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-- File: Poly_Triangulation.cdl
-- Created: Mon Mar 6 09:57:02 1995
-- Author: Laurent PAINNOT
-- <lpa@metrox>
---Copyright: Matra Datavision 1995
class Triangulation from Poly inherits TShared from MMgt
---Purpose: Provides a triangulation for a surface, a set of surfaces, or
-- more generally a shape.
-- A triangulation consists of an approximate representation
-- of the actual shape, using a collection of points and
-- triangles. The points are located on the surface. The
-- edges of the triangles connect adjacent points with a
-- straight line that approximates the true curve on the surface.
-- A triangulation comprises:
-- - A table of 3D nodes (3D points on the surface).
-- - A table of triangles. Each triangle (Poly_Triangle
-- object) comprises a triplet of indices in the table of 3D
-- nodes specific to the triangulation.
-- - A table of 2D nodes (2D points), parallel to the table of
-- 3D nodes. This table is optional. If it exists, the
-- coordinates of a 2D point are the (u, v) parameters
-- of the corresponding 3D point on the surface
-- approximated by the triangulation.
-- - A deflection (optional), which maximizes the distance
-- from a point on the surface to the corresponding point
-- on its approximate triangulation.
-- In many cases, algorithms do not need to work with the
-- exact representation of a surface. A triangular
-- representation induces simpler and more robust adjusting,
-- faster performances, and the results are as good.
uses
HArray1OfPnt2d from TColgp,
Array1OfPnt from TColgp,
Array1OfPnt2d from TColgp,
Array1OfTriangle from Poly,
HArray1OfShortReal from TShort,
Array1OfShortReal from TShort
raises
DomainError from Standard,
NullObject from Standard
is
Create(nbNodes, nbTriangles: Integer; UVNodes: Boolean)
returns mutable Triangulation from Poly;
---Purpose: Constructs a triangulation from a set of triangles. The
-- triangulation is initialized without a triangle or a node, but capable of
-- containing nbNodes nodes, and nbTriangles
-- triangles. Here the UVNodes flag indicates whether
-- 2D nodes will be associated with 3D ones, (i.e. to
-- enable a 2D representation).
Create(Nodes: Array1OfPnt from TColgp;
Triangles: Array1OfTriangle from Poly)
returns mutable Triangulation from Poly;
---Purpose: Constructs a triangulation from a set of triangles. The
-- triangulation is initialized with 3D points from Nodes and triangles
-- from Triangles.
Create(Nodes: Array1OfPnt from TColgp;
UVNodes: Array1OfPnt2d from TColgp;
Triangles: Array1OfTriangle from Poly)
returns mutable Triangulation from Poly;
---Purpose: Constructs a triangulation from a set of triangles. The
-- triangulation is initialized with 3D points from Nodes, 2D points from
-- UVNodes and triangles from Triangles, where
-- coordinates of a 2D point from UVNodes are the
-- (u, v) parameters of the corresponding 3D point
-- from Nodes on the surface approximated by the
-- constructed triangulation.
Deflection(me) returns Real;
---Purpose: Returns the deflection of this triangulation.
Deflection(me : mutable; D : Real);
---Purpose: Sets the deflection of this triangulation to D.
-- See more on deflection in Polygon2D
RemoveUVNodes(me : mutable);
---Purpose: Deallocates the UV nodes.
NbNodes(me) returns Integer;
---Purpose: Returns the number of nodes for this triangulation.
-- Null if the nodes are not yet defined.
---C++: inline
NbTriangles(me) returns Integer;
---Purpose: Returns the number of triangles for this triangulation.
-- Null if the Triangles are not yet defined.
---C++: inline
HasUVNodes(me) returns Boolean;
---Purpose: Returns true if 2D nodes are associated with 3D nodes for
-- this triangulation.
---C++: inline
Nodes(me) returns Array1OfPnt from TColgp
---Purpose: Returns the table of 3D nodes (3D points) for this triangulation.
---C++: return const &
raises NullObject from Standard;
ChangeNodes(me : mutable) returns Array1OfPnt from TColgp
---Purpose: Returns the table of 3D nodes (3D points) for this triangulation.
-- The returned array is
-- shared. Therefore if the table is selected by reference, you
-- can, by simply modifying it, directly modify the data
-- structure of this triangulation.
---C++: return &
raises NullObject from Standard;
UVNodes(me) returns Array1OfPnt2d from TColgp
---Purpose: Returns the table of 2D nodes (2D points) associated with
-- each 3D node of this triangulation.
-- The function HasUVNodes checks if 2D nodes
-- are associated with the 3D nodes of this triangulation.
-- Const reference on the 2d nodes values.
---C++: return const &
raises NullObject from Standard;
ChangeUVNodes(me : mutable) returns Array1OfPnt2d from TColgp
---Purpose: Returns the table of 2D nodes (2D points) associated with
-- each 3D node of this triangulation.
-- Function ChangeUVNodes shares the returned array.
-- Therefore if the table is selected by reference,
-- you can, by simply modifying it, directly modify the data
-- structure of this triangulation.
---C++: return &
raises NullObject from Standard;
Triangles(me) returns Array1OfTriangle from Poly
---Purpose: Returns the table of triangles for this triangulation.
---C++: return const &
raises NullObject from Standard;
ChangeTriangles(me : mutable) returns Array1OfTriangle from Poly
---Purpose: Returns the table of triangles for this triangulation.
-- Function ChangeUVNodes shares the returned array.
-- Therefore if the table is selected by reference,
-- you can, by simply modifying it, directly modify the data
-- structure of this triangulation.
---C++: return &
raises NullObject from Standard;
SetNormals(me : mutable; theNormals : HArray1OfShortReal from TShort)
---Purpose: Sets the table of node normals.
-- raises exception if length of theNormals != 3*NbNodes
raises DomainError from Standard;
Normals(me) returns Array1OfShortReal from TShort
---C++: return const &
-- raises exception if array of normals is empty or
-- its length != 3*NbNodes
raises NullObject from Standard;
ChangeNormals(me : mutable) returns Array1OfShortReal from TShort
---C++: return &
-- raises exception if array of normals is empty or
-- its length != 3*NbNodes
raises NullObject from Standard;
HasNormals(me) returns Boolean from Standard;
fields
myDeflection : Real;
myNbNodes : Integer;
myNbTriangles : Integer;
myNodes : Array1OfPnt from TColgp;
myUVNodes : HArray1OfPnt2d from TColgp;
myTriangles : Array1OfTriangle from Poly;
---- Optional normals ---
myNormals : HArray1OfShortReal from TShort;
end Triangulation;
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