BRepOffset_MakeSimpleOffset Class Reference

This class represents simple offset algorithm itself. It builds simple offset without intersection. Solid can be created using SetBuildSolidFlag method (set flag to true). By default shell will be constructed. More...

#include <BRepOffset_MakeSimpleOffset.hxx>

Public Member Functions
	BRepOffset_MakeSimpleOffset ()
	Constructor. Does nothing.
	BRepOffset_MakeSimpleOffset (const TopoDS_Shape &theInputShape, const Standard_Real theOffsetValue)
	Constructor.
void	Initialize (const TopoDS_Shape &theInputShape, const Standard_Real theOffsetValue)
	Initialies shape for modifications.
void	Perform ()
	Computes offset shape.
TCollection_AsciiString	GetErrorMessage () const
	Gets error message.
BRepOffsetSimple_Status	GetError () const
	Gets error code.
Standard_Boolean	GetBuildSolidFlag () const
	Gets solid building flag.
void	SetBuildSolidFlag (const Standard_Boolean theBuildFlag)
	Sets solid building flag.
Standard_Real	GetOffsetValue () const
	Gets offset value.
void	SetOffsetValue (const Standard_Real theOffsetValue)
	Sets offset value.
Standard_Real	GetTolerance () const
	Gets tolerance (used for handling singularities).
void	SetTolerance (const Standard_Real theValue)
	Sets tolerance (used for handling singularities).
Standard_Boolean	IsDone () const
	Gets done state.
const TopoDS_Shape &	GetResultShape () const
	Returns result shape.
Standard_Real	GetSafeOffset (const Standard_Real theExpectedToler)
	Computes max safe offset value for the given tolerance.
const TopoDS_Shape	Generated (const TopoDS_Shape &theShape) const
	Returns result shape for the given one (if exists).
const TopoDS_Shape	Modified (const TopoDS_Shape &theShape) const
	Returns modified shape for the given one (if exists).

Protected Member Functions
void	ComputeMaxAngle ()
	Computes max angle in faces junction.
void	Clear ()
	Clears previous result.

Detailed Description

This class represents simple offset algorithm itself. It builds simple offset without intersection. Solid can be created using SetBuildSolidFlag method (set flag to true). By default shell will be constructed.

Algorithm:

1. Build source-image maps for vertices, edges and faces.BRepTools_Modification class will be used to store this information. An image of a shared edge can be constructed from the corresponding edge of the first iterated face.
2. Run BRepTools_Modifier to obtain offset shape. Limitations: According to the algorithm nature result depends on the smoothness of input data. Smooth (G1-continuity) input shape will lead to the good result.

The possible drawback of the simple algorithm is that it leads, in general case, to tolerance increasing. The tolerances have to grow in order to cover the gaps between the neighbor faces in the output. It should be noted that the actual tolerance growth depends on the offset distance and the quality of joints between the input faces. Anyway the good input shell (smooth connections between adjacent faces) will lead to good result.

Constructor & Destructor Documentation

BRepOffset_MakeSimpleOffset() [1/2]

BRepOffset_MakeSimpleOffset::BRepOffset_MakeSimpleOffset

(

)

Constructor. Does nothing.

BRepOffset_MakeSimpleOffset() [2/2]

BRepOffset_MakeSimpleOffset::BRepOffset_MakeSimpleOffset	(	const TopoDS_Shape &	theInputShape,
		const Standard_Real	theOffsetValue
	)

Constructor.

Member Function Documentation

Clear()

void BRepOffset_MakeSimpleOffset::Clear ( )

protected

Clears previous result.

ComputeMaxAngle()

void BRepOffset_MakeSimpleOffset::ComputeMaxAngle ( )

protected

Computes max angle in faces junction.

Generated()

const TopoDS_Shape BRepOffset_MakeSimpleOffset::Generated

(

const TopoDS_Shape &

theShape

)

const

Returns result shape for the given one (if exists).

GetBuildSolidFlag()

Standard_Boolean BRepOffset_MakeSimpleOffset::GetBuildSolidFlag ( ) const

inline

Gets solid building flag.

GetError()

BRepOffsetSimple_Status BRepOffset_MakeSimpleOffset::GetError ( ) const

inline

Gets error code.

GetErrorMessage()

TCollection_AsciiString BRepOffset_MakeSimpleOffset::GetErrorMessage

(

)

const

Gets error message.

GetOffsetValue()

Standard_Real BRepOffset_MakeSimpleOffset::GetOffsetValue ( ) const

inline

Gets offset value.

GetResultShape()

const TopoDS_Shape & BRepOffset_MakeSimpleOffset::GetResultShape ( ) const

inline

Returns result shape.

GetSafeOffset()

Standard_Real BRepOffset_MakeSimpleOffset::GetSafeOffset

(

const Standard_Real

theExpectedToler

)

Computes max safe offset value for the given tolerance.

GetTolerance()

Standard_Real BRepOffset_MakeSimpleOffset::GetTolerance ( ) const

inline

Gets tolerance (used for handling singularities).

Initialize()

void BRepOffset_MakeSimpleOffset::Initialize	(	const TopoDS_Shape &	theInputShape,
		const Standard_Real	theOffsetValue
	)

Initialies shape for modifications.

IsDone()

Standard_Boolean BRepOffset_MakeSimpleOffset::IsDone ( ) const

inline

Gets done state.

Modified()

const TopoDS_Shape BRepOffset_MakeSimpleOffset::Modified

(

const TopoDS_Shape &

theShape

)

const

Returns modified shape for the given one (if exists).

Perform()

void BRepOffset_MakeSimpleOffset::Perform

(

)

Computes offset shape.

SetBuildSolidFlag()

void BRepOffset_MakeSimpleOffset::SetBuildSolidFlag ( const Standard_Boolean  theBuildFlag )

inline

Sets solid building flag.

SetOffsetValue()

void BRepOffset_MakeSimpleOffset::SetOffsetValue ( const Standard_Real  theOffsetValue )

inline

Sets offset value.

SetTolerance()

void BRepOffset_MakeSimpleOffset::SetTolerance ( const Standard_Real  theValue )

inline

Sets tolerance (used for handling singularities).

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The documentation for this class was generated from the following file:

• BRepOffset_MakeSimpleOffset.hxx