Package org.djutils.draw.line

Interface Ray<R extends Ray<R,D,P>,D extends Directed<D>,P extends Point<P>>

Type Parameters:
R - The Ray type (2d or 3d)
D - The Directed type (2d or 3d)
P - The Point type (2d or 3d)
All Superinterfaces:
Project<P>
All Known Implementing Classes:
Ray2d, Ray3d
public interface Ray<R extends Ray<R,D,P>,D extends Directed<D>,P extends Point<P>> extends Project<P>
A Ray is a half-line; it has one end point with non-infinite coordinates; the other end point is infinitely far away.

Copyright (c) 2020-2025 Delft University of Technology, PO Box 5, 2600 AA, Delft, the Netherlands. All rights reserved.
BSD-style license. See DJUTILS License.

Author:
Alexander Verbraeck, Peter Knoppers, Wouter Schakel

  • Method Details

    • getEndPoint

      D getEndPoint()
      Get the finite end point of this Ray.
      Returns:
      the finite end point of this Ray

    • getDirZ

      double getDirZ()
      Retrieve the angle from the positive X axis direction in radians.
      Returns:
      the angle from the positive X axis direction in radians

    • flip

      R flip()
      Flip the direction of the Ray (creates and returns a new Ray instance).
      Returns:
      Ray at the same location, but with dirZ (in case of a Ray3d) incremented by π and dirY subtracted from π

    • getLocation

      default R getLocation(double position)
      Get the location at a position on the line, with its direction. Position must be a positive, finite value
      Parameters:
      position - the position on the line for which to calculate the point on the line
      Returns:
      a ray with the same direction as this ray (even if the direction of this ray is not normalized)
      Throws:
      ArithmeticException - when position is NaN
      IllegalArgumentException - when position < 0.0, or infinite

    • getLocationExtended

      R getLocationExtended(double position)
      Get the location at a position on the line, with its direction. Position must be a finite value
      Parameters:
      position - the position on the line for which to calculate the point on the line
      Returns:
      a ray with the same direction as this ray
      Throws:
      ArithmeticException - when position is NaN
      IllegalArgumentException - when position infinite

    • closestPointOnRay

      P closestPointOnRay(P point)
      Project a Point on a Ray. If the the projected points lies outside the ray, the start point of the ray is returned. Otherwise the closest point on the ray is returned.
      Adapted from example code published by Paul Bourke.
      Parameters:
      point - the point to project onto the segment
      Returns:
      either the start point, or DirectedPoint that lies somewhere on this Ray
      Throws:
      NullPointerException - when point is null