/*
 * Copyright 2012-2017 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat 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, or (at your
 * option) any later version.
 *
 * Thermostat 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 Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.experimental.utils;

/**
 * Simple utility class that implement various interpolation methods.
 */
public class Interpolator {

    /**
     * Linearly interpolate between two floating point numbers.
     *
     * @param a the first point in the range where interpolation occurs.
     * @param b the end point in the range where interpolation occurs.
     * @param t the value for the interpolation, it is intended to be in the
     *          closed unit interval [0,1].
     */
    public static float lerp(float a, float b, float t)  {
        return (a * (1.0f - t)) + (b * t);
    }

    /**
     * Linearly interpolate between two integers.
     *
     * @param a the first point in the range where interpolation occurs.
     * @param b the end point in the range where interpolation occurs.
     * @param t the value for the interpolation, it is intended to be in the
     *          closed unit interval [0,1].
     */
    public static int lerp(int a, int b, float t)  {
        return (int) ((a * (1 - t)) + (b * t));
    }
}