# cee::geo::DataTriangleFan

class `DataTriangleFan` : public Data

  Data structure representing triangle strip data for a geometry part used in the GeometryModel

  A triangle fan is used to produce a group of connected triangles that fan around a central point. The first vertex forms the origin of the fan. After the first three vertices are used to draw the initial triangle, all subsequent vertices are used with the origin (V0) and the vertex immediately preceding it (Vn-1) to form the next triangle.

      Indices:    0 1 2 3 4 5 ...
      Triangles: {0 1 2}
                 {0} {2 3}
                 {0}   {3 4}
                 {0}     {4 5}

  A vertices array of length n, will generate n - 2 triangles

  See also

  GeometryModel, Part, Data, DataIndexedTriangles, and DataTriangleStrip

  Public Functions

  `DataTriangleFan`()

    Constructs an empty triangle data object.

  `DataTriangleFan`(const std::vector<Vec3d> &vertices)

    Constructs a triangles object from the specified vertices.

        std::vector<cee::Vec3d> vertices;
        vertices.push_back(cee::Vec3d(0, 0, 0));
        vertices.push_back(cee::Vec3d(1, 0, 0));
        vertices.push_back(cee::Vec3d(1, 1, 0));
        vertices.push_back(cee::Vec3d(0, 1, 0));

        cee::PtrRef<cee::geo::DataTriangleFan> triangleData = new cee::geo::DataTriangleFan(vertices);

  virtual Type `type`() const

    Returns Data::TRIANGLE_FAN.

  virtual BoundingBox `boundingBox`() const

    Returns the bounding box of the part data.

  std::vector<Vec3d> `vertices`() const

    Returns array of vertices used to build up the triangles.

    A vertices array of length n, will generate n - 2 triangles

  void `setVertices`(const std::vector<Vec3d> &vertices)

    Sets vertices of all the triangles.

  size_t `triangleCount`() const

    Returns number of triangles available.

  void `removeAll`()

    Clears all data.

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