Merge pull request #1865 from krisgiesing/velocity-dart

Move velocity tracker to dart

packages/flutter/lib/gestures.dart

@@ -10,8 +10,10 @@ export 'src/gestures/constants.dart';
 export 'src/gestures/drag.dart';
 export 'src/gestures/events.dart';
 export 'src/gestures/long_press.dart';
+export 'src/gestures/lsq_solver.dart';
 export 'src/gestures/pointer_router.dart';
 export 'src/gestures/recognizer.dart';
 export 'src/gestures/scale.dart';
 export 'src/gestures/show_press.dart';
 export 'src/gestures/tap.dart';
+export 'src/gestures/velocity_tracker.dart';

packages/flutter/lib/src/gestures/drag.dart

@@ -8,6 +8,7 @@ import 'arena.dart';
 import 'recognizer.dart';
 import 'constants.dart';
 import 'events.dart';
+import 'velocity_tracker.dart';
 
 enum DragState {
   ready,
@@ -25,9 +26,7 @@ typedef void GesturePanEndCallback(ui.Offset velocity);
 
 typedef void _GesturePolymorphicUpdateCallback<T>(T delta);
 
-int _eventTime(PointerInputEvent event) => (event.timeStamp * 1000.0).toInt(); // microseconds
-
-bool _isFlingGesture(ui.GestureVelocity velocity) {
+bool _isFlingGesture(GestureVelocity velocity) {
   double velocitySquared = velocity.x * velocity.x + velocity.y * velocity.y;
   return velocity.isValid &&
     velocitySquared > kMinFlingVelocity * kMinFlingVelocity &&
@@ -50,11 +49,11 @@ abstract class _DragGestureRecognizer<T extends dynamic> extends GestureRecogniz
   T _getDragDelta(PointerInputEvent event);
   bool get _hasSufficientPendingDragDeltaToAccept;
 
-  Map<int, ui.VelocityTracker> _velocityTrackers = new Map<int, ui.VelocityTracker>();
+  Map<int, VelocityTracker> _velocityTrackers = new Map<int, VelocityTracker>();
 
   void addPointer(PointerInputEvent event) {
     startTrackingPointer(event.pointer);
-    _velocityTrackers[event.pointer] = new ui.VelocityTracker();
+    _velocityTrackers[event.pointer] = new VelocityTracker();
     if (_state == DragState.ready) {
       _state = DragState.possible;
       _initialPosition = event.position;
@@ -65,9 +64,9 @@ abstract class _DragGestureRecognizer<T extends dynamic> extends GestureRecogniz
   void handleEvent(PointerInputEvent event) {
     assert(_state != DragState.ready);
     if (event.type == 'pointermove') {
-      ui.VelocityTracker tracker = _velocityTrackers[event.pointer];
+      VelocityTracker tracker = _velocityTrackers[event.pointer];
       assert(tracker != null);
-      tracker.addPosition(_eventTime(event), event.x, event.y);
+      tracker.addPosition(event.timeStamp, event.x, event.y);
       T delta = _getDragDelta(event);
       if (_state == DragState.accepted) {
         if (onUpdate != null)
@@ -102,10 +101,10 @@ abstract class _DragGestureRecognizer<T extends dynamic> extends GestureRecogniz
     bool wasAccepted = (_state == DragState.accepted);
     _state = DragState.ready;
     if (wasAccepted && onEnd != null) {
-      ui.VelocityTracker tracker = _velocityTrackers[pointer];
+      VelocityTracker tracker = _velocityTrackers[pointer];
       assert(tracker != null);
 
-      ui.GestureVelocity gestureVelocity = tracker.getVelocity();
+      GestureVelocity gestureVelocity = tracker.getVelocity();
       ui.Offset velocity = ui.Offset.zero;
       if (_isFlingGesture(gestureVelocity))
         velocity = new ui.Offset(gestureVelocity.x, gestureVelocity.y);

