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-- File: Poly.cdl
-- Created: Mon Mar 6 09:38:50 1995
-- Author: Laurent PAINNOT
-- <lpa@metrox>
---Copyright: Matra Datavision 1995
package Poly
---Purpose: This package provides classes and services to
-- handle :
--
-- * 3D triangular polyhedrons.
--
-- * 3D polygons.
--
-- * 2D polygon.
--
-- * Tools to dump, save and restore those objects.
uses
MMgt,
TCollection,
TColStd,
gp,
TColgp,
TShort
is
class Triangle;
---Purpose: A triangle is a triplet of integers (indices of
-- the nodes).
class Array1OfTriangle
instantiates Array1 from TCollection(Triangle from Poly);
class HArray1OfTriangle
instantiates HArray1 from TCollection(Triangle from Poly,
Array1OfTriangle from Poly);
class Triangulation;
---Purpose: A Triangulation is a 3D polyhedron made of
-- triangles. It is made of a nodes which are
-- indexed. Nodes have a 3d value and a 2d value.
-- Triangles are triplet of node indices.
--
-- This is a Transient class.
class Polygon3D;
---Purpose: A Polygon3D is made of indexed nodes.
-- Nodes have a 3d value.
class Polygon2D;
---Purpose: A Polygon2D is made of indexed nodes.
-- Nodes have a 2d value.
class PolygonOnTriangulation;
---Purpose: A polygonOnTriangulation is made of node indices
-- referencing a triangulation.
--
-- Tools to use triangulations
--
class Connect;
---Purpose: Computes and stores the link from nodes to
-- triangles and from triangles to neighbouring
-- triangles.
-- This tool is obsolete, replaced by Poly_CoherentTriangulation
--
-- Data types for the Coherent Triangulation data model
--
imported CogerentTriangulation;
imported CoherentTriangle;
imported CoherentNode;
imported CoherentLink;
imported CoherentTriPtr;
imported ListOfTriangulation;
imported MakeLoops;
---Purpose: Algorithm to make minimal loops in a graph
--
-- Package methods
--
Catenate (lstTri: ListOfTriangulation from Poly)
returns Triangulation from Poly;
---Purpose: Join several triangulations to one new triangulation object.
-- The new triangulation is just a mechanical sum of input
-- triangulations, without node sharing. UV coordinates are
-- dropped in the result.
Write(T : Triangulation from Poly;
OS : in out OStream;
Compact : Boolean = Standard_True);
---Purpose: Writes the content of the triangulation <T> on the
-- stream <OS>. If <Compact> is true this is a "save"
-- format intended to be read back with the Read
-- method. If compact is False it is a "Dump" format
-- intended to be informative.
Write(P : Polygon3D from Poly;
OS : in out OStream;
Compact : Boolean = Standard_True);
---Purpose: Writes the content of the 3D polygon <P> on the
-- stream <OS>. If <Compact> is true this is a "save"
-- format intended to be read back with the Read
-- method. If compact is False it is a "Dump" format
-- intended to be informative.
Write(P : Polygon2D from Poly;
OS : in out OStream;
Compact : Boolean = Standard_True);
---Purpose: Writes the content of the 2D polygon <P> on the
-- stream <OS>. If <Compact> is true this is a "save"
-- format intended to be read back with the Read
-- method. If compact is False it is a "Dump" format
-- intended to be informative.
Dump(T : Triangulation from Poly;
OS : in out OStream);
---Purpose: Dumps the triangulation. This is a call to the
-- previous method with Comapct set to False.
Dump(P : Polygon3D from Poly;
OS : in out OStream);
---Purpose: Dumps the 3D polygon. This is a call to the
-- previous method with Comapct set to False.
Dump(P : Polygon2D from Poly;
OS : in out OStream);
---Purpose: Dumps the 2D polygon. This is a call to the
-- previous method with Comapct set to False.
ReadTriangulation(IS : in out IStream)
returns Triangulation from Poly;
---Purpose: Reads a triangulation from the stream <IS>.
ReadPolygon3D(IS : in out IStream)
returns Polygon3D from Poly;
---Purpose: Reads a 3d polygon from the stream <IS>.
ReadPolygon2D(IS : in out IStream)
returns Polygon2D from Poly;
---Purpose: Reads a 2D polygon from the stream <IS>.
ComputeNormals(Tri : Triangulation from Poly);
---Purpose: Compute node normals for face triangulation
-- as mean normal of surrounding triangles
PointOnTriangle(P1, P2, P3, P: XY from gp; UV: out XY from gp)
returns Real;
---Purpose: Computes parameters of the point P on triangle
-- defined by points P1, P2, and P3, in 2d.
-- The parameters U and V are defined so that
-- P = P1 + U * (P2 - P1) + V * (P3 - P1),
-- with U >= 0, V >= 0, U + V <= 1.
-- If P is located outside of triangle, or triangle
-- is degenerated, the returned parameters correspond
-- to closest point, and returned value is square of
-- the distance from original point to triangle (0 if
-- point is inside).
end Poly;
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