Package eu.svjatoslav.sixth.e3d.renderer.raster.slicer

Class BorderLine

java.lang.Object
eu.svjatoslav.sixth.e3d.renderer.raster.slicer.BorderLine
public class BorderLine extends Object
Represents an edge (border line) of a triangle in the polygon slicing pipeline.

A BorderLine connects two Vertex endpoints and carries an identification count used by the Slicer to determine which edge of the original triangle this line corresponds to (1, 2, or 3). This identification is essential for correct recursive subdivision -- when the longest edge is split, the slicer uses the count to decide how to partition the triangle into two smaller triangles.

See Also:

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    int
    count
    The edge identifier (1, 2, or 3) indicating which edge of the original triangle this border line represents.

  • Constructor Summary

    Constructors
    Constructor
    Description
    BorderLine()
    Creates an uninitialized border line for reuse.

  • Method Summary

    Modifier and Type
    Method
    Description
    double
    getLength()
    Computes the 3D Euclidean distance between the two endpoint vertices.
    Vertex
    getMiddlePoint()
    Computes the midpoint vertex of this edge by averaging both the 3D coordinates and the 2D texture coordinates of the two endpoints.
    void
    set(Vertex c1, Vertex c2, int count)
    Sets the endpoints and edge identifier for this border line.

    Methods inherited from class java.lang.Object

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

  • Field Details

    • count

      public int count
      The edge identifier (1, 2, or 3) indicating which edge of the original triangle this border line represents. Used by Slicer during recursive subdivision.

  • Constructor Details

    • BorderLine

      public BorderLine()
      Creates an uninitialized border line for reuse.

  • Method Details

    • set

      public void set(Vertex c1, Vertex c2, int count)
      Sets the endpoints and edge identifier for this border line.
      Parameters:
      c1 - the first vertex endpoint
      c2 - the second vertex endpoint
      count - the edge identifier (1, 2, or 3)

    • getLength

      public double getLength()
      Computes the 3D Euclidean distance between the two endpoint vertices.
      Returns:
      the length of this edge in world-space units

    • getMiddlePoint

      public Vertex getMiddlePoint()
      Computes the midpoint vertex of this edge by averaging both the 3D coordinates and the 2D texture coordinates of the two endpoints.
      Returns:
      a new Vertex at the midpoint, with interpolated texture coordinates