packages/flutter/lib/src/gestures/lsq_solver.dart

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import "dart:math" as math;
+import "dart:typed_data";
+
+class _Vector {
+  _Vector(int size)
+  : _offset = 0, _length = size, _elements = new Float64List(size);
+
+  _Vector.fromValues(List<double> values)
+  : _offset = 0, _length = values.length, _elements = values;
+
+  _Vector.fromVOL(List<double> values, int offset, int length)
+  : _offset = offset, _length = length, _elements = values;
+
+  int get length => _length;
+
+  operator [](int i) => _elements[i + _offset];
+  operator []=(int i, double value) => _elements[i + _offset] = value;
+
+  operator *(_Vector a) {
+    double result = 0.0;
+    for (int i = 0; i < _length; i++) {
+      result += this[i] * a[i];
+    }
+    return result;
+  }
+
+  double norm() => math.sqrt(this * this);
+
+  String toString() {
+    String result = "";
+    for (int i = 0; i < _length; i++) {
+      if (i > 0)
+        result += ", ";
+        result += this[i].toString();
+    }
+    return result;
+  }
+
+  final int _offset;
+  final int _length;
+  final List<double> _elements;
+}
+
+class _Matrix {
+  _Matrix(int rows, int cols)
+  : _rows = rows,
+    _columns = cols,
+    _elements = new Float64List(rows * cols);
+
+  double get(int row, int col) => _elements[row * _columns + col];
+  void set(int row, int col, double value) {
+    _elements[row * _columns + col] = value;
+  }
+
+  _Vector getRow(int row) => new _Vector.fromVOL(
+    _elements,
+    row * _columns,
+    _columns
+  );
+
+  String toString() {
+    String result = "";
+    for (int i = 0; i < _rows; i++) {
+      if (i > 0)
+        result += "; ";
+      for (int j = 0; j < _columns; j++) {
+        if (j > 0)
+          result += ", ";
+        result += get(i, j).toString();
+      }
+    }
+    return result;
+  }
+
+  final int _rows;
+  final int _columns;
+  final List<double> _elements;
+}
+
+class PolynomialFit {
+  PolynomialFit(int degree) : coefficients = new Float64List(degree + 1);
+
+  final List<double> coefficients;
+  double confidence;
+}
+
+class LeastSquaresSolver {
+  LeastSquaresSolver(this.x, this.y, this.w) {
+    assert(x.length == y.length);
+    assert(y.length == w.length);
+  }
+
+  final List<double> x;
+  final List<double> y;
+  final List<double> w;
+
+  PolynomialFit solve(int degree) {
+    if (degree > x.length) // not enough data to fit a curve
+      return null;
+
+    PolynomialFit result = new PolynomialFit(degree);
+
+    // Shorthands for the purpose of notation equivalence to original C++ code
+    final int m = x.length;
+    final int n = degree + 1;
+
+    // Expand the X vector to a matrix A, pre-multiplied by the weights.
+    _Matrix a = new _Matrix(n, m);
+    for (int h = 0; h < m; h++) {
+      a.set(0, h, w[h]);
+      for (int i = 1; i < n; i++) {
+        a.set(i, h, a.get(i - 1, h) * x[h]);
+      }
+    }
+
+    // Apply the Gram-Schmidt process to A to obtain its QR decomposition.
+
+    // Orthonormal basis, column-major ordVectorer.
+    _Matrix q = new _Matrix(n, m);
+    // Upper triangular matrix, row-major order.
+    _Matrix r = new _Matrix(n, n);
+    for (int j = 0; j < n; j++) {
+      for (int h = 0; h < m; h++) {
+        q.set(j, h, a.get(j, h));
+      }
+      for (int i = 0; i < j; i++) {
+        double dot = q.getRow(j) * q.getRow(i);
+        for (int h = 0; h < m; h++) {
+          q.set(j, h, q.get(j, h) - dot * q.get(i, h));
+        }
+      }
+
+      double norm = q.getRow(j).norm();
+      if (norm < 0.000001) {
+        // vectors are linearly dependent or zero so no solution
+        return null;
+      }
+
+      double inverseNorm = 1.0 / norm;
+      for (int h = 0; h < m; h++) {
+        q.set(j, h, q.get(j, h) * inverseNorm);
+      }
+      for (int i = 0; i < n; i++) {
+        r.set(j, i, i < j ? 0.0 : q.getRow(j) * a.getRow(i));
+      }
+    }
+
+    // Solve R B = Qt W Y to find B.  This is easy because R is upper triangular.
+    // We just work from bottom-right to top-left calculating B's coefficients.
+    _Vector wy = new _Vector(m);
+    for (int h = 0; h < m; h++) {
+      wy[h] = y[h] * w[h];
+    }
+    for (int i = n; i-- != 0;) {
+      result.coefficients[i] = q.getRow(i) * wy;
+      for (int j = n - 1; j > i; j--) {
+        result.coefficients[i] -= r.get(i, j) * result.coefficients[j];
+      }
+      result.coefficients[i] /= r.get(i, i);
+    }
+
+    // Calculate the coefficient of determination (confidence) as:
+    // 1 - (sumSquaredError / sumSquaredTotal)
+    // where sumSquaredError is the residual sum of squares (variance of the
+    // error), and sumSquaredTotal is the total sum of squares (variance of the
+    // data) where each has been weighted.
+    double yMean = 0.0;
+    for (int h = 0; h < m; h++) {
+      yMean += y[h];
+    }
+    yMean /= m;
+
+    double sumSquaredError = 0.0;
+    double sumSquaredTotal = 0.0;
+    for (int h = 0; h < m; h++) {
+      double err = y[h] - result.coefficients[0];
+      double term = 1.0;
+      for (int i = 1; i < n; i++) {
+        term *= x[h];
+        err -= term * result.coefficients[i];
+      }
+      sumSquaredError += w[h] * w[h] * err * err;
+      double v = y[h] - yMean;
+      sumSquaredTotal += w[h] * w[h] * v * v;
+    }
+
+    result.confidence = sumSquaredTotal > 0.000001 ?
+      1.0 - (sumSquaredError / sumSquaredTotal) :
+      1.0;
+
+    return result;
+  }
+
+}

