Class GeoArc

The GeoArc Class: Defines a Geometric Circular Arc.

Inheritance

System.Object

GeoBase

GeoArc

Implements

System.ComponentModel.INotifyPropertyChanged

IGeoLinear

Inherited Members

GeoBase.GeometryEntityType

GeoBase.PropertyChanged

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: Dxflib.Geometry

Assembly: Dxflib.dll

Syntax

public class GeoArc : GeoBase, INotifyPropertyChanged, IGeoLinear

Remarks

Note that an arc can be defined in more than one way. If this GeoArc is a part of an LwPolyLine then is defined using a bulge. If it is alone then it is defined using a radius. Note that there are 3 distinct ways to construct an Arc

1. The First way is the Vertex, Vertex and Bulge (VVB) Method This Method uses two vertices that are at endpoints of the arc and a numerical values called the bulge.
2. The Second Method is the Center Point, Starting Angle, Ending Angle and Radius (CAAR) Method. The CAAR method uses a point that will be the center point of the arc the starting angle of the arc and the ending angle of the arc as well as the radius of the arc. This method is mostly used if a user would like to create an arc. Also, this method is used in the AutoCAD ARC Entity.
3. The Third Method is the Vertex, Vertex, Vertex (V3) Method. The V3 method uses 3 vertices that the arc must pass though. The first and second vertex are the starting and ending vertices. The middle vertex can be any vertex that is on the arc. During the moving of one vertex the center arc length is usually chosen as the middle vertex. All of the set Properties in this class will cause the geometry of other properties to be updated when they are set.

Constructors

GeoArc(Vertex, Vertex, Vertex)

Geo Arc Constructor: Vertex, Vertex, Vertex (V3) The V3 Constructor takes three vertices that the arc must pass through and calculates all of the other properties of the arc

Declaration

public GeoArc(Vertex vertex0, Vertex middleVertex, Vertex vertex1)

Parameters

Type	Name	Description
Vertex	vertex0	The Starting Vertex
Vertex	middleVertex	The Middle Vertex
Vertex	vertex1	The Ending Vertex

GeoArc(Vertex, Vertex, Double)

GeoArc from Starting Vertex (vertex0) ending Vertex (vertex1) and a bulge

Declaration

public GeoArc(Vertex vertex0, Vertex vertex1, double bulge)

Parameters

Type	Name	Description
Vertex	vertex0	First Vertex
Vertex	vertex1	Second Vertex
System.Double	bulge	The Bulge

GeoArc(Vertex, Double, Double, Double)

GeoArc Constructor: Center Vertex, Starting Angle, Ending Angle and Radius (CAAR)

Declaration

public GeoArc(Vertex centerVertex, double startAngle, double endAngle, double radius)

Parameters

Type	Name	Description
Vertex	centerVertex	The Center Vertex of the GeoArc
System.Double	startAngle	The Starting Angle (Radians)
System.Double	endAngle	The Ending Angle (Radians)
System.Double	radius	The Radius of the Arc

Properties

Angle

Total Angle of the Arc (Radians)

Declaration

public double Angle { get; }

Property Value

Type	Description
System.Double

Remarks

Total angle = EndAngle - StartAngle

Area

Area of the GeoArc

Declaration

public double Area { get; }

Property Value

Type	Description
System.Double

Remarks

Area is defined as the geometric area between the arc and the segment that defines its chord. ChordArea(GeoArc) is the function that is used to calculate the area of this class

BulgeValue

The bulge value for this object (Is similar to the curvature of an arc)

Declaration

public double BulgeValue { get; set; }

Property Value

Type	Description
System.Double

CenterVertex

The Circular center point of the arc

Declaration

public Vertex CenterVertex { get; set; }

Property Value

Type	Description
Vertex

EndAngle

The Ending Angle of the arc (Radians)

Declaration

public double EndAngle { get; set; }

Property Value

Type	Description
System.Double

Remarks

Starting Angle is defined as the angle between two vectors:

1. Vector that starts at CenterVertex and ends at Vertex1
2. The XUnitVector. This Angle is measured in radians

Length

Arc Length of the GeoArc

Declaration

public double Length { get; }

Property Value

Type	Description
System.Double

MiddleVertex

The middle point between the Starting Vertex (Vertex0) and the Ending Vertex (Vertex1) that lies on the path of the arc.

Declaration

public Vertex MiddleVertex { get; set; }

Property Value

Type	Description
Vertex

Radius

The Radius of the Arc

Declaration

public double Radius { get; set; }

Property Value

Type	Description
System.Double

StartAngle

The Starting Angle of the arc (Radians)

Declaration

public double StartAngle { get; set; }

Property Value

Type	Description
System.Double

Remarks

Starting Angle is defined as the angle between two vectors:

1. Vector that starts at CenterVertex and ends at Vertex0
2. The XUnitVector. This Angle is measured in radians

Vertex0

The First Vertex

Declaration

public Vertex Vertex0 { get; set; }

Property Value

Type	Description
Vertex

Vertex1

The Second Vertex

Declaration

public Vertex Vertex1 { get; set; }

Property Value

Type	Description
Vertex

Methods

OnPropertyChanged(String)

The property Changed Function

Declaration

protected override void OnPropertyChanged(string propertyName = null)

Parameters

Type	Name	Description
System.String	propertyName

Overrides

GeoBase.OnPropertyChanged(String)

ToVector()

Converts this object to a Vector. Where the HeadVertex and TailVertex correspond with the Vertex0 and Vertex1 of this object respectively.

Declaration

public Vector ToVector()

Returns

Type	Description
Vector	A new Vector Object

UpdateGeometry(String)

Declaration

protected override void UpdateGeometry(string command = "")

Parameters

Type	Name	Description
System.String	command

Overrides

GeoBase.UpdateGeometry(String)

Implements

System.ComponentModel.INotifyPropertyChanged

IGeoLinear