CogGeneralContour.ReplaceSegmentWithEllipticalArcSegment Method

CogGeneralContour ReplaceSegmentWithEllipticalArcSegment Method

Cognex VisionPro 9.21 SR1

Replaces ReplaceSegment with a new elliptical arc segment. If StartFlags has the 'connected' bit set, then StartX and StartY are ignored. This also applies to EndFlags.

Namespace: Cognex.VisionPro
Assembly: Cognex.VisionPro.Core (in Cognex.VisionPro.Core.dll) Version: 85.1.0.0

Syntax

C++

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public CogGeneralContourSegmentIterator ReplaceSegmentWithEllipticalArcSegment(
	CogGeneralContourSegmentIterator replaceSegment,
	CogGeneralContourVertexConstants startFlags,
	double startX,
	double startY,
	double midpointX,
	double midpointY,
	CogGeneralContourVertexConstants endFlags,
	double endX,
	double endY,
	double ellipseFraction
)

public CogGeneralContourSegmentIterator ReplaceSegmentWithEllipticalArcSegment(
	CogGeneralContourSegmentIterator replaceSegment,
	CogGeneralContourVertexConstants startFlags,
	double startX,
	double startY,
	double midpointX,
	double midpointY,
	CogGeneralContourVertexConstants endFlags,
	double endX,
	double endY,
	double ellipseFraction
)

Public Function ReplaceSegmentWithEllipticalArcSegment ( 
	replaceSegment As CogGeneralContourSegmentIterator,
	startFlags As CogGeneralContourVertexConstants,
	startX As Double,
	startY As Double,
	midpointX As Double,
	midpointY As Double,
	endFlags As CogGeneralContourVertexConstants,
	endX As Double,
	endY As Double,
	ellipseFraction As Double
) As CogGeneralContourSegmentIterator

Public Function ReplaceSegmentWithEllipticalArcSegment ( 
	replaceSegment As CogGeneralContourSegmentIterator,
	startFlags As CogGeneralContourVertexConstants,
	startX As Double,
	startY As Double,
	midpointX As Double,
	midpointY As Double,
	endFlags As CogGeneralContourVertexConstants,
	endX As Double,
	endY As Double,
	ellipseFraction As Double
) As CogGeneralContourSegmentIterator

public:
CogGeneralContourSegmentIterator^ ReplaceSegmentWithEllipticalArcSegment(
	CogGeneralContourSegmentIterator^ replaceSegment, 
	CogGeneralContourVertexConstants startFlags, 
	double startX, 
	double startY, 
	double midpointX, 
	double midpointY, 
	CogGeneralContourVertexConstants endFlags, 
	double endX, 
	double endY, 
	double ellipseFraction
)

public:
CogGeneralContourSegmentIterator^ ReplaceSegmentWithEllipticalArcSegment(
	CogGeneralContourSegmentIterator^ replaceSegment, 
	CogGeneralContourVertexConstants startFlags, 
	double startX, 
	double startY, 
	double midpointX, 
	double midpointY, 
	CogGeneralContourVertexConstants endFlags, 
	double endX, 
	double endY, 
	double ellipseFraction
)

Parameters

replaceSegment: Type: Cognex.VisionPro CogGeneralContourSegmentIterator
The segment to be replaced.

startFlags: Type: Cognex.VisionPro CogGeneralContourVertexConstants
Flags that specify how the start point is treated with respect to the other segments in the contour shape.

startX: Type: System Double
X-coordinate of the start point of the segment. Ignored if startFlags includes Connected.

startY: Type: System Double
Y-coordinate of the start point of the segment. Ignored if startFlags includes Connected.

midpointX: Type: System Double
X-coordinate of the midpoint of the elliptical arc segment.

midpointY: Type: System Double
Y-coordinate of the midpoint of the elliptical arc segment.

endFlags: Type: Cognex.VisionPro CogGeneralContourVertexConstants
Flags that specify how the end point is treated with respect to the other segments in the contour shape.

endX: Type: System Double
X-coordinate of the end point of the segment. Ignored if endFlags includes Connected.

endY: Type: System Double
Y-coordinate of the end point of the segment. Ignored if endFlags includes Connected.

ellipseFraction: Type: System Double
The fraction of the ellipse that passes through the start, mid-, and end points. For slight arcs, using roughly a quarter of the ellipse usually provides good results. This value must be greater than 0 and less than 1

Return Value

Type: CogGeneralContourSegmentIterator

A new iterator positioned at the new segment.

Events

Event Type	Reason
CogGeneralContour Changed	Fires when the segment is replaced. The following state flags may be affected:

Event Type

Reason

CogGeneralContour Changed

Fires when the segment is replaced.

The following state flags may be affected:

Exceptions

Exception	Condition
CogShapeBadContourSegConnException	replaceSegment is the first segment and startFlags includes Connected or replaceSegment is the end segment and endFlags includes Connected.
ArgumentException	startFlags or endFlags include bits that are not defined in CogGeneralContourVertexConstants.
ArgumentException	EllipseFraction is < 0 or > 1.
CogShapeCoordinatesMustDifferException	Points in the new segment are coincident.
CogIteratorInvalidIteratorException	replaceSegment is invalid and not the end iterator.
CogShapeBadContourChainClosureException	endFlags include Closed but startFlags do not include Connected ; or startFlags include Closed but endFlags do not include Connected. This error may also occur if the startFlags and endFlags are set properly but closing the chain would create a contour with only two segments.
CogShapeDegenerateEllipticalArcSegException	Points on the elliptical arc segment are colinear.

Remarks

Replaces replaceSegment with a new elliptical arc segment and returns a new iterator positioned at the new segment.

If replaceSegment is Nothing or if replaceSegment.IsEnd is True, ReplaceSegmentWithEllipticalArcSegment(CogGeneralContourSegmentIterator, CogGeneralContourVertexConstants, Double, Double, Double, Double, CogGeneralContourVertexConstants, Double, Double, Double) behaves exactly as if AddEllipticalArcSegment(CogGeneralContourSegmentIterator, CogGeneralContourVertexConstants, Double, Double, Double, Double, CogGeneralContourVertexConstants, Double, Double, Double) were called with NextSegment set to Nothing.

If startFlags includes Connected, then startX and startY are ignored. Similarly, if endFlags includes Connected, then endX and endY are ignored.

Note: ReplaceSegmentWithEllipticalArcSegment(CogGeneralContourSegmentIterator, CogGeneralContourVertexConstants, Double, Double, Double, Double, CogGeneralContourVertexConstants, Double, Double, Double) can break connections and undo closed contour chains. Any CogGeneralContourSegmentIterator positioned at the replaced segment (including replaceSegment) become invalid. Other iterators are unchanged.