/*
        AUTOMATICALLY GENERATED BY jTemp FROM
        /Users/jsh2/Work/openimaj/target/checkout/content/animation/src/main/jtemp/org/openimaj/content/animation/animator/RandomLinear#TT#ValueAnimator.jtemp
*/
/**
 * Copyright (c) 2011, The University of Southampton and the individual contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   *  Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *
 *   *  Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *
 *   *  Neither the name of the University of Southampton nor the names of its
 *      contributors may be used to endorse or promote products derived from this
 *      software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.openimaj.content.animation.animator;

import cern.jet.random.Uniform;
import cern.jet.random.engine.MersenneTwister;

/**
 * A {@link ValueAnimator} that continuously animates between
 * randomly selected values in a range. Once the stop value 
 * has been reached, the animator chooses a new random target
 * value. 
 * 
 * Each animation between values is linear and has a fixed
 * duration. 
 * 
 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
 *
 */
public class RandomLinearFloatValueAnimator implements ValueAnimator<Float> {
        private int seed;
        
        Uniform rng;
        LinearFloatValueAnimator animator;
        private float min;
        private float max;
        private int duration;
        
        /**
         * Construct a {@link RandomLinearFloatValueAnimator} with the given
         * range and duration for each sub-animation.
         * 
         * @param min minimum allowed value
         * @param max maximum allowed value
         * @param duration duration between values
         */
        public RandomLinearFloatValueAnimator(float min, float max, int duration) {
                seed = (int) System.nanoTime();

                this.min = min;
                this.max = max;
                this.duration = duration;
                
                reset();
        }
        
        /**
         * Construct a {@link RandomLinearFloatValueAnimator} with the given
         * range, duration for each sub-animation and fixed initial value.
         * 
         * @param min minimum allowed value
         * @param max maximum allowed value
         * @param duration duration between values
         * @param initial initial starting value
         */
        public RandomLinearFloatValueAnimator(float min, float max, int duration, float initial) {
                this(min, max, duration);
                setNextAnimator(initial);
        }
        
        /**
         * Construct a {@link RandomLinearFloatValueAnimator} with the given
         * range and duration for each sub-animation.
         * 
         * The sub-animations will start after startWait ticks, and 
         * finish stopWait ticks after startWait+duration.
         * 
         * @param startWait amount of time in ticks to wait before starting animation.
         * @param stopWait amount of time in ticks to wait after finishing animation. 
         * @param min minimum allowed value
         * @param max maximum allowed value
         * @param duration duration between values
         */
        public RandomLinearFloatValueAnimator(int startWait, int stopWait, float min, float max, int duration) {
                seed = (int) System.currentTimeMillis();

                this.min = min;
                this.max = max;
                this.duration = duration;
                
                reset();
        }
        
        /**
         * Construct a {@link RandomLinearFloatValueAnimator} with the given
         * range, duration for each sub-animation and fixed initial value.
         * 
         * The sub-animations will start after startWait ticks, and 
         * finish stopWait ticks after startWait+duration.
         * 
         * @param startWait amount of time in ticks to wait before starting animation.
         * @param stopWait amount of time in ticks to wait after finishing animation. 
         * @param min minimum allowed value
         * @param max maximum allowed value
         * @param duration duration between values
         * @param initial initial starting value
         */
        public RandomLinearFloatValueAnimator(int startWait, int stopWait, float min, float max, int duration, float initial) {
                this(min, max, duration);
                setNextAnimator(initial);
        }
        
        @Override
        public Float nextValue() {
                if (animator.hasFinished()) {
                        setNextAnimator(animator.nextValue());
                }

                return animator.nextValue();
        }

        @Override
        public boolean hasFinished() {
                return false;
        }

        @Override
        public void reset() {
                rng = new Uniform(new MersenneTwister(seed));
                
                float v1 = (float)rng.nextFloatFromTo(min, max);
                setNextAnimator(v1);
        }
        
        protected void setNextAnimator(float v1) {
                float v2 = (float)rng.nextFloatFromTo(min, max);
                
                animator = new LinearFloatValueAnimator(v1, v2, duration);
        }
}