packages/flutter/lib/src/gestures/velocity_tracker.dart

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:ui' as ui;
+
+import 'lsq_solver.dart';
+
+class GestureVelocity {
+  GestureVelocity({ this.isValid: false, this.x: 0.0, this.y : 0.0 });
+
+  final bool isValid;
+  final double x;
+  final double y;
+}
+
+class _Estimator {
+  int degree;
+  double time;
+  List<double> xCoefficients;
+  List<double> yCoefficients;
+  double confidence;
+
+  String toString() {
+    String result = "Estimator(degree: " + degree.toString();
+    result +=  ", time: " + time.toString();
+    result +=  ", confidence: " + confidence.toString();
+    result +=  ", xCoefficients: " + xCoefficients.toString();
+    result +=  ", yCoefficients: " + yCoefficients.toString();
+    return result;
+  }
+}
+
+abstract class _VelocityTrackerStrategy {
+  void addMovement(double timeStamp, double x, double y);
+  bool getEstimator(_Estimator estimator);
+  void clear();
+}
+
+enum _Weighting {
+  weightingNone,
+  weightingDelta,
+  weightingCentral,
+  weightingRecent
+}
+
+class _Movement {
+  double eventTime = 0.0;
+  ui.Point position = ui.Point.origin;
+}
+
+class _LeastSquaresVelocityTrackerStrategy extends _VelocityTrackerStrategy {
+  static const int kHistorySize = 20;
+  static const int kHorizonMilliseconds = 100;
+
+  _LeastSquaresVelocityTrackerStrategy(this.degree, this.weighting)
+  : _index = 0, _movements = new List<_Movement>(kHistorySize);
+
+  final int degree;
+  final _Weighting weighting;
+  final List<_Movement> _movements;
+  int _index;
+
+  void addMovement(double timeStamp, double x, double y) {
+    if (++_index == kHistorySize)
+      _index = 0;
+    _Movement movement = _getMovement(_index);
+    movement.eventTime = timeStamp;
+    movement.position = new ui.Point(x, y);
+  }
+
+  bool getEstimator(_Estimator estimator) {
+    // Iterate over movement samples in reverse time order and collect samples.
+    List<double> x = new List<double>();
+    List<double> y = new List<double>();
+    List<double> w = new List<double>();
+    List<double> time = new List<double>();
+    int m = 0;
+    int index = _index;
+    _Movement newestMovement = _getMovement(index);
+    do {
+      _Movement movement = _getMovement(index);
+
+      double age = newestMovement.eventTime - movement.eventTime;
+      if (age > kHorizonMilliseconds)
+        break;
+
+      ui.Point position = movement.position;
+      x.add(position.x);
+      y.add(position.y);
+      w.add(_chooseWeight(index));
+      time.add(-age);
+      index = (index == 0 ? kHistorySize : index) - 1;
+    } while (++m < kHistorySize);
+
+    if (m == 0)
+      return false;  // no data
+
+    // Calculate a least squares polynomial fit.
+    int n = degree;
+    if (n > m - 1)
+      n = m - 1;
+
+    if (n >= 1) {
+      LeastSquaresSolver xSolver = new LeastSquaresSolver(time, x, w);
+      PolynomialFit xFit = xSolver.solve(n);
+      if (xFit != null) {
+        LeastSquaresSolver ySolver = new LeastSquaresSolver(time, y, w);
+        PolynomialFit yFit = ySolver.solve(n);
+        if (yFit != null) {
+          estimator.xCoefficients = xFit.coefficients;
+          estimator.yCoefficients = yFit.coefficients;
+          estimator.time = newestMovement.eventTime;
+          estimator.degree = n;
+          estimator.confidence = xFit.confidence * yFit.confidence;
+          return true;
+        }
+      }
+    }
+
+    // No velocity data available for this pointer, but we do have its current
+    // position.
+    estimator.xCoefficients = [ x[0] ];
+    estimator.yCoefficients = [ y[0] ];
+    estimator.time = newestMovement.eventTime;
+    estimator.degree = 0;
+    estimator.confidence = 1.0;
+    return true;
+  }
+
+  void clear() {
+    _index = -1;
+  }
+
+  double _chooseWeight(int index) {
+    switch (weighting) {
+      case _Weighting.weightingDelta:
+        // Weight points based on how much time elapsed between them and the next
+        // point so that points that "cover" a shorter time span are weighed less.
+        //   delta  0ms: 0.5
+        //   delta 10ms: 1.0
+        if (index == _index) {
+          return 1.0;
+        }
+        int nextIndex = (index + 1) % kHistorySize;
+        double deltaMilliseconds = _movements[nextIndex].eventTime -
+          _movements[index].eventTime;
+        if (deltaMilliseconds < 0)
+          return 0.5;
+        if (deltaMilliseconds < 10)
+          return 0.5 + deltaMilliseconds * 0.05;
+
+        return 1.0;
+
+      case _Weighting.weightingCentral:
+        // Weight points based on their age, weighing very recent and very old
+        // points less.
+        //   age  0ms: 0.5
+        //   age 10ms: 1.0
+        //   age 50ms: 1.0
+        //   age 60ms: 0.5
+        double ageMilliseconds = _movements[_index].eventTime -
+          _movements[index].eventTime;
+        if (ageMilliseconds < 0)
+          return 0.5;
+        if (ageMilliseconds < 10)
+          return 0.5 + ageMilliseconds * 0.05;
+        if (ageMilliseconds < 50)
+          return 1.0;
+        if (ageMilliseconds < 60)
+          return 0.5 + (60 - ageMilliseconds) * 0.05;
+
+        return 0.5;
+
+      case _Weighting.weightingRecent:
+        // Weight points based on their age, weighing older points less.
+        //   age   0ms: 1.0
+        //   age  50ms: 1.0
+        //   age 100ms: 0.5
+        double ageMilliseconds = _movements[_index].eventTime -
+          _movements[index].eventTime;
+        if (ageMilliseconds < 50) {
+          return 1.0;
+        }
+        if (ageMilliseconds < 100) {
+          return 0.5 + (100 - ageMilliseconds) * 0.01;
+        }
+        return 0.5;
+
+      case _Weighting.weightingNone:
+      default:
+        return 1.0;
+    }
+  }
+
+  _Movement _getMovement(int i) {
+      _Movement result = _movements[i];
+      if (result == null) {
+        result = new _Movement();
+        _movements[i] = result;
+      }
+      return result;
+  }
+
+}
+
+class VelocityTracker {
+  static const int kAssumePointerMoveStoppedTimeMs = 40;
+
+  VelocityTracker() : _lastTimeStamp = 0.0, _strategy = _createStrategy();
+
+  double _lastTimeStamp;
+  _VelocityTrackerStrategy _strategy;
+
+  void addPosition(double timeStamp, double x, double y) {
+    if ((timeStamp - _lastTimeStamp) >= kAssumePointerMoveStoppedTimeMs)
+      _strategy.clear();
+    _lastTimeStamp = timeStamp;
+    _strategy.addMovement(timeStamp, x, y);
+  }
+
+  GestureVelocity getVelocity() {
+    _Estimator estimator = new _Estimator();
+    if (_strategy.getEstimator(estimator) && estimator.degree >= 1) {
+      // convert from pixels/ms to pixels/s
+      return new GestureVelocity(
+        isValid: true,
+        x: estimator.xCoefficients[1] * 1000,
+        y: estimator.yCoefficients[1] * 1000
+      );
+    }
+    return new GestureVelocity(isValid: false, x: 0.0, y: 0.0);
+  }
+
+  static _VelocityTrackerStrategy _createStrategy() {
+    return new _LeastSquaresVelocityTrackerStrategy(2, _Weighting.weightingNone);
+  }
+}

