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-- File: ShapeAnalysis_FreeBounds.cdl
-- Created: Wed Jun 3 12:07:11 1998
-- Author: Daniel RISSER
-- <dan@sgi100>
---Copyright: Matra Datavision 1998
-- Modified Mon Sep 14 10:20:25 1998 by Roman LYGIN (rln)
-- 1. Analysis of actual free bounds of the shells.
-- 2. Options to extract closed sub-wires out of closed and open
-- wires
-- 3. Improved algorithm for connecting free edges into wires
class FreeBounds from ShapeAnalysis
---Purpose: This class is intended to output free bounds of the shape
-- (free bounds are the wires consisting of edges referenced by the
-- only face).
-- This class works on two distinct types of shapes when analyzing
-- their free bounds:
-- 1. compound of faces.
-- Analyzer of sewing algorithm (BRepAlgo_Sewing) is used for
-- for forecasting free bounds that would be obtained after
-- performing sewing
-- 2. compound of shells.
-- Actual free bounds (edges shared by the only face in the shell)
-- are output in this case. ShapeAnalysis_Shell is used for that.
--
-- When connecting edges into the wires algorithm tries to build
-- wires of maximum length. Two options are provided for a user
-- to extract closed sub-contours out of closed and/or open contours.
--
-- Free bounds are returned as two compounds, one for closed and one
-- for open wires.
--
-- This class also provides some static methods for advanced use:
-- connecting edges/wires to wires, extracting closed sub-wires out
-- of wires, dispatching wires into compounds for closed and open
-- wires.
-- NOTE. Ends of the edge or wire mean hereafter their end vertices.
uses
Shape from TopoDS,
Vertex from TopoDS,
Wire from TopoDS,
Compound from TopoDS,
HSequenceOfShape from TopTools,
DataMapOfShapeShape from TopTools,
HArray1OfShape from TopTools
is
Create returns FreeBounds from ShapeAnalysis;
---Purpose: Empty constructor
Create (shape : Shape from TopoDS;
toler : Real;
splitclosed: Boolean = Standard_False;
splitopen : Boolean = Standard_True)
returns FreeBounds from ShapeAnalysis;
---Purpose: Builds forecasting free bounds of the <shape>.
-- <shape> should be a compound of faces.
-- This constructor is to be used for forecasting free edges
-- with help of sewing analyzer BRepAlgo_Sewing which is called
-- with tolerance <toler>.
-- Free edges are connected into wires only when their ends are
-- at distance less than <toler>.
-- If <splitclosed> is True extracts closed sub-wires out of
-- built closed wires.
-- If <splitopen> is True extracts closed sub-wires out of
-- built open wires.
Create (shape : Shape from TopoDS;
splitclosed: Boolean = Standard_False;
splitopen : Boolean = Standard_True;
checkinternaledges : Boolean = Standard_False)
returns FreeBounds from ShapeAnalysis;
---Purpose: Builds actual free bounds of the <shape>.
-- <shape> should be a compound of shells.
-- This constructor is to be used for getting free edges (ones
-- referenced by the only face) with help of analyzer
-- ShapeAnalysis_Shell.
-- Free edges are connected into wires only when they share the
-- same vertex.
-- If <splitclosed> is True extracts closed sub-wires out of
-- built closed wires.
-- If <splitopen> is True extracts closed sub-wires out of
-- built open wires.
GetClosedWires (me) returns Compound from TopoDS;
---Purpose: Returns compound of closed wires out of free edges.
---C++: inline
---C++: return const &
GetOpenWires (me) returns Compound from TopoDS;
---Purpose: Returns compound of open wires out of free edges.
---C++: inline
---C++: return const &
---Level: Advanced
ConnectEdgesToWires (myclass; edges : in out HSequenceOfShape from TopTools;
toler : Real;
shared: Boolean;
wires : out HSequenceOfShape from TopTools);
---Purpose: Builds sequnce of <wires> out of sequence of not sorted
-- <edges>.
-- Tries to build wires of maximum length. Building a wire is
-- stopped when no edges can be connected to it at its head or
-- at its tail.
--
-- Orientation of the edge can change when connecting.
-- If <shared> is True connection is performed only when
-- adjacent edges share the same vertex.
-- If <shared> is False connection is performed only when
-- ends of adjacent edges are at distance less than <toler>.
ConnectWiresToWires (myclass; iwires: in out HSequenceOfShape from TopTools;
toler : Real;
shared: Boolean;
owires: out HSequenceOfShape from TopTools);
ConnectWiresToWires (myclass; iwires: in out HSequenceOfShape from TopTools;
toler : Real;
shared: Boolean;
owires: out HSequenceOfShape from TopTools;
vertices: out DataMapOfShapeShape
from TopTools);
---Purpose: Builds sequnce of <owires> out of sequence of not sorted
-- <iwires>.
-- Tries to build wires of maximum length. Building a wire is
-- stopped when no wires can be connected to it at its head or
-- at its tail.
--
-- Orientation of the wire can change when connecting.
-- If <shared> is True connection is performed only when
-- adjacent wires share the same vertex.
-- If <shared> is False connection is performed only when
-- ends of adjacent wires are at distance less than <toler>.
-- Map <vertices> stores the correspondence between original
-- end vertices of the wires and new connecting vertices.
SplitWires (myclass; wires : HSequenceOfShape from TopTools;
toler : Real;
shared: Boolean;
closed: out HSequenceOfShape from TopTools;
open : out HSequenceOfShape from TopTools);
---Purpose: Extracts closed sub-wires out of <wires> and adds them
-- to <closed>, open wires remained after extraction are put
-- into <open>.
-- If <shared> is True extraction is performed only when
-- edges share the same vertex.
-- If <shared> is False connection is performed only when
-- ends of the edges are at distance less than <toler>.
DispatchWires (myclass; wires : HSequenceOfShape from TopTools;
closed: in out Compound from TopoDS;
open : in out Compound from TopoDS);
---Purpose: Dispatches sequence of <wires> into two compounds
-- <closed> for closed wires and <open> for open wires.
-- If a compound is not empty wires are added into it.
---Level: Internal
SplitWires (me: in out) is private;
fields
myWires: Compound from TopoDS;
myEdges: Compound from TopoDS;
myTolerance : Real;
myShared : Boolean;
mySplitClosed: Boolean;
mySplitOpen : Boolean;
end FreeBounds;
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