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87 lines
3.5 KiB
Plaintext
Executable File
87 lines
3.5 KiB
Plaintext
Executable File
-- Created on: 1995-03-09
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-- Created by: Laurent PAINNOT
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-- Copyright (c) 1995-1999 Matra Datavision
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-- Copyright (c) 1999-2012 OPEN CASCADE SAS
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--
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-- The content of this file is subject to the Open CASCADE Technology Public
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-- License Version 6.5 (the "License"). You may not use the content of this file
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-- except in compliance with the License. Please obtain a copy of the License
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-- at http://www.opencascade.org and read it completely before using this file.
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--
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-- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
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-- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
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--
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-- The Original Code and all software distributed under the License is
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-- distributed on an "AS IS" basis, without warranty of any kind, and the
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-- Initial Developer hereby disclaims all such warranties, including without
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-- limitation, any warranties of merchantability, fitness for a particular
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-- purpose or non-infringement. Please see the License for the specific terms
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-- and conditions governing the rights and limitations under the License.
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class Polygon2D from Poly inherits TShared from MMgt
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---Purpose: Provides a polygon in 2D space (for example, in the
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-- parametric space of a surface). It is generally an
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-- approximate representation of a curve.
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-- A Polygon2D is defined by a table of nodes. Each node is
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-- a 2D point. If the polygon is closed, the point of closure is
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-- repeated at the end of the table of nodes.
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uses Array1OfPnt2d from TColgp
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raises NullObject from Standard
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is
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Create(Nodes: Array1OfPnt2d from TColgp)
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returns mutable Polygon2D from Poly;
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---Purpose: Constructs a 2D polygon defined by the table of points, <Nodes>.
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Deflection(me) returns Real;
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---Purpose: Returns the deflection of this polygon.
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-- Deflection is used in cases where the polygon is an
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-- approximate representation of a curve. Deflection
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-- represents the maximum distance permitted between any
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-- point on the curve and the corresponding point on the polygon.
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-- By default the deflection value is equal to 0. An algorithm
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-- using this 2D polygon with a deflection value equal to 0
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-- considers that it is working with a true polygon and not with
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-- an approximate representation of a curve. The Deflection
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-- function is used to modify the deflection value of this polygon.
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-- The deflection value can be used by any algorithm working with 2D polygons.
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-- For example:
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-- - An algorithm may use a unique deflection value for all
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-- its polygons. In this case it is not necessary to use the
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-- Deflection function.
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-- - Or an algorithm may want to attach a different
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-- deflection to each polygon. In this case, the Deflection
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-- function is used to set a value on each polygon, and
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-- later to fetch the value.
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Deflection(me : mutable; D : Real);
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---Purpose: Sets the deflection of this polygon to D
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NbNodes(me) returns Integer;
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---Purpose: Returns the number of nodes in this polygon.
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-- Note: If the polygon is closed, the point of closure is
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-- repeated at the end of its table of nodes. Thus, on a closed
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-- triangle, the function NbNodes returns 4.
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---C++: inline
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Nodes(me) returns Array1OfPnt2d from TColgp
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---Purpose: Returns the table of nodes for this polygon.
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---C++: return const &
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raises NullObject from Standard;
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fields
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myDeflection: Real;
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myNodes: Array1OfPnt2d from TColgp;
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end Polygon2D;
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