packages/flutter/lib/src/widgets/event_recorder.dart

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/gestures.dart';
+import 'package:flutter/rendering.dart';
+
+import 'basic.dart';
+import 'framework.dart';
+
+enum EventRecorderMode {
+  stop,
+  record
+}
+
+typedef void EventsReadyCallback(List<PointerInputEvent> events);
+
+/// EventRecorder is a utility widget that allows input events occurring
+/// on the child to be recorded. The widget is initially in the "stop" state
+/// by default. When in the "record" state, all pointer input events
+/// occurring on the child are recorded into a buffer. When the "stop" state
+/// is entered again, the onEventsReady callback is invoked with a list of
+/// the recorded events.
+class EventRecorder extends StatefulComponent {
+  EventRecorder({
+    Key key,
+    this.child,
+    this.mode: EventRecorderMode.stop,
+    this.onEventsReady
+  });
+
+  final Widget child;
+  final EventRecorderMode mode;
+  final EventsReadyCallback onEventsReady;
+
+  _EventRecorderState createState() => new _EventRecorderState();
+}
+
+class _EventRecorderState extends State<EventRecorder> {
+
+  List<PointerInputEvent> _events = new List<PointerInputEvent>();
+
+  void initState() {
+    super.initState();
+  }
+
+  void didUpdateConfig(EventRecorder oldConfig) {
+    if (oldConfig.mode == EventRecorderMode.record &&
+        config.mode == EventRecorderMode.stop) {
+      config.onEventsReady(_events);
+      _events.clear();
+    }
+  }
+
+  void _recordEvent(PointerInputEvent event) {
+    if (config.mode == EventRecorderMode.record) {
+      _events.add(event);
+    }
+  }
+
+  Widget build(BuildContext context) {
+    return new Listener(
+      onPointerDown: _recordEvent,
+      onPointerMove: _recordEvent,
+      onPointerUp: _recordEvent,
+      onPointerCancel: _recordEvent,
+      child: config.child
+    );
+  }
+
+}

packages/flutter/lib/widgets.dart

@@ -12,6 +12,7 @@ export 'src/widgets/dismissable.dart';
 export 'src/widgets/drag_target.dart';
 export 'src/widgets/editable_text.dart';
 export 'src/widgets/enter_exit_transition.dart';
+export 'src/widgets/event_recorder.dart';
 export 'src/widgets/focus.dart';
 export 'src/widgets/framework.dart';
 export 'src/widgets/gesture_detector.dart';

packages/unit/benchmark/README.md

+Benchmarks
+==========
+This directory (and its sub-directories) contain benchmarks for Flutter.
+The reporting format for benchmarks is not standardized yet, so benchmarks
+here are typically run by hand. To run a particular benchmark, use a command
+similar to that used to run individual unit tests. For example:
+
+```
+sky/tools/run_tests --debug -r expanded benchmark/gestures/velocity_tracker_bench.dart
+```
+
+(The `-r expanded` flag prints one line per test, which can be more helpful
+than the default format when running individual tests.)

