Java Code Examples for com.facebook.rebound.SpringSystem#create()

The following examples show how to use com.facebook.rebound.SpringSystem#create() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: Floating.java    From FloatingView with Apache License 2.0 6 votes vote down vote up
public Floating(Activity activity){

        if (activity == null){
            throw new NullPointerException("Activity should not be null");
        }
        
        ViewGroup rootView = (ViewGroup) activity.findViewById(Window.ID_ANDROID_CONTENT);
        View decorView = rootView.findViewById(R.id.floating_decor);
        if (decorView instanceof  FloatingDecorView){
            mFloatingDecorView = (FloatingDecorView) decorView;
        }else {
            mFloatingDecorView = new FloatingDecorView(activity);
            mFloatingDecorView.setId(R.id.floating_decor);
            rootView.addView(mFloatingDecorView);
        }
        
        if (mSpringSystem == null){
            mSpringSystem = SpringSystem.create();
        }
        
    }
 
Example 2
Source File: YOLOComboView.java    From RxComboDetector with MIT License 6 votes vote down vote up
public YOLOComboView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    BaseSpringSystem springSystem = SpringSystem.create();
    mComboSpring = springSystem.createSpring();
    mComboSpring.setSpringConfig(SpringConfig.fromOrigamiTensionAndFriction(600, 9));

    mYOLOLogo = new ImageView(context);
    FrameLayout.LayoutParams params = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
            ViewGroup.LayoutParams.WRAP_CONTENT);
    mYOLOLogo.setLayoutParams(params);
    mYOLOLogo.setImageResource(R.drawable.ic_yolo);
    addView(mYOLOLogo);

    mComboText = new TextView(context);
    params = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
            ViewGroup.LayoutParams.WRAP_CONTENT, Gravity.RIGHT);
    params.rightMargin = 30;
    mComboText.setLayoutParams(params);
    mComboText.setTextColor(context.getResources().getColor(android.R.color.holo_red_light));
    mComboText.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);
    addView(mComboText);

    mSpringListener = new ComboSpringListener(mComboText);
    setAlpha(0);
}
 
Example 3
Source File: SwitchButton.java    From FimiX8-RE with MIT License 6 votes vote down vote up
public void setup(AttributeSet attrs) {
    this.paint = new Paint(1);
    this.paint.setStyle(Style.STROKE);
    this.paint.setStrokeCap(Cap.ROUND);
    this.springSystem = SpringSystem.create();
    this.spring = this.springSystem.createSpring();
    this.spring.setSpringConfig(SpringConfig.fromOrigamiTensionAndFriction(50.0d, 7.0d));
    setOnClickListener(new OnClickListener() {
        public void onClick(View arg0) {
            SwitchButton.this.onViewSwitch();
        }
    });
    TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.SwitchButton);
    this.onSpotColor = typedArray.getColor(R.styleable.SwitchButton_onColor, this.onSpotColor);
    this.offSpotColor = typedArray.getColor(R.styleable.SwitchButton_spotColor, this.offSpotColor);
    this.toggleOn = typedArray.getBoolean(R.styleable.SwitchButton_onToggle, this.toggleOn);
    this.spotColor = this.offSpotColor;
    this.borderWidth = typedArray.getDimensionPixelSize(R.styleable.SwitchButton_borderWidth, (int) AbViewUtil.dip2px(getContext(), (float) this.borderWidth));
    this.defaultAnimate = typedArray.getBoolean(R.styleable.SwitchButton_animate, this.defaultAnimate);
    typedArray.recycle();
}
 
Example 4
Source File: SpringFloatingActionMenu.java    From SpringFloatingActionMenu with Apache License 2.0 6 votes vote down vote up
private void applyBloomOpenAnimation() {
    final SpringSystem springSystem = SpringSystem.create();

    for (int i = 0; i < mMenuItemCount; i++) {
        // create the springs that control movement
        final Spring springX = springSystem.createSpring();
        final Spring springY = springSystem.createSpring();

