2 * Copyright 2006 the original author or authors.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package org.wamblee.gps.geometry;
20 * Coordinates in some 3-dimensional coordinate system.
22 public class Coordinates {
29 * Constructs the coordinates.
30 * @param aX1 First coordinate.
31 * @param aX2 Second coordinate.
32 * @param aX3 Third coordinate.
34 public Coordinates(double aX1, double aX2, double aX3) {
40 public double getX1() {
44 public double getX2() {
48 public double getX3() {
53 * @see java.lang.Object#toString()
56 public String toString() {
57 return "(" + getX1() + ", " + getX2() + ", " + getX3() + ")";
60 public Coordinates add(Coordinates aC) {
61 return new Coordinates(_x1 + aC._x1, _x2 + aC._x2, _x3 + aC._x3);
64 public Coordinates subtract(Coordinates aC) {
65 return new Coordinates(_x1 - aC._x1, _x2 - aC._x2, _x3 - aC._x3);
68 public double innerProduct(Coordinates aC) {
69 return _x1 * aC._x1 + _x2 * aC._x2 + _x3 * aC._x3;
72 public Coordinates outerProduct(Coordinates aC) {
73 return new Coordinates(
74 _x2*aC._x3 - _x3*aC._x2,
75 -_x1*aC._x3 + _x3*aC._x1,
76 _x1*aC._x2 - _x2*aC._x1
80 public double norm() {
81 return Math.sqrt(innerProduct(this));
84 public Coordinates scale(double aMultiplier) {
85 return new Coordinates(_x1*aMultiplier, _x2*aMultiplier, _x3*aMultiplier);
88 public Coordinates normalize() {
89 return scale(1.0/norm());