Here you can find the source of dist(float x1, float y1, float z1, float x2, float y2, float z2)
static public final float dist(float x1, float y1, float z1, float x2, float y2, float z2)
//package com.java2s; /**/* w w w . j a v a 2 s . co m*/ * Copyright 2008 - 2011 * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. * * @project loonframework * @author chenpeng * @email?ceponline@yahoo.com.cn * @version 0.1 */ public class Main { static public final float dist(float x1, float y1, float x2, float y2) { return sqrt(sq(x2 - x1) + sq(y2 - y1)); } static public final float dist(float x1, float y1, float z1, float x2, float y2, float z2) { return sqrt(sq(x2 - x1) + sq(y2 - y1) + sq(z2 - z1)); } public static int sqrt(int n) { int s = (n + 65536) >> 1; for (int i = 0; i < 8; i++) { s = (s + div(n, s)) >> 1; } return s; } static public final float sqrt(float a) { return (float) Math.sqrt(a); } static public final float sq(float a) { return a * a; } public static int div(int x, int y) { long z = (((long) x) << 32); return (int) ((z / y) >> 16); } }