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-- File: STEPConstruct_UnitContext.cdl
-- Created: Thu Jan 18 15:16:52 1996
-- Author: Frederic MAUPAS
-- <fma@pronox>
---Copyright: Matra Datavision 1996
class UnitContext from STEPConstruct
---Purpose: Tool for creation (encoding) and decoding (for writing and reading
-- accordingly) context defining units and tolerances (uncerntanties)
uses
SiUnit from StepBasic,
SiPrefix from StepBasic,
NamedUnit from StepBasic,
GlobalUnitAssignedContext from StepRepr,
GlobalUncertaintyAssignedContext from StepRepr,
GeomRepContextAndGlobUnitAssCtxAndGlobUncertaintyAssCtx from StepGeom
is
Create returns UnitContext;
---Purpose: Creates empty tool
Init (me: in out; Tol3d: Real);
---Purpose: Creates new context (units are MM and radians,
-- uncertainty equal to Tol3d)
IsDone (me) returns Boolean;
---Purpose: Returns True if Init was called successfully
Value (me) returns GeomRepContextAndGlobUnitAssCtxAndGlobUncertaintyAssCtx from StepGeom;
---Purpose: Returns context (or Null if not done)
ComputeFactors(me: in out; aContext: GlobalUnitAssignedContext from StepRepr)
returns Integer;
---Purpose: Computes the length, plane angle and solid angle conversion
-- factor . Returns a status, 0 if OK
ComputeFactors(me: in out; aUnit: NamedUnit from StepBasic)
returns Integer;
ComputeTolerance(me: in out; aContext: GlobalUncertaintyAssignedContext from StepRepr)
returns Integer;
---Purpose : Computes the uncertainty value (for length)
LengthFactor(me) returns Real;
---Purpose: Returns the lengthFactor
PlaneAngleFactor(me) returns Real;
---Purpose: Returns the planeAngleFactor
SolidAngleFactor(me) returns Real;
---Purpose: Returns the solidAngleFactor
Uncertainty(me) returns Real;
---Purpose: Returns the Uncertainty value (for length)
-- It has been converted with LengthFactor
AreaFactor(me) returns Real;
---Purpose: Returns the areaFactor
VolumeFactor(me) returns Real;
---Purpose: Returns the volumeFactor
HasUncertainty(me) returns Boolean;
---Purpose: Tells if a Uncertainty (for length) is recorded
LengthDone(me) returns Boolean;
---Purpose: Returns true if ComputeFactors has calculated
-- a LengthFactor
PlaneAngleDone(me) returns Boolean;
---Purpose: Returns true if ComputeFactors has calculated
-- a PlaneAngleFactor
SolidAngleDone(me) returns Boolean;
---Purpose: Returns true if ComputeFactors has calculated
-- a SolidAngleFactor
AreaDone(me) returns Boolean;
---Purpose: Returns true if areaFactor is computed
VolumeDone(me) returns Boolean;
---Purpose: Returns true if volumeFactor is computed
SiUnitNameFactor(me; aSiUnit : SiUnit from StepBasic; val : out Real)
returns Boolean is private;
---Purpose: Fills numerical equivalent of SiUnitName (in SI value)
-- Returns False if name SiUnit Name not recognized
StatusMessage (me; status :Integer) returns CString;
---Purpose: Returns a message for a given status (0 - empty)
-- This message can then be added as warning for transfer
ConvertSiPrefix (myclass; aPrefix: SiPrefix from StepBasic) returns Real;
---Purpose: Convert SI prefix defined by enumertaion to corresponding
-- real factor (e.g. 1e6 for mega)
fields
-- writing (encoding)
done: Boolean;
GRC : GeomRepContextAndGlobUnitAssCtxAndGlobUncertaintyAssCtx from StepGeom;
-- reading (decoding)
lengthFactor : Real;
planeAngleFactor : Real;
solidAngleFactor : Real;
theUncertainty : Real;
areaFactor : Real;
volumeFactor : Real;
areaDone : Boolean;
volumeDone : Boolean;
lengthDone : Boolean;
planeAngleDone : Boolean;
solidAngleDone : Boolean;
hasUncertainty : Boolean;
end UnitContext;
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