org.apache.commons.math3.geometry.spherical.twod

## Class Edge

- java.lang.Object
- - org.apache.commons.math3.geometry.spherical.twod.Edge

-     public class Edge
      extends Object

  Spherical polygons boundary edge.
  Since:
    3.3
  Version:
    $Id: Edge.java 1561506 2014-01-26 15:31:18Z luc $
  See Also:
    `SphericalPolygonsSet.getBoundaryLoops()`, `Vertex`

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Circle` | `getCircle()` Get the circle supporting this edge.
    `Vertex` | `getEnd()` Get end vertex.
    `double` | `getLength()` Get the length of the arc.
    `Vector3D` | `getPointAt(double alpha)` Get an intermediate point.
    `Vertex` | `getStart()` Get start vertex.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Method Detail

    - #### getStart

          public Vertex getStart()

      Get start vertex.
      Returns:
        start vertex

    - #### getEnd

          public Vertex getEnd()

      Get end vertex.
      Returns:
        end vertex

    - #### getLength

          public double getLength()

      Get the length of the arc.
      Returns:
        length of the arc (can be greater than \( \pi \))

    - #### getCircle

          public Circle getCircle()

      Get the circle supporting this edge.
      Returns:
        circle supporting this edge

    - #### getPointAt

          public Vector3D getPointAt(double alpha)

      Get an intermediate point.

      The angle along the edge should normally be between 0 and `getLength()` in order to remain within edge limits. However, there are no checks on the value of the angle, so user can rebuild the full circle on which an edge is defined if they want.

      Parameters:
        `alpha` - angle along the edge, counted from `getStart()`
      Returns:
        an intermediate point

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