CogEllipticalAnnulusSection.AngleSpan Property

CogEllipticalAnnulusSection AngleSpan Property

Cognex VisionPro

Returns/sets the angular extent (in radians) and direction of the annulus section. For example, a value of Pi specifies a section that is one half of the full annulus. A value of -Pi specifies the other half.

Namespace: Cognex.VisionPro
Assembly: Cognex.VisionPro.Core (in Cognex.VisionPro.Core.dll) Version: 65.1.0.0

Syntax

C++

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public double AngleSpan { get; set; }

public double AngleSpan { get; set; }

Public Property AngleSpan As Double 
	Get 
	Set

Public Property AngleSpan As Double 
	Get 
	Set

public:
property double AngleSpan {
	double get ();
	void set (double value);
}

public:
property double AngleSpan {
	double get ();
	void set (double value);
}

Property Value

Type: Double

Events

Event Type	Reason
CogEllipticalAnnulusSection Changed	Fires when the value of this property changes. The following state flags may be affected:

Event Type

Reason

CogEllipticalAnnulusSection Changed

Fires when the value of this property changes.

The following state flags may be affected:

Exceptions

Exception	Condition
ArgumentException	Value is zero.

Remarks

Sets or gets the angle span of the start arc of this elliptical annulus section in radians. The angle can be any positive or negative value, but not exactly 0; the sign determines the direction of the arc.

If the absolute value of the angle span is greater than 2π, the arc wraps around on itself. It is not normalized to the range −2π to 2π

For example, an AngleSpan of +π is an arc that describes half of a full ellipse, and a span of −π describes the other half in the opposite direction.

To simply reverse the direction of an arc, you can use the following:

AngleStart = AngleStart + AngleSpan AngleSpan = −AngleSpan

Default Value: π/2