am a99b2404: Merge "Tunings for touch ripple animations" into lmp-preview-dev

 */

class Ripple {

    private static final TimeInterpolator LINEAR_INTERPOLATOR = new LinearInterpolator();

    private static final TimeInterpolator DECEL_INTERPOLATOR = new DecelerateInterpolator(4);

    private static final TimeInterpolator DECEL_INTERPOLATOR = new LogInterpolator();

    private static final float GLOBAL_SPEED = 1.0f;

    private static final float WAVE_TOUCH_DOWN_ACCELERATION = 1024.0f * GLOBAL_SPEED;

    private static final float WAVE_TOUCH_UP_ACCELERATION = 3096.0f * GLOBAL_SPEED;

    private static final float WAVE_OPACITY_DECAY_VELOCITY = 1.9f / GLOBAL_SPEED;

    private static final float WAVE_OUTER_OPACITY_VELOCITY = 1.2f * GLOBAL_SPEED;

    private static final float WAVE_TOUCH_UP_ACCELERATION = 3400.0f * GLOBAL_SPEED;

    private static final float WAVE_OPACITY_DECAY_VELOCITY = 3.0f / GLOBAL_SPEED;

    private static final float WAVE_OUTER_OPACITY_VELOCITY_MAX = 4.5f * GLOBAL_SPEED;

    private static final float WAVE_OUTER_OPACITY_VELOCITY_MIN = 1.5f * GLOBAL_SPEED;

    private static final float WAVE_OUTER_SIZE_INFLUENCE_MAX = 200f;

    private static final float WAVE_OUTER_SIZE_INFLUENCE_MIN = 40f;

    private static final long RIPPLE_ENTER_DELAY = 100;

    private static final long RIPPLE_ENTER_DELAY = 80;

    // Hardware animators.

    private final ArrayList<RenderNodeAnimator> mRunningAnimations = new ArrayList<>();

    public void enter() {

        final int radiusDuration = (int)

                (1000 * Math.sqrt(mOuterRadius / WAVE_TOUCH_DOWN_ACCELERATION * mDensity) + 0.5);

        final int outerDuration = (int) (1000 * 1.0f / WAVE_OUTER_OPACITY_VELOCITY);

        final int outerDuration = (int) (1000 * 1.0f / WAVE_OUTER_OPACITY_VELOCITY_MIN);

        final ObjectAnimator radius = ObjectAnimator.ofFloat(this, "radiusGravity", 1);

        radius.setAutoCancel(true);

     */

    public void exit() {

        cancelSoftwareAnimations();

        final float radius = MathUtils.lerp(0, mOuterRadius, mTweenRadius);

        final float remaining;

        if (mAnimRadius != null && mAnimRadius.isRunning()) {

                + WAVE_TOUCH_DOWN_ACCELERATION) * mDensity) + 0.5);

        final int opacityDuration = (int) (1000 * mOpacity / WAVE_OPACITY_DECAY_VELOCITY + 0.5f);

        // Scale the outer max opacity and opacity velocity based

        // on the size of the outer radius

        float outerSizeInfluence = MathUtils.constrain(

                (mOuterRadius - WAVE_OUTER_SIZE_INFLUENCE_MIN * mDensity)

                / (WAVE_OUTER_SIZE_INFLUENCE_MAX * mDensity), 0, 1);

        float outerOpacityVelocity = MathUtils.lerp(WAVE_OUTER_OPACITY_VELOCITY_MIN,

                WAVE_OUTER_OPACITY_VELOCITY_MAX, outerSizeInfluence);

        // Determine at what time the inner and outer opacity intersect.

        // inner(t) = mOpacity - t * WAVE_OPACITY_DECAY_VELOCITY / 1000

        // outer(t) = mOuterOpacity + t * WAVE_OUTER_OPACITY_VELOCITY / 1000

        final int outerInflection = Math.max(0, (int) (1000 * (mOpacity - mOuterOpacity)

                / (WAVE_OPACITY_DECAY_VELOCITY + WAVE_OUTER_OPACITY_VELOCITY) + 0.5f));

                / (WAVE_OPACITY_DECAY_VELOCITY + outerOpacityVelocity) + 0.5f));

        final int inflectionOpacity = (int) (255 * (mOuterOpacity + outerInflection

                * WAVE_OUTER_OPACITY_VELOCITY / 1000) + 0.5f);

                * outerOpacityVelocity * outerSizeInfluence / 1000) + 0.5f);

        if (mCanUseHardware) {

            exitHardware(radiusDuration, opacityDuration, outerInflection, inflectionOpacity);

            removeSelf();

        }

    };

    /**

    * Interpolator with a smooth log deceleration

    */

    private static final class LogInterpolator implements TimeInterpolator {

        @Override

        public float getInterpolation(float input) {

            return 1 - (float) Math.pow(400, -input * 1.4);

        }

    }

}