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-- File: Poly_Polygon2D.cdl
-- Created: Thu Mar 9 16:29:00 1995
-- Author: Laurent PAINNOT
-- <lpa@metrox>
---Copyright: Matra Datavision 1995
class Polygon2D from Poly inherits TShared from MMgt
---Purpose: Provides a polygon in 2D space (for example, in the
-- parametric space of a surface). It is generally an
-- approximate representation of a curve.
-- A Polygon2D is defined by a table of nodes. Each node is
-- a 2D point. If the polygon is closed, the point of closure is
-- repeated at the end of the table of nodes.
uses Array1OfPnt2d from TColgp
raises NullObject from Standard
is
Create(Nodes: Array1OfPnt2d from TColgp)
returns mutable Polygon2D from Poly;
---Purpose: Constructs a 2D polygon defined by the table of points, <Nodes>.
Deflection(me) returns Real;
---Purpose: Returns the deflection of this polygon.
-- Deflection is used in cases where the polygon is an
-- approximate representation of a curve. Deflection
-- represents the maximum distance permitted between any
-- point on the curve and the corresponding point on the polygon.
-- By default the deflection value is equal to 0. An algorithm
-- using this 2D polygon with a deflection value equal to 0
-- considers that it is working with a true polygon and not with
-- an approximate representation of a curve. The Deflection
-- function is used to modify the deflection value of this polygon.
-- The deflection value can be used by any algorithm working with 2D polygons.
-- For example:
-- - An algorithm may use a unique deflection value for all
-- its polygons. In this case it is not necessary to use the
-- Deflection function.
-- - Or an algorithm may want to attach a different
-- deflection to each polygon. In this case, the Deflection
-- function is used to set a value on each polygon, and
-- later to fetch the value.
Deflection(me : mutable; D : Real);
---Purpose: Sets the deflection of this polygon to D
NbNodes(me) returns Integer;
---Purpose: Returns the number of nodes in this polygon.
-- Note: If the polygon is closed, the point of closure is
-- repeated at the end of its table of nodes. Thus, on a closed
-- triangle, the function NbNodes returns 4.
---C++: inline
Nodes(me) returns Array1OfPnt2d from TColgp
---Purpose: Returns the table of nodes for this polygon.
---C++: return const &
raises NullObject from Standard;
fields
myDeflection: Real;
myNbNodes: Integer;
myNodes: Array1OfPnt2d from TColgp;
end Polygon2D;
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