        MenuItemView menuItemView = mMenuItemViews.get(i);
        springX.addListener(new MapPerformer(menuItemView, View.X, mFAB.getLeft(), menuItemView.getLeft()));
        springY.addListener(new MapPerformer(menuItemView, View.Y, mFAB.getTop(), menuItemView.getTop()));
        DestroySelfSpringListener destroySelfSpringListener = new DestroySelfSpringListener(this,mContainerView,true);
        springX.addListener(destroySelfSpringListener);
        springY.addListener(destroySelfSpringListener);
        springX.setEndValue(1);
        springY.setEndValue(1);
    }
}
 
Example 5
Source File: SpringFloatingActionMenu.java    From SpringFloatingActionMenu with Apache License 2.0 6 votes vote down vote up
private void applyBloomCloseAnimation() {
    final SpringSystem springSystem = SpringSystem.create();

    for (int i = 0; i < mMenuItemCount; i++) {
        // create the springs that control movement
        final Spring springX = springSystem.createSpring();
        final Spring springY = springSystem.createSpring();

        MenuItemView menuItemView = mMenuItemViews.get(i);
        springX.addListener(new MapPerformer(menuItemView, View.X, menuItemView.getLeft(), mFAB.getLeft()));
        springY.addListener(new MapPerformer(menuItemView, View.Y, menuItemView.getTop(), mFAB.getTop()));
        DestroySelfSpringListener destroySelfSpringListener = new DestroySelfSpringListener(this,mContainerView,false);
        springX.addListener(destroySelfSpringListener);
        springY.addListener(destroySelfSpringListener);
        springX.setEndValue(1);
        springY.setEndValue(1);
    }
}
 
Example 6
Source File: MenuItemView.java    From SpringFloatingActionMenu with Apache License 2.0 6 votes vote down vote up
private void applyPressAnimation() {
    SpringSystem springSystem = SpringSystem.create();
    final Spring spring = springSystem.createSpring();
    spring.addListener(new Performer(mBtn, View.SCALE_X));
    spring.addListener(new Performer(mBtn, View.SCALE_Y));
    mBtn.setOnTouchListener(new ToggleImitator(spring, 1, 1.2){
        @Override
        public void imitate(MotionEvent event) {
            super.imitate(event);
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    break;

                case MotionEvent.ACTION_UP:
                    callOnClick();
                    break;

                default:
            }
        }
    });
    spring.setCurrentValue(1);
}
 
Example 7
Source File: ToggleButton.java    From light-novel-library_Wenku8_Android with GNU General Public License v2.0 6 votes vote down vote up
public void setup(AttributeSet attrs) {
	paint = new Paint(Paint.ANTI_ALIAS_FLAG);
	paint.setStyle(Style.FILL);
	paint.setStrokeCap(Cap.ROUND);
	
	springSystem = SpringSystem.create();
	spring = springSystem.createSpring();
	spring.setSpringConfig(SpringConfig.fromOrigamiTensionAndFriction(50, 7));
	
	this.setOnClickListener(new OnClickListener() {
		@Override
		public void onClick(View arg0) {
			toggle();
		}
	});
	
	TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.ToggleButton);
	offBorderColor = typedArray.getColor(R.styleable.ToggleButton_offBorderColor, offBorderColor);
	onColor = typedArray.getColor(R.styleable.ToggleButton_onColor, onColor);
	spotColor = typedArray.getColor(R.styleable.ToggleButton_spotColor, spotColor);
	offColor = typedArray.getColor(R.styleable.ToggleButton_offColor, offColor);
	borderWidth = typedArray.getDimensionPixelSize(R.styleable.ToggleButton_borderWidth, borderWidth);
	typedArray.recycle();
}
 
Example 8
Source File: SpringHelper.java    From FloatingView with Apache License 2.0 5 votes vote down vote up
public void start(){
    SpringSystem springSystem = SpringSystem.create();
    Spring spring  = springSystem.createSpring();
    if (mConfig == 0){
        spring.setSpringConfig(SpringConfig.fromBouncinessAndSpeed(mConfigValueOne, mConfigValueTwo));
    }else if (mConfig == 1){
        spring.setSpringConfig(SpringConfig.fromOrigamiTensionAndFriction(mConfigValueOne, mConfigValueTwo));
    }
    start(spring);
}
 