packages/unit/benchmark/gestures/velocity_tracker_bench.dart

+import 'dart:ui' as ui;
+
+import 'package:flutter/gestures.dart';
+import 'package:test/test.dart';
+import 'velocity_tracker_data.dart';
+
+const int kNumIters = 10000;
+const int kBatchSize = 1000;
+const int kBatchOffset = 50;
+const int kNumMarks = 130;
+
+List<PointerInputEvent> _eventFromMap(List<Map> intermediate) {
+  List<PointerInputEvent> events = new List<PointerInputEvent>();
+  for (Map entry in intermediate)
+    events.add(_eventFor(entry));
+  return events;
+}
+
+PointerInputEvent _eventFor(Map entry) {
+  PointerInputEvent result = new PointerInputEvent(
+    type: entry['type'],
+    timeStamp: entry['timeStamp'],
+    pointer: entry['pointer'],
+    x: entry['x'],
+    y: entry['y']
+  );
+  return result;
+}
+
+void main() {
+  List<PointerInputEvent> events = _eventFromMap(velocityEventData);
+
+  test('Dart velocity tracker performance', () {
+    VelocityTracker tracker = new VelocityTracker();
+    Stopwatch watch = new Stopwatch();
+    watch.start();
+    for (int i = 0; i < kNumIters; i++) {
+      for (PointerInputEvent event in events) {
+        if (event.type == 'pointerdown' || event.type == 'pointermove')
+          tracker.addPosition(event.timeStamp, event.x, event.y);
+        if (event.type == 'pointerup')
+          tracker.getVelocity();
+      }
+    }
+    watch.stop();
+    print("Dart tracker: " + watch.elapsed.toString());
+  });
+
+  test('Native velocity tracker performance', () {
+    ui.VelocityTracker tracker = new ui.VelocityTracker();
+    Stopwatch watch = new Stopwatch();
+    watch.start();
+    for (int i = 0; i < kNumIters; i++) {
+      for (PointerInputEvent event in events) {
+        if (event.type == 'pointerdown' || event.type == 'pointermove')
+          tracker.addPosition((event.timeStamp*1000.0).toInt(), event.x, event.y);
+        if (event.type == 'pointerup')
+          tracker.getVelocity();
+      }
+    }
+    watch.stop();
+    print("Native tracker: " + watch.elapsed.toString());
+  });
+}

