CogMath.DistanceCircleCircle Method

CogMath DistanceCircleCircle Method

Cognex VisionPro 9.10

Returns the shortest distance between the given circles. Also provides the points on each shape that correspond to this shortest distance.

Namespace: Cognex.VisionPro
Assembly: Cognex.VisionPro.Core (in Cognex.VisionPro.Core.dll) Version: 79.0.0.0

Syntax

C++

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public static double DistanceCircleCircle(
	CogCircle circleA,
	CogCircle circleB,
	ICogImage image,
	out double circleAX,
	out double circleAY,
	out double circleBX,
	out double circleBY
)

public static double DistanceCircleCircle(
	CogCircle circleA,
	CogCircle circleB,
	ICogImage image,
	out double circleAX,
	out double circleAY,
	out double circleBX,
	out double circleBY
)

Public Shared Function DistanceCircleCircle ( 
	circleA As CogCircle,
	circleB As CogCircle,
	image As ICogImage,
	<OutAttribute> ByRef circleAX As Double,
	<OutAttribute> ByRef circleAY As Double,
	<OutAttribute> ByRef circleBX As Double,
	<OutAttribute> ByRef circleBY As Double
) As Double

Public Shared Function DistanceCircleCircle ( 
	circleA As CogCircle,
	circleB As CogCircle,
	image As ICogImage,
	<OutAttribute> ByRef circleAX As Double,
	<OutAttribute> ByRef circleAY As Double,
	<OutAttribute> ByRef circleBX As Double,
	<OutAttribute> ByRef circleBY As Double
) As Double

public:
static double DistanceCircleCircle(
	CogCircle^ circleA, 
	CogCircle^ circleB, 
	ICogImage^ image, 
	[OutAttribute] double% circleAX, 
	[OutAttribute] double% circleAY, 
	[OutAttribute] double% circleBX, 
	[OutAttribute] double% circleBY
)

public:
static double DistanceCircleCircle(
	CogCircle^ circleA, 
	CogCircle^ circleB, 
	ICogImage^ image, 
	[OutAttribute] double% circleAX, 
	[OutAttribute] double% circleAY, 
	[OutAttribute] double% circleBX, 
	[OutAttribute] double% circleBY
)

Parameters

circleA: Type: Cognex.VisionPro CogCircle
The first circle.

circleB: Type: Cognex.VisionPro CogCircle
The second circle.

image: Type: Cognex.VisionPro ICogImage
An image that specifies the coordinate space to use.

circleAX: Type: System Double
The x-coordinate of the nearest point in circleA.

circleAY: Type: System Double
The y-coordinate of the nearest point in circleA.

circleBX: Type: System Double
The x-coordinate of the nearest point in circleB.

circleBY: Type: System Double
The y-coordinate of the nearest point in circleB.

Return Value

Type: Double

The shortest distance between the two circles. The distance in negative if one circle is wholly within the other; zero if the circles are coincident, tangent, or intersecting.

Exceptions

Exception	Condition
ArgumentException	circleA or circleB is NULL.
CogMathUnsupportedGeometryException	It is impossible to map both circleA and circleB to the same coordinate space without converting one or both circles into ellipses.
CogSpaceTreeInvalidNameSyntaxException	At least one shape's selected space names is not a legal space name.
CogSpaceTreeNotUniqueException	At least one shape's selected space names is a nonqualified space name and more than one instance of it exists in image's coordinate space tree.
CogSpaceTreeNotInTreeException	At least one shape does not exist in image's coordinate space tree.
CogImageNoTreeException	The coordinate space tree is missing from image.

Remarks

Returns the shortest distance between the given circles and optionally the points on each shape that correspond to this shortest distance.

The following table describes how the relationship between circleA and circleB affects the out parameters.

Note: In this release of VisionPro, if it is not possible to map both circleA and circleB into a single space where neither circle is converted into an ellipse, this function will throw E_CogMath_Unsupported_Geometry.

ConditionDistance(circleAX,circleAY)(circleBX,circleBY)

Concentric

The negative of the distance from circleA to circleB.

An arbitrary point on circleA

An arbitrary point on circleB

Non-intersecting

The negative of the shortest distance from circleA to circleB.

The nearest point on circleA

The nearest point on circleB

Non-intersecting

The shortest distance from circleA to circleB.

The nearest point on circleA

The nearest point on circleB

Coincident

(0,0)

Tangent

(0,0)

Intersecting

(0,0)

If you supply a value for the image parameter, then circleA and circleB are mapped to the selected space of image before the measurement is computed and the result is expressed in that space.

If you do not supply a value for image, then circleA and circleB are presumed to be in the same coordinate space.