Point.java

/*
 * Copyright 2013 Hannes Janetzek
 *
 * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
 *
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.oscim.core;

public class Point {
	public double x;
	public double y;

	public Point() {
	}

	public Point(double x, double y) {
		this.x = x;
		this.y = y;
	}

	public double getX() {
		return x;
	}

	public double getY() {
		return y;
	}

	public double distance(Point other) {
		return Math.sqrt((x - other.x) * (x - other.x) + (y - other.y) + (y - other.y));
	}

	public double distanceSq(Point other) {
		return (x - other.x) * (x - other.x) + (y - other.y) + (y - other.y);
	}

	@Override
	public String toString() {
		return x + " " + y;
	}

	public void setPerpendicular(Point other) {
		x = -other.y;
		y = other.x;
	}

	public void setPerpendicular(Point p1, Point p2) {
		x = p1.x + p2.x;
		y = p1.y + p2.y;

		double a = p2.x * y - p2.y * x;

		if (a < 0.01 && a > -0.01) {
			/* Almost straight */
			x = -p2.y;
			y = p2.x;
		} else {
			x /= a;
			y /= a;
		}
	}
}