Example 9
Source File: ToggleButton.java    From ToggleButton with MIT License 5 votes vote down vote up
public void setup(AttributeSet attrs) {
	paint = new Paint(Paint.ANTI_ALIAS_FLAG);
	paint.setStyle(Style.FILL);
	paint.setStrokeCap(Cap.ROUND);
	
	springSystem = SpringSystem.create();
	spring = springSystem.createSpring();
	spring.setSpringConfig(SpringConfig.fromOrigamiTensionAndFriction(50, 7));
	
	this.setOnClickListener(new OnClickListener() {
		@Override
		public void onClick(View arg0) {
			toggle(defaultAnimate);
		}
	});
	
	TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.ToggleButton);
	offBorderColor = typedArray.getColor(R.styleable.ToggleButton_tbOffBorderColor, offBorderColor);
	onColor = typedArray.getColor(R.styleable.ToggleButton_tbOnColor, onColor);
	spotColor = typedArray.getColor(R.styleable.ToggleButton_tbSpotColor, spotColor);
	offColor = typedArray.getColor(R.styleable.ToggleButton_tbOffColor, offColor);
	borderWidth = typedArray.getDimensionPixelSize(R.styleable.ToggleButton_tbBorderWidth, borderWidth);
	defaultAnimate = typedArray.getBoolean(R.styleable.ToggleButton_tbAnimate, defaultAnimate);
	isDefaultOn = typedArray.getBoolean(R.styleable.ToggleButton_tbAsDefaultOn, isDefaultOn);
	typedArray.recycle();
	
	borderColor = offBorderColor;

	if (isDefaultOn) {
		toggleOn();
	}
}
 
Example 10
Source File: MenuItemView.java    From SpringFloatingActionMenu with Apache License 2.0 5 votes vote down vote up
public void showLabel() {
    SpringSystem springSystem = SpringSystem.create();
    final Spring spring = springSystem.createSpring();
    spring.addListener(new MapPerformer(mLabel, View.SCALE_X, 0, 1));
    spring.addListener(new MapPerformer(mLabel, View.SCALE_Y, 0, 1));
    spring.setCurrentValue(0);
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            spring.setEndValue(1);
        }
    }, 200);
}
 
Example 11
Source File: SpringConfiguratorView.java    From light-novel-library_Wenku8_Android with GNU General Public License v2.0 5 votes vote down vote up
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public SpringConfiguratorView(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);

  SpringSystem springSystem = SpringSystem.create();
  springConfigRegistry = SpringConfigRegistry.getInstance();
  spinnerAdapter = new SpinnerAdapter(context);

  Resources resources = getResources();
  mRevealPx = dpToPx(40, resources);
  mStashPx = dpToPx(280, resources);

  mRevealerSpring = springSystem.createSpring();
  SpringListener revealerSpringListener = new RevealerSpringListener();
  mRevealerSpring
      .setCurrentValue(1)
      .setEndValue(1)
      .addListener(revealerSpringListener);

  addView(generateHierarchy(context));

  SeekbarListener seekbarListener = new SeekbarListener();
  mTensionSeekBar.setMax(MAX_SEEKBAR_VAL);
  mTensionSeekBar.setOnSeekBarChangeListener(seekbarListener);

  mFrictionSeekBar.setMax(MAX_SEEKBAR_VAL);
  mFrictionSeekBar.setOnSeekBarChangeListener(seekbarListener);

  mSpringSelectorSpinner.setAdapter(spinnerAdapter);
  mSpringSelectorSpinner.setOnItemSelectedListener(new SpringSelectedListener());
  refreshSpringConfigurations();

  this.setTranslationY(mStashPx);
}
 
Example 12
Source File: DefaultChatHeadManager.java    From springy-heads with Apache License 2.0 5 votes vote down vote up
private void init(Context context, ChatHeadConfig chatHeadDefaultConfig) {
    chatHeadContainer.onInitialized(this);
    DisplayMetrics metrics = new DisplayMetrics();
    WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    windowManager.getDefaultDisplay().getMetrics(metrics);
    this.displayMetrics = metrics;
    this.config = chatHeadDefaultConfig; //TODO : needs cleanup
    chatHeads = new ArrayList<>(5);
    arrowLayout = new UpArrowLayout(context);
    arrowLayout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
    chatHeadContainer.addView(arrowLayout, arrowLayout.getLayoutParams());
    arrowLayout.setVisibility(View.GONE);
    springSystem = SpringSystem.create();
    closeButton = new ChatHeadCloseButton(context, this, maxHeight, maxWidth);
    ViewGroup.LayoutParams layoutParams = chatHeadContainer.createLayoutParams(chatHeadDefaultConfig.getCloseButtonHeight(), chatHeadDefaultConfig.getCloseButtonWidth(), Gravity.TOP | Gravity.START, 0);
    closeButton.setListener(this);
    chatHeadContainer.addView(closeButton, layoutParams);
    closeButtonShadow = new ImageView(getContext());
    ViewGroup.LayoutParams shadowLayoutParams = chatHeadContainer.createLayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT, Gravity.BOTTOM, 0);
    closeButtonShadow.setImageResource(R.drawable.dismiss_shadow);
    closeButtonShadow.setVisibility(View.GONE);
    chatHeadContainer.addView(closeButtonShadow, shadowLayoutParams);
    arrangements.put(MinimizedArrangement.class, new MinimizedArrangement(this));
    arrangements.put(MaximizedArrangement.class, new MaximizedArrangement<T>(this));
    setupOverlay(context);
    setConfig(chatHeadDefaultConfig);
    SpringConfigRegistry.getInstance().addSpringConfig(SpringConfigsHolder.DRAGGING, "dragging mode");
    SpringConfigRegistry.getInstance().addSpringConfig(SpringConfigsHolder.NOT_DRAGGING, "not dragging mode");
}
 
Example 13
Source File: ExplosionFragment.java    From Backboard with Apache License 2.0 5 votes vote down vote up
@Override
public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	mHandler = new Handler();
	mSpringSystem = SpringSystem.create();

	mCoasting = SpringConfig.fromOrigamiTensionAndFriction(0, 0);
	mCoasting.tension = 0;

	// this is very much a hack, since the end value is set to 9001 to simulate constant
	// acceleration.
	mGravity = SpringConfig.fromOrigamiTensionAndFriction(0, 0);
	mGravity.tension = 1;
}
 
Example 14
Source File: SpringConfiguratorView.java    From KugouLayout with MIT License 5 votes vote down vote up
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public SpringConfiguratorView(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);

  SpringSystem springSystem = SpringSystem.create();
  springConfigRegistry = SpringConfigRegistry.getInstance();
  spinnerAdapter = new SpinnerAdapter(context);

  Resources resources = getResources();
  mRevealPx = dpToPx(40, resources);
  mStashPx = dpToPx(280, resources);

  mRevealerSpring = springSystem.createSpring();
  SpringListener revealerSpringListener = new RevealerSpringListener();
  mRevealerSpring
      .setCurrentValue(1)
      .setEndValue(1)
      .addListener(revealerSpringListener);

  addView(generateHierarchy(context));

  SeekbarListener seekbarListener = new SeekbarListener();
  mTensionSeekBar.setMax(MAX_SEEKBAR_VAL);
  mTensionSeekBar.setOnSeekBarChangeListener(seekbarListener);

  mFrictionSeekBar.setMax(MAX_SEEKBAR_VAL);
  mFrictionSeekBar.setOnSeekBarChangeListener(seekbarListener);

  mSpringSelectorSpinner.setAdapter(spinnerAdapter);
  mSpringSelectorSpinner.setOnItemSelectedListener(new SpringSelectedListener());
  refreshSpringConfigurations();

  this.setTranslationY(mStashPx);
}
 
Example 15
Source File: Magnet.java    From Magnet with MIT License 4 votes vote down vote up
@NonNull protected SpringSystem getSpringSystem() {
  return SpringSystem.create();
}
 
Example 16
Source File: ScaleFragment.java    From Backboard with Apache License 2.0 4 votes vote down vote up
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
	final View rootView = inflater.inflate(R.layout.fragment_scale, container, false);

	final View rect = rootView.findViewById(R.id.rect);

	final SpringSystem springSystem = SpringSystem.create();

	final Spring spring = springSystem.createSpring();

	spring.addListener(new Performer(rect, View.SCALE_X));
	spring.addListener(new Performer(rect, View.SCALE_Y));

	rootView.setOnTouchListener(new View.OnTouchListener() {
		@Override
		@SuppressLint("ClickableViewAccessibility")
		public boolean onTouch(View v, MotionEvent event) {
			switch (event.getAction()) {
			case MotionEvent.ACTION_DOWN:
				spring.setVelocity(0);

			case MotionEvent.ACTION_MOVE:

				// can't use Imitation here because there is no nice mapping from
				// an event property to a Spring
				float scaleX, scaleY;

				float delta = event.getX() - (rect.getX() + rect.getMeasuredWidth() / 2);
				scaleX = Math.abs(delta) / (rect.getMeasuredWidth() / 2);

				delta = event.getY() - (rect.getY() + rect.getMeasuredHeight() / 2);
				scaleY = Math.abs(delta) / (rect.getMeasuredHeight() / 2);

				float scale = Math.max(scaleX, scaleY);

				spring.setEndValue(scale);

				break;
			case MotionEvent.ACTION_UP:
				spring.setEndValue(1f);

				break;
			}

			return true;
		}
	});

	return rootView;
}
 
Example 17
Source File: BloomFragment.java    From Backboard with Apache License 2.0 4 votes vote down vote up
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
	mRootView = (RelativeLayout) inflater.inflate(R.layout.fragment_bloom, container, false);

	mCircles = new View[6];

	float diameter = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, DIAMETER,
			getResources().getDisplayMetrics());

	final TypedArray circles = getResources().obtainTypedArray(R.array.circles);

	// layout params
	RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams((int) diameter,
			(int) diameter);
	params.addRule(RelativeLayout.CENTER_IN_PARENT);

	// create the circle views
	int colorIndex = 0;
	for (int i = 0; i < mCircles.length; i++) {
		mCircles[i] = new View(getActivity());

		mCircles[i].setLayoutParams(params);

		mCircles[i].setBackgroundDrawable(getResources().getDrawable(circles
				.getResourceId(colorIndex, -1)));

		colorIndex++;
		if (colorIndex >= circles.length()) {
			colorIndex = 0;
		}

		mRootView.addView(mCircles[i]);
	}

	circles.recycle();

	/* Animations! */

	final SpringSystem springSystem = SpringSystem.create();

	// create spring
	final Spring spring = springSystem.createSpring();

	// add listeners along arc
	double arc = 2 * Math.PI / mCircles.length;

	for (int i = 0; i < mCircles.length; i++) {
		View view = mCircles[i];

		// map spring to a line segment from the center to the edge of the ring
		spring.addListener(new MapPerformer(view, View.TRANSLATION_X, 0, 1,
				0, (float) (RING_DIAMETER * Math.cos(i * arc))));

		spring.addListener(new MapPerformer(view, View.TRANSLATION_Y, 0, 1,
				0, (float) (RING_DIAMETER * Math.sin(i * arc))));

		spring.setEndValue(CLOSED);
	}

	mRootView.setOnTouchListener(new ToggleImitator(spring, CLOSED, OPEN));

	return mRootView;
}
 
Example 18
Source File: FlowerFragment.java    From Backboard with Apache License 2.0 4 votes vote down vote up
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

	mRootView = (RelativeLayout) inflater.inflate(R.layout.fragment_flower, container, false);

	mCircles = new View[6];
	mCircle = mRootView.findViewById(R.id.circle);

	final float diameter = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, DIAMETER,
			getResources().getDisplayMetrics());

	final TypedArray circles = getResources().obtainTypedArray(R.array.circles);

