Package org.tinfour.utils.alphashape

Class AlphaPart

  • public class AlphaPart
extends Object
    Provides a set of edges that define the path of an alpha shape. The path may represent either the outer bounds of a region or an enclosed region.

    • Method Detail

      • getPartType

        public AlphaPartType getPartType()
        Gets the type of part (polygon, unconnected lines, or unassociated vertices) for this alpha part.
        Returns:
        a valid enumeration instance.

      • getChildren

        public List<AlphaPart> getChildren()
        Gets a list of any child (embedded) alpha part components.
        Returns:
        a valid, potentially empty list.

      • getEdges

        public List<IQuadEdge> getEdges()
        Gets a list of the edges that define the alpha part. Because this call exposes the internal list element of the part, applications should not modify the List instance that is returned from this call.
        Returns:
        a valid, potentially empty list

      • getVertices

        public List<Vertex> getVertices()
        Gets a list of the Vertices that define the alpha part. Because this call exposes the internal list element of the part, applications should not modify the List instance that is returned from this call.
        Returns:
        a valid, potentially empty list

      • getParent

        public AlphaPart getParent()
        Gets the alpha part that contains this instance (if any).
        Returns:
        if a parent exists, a valid reference; otherwise, a null.

      • isAnEnclosure

        public boolean isAnEnclosure()
        Indicates that the path encloses a region.
        Returns:
        true if the region indicated by the path encloses a set of points definition an alpha shape.

      • isEnclosed

        public boolean isEnclosed()
        Indicates that the path represents a region that is in the interior of an alpha shape..
        Returns:
        true if the region indicated by the path is enclosed by a set of points defining an alpha shape.

      • isPolygon

        public boolean isPolygon()
        Indicates whether the part is a polygon feature.
        Returns:
        true if the part is a polygon feature; false if it is a an open-line.

      • getArea

        public double getArea()
        Gets the computed area of a polygon feature.
        Returns:
        a signed real value (positive for polygons with a counterclockwise orientation, negative for clockwise).

      • getPath2D

        public Path2D getPath2D()
        Get an instance of Path2D populated with coordinates taken from the edges that define this alpha part. For a polygon part, the defining points will be linked together as a series of connected line segments. For a non-polygon part, the Path2D will consist of a series of separate line segments. Non-polygon parts are no suitable for rendering using Java's area-fill routines.
        Returns:
        a valid instance