriangleStrip* vtkTriangleStrip::SafeDownCast | ( | vtkObject * | o | ) | `[static]`

| Reimplemented from vtkCell.

int vtkTriangleStrip::GetCellType | ( |  | ) | `[inline, virtual]`

| See the vtkCell API for descriptions of these methods. Implements vtkCell. Definition at line 64 of file vtkTriangleStrip.h. References VTK_TRIANGLE_STRIP.

int vtkTriangleStrip::GetCellDimension | ( |  | ) | `[inline, virtual]`

| See the vtkCell API for descriptions of these methods. Implements vtkCell. Definition at line 65 of file vtkTriangleStrip.h.

int vtkTriangleStrip::GetNumberOfEdges | ( |  | ) | `[inline, virtual]`

| See the vtkCell API for descriptions of these methods. Implements vtkCell. Definition at line 66 of file vtkTriangleStrip.h. References vtkCell::GetNumberOfPoints().

int vtkTriangleStrip::GetNumberOfFaces | ( |  | ) | `[inline, virtual]`

| See the vtkCell API for descriptions of these methods. Implements vtkCell. Definition at line 67 of file vtkTriangleStrip.h.

vtkCell* vtkTriangleStrip::GetEdge | ( | int | edgeId | ) | `[virtual]`

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

vtkCell* vtkTriangleStrip::GetFace | ( | int | vtkNotUsed(faceId) | ) | `[inline]`

| See the vtkCell API for descriptions of these methods. Definition at line 69 of file vtkTriangleStrip.h.

int vtkTriangleStrip::CellBoundary | ( | int | subId,
|  | float | pcoords[3],
|  | vtkIdList * | pts
| ) | `[virtual]`

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

void vtkTriangleStrip::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 vtkTriangleStrip::Clip | ( | float | value,
|  | vtkDataArray * | cellScalars,
|  | vtkPointLocator * | locator,
|  | vtkCellArray * | polys,
|  | 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 vtkTriangleStrip::EvaluatePosition | ( | float | x[3],
|  | float * | closestPoint,
|  | int & | subId,
|  | float | pcoords[3],
|  | float & | dist2,
|  | float * | weights
| ) | `[virtual]`

Given a point x[3] return inside(=1) or outside(=0) cell; evaluate parametric coordinates, sub-cell id (!=0 only if cell is composite), distance squared of point x[3] to cell (in particular, the sub-cell indicated), closest point on cell to x[3] (unless closestPoint is null, in which case, the closest point and dist2 are not found), and interpolation weights in cell. (The number of weights is equal to the number of points defining the cell). Note: on rare occasions a -1 is returned from the method. This means that numerical error has occurred and all data returned from this method should be ignored. Also, inside/outside is determine parametrically. That is, a point is inside if it satisfies parametric limits. This can cause problems for cells of topological dimension 2 or less, since a point in 3D can project onto the cell within parametric limits but be "far" from the cell. Thus the value dist2 may be checked to determine true in/out.

Implements vtkCell.

void vtkTriangleStrip::EvaluateLocation | ( | int & | subId,
|  | float | pcoords[3],
|  | float | x[3],
|  | float * | weights
| ) | `[virtual]`

| Determine global coordinate (x[3]) from subId and parametric coordinates. Also returns interpolation weights. (The number of weights is equal to the number of points in the cell.) Implements vtkCell.

int vtkTriangleStrip::IntersectWithLine | ( | float | p1[3],
|  | float | p2[3],
|  | float | tol,
|  | float & | t,
|  | float | x[3],
|  | float | pcoords[3],
|  | int & | subId
| ) | `[virtual]`

| Intersect with a ray. Return parametric coordinates (both line and cell) and global intersection coordinates, given ray definition and tolerance. The method returns non-zero value if intersection occurs. Implements vtkCell.

int vtkTriangleStrip::Triangulate | ( | int | index,
|  | vtkIdList * | ptIds,
|  | vtkPoints * | pts
| ) | `[virtual]`

Generate simplices of proper dimension. If cell is 3D, tetrahedron are generated; if 2D triangles; if 1D lines; if 0D points. The form of the output is a sequence of points, each n+1 points (where n is topological cell dimension) defining a simplex. The index is a parameter that controls which triangulation to use (if more than one is possible). If numerical degeneracy encountered, 0 is returned, otherwise 1 is returned.

Implements vtkCell.

void vtkTriangleStrip::Derivatives | ( | int | subId,
|  | float | pcoords[3],
|  | float * | values,
|  | int | dim,
|  | float * | derivs
| ) | `[virtual]`

Compute derivatives given cell subId and parametric coordinates. The values array is a series of data value(s) at the cell points. There is a one-to-one correspondence between cell point and data value(s). Dim is the number of data values per cell point. Derivs are derivatives in the x-y-z coordinate directions for each data value. Thus, if computing derivatives for a scalar function in a hexahedron, dim=1, 8 values are supplied, and 3 deriv values are returned (i.e., derivatives in x-y-z directions). On the other hand, if computing derivatives of velocity (vx,vy,vz) dim=3, 24 values are supplied ((vx,vy,vz)1, (vx,vy,vz)2, ....()8), and 9 deriv values are returned ((d(vx)/dx),(d(vx)/dy),(d(vx)/dz), (d(vy)/dx),(d(vy)/dy), (d(vy)/dz), (d(vz)/dx),(d(vz)/dy),(d(vz)/dz)).

Implements vtkCell.

int vtkTriangleStrip::GetParametricCenter | ( | float | pcoords[3] | ) | `[virtual]`

| Return the center of the point cloud in parametric coordinates. Reimplemented from vtkCell.

void vtkTriangleStrip::DecomposeStrip | ( | int | npts,
|  | vtkIdType * | pts,
|  | vtkCellArray * | tris
| ) | `[static]`

| Given a triangle strip, decompose it into a list of (triangle) polygons. The polygons are appended to the end of the list of triangles.

## Member Data Documentation

vtkLine* vtkTriangleStrip::Line`[protected]`

| Definition at line 107 of file vtkTriangleStrip.h.

vtkTriangle* vtkTriangleStrip::Triangle`[protected]`

| Definition at line 108 of file vtkTriangleStrip.h.

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

- Common/vtkTriangleStrip.h