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--
-- File : OffsetCurve.cdl
-- Created : Sat 9 Jan 1993
-- Author : CKY / Contract Toubro-Larsen ( TCD )
--
---Copyright : MATRA-DATAVISION 1993
--
class OffsetCurve from IGESGeom inherits IGESEntity
---Purpose: defines IGESOffsetCurve, Type <130> Form <0>
-- in package IGESGeom
-- An OffsetCurve entity contains the data necessary to
-- determine the offset of a given curve C. This entity
-- points to the base curve to be offset and contains
-- offset distance and other pertinent information.
uses
Vec from gp,
XYZ from gp
is
Create returns mutable OffsetCurve;
-- Specific Methods pertaining to the class
Init (me : mutable;
aBaseCurve : IGESEntity;
anOffsetType : Integer;
aFunction : IGESEntity;
aFunctionCoord : Integer;
aTaperedOffsetType : Integer;
offDistance1 : Real;
arcLength1 : Real;
offDistance2 : Real;
arcLength2 : Real;
aNormalVec : XYZ;
anOffsetParam : Real;
anotherOffsetParam : Real);
---Purpose : This method is used to set the fields of the class
-- OffsetCurve
-- - aBaseCurve : The curve entity to be offset
-- - anOffsetType : Offset distance flag
-- 1 = Single value, uniform distance
-- 2 = Varying linearly
-- 3 = As a specified function
-- - aFunction : Curve entity, one coordinate of which
-- describes offset as a function of its
-- parameter (0 unless OffsetType = 3)
-- - aFunctionCoord : Particular coordinate of curve
-- describing offset as function of its
-- parameters. (used if OffsetType = 3)
-- - aTaperedOffsetType : Tapered offset type flag
-- 1 = Function of arc length
-- 2 = Function of parameter
-- (Only used if OffsetType = 2 or 3)
-- - offDistance1 : First offset distance
-- (Only used if OffsetType = 1 or 2)
-- - arcLength1 : Arc length or parameter value of
-- first offset distance
-- (Only used if OffsetType = 2)
-- - offDistance2 : Second offset distance
-- - arcLength2 : Arc length or parameter value of
-- second offset distance
-- (Only used if OffsetType = 2)
-- - aNormalVec : Unit vector normal to plane containing
-- curve to be offset
-- - anOffsetParam : Start parameter value of offset curve
-- - anotherOffsetParam : End parameter value of offset curve
BaseCurve (me) returns IGESEntity;
---Purpose : returns the curve to be offset
OffsetType (me) returns Integer;
---Purpose : returns the offset distance flag
-- 1 = Single value offset (uniform distance)
-- 2 = Offset distance varying linearly
-- 3 = Offset distance specified as a function
Function (me) returns IGESEntity;
---Purpose : returns the function defining the offset if at all the offset
-- is described as a function or Null Handle.
HasFunction (me) returns Boolean;
---Purpose : returns True if function defining the offset is present.
FunctionParameter (me) returns Integer;
---Purpose : returns particular coordinate of the curve which describes offset
-- as a function of its parameters. (only used if OffsetType() = 3)
TaperedOffsetType (me) returns Integer;
---Purpose : returns tapered offset type flag (only used if OffsetType() = 2 or 3)
-- 1 = Function of arc length
-- 2 = Function of parameter
FirstOffsetDistance (me) returns Real;
---Purpose : returns first offset distance (only used if OffsetType() = 1 or 2)
ArcLength1 (me) returns Real;
---Purpose : returns arc length or parameter value (depending on value of
-- offset distance flag) of first offset distance
-- (only used if OffsetType() = 2)
SecondOffsetDistance (me) returns Real;
---Purpose : returns the second offset distance
ArcLength2 (me) returns Real;
---Purpose : returns arc length or parameter value (depending on value of
-- offset distance flag) of second offset distance
-- (only used if OffsetType() = 2)
NormalVector (me) returns Vec;
---Purpose : returns unit vector normal to plane containing curve to be offset
TransformedNormalVector (me) returns Vec;
---Purpose : returns unit vector normal to plane containing curve to be offset
-- after applying Transf. Matrix
Parameters (me; StartParam, EndParam : out Real);
-- returns start and end parameter values of the offset curve
StartParameter (me) returns Real;
---Purpose : returns Start Parameter value of the offset curve
EndParameter (me) returns Real;
---Purpose : returns End Parameter value of the offset curve
fields
--
-- Class : IGESGeom_OffsetCurve
--
-- Purpose : Declaration of variables specific to the definition
-- of the Class OffsetCurve.
--
-- Reminder : A OffsetCurve instance is defined by :
-- The curve to be offset, the offset type (indicating
-- whether the offset is single valued, or varies linearly
-- or is a function), the curve representing the function
-- in case offset is specified as a function, the offset
-- distances, unit vector normal to the plane containing
-- offset curve, the starting and ending parameters of offset
-- curve
theBaseCurve : IGESEntity;
theOffsetType : Integer;
theFunction : IGESEntity;
theFunctionCoord : Integer;
theTaperedOffsetType : Integer;
theOffsetDistance1 : Real;
theArcLength1 : Real;
theOffsetDistance2 : Real;
theArcLength2 : Real;
theNormalVector : XYZ;
theOffsetParam1 : Real;
theOffsetParam2 : Real;
end OffsetCurve;
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