Interpolators, pulse and repeat

PulseInterpolator.java

package com.example.animation;

import android.view.animation.Interpolator;

public final class PulseInterpolator implements Interpolator {

    private final int duration;
    private final int offFor;

    /**
     * Creates a single pulse signal that has a linear climb from 0..1 over 1 unit of time.
     * Then it stays at 1 for {@param onFor} units of time.
     * Then it has a linear drop from 1..0 over 1 unit of time.
     * Then it stays at 0 for {@param offFor} units of time.
     * <p>
     * Total duration of animation {@param onFor} + {@param offFor} + 2 units.
     *
     * @param onFor  Units of time to stay on for, relative to the duration of the climb/drop.
     * @param offFor Units of time to stay off for, relative to the duration of the climb/drop.
     */
    public PulseInterpolator(int onFor, int offFor) {
        this.duration = onFor + offFor + 2;
        this.offFor   = offFor;
    }

    @Override
    public float getInterpolation(float v) {
        v *= duration;
        if (v > 1) {
            v = duration - v - offFor;
        }
        return Math.max(0, Math.min(1, v));
    }
}

RepeatInterpolator.java

package com.example.animation;

import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;

public final class RepeatInterpolator implements Interpolator {

    private final double repeats;
    private final Interpolator interpolator;

    public RepeatInterpolator(double repeats) {
        this(new LinearInterpolator(), repeats);
    }

    public RepeatInterpolator(Interpolator interpolator, double repeats) {
        this.interpolator = interpolator;
        this.repeats = repeats;
    }

    @Override
    public float getInterpolation(float v) {
        final double v1 = v % (1.0 / repeats);
        return interpolator.getInterpolation((float) (v1 * repeats));
    }
}

Example: new PulseInterpolator(3, 1)

new RepeatInterpolator(new PulseInterpolator(1, 1), 2)

new RepeatInterpolator(2.5)