com.vividsolutions.jts.algorithm

Class CGAlgorithmsDD


  • public class CGAlgorithmsDD
extends Object
    Implements basic computational geometry algorithms using DD arithmetic.

    • Constructor Detail

      • CGAlgorithmsDD

        public CGAlgorithmsDD()

    • Method Detail

      • orientationIndex

        public static int orientationIndex(Coordinate p1,
                                   Coordinate p2,
                                   Coordinate q)
        Returns the index of the direction of the point q relative to a vector specified by p1-p2.
        Parameters:
        p1 - the origin point of the vector
        p2 - the final point of the vector
        q - the point to compute the direction to
        Returns:
        1 if q is counter-clockwise (left) from p1-p2

      • signOfDet2x2

        public static int signOfDet2x2(DD x1,
                               DD y1,
                               DD x2,
                               DD y2)
        Computes the sign of the determinant of the 2x2 matrix with the given entries.
        Returns:
        -1 if the determinant is negative,

      • intersection

        public static Coordinate intersection(Coordinate p1,
                                      Coordinate p2,
                                      Coordinate q1,
                                      Coordinate q2)
        Computes an intersection point between two lines using DD arithmetic. Currently does not handle case of parallel lines.
        Parameters:
        p1 -
        p2 -
        q1 -
        q2 -
        Returns: