Java tutorial
//package com.java2s; /* * This file is part of Skiggle, an online handwriting recognition * Java application. * Copyright (C) 2009-2011 Willie Lim <wlim650@gmail.com> * * Skiggle is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Skiggle 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Skiggle. If not, see <http://www.gnu.org/licenses/>. * */ public class Main { public static double getAbsAngle(double y, double x) { double angle = 0.0F; // atan2 is positive in the lower right quadrant and negative in upper right quadrant and measured // from the horizontal (positive x-axis) angle = Math.IEEEremainder(360 + Math.toDegrees(Math.atan2(y, x)), 360); return angle; } }