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CvInvokeEllipse Method (IInputOutputArray, Point, Size, Double, Double, Double, MCvScalar, Int32, LineType, Int32)
http://www.emgu.com
Draws a simple or thick elliptic arc or fills an ellipse sector. The arc is clipped by ROI rectangle. A piecewise-linear approximation is used for antialiased arcs and thick arcs. All the angles are given in degrees.

Namespace: Emgu.CV
Assembly: Emgu.CV.World (in Emgu.CV.World.dll) Version: 3.1.0.2282 (3.1.0.2282)
Syntax
public static void Ellipse(
	IInputOutputArray img,
	Point center,
	Size axes,
	double angle,
	double startAngle,
	double endAngle,
	MCvScalar color,
	int thickness = 1,
	LineType lineType = LineType.EightConnected,
	int shift = 0
)

Parameters

img
Type: Emgu.CVIInputOutputArray
Image
center
Type: System.DrawingPoint
Center of the ellipse
axes
Type: System.DrawingSize
Length of the ellipse axes
angle
Type: SystemDouble
Rotation angle
startAngle
Type: SystemDouble
Starting angle of the elliptic arc
endAngle
Type: SystemDouble
Ending angle of the elliptic arc
color
Type: Emgu.CV.StructureMCvScalar
Ellipse color
thickness (Optional)
Type: SystemInt32
Thickness of the ellipse arc
lineType (Optional)
Type: Emgu.CV.CvEnumLineType
Type of the ellipse boundary
shift (Optional)
Type: SystemInt32
Number of fractional bits in the center coordinates and axes' values
See Also