Java interpolate interpolateAngle(double oldAngle, double newAngle, double scale)

Description

Interpolate between two angles.

License

Open Source License

Parameter

Parameter	Description
oldAngle	the previous angle.
newAngle	the new angle.
scale	the relative angle between oldAngle (0%) and newAngle (100%).

Return

the interpolated angle.

Declaration

public static double interpolateAngle(double oldAngle, double newAngle, double scale) 

Method Source Code

//package com.java2s;
/*//w  w w  . j  a  v  a2  s .  c o  m
 * @(#) CourseUtils.java
 *
 * This code is part of the JAviator project: javiator.cs.uni-salzburg.at
 * Copyright (c) 2009  Clemens Krainer
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

public class Main {
    /**
     * Interpolate between two angles. This method is only visible within this
     * package.
     * 
     * @param oldAngle the previous angle.
     * @param newAngle the new angle.
     * @param scale the relative angle between oldAngle (0%) and newAngle (100%).
     * @return the interpolated angle.
     */
    public static double interpolateAngle(double oldAngle, double newAngle, double scale) {
        while (newAngle - oldAngle > 360)
            newAngle -= 360;

        while (newAngle - oldAngle < -360)
            newAngle += 360;

        double result = oldAngle + (newAngle - oldAngle) * scale;

        while (result < 0)
            result += 360;

        while (result >= 360)
            result -= 360;

        return result;
    }
}

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