Here you can find the source of distance(float aX, float aY, float bX, float bY)
public static float distance(float aX, float aY, float bX, float bY)
//package com.java2s; /*//from ww w. jav a 2 s. c om * Copyright 2012 ZXing authors * * 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. */ public class Main { public static float distance(float aX, float aY, float bX, float bY) { float xDiff = aX - bX; float yDiff = aY - bY; return (float) Math.sqrt(xDiff * xDiff + yDiff * yDiff); } public static float distance(int aX, int aY, int bX, int bY) { int xDiff = aX - bX; int yDiff = aY - bY; return (float) Math.sqrt(xDiff * xDiff + yDiff * yDiff); } }