	// layout params
	final RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams((int) diameter,
			(int) diameter);
	params.addRule(RelativeLayout.CENTER_IN_PARENT);

	// create the circle views
	int colorIndex = 0;
	for (int i = 0; i < mCircles.length; i++) {
		mCircles[i] = new View(getActivity());

		mCircles[i].setLayoutParams(params);

		mCircles[i].setBackgroundDrawable(getResources().getDrawable(
				circles.getResourceId(colorIndex, -1)));

		colorIndex++;
		if (colorIndex >= circles.length()) {
			colorIndex = 0;
		}

		mRootView.addView(mCircles[i], 0);
	}

	circles.recycle();

	/* Animations! */

	final SpringSystem springSystem = SpringSystem.create();

	// create spring
	final Spring spring = springSystem.createSpring();

	// add listeners along arc
	final double arc = 2 * Math.PI / mCircles.length;

	for (int i = 0; i < mCircles.length; i++) {
		View view = mCircles[i];

		// map spring to a line segment from the center to the edge of the ring
		spring.addListener(new MapPerformer(view, View.TRANSLATION_X, 0, 1,
				0, (float) (RING_DIAMETER * Math.cos(i * arc))));

		spring.addListener(new MapPerformer(view, View.TRANSLATION_Y, 0, 1,
				0, (float) (RING_DIAMETER * Math.sin(i * arc))));

		spring.setEndValue(CLOSED);
	}

	final ToggleImitator imitator = new ToggleImitator(spring, CLOSED, OPEN);

	// move circle using finger, snap when near another circle, and bloom when touched
	new Actor.Builder(SpringSystem.create(), mCircle)
			.addMotion(new SnapImitator(MotionProperty.X), View.TRANSLATION_X)
			.addMotion(new SnapImitator(MotionProperty.Y), View.TRANSLATION_Y)
			.onTouchListener(imitator)
			.build();

	return mRootView;
}
 
Example 19
Source File: ReboundAnimation.java    From X-Alarm with GNU Affero General Public License v3.0 4 votes vote down vote up
private ReboundAnimation(){
    mSpringSystem = SpringSystem.create();
}
 
Example 20
Source File: SpringFloatingActionMenu.java    From SpringFloatingActionMenu with Apache License 2.0 4 votes vote down vote up
private void applyFollowAnimation() {
    /* Animation code */

    final SpringSystem springSystem = SpringSystem.create();

    // create the springs that control movement
    final Spring springX = springSystem.createSpring();
    final Spring springY = springSystem.createSpring();

    // bind circle movement to events
    new Actor.Builder(springSystem, mFAB)
            .addMotion(springX, Imitator.TRACK_DELTA, Imitator.FOLLOW_EXACT, MotionProperty.X)
            .addMotion(springY, Imitator.TRACK_DELTA, Imitator.FOLLOW_EXACT, MotionProperty.Y)
            .build();

    // add springs to connect between the views
    final Spring[] followsX = new Spring[mMenuItemCount];
    final Spring[] followsY = new Spring[mMenuItemCount];

    for (int i = 0; i < mFollowCircles.size(); i++) {

        // create spring to bind views
        followsX[i] = springSystem.createSpring();
        followsY[i] = springSystem.createSpring();
        followsX[i].addListener(new Performer(mFollowCircles.get(i), View.TRANSLATION_X));
        followsY[i].addListener(new Performer(mFollowCircles.get(i), View.TRANSLATION_Y));

        // imitates another character
        final SpringImitator followX = new SpringImitator(followsX[i]);
        final SpringImitator followY = new SpringImitator(followsY[i]);

        //  imitate the previous character
        if (i == 0) {
            springX.addListener(followX);
            springY.addListener(followY);
        } else {
            followsX[i - 1].addListener(followX);
            followsY[i - 1].addListener(followY);
        }
    }
}