calculate Angle - Java java.lang

Java examples for java.lang:Math Geometry Shape

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Description

calculate Angle

Demo Code

/*/*from   w  ww  . j a v a  2s .c  om*/
 * $Id: PaintUtils.java 4193 2012-06-27 19:42:05Z kschaefe $
 *
 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
//package com.java2s;

import java.awt.geom.Point2D;

public class Main {
    private static double calcAngle(Point2D p1, Point2D p2) {
        double x_off = p2.getX() - p1.getX();
        double y_off = p2.getY() - p1.getY();
        double angle = Math.atan(y_off / x_off);
        if (x_off < 0) {
            angle = angle + Math.PI;
        }

        if (angle < 0) {
            angle += 2 * Math.PI;
        }
        if (angle > 2 * Math.PI) {
            angle -= 2 * Math.PI;
        }
        return angle;
    }
}

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