Distance.java

package com.osroyale.game.world.pathfinding.distance;
 
import com.osroyale.game.world.position.Position;

public interface Distance {

    int calculate(Position from, Position to);

    final class Chebyshev implements Distance {
 
        @Override
        public int calculate(Position to, Position from) {
            int dx = Math.abs(from.getX() - to.getX());
            int dy = Math.abs(from.getX() - to.getY());
            return dx >= dy ? dx : dy;
        }
    }

    class Euclidean implements Distance {
 
        @Override
        public int calculate(Position to, Position from) {
            int deltaX = from.getX() - to.getX();
            int deltaY = from.getY() - to.getY();
            return (int) Math.sqrt(deltaX * deltaX + deltaY * deltaY);
        }
 
    }

    class Manhattan implements Distance {
 
        @Override
        public int calculate(Position to, Position from) {
            int deltaX = Math.abs(from.getX() - to.getX());
            int deltaY = Math.abs(from.getY() - to.getY());
            return deltaX + deltaY;
        }
 
    }
}