packages/unit/benchmark/gestures/velocity_tracker_data.dart

+final List<Map> velocityEventData = [
+  {
+    "type":"pointerdown",
+    "timeStamp":216690896.0,
+    "pointer":1,
+    "x":270.0,
+    "y":538.2857055664062
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690906.0,
+    "pointer":1,
+    "x":270.0,
+    "y":538.2857055664062
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690951.0,
+    "pointer":1,
+    "x":270.0,
+    "y":530.8571166992188
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690959.0,
+    "pointer":1,
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+    "x":235.7142791748047,
+    "y":371.71429443359375
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695414.0,
+    "pointer":7,
+    "x":232.2857208251953,
+    "y":386.8571472167969
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695421.0,
+    "pointer":7,
+    "x":229.42857360839844,
+    "y":402.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695429.0,
+    "pointer":7,
+    "x":227.42857360839844,
+    "y":416.8571472167969
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695437.0,
+    "pointer":7,
+    "x":226.2857208251953,
+    "y":431.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695444.0,
+    "pointer":7,
+    "x":226.2857208251953,
+    "y":446.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695452.0,
+    "pointer":7,
+    "x":227.7142791748047,
+    "y":460.28570556640625
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695459.0,
+    "pointer":7,
+    "x":230.0,
+    "y":475.1428527832031
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695467.0,
+    "pointer":7,
+    "x":232.2857208251953,
+    "y":489.71429443359375
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695475.0,
+    "pointer":7,
+    "x":235.7142791748047,
+    "y":504.0
+  },
+  {
+    "type":"pointerup",
+    "timeStamp":216695490.0,
+    "pointer":7,
+    "x":235.7142791748047,
+    "y":504.0
+  },
+  {
+    "type":"pointerdown",
+    "timeStamp":216695885.0,
+    "pointer":8,
+    "x":238.85714721679688,
+    "y":524.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695908.0,
+    "pointer":8,
+    "x":236.2857208251953,
+    "y":515.7142944335938
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695916.0,
+    "pointer":8,
+    "x":234.85714721679688,
+    "y":509.1428527832031
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695924.0,
+    "pointer":8,
+    "x":232.57142639160156,
+    "y":498.5714416503906
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695931.0,
+    "pointer":8,
+    "x":230.57142639160156,
+    "y":483.71429443359375
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695939.0,
+    "pointer":8,
+    "x":229.14285278320312,
+    "y":466.5714416503906
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695947.0,
+    "pointer":8,
+    "x":229.14285278320312,
+    "y":446.5714416503906
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695955.0,
+    "pointer":8,
+    "x":230.57142639160156,
+    "y":424.8571472167969
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695963.0,
+    "pointer":8,
+    "x":232.57142639160156,
+    "y":402.28570556640625
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695970.0,
+    "pointer":8,
+    "x":235.14285278320312,
+    "y":380.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216695978.0,
+    "pointer":8,
+    "x":238.57142639160156,
+    "y":359.4285583496094
+  },
+  {
+    "type":"pointerup",
+    "timeStamp":216695993.0,
+    "pointer":8,
+    "x":238.57142639160156,
+    "y":359.4285583496094
+  },
+  {
+    "type":"pointerdown",
+    "timeStamp":216696429.0,
+    "pointer":9,
+    "x":238.2857208251953,
+    "y":568.5714111328125
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216696459.0,
+    "pointer":9,
+    "x":234.0,
+    "y":560.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216696467.0,
+    "pointer":9,
+    "x":231.42857360839844,
+    "y":553.1428833007812
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216696475.0,
+    "pointer":9,
+    "x":228.2857208251953,
+    "y":543.1428833007812
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216696483.0,
+    "pointer":9,
+    "x":225.42857360839844,
+    "y":528.8571166992188
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216696491.0,
+    "pointer":9,
+    "x":223.14285278320312,
+    "y":512.2857055664062
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216696498.0,
+    "pointer":9,
+    "x":222.0,
+    "y":495.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216696506.0,
+    "pointer":9,
+    "x":221.7142791748047,
+    "y":477.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216696514.0,
+    "pointer":9,
+    "x":221.7142791748047,
+    "y":458.28570556640625
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216696521.0,
+    "pointer":9,
+    "x":223.14285278320312,
+    "y":438.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216696529.0,
+    "pointer":9,
+    "x":224.2857208251953,
+    "y":416.28570556640625
+  },
+  {
+    "type":"pointerup",
+    "timeStamp":216696544.0,
+    "pointer":9,
+    "x":224.2857208251953,
+    "y":416.28570556640625
+  },
+  {
+    "type":"pointerdown",
+    "timeStamp":216696974.0,
+    "pointer":10,
+    "x":218.57142639160156,
+    "y":530.5714111328125
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697012.0,
+    "pointer":10,
+    "x":220.2857208251953,
+    "y":522.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697020.0,
+    "pointer":10,
+    "x":221.14285278320312,
+    "y":517.7142944335938
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697028.0,
+    "pointer":10,
+    "x":222.2857208251953,
+    "y":511.71429443359375
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697036.0,
+    "pointer":10,
+    "x":224.0,
+    "y":504.28570556640625
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697044.0,
+    "pointer":10,
+    "x":227.14285278320312,
+    "y":490.5714416503906
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697052.0,
+    "pointer":10,
+    "x":229.42857360839844,
+    "y":474.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697059.0,
+    "pointer":10,
+    "x":231.42857360839844,
+    "y":454.5714416503906
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697067.0,
+    "pointer":10,
+    "x":233.7142791748047,
+    "y":431.1428527832031
+  },
+  {
+    "type":"pointerup",
+    "timeStamp":216697082.0,
+    "pointer":10,
+    "x":233.7142791748047,
+    "y":431.1428527832031
+  },
+  {
+    "type":"pointerdown",
+    "timeStamp":216697435.0,
+    "pointer":11,
+    "x":257.1428527832031,
+    "y":285.1428527832031
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697465.0,
+    "pointer":11,
+    "x":251.7142791748047,
+    "y":296.8571472167969
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697473.0,
+    "pointer":11,
+    "x":248.2857208251953,
+    "y":304.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697481.0,
+    "pointer":11,
+    "x":244.57142639160156,
+    "y":314.8571472167969
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697489.0,
+    "pointer":11,
+    "x":240.2857208251953,
+    "y":329.1428527832031
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697497.0,
+    "pointer":11,
+    "x":236.85714721679688,
+    "y":345.1428527832031
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697505.0,
+    "pointer":11,
+    "x":233.7142791748047,
+    "y":361.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697512.0,
+    "pointer":11,
+    "x":231.14285278320312,
+    "y":378.28570556640625
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697520.0,
+    "pointer":11,
+    "x":229.42857360839844,
+    "y":395.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697528.0,
+    "pointer":11,
+    "x":229.42857360839844,
+    "y":412.8571472167969
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697535.0,
+    "pointer":11,
+    "x":230.85714721679688,
+    "y":430.8571472167969
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697543.0,
+    "pointer":11,
+    "x":233.42857360839844,
+    "y":449.71429443359375
+  },
+  {
+    "type":"pointerup",
+    "timeStamp":216697558.0,
+    "pointer":11,
+    "x":233.42857360839844,
+    "y":449.71429443359375
+  },
+  {
+    "type":"pointerdown",
+    "timeStamp":216697749.0,
+    "pointer":12,
+    "x":246.0,
+    "y":311.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697780.0,
+    "pointer":12,
+    "x":244.57142639160156,
+    "y":318.28570556640625
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697787.0,
+    "pointer":12,
+    "x":243.14285278320312,
+    "y":325.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697795.0,
+    "pointer":12,
+    "x":241.42857360839844,
+    "y":336.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697803.0,
+    "pointer":12,
+    "x":239.7142791748047,
+    "y":351.1428527832031
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697811.0,
+    "pointer":12,
+    "x":238.2857208251953,
+    "y":368.5714416503906
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697819.0,
+    "pointer":12,
+    "x":238.0,
+    "y":389.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697826.0,
+    "pointer":12,
+    "x":239.14285278320312,
+    "y":412.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697834.0,
+    "pointer":12,
+    "x":242.2857208251953,
+    "y":438.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697842.0,
+    "pointer":12,
+    "x":247.42857360839844,
+    "y":466.8571472167969
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216697849.0,
+    "pointer":12,
+    "x":254.2857208251953,
+    "y":497.71429443359375
+  },
+  {
+    "type":"pointerup",
+    "timeStamp":216697864.0,
+    "pointer":12,
+    "x":254.2857208251953,
+    "y":497.71429443359375
+  },
+  {
+    "type":"pointerdown",
+    "timeStamp":216698321.0,
+    "pointer":13,
+    "x":250.0,
+    "y":306.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216698328.0,
+    "pointer":13,
+    "x":250.0,
+    "y":306.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216698344.0,
+    "pointer":13,
+    "x":249.14285278320312,
+    "y":314.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216698351.0,
+    "pointer":13,
+    "x":247.42857360839844,
+    "y":319.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216698359.0,
+    "pointer":13,
+    "x":245.14285278320312,
+    "y":326.8571472167969
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216698366.0,
+    "pointer":13,
+    "x":241.7142791748047,
+    "y":339.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216698374.0,
+    "pointer":13,
+    "x":238.57142639160156,
+    "y":355.71429443359375
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216698382.0,
+    "pointer":13,
+    "x":236.2857208251953,
+    "y":374.28570556640625
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216698390.0,
+    "pointer":13,
+    "x":235.14285278320312,
+    "y":396.5714416503906
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216698398.0,
+    "pointer":13,
+    "x":236.57142639160156,
+    "y":421.4285583496094
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216698406.0,
+    "pointer":13,
+    "x":241.14285278320312,
+    "y":451.4285583496094
+  },
+  {
+    "type":"pointerup",
+    "timeStamp":216698421.0,
+    "pointer":13,
+    "x":241.14285278320312,
+    "y":451.4285583496094
+  }
+];

packages/unit/test/gestures/lsq_solver_test.dart

+import 'package:flutter/gestures.dart';
+import 'package:test/test.dart';
+
+
+void main() {
+  approx(double value, double expectation) {
+    const double eps = 1e-6;
+    return (value - expectation).abs() < eps;
+  }
+
+  test('Least-squares fit: linear polynomial to line', () {
+    List<double> x = [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0];
+    List<double> y = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
+    List<double> w = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
+
+    LeastSquaresSolver solver = new LeastSquaresSolver(x, y, w);
+    PolynomialFit fit = solver.solve(1);
+
+    expect(fit.coefficients.length, 2);
+    expect(approx(fit.coefficients[0], 1.0), isTrue);
+    expect(approx(fit.coefficients[1], 0.0), isTrue);
+    expect(approx(fit.confidence, 1.0), isTrue);
+  });
+
+  test('Least-squares fit: linear polynomial to sloped line', () {
+    List<double> x = [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0];
+    List<double> y = [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0];
+    List<double> w = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
+
+    LeastSquaresSolver solver = new LeastSquaresSolver(x, y, w);
+    PolynomialFit fit = solver.solve(1);
+
+    expect(fit.coefficients.length, 2);
+    expect(approx(fit.coefficients[0], 1.0), isTrue);
+    expect(approx(fit.coefficients[1], 1.0), isTrue);
+    expect(approx(fit.confidence, 1.0), isTrue);
+  });
+
+  test('Least-squares fit: quadratic polynomial to line', () {
+    List<double> x = [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0];
+    List<double> y = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
+    List<double> w = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
+
+    LeastSquaresSolver solver = new LeastSquaresSolver(x, y, w);
+    PolynomialFit fit = solver.solve(2);
+
+    expect(fit.coefficients.length, 3);
+    expect(approx(fit.coefficients[0], 1.0), isTrue);
+    expect(approx(fit.coefficients[1], 0.0), isTrue);
+    expect(approx(fit.coefficients[2], 0.0), isTrue);
+    expect(approx(fit.confidence, 1.0), isTrue);
+  });
+
+  test('Least-squares fit: quadratic polynomial to sloped line', () {
+    List<double> x = [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0];
+    List<double> y = [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0];
+    List<double> w = [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0];
+
+    LeastSquaresSolver solver = new LeastSquaresSolver(x, y, w);
+    PolynomialFit fit = solver.solve(2);
+
+    expect(fit.coefficients.length, 3);
+    expect(approx(fit.coefficients[0], 1.0), isTrue);
+    expect(approx(fit.coefficients[1], 1.0), isTrue);
+    expect(approx(fit.coefficients[2], 0.0), isTrue);
+    expect(approx(fit.confidence, 1.0), isTrue);
+  });
+
+}

packages/unit/test/gestures/velocity_tracker_data.dart

+final List<Map> velocityEventData = [
+  {
+    "type":"pointerdown",
+    "timeStamp":216690896.0,
+    "pointer":1,
+    "x":270.0,
+    "y":538.2857055664062
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690906.0,
+    "pointer":1,
+    "x":270.0,
+    "y":538.2857055664062
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690951.0,
+    "pointer":1,
+    "x":270.0,
+    "y":530.8571166992188
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690959.0,
+    "pointer":1,
+    "x":270.0,
+    "y":526.8571166992188
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690967.0,
+    "pointer":1,
+    "x":270.0,
+    "y":521.4285888671875
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690975.0,
+    "pointer":1,
+    "x":270.0,
+    "y":515.4285888671875
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690983.0,
+    "pointer":1,
+    "x":270.0,
+    "y":506.8571472167969
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690991.0,
+    "pointer":1,
+    "x":268.8571472167969,
+    "y":496.0
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216690998.0,
+    "pointer":1,
+    "x":267.4285583496094,
+    "y":483.1428527832031
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216691006.0,
+    "pointer":1,
+    "x":266.28570556640625,
+    "y":469.71429443359375
+  },
+  {
+    "type":"pointermove",
+    "timeStamp":216691014.0,
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+    "pointer":10,
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+    "x":229.42857360839844,
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+  {
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+  {
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+    "pointer":12,
+    "x":254.2857208251953,
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+  },
+  {
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+    "timeStamp":216697864.0,
+    "pointer":12,
+    "x":254.2857208251953,
+    "y":497.71429443359375
+  },
+  {
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+    "pointer":13,
+    "x":250.0,
+    "y":306.0
+  },
+  {
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+    "timeStamp":216698328.0,
+    "pointer":13,
+    "x":250.0,
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+  {
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+    "pointer":13,
+    "x":249.14285278320312,
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+  {
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+    "pointer":13,
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+  {
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+  {
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+  {
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+  {
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+    "pointer":13,
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+  {
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+    "pointer":13,
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+  {
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+  {
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+    "pointer":13,
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+  {
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+    "timeStamp":216698421.0,
+    "pointer":13,
+    "x":241.14285278320312,
+    "y":451.4285583496094
+  }
+];

packages/unit/test/gestures/velocity_tracker_test.dart

+import 'package:flutter/gestures.dart';
+import 'package:test/test.dart';
+import 'velocity_tracker_data.dart';
+
+bool _withinTolerance(double actual, double expected) {
+  const double kTolerance = 0.001; // Within .1% of expected value
+  double diff = (actual - expected)/expected;
+  return diff.abs() < kTolerance;
+}
+
+bool _checkVelocity(GestureVelocity actual, GestureVelocity expected) {
+  return (actual.isValid == expected.isValid) &&
+    _withinTolerance(actual.x, expected.x) &&
+    _withinTolerance(actual.y, expected.y);
+}
+
+List<PointerInputEvent> _eventFromMap(List<Map> intermediate) {
+  List<PointerInputEvent> events = new List<PointerInputEvent>();
+  for (Map entry in intermediate)
+    events.add(_eventFor(entry));
+  return events;
+}
+
+PointerInputEvent _eventFor(Map entry) {
+  PointerInputEvent result = new PointerInputEvent(
+    type: entry['type'],
+    timeStamp: entry['timeStamp'],
+    pointer: entry['pointer'],
+    x: entry['x'],
+    y: entry['y']
+  );
+  return result;
+}
+
+void main() {
+  List<PointerInputEvent> events = _eventFromMap(velocityEventData);
+
+  List<GestureVelocity> expected = new List<GestureVelocity>(13);
+  expected[0] = new GestureVelocity(isValid: true, x: 219.5762939453125, y: 1304.6705322265625);
+  expected[1] = new GestureVelocity(isValid: true, x: 355.6900939941406, y: 967.1700439453125);
+  expected[2] = new GestureVelocity(isValid: true, x: 12.651158332824707, y: -36.9227180480957);
+  expected[3] = new GestureVelocity(isValid: true, x: 714.1383056640625, y: -2561.540283203125);
+  expected[4] = new GestureVelocity(isValid: true, x: -19.658065795898438, y: -2910.080322265625);
+  expected[5] = new GestureVelocity(isValid: true, x: 646.8700561523438, y: 2976.982421875);
+  expected[6] = new GestureVelocity(isValid: true, x: 396.6878967285156, y: 2106.204833984375);
+  expected[7] = new GestureVelocity(isValid: true, x: 298.3150634765625, y: -3660.821044921875);
+  expected[8] = new GestureVelocity(isValid: true, x: -1.7460877895355225, y: -3288.16162109375);
+  expected[9] = new GestureVelocity(isValid: true, x: 384.6415710449219, y: -2645.6484375);
+  expected[10] = new GestureVelocity(isValid: true, x: 176.3752899169922, y: 2711.24609375);
+  expected[11] = new GestureVelocity(isValid: true, x: 396.9254455566406, y: 4280.640625);
+  expected[12] = new GestureVelocity(isValid: true, x: -71.51288604736328, y: 3716.74560546875);
+
+  test('Velocity tracker gives expected results', () {
+    VelocityTracker tracker = new VelocityTracker();
+    int i = 0;
+    for (PointerInputEvent event in events) {
+      if (event.type == 'pointerdown' || event.type == 'pointermove')
+        tracker.addPosition(event.timeStamp, event.x, event.y);
+      if (event.type == 'pointerup') {
+        _checkVelocity(tracker.getVelocity(), expected[i++]);
+      }
+    }
+  });
+}