51 lines
1.8 KiB
Dart
51 lines
1.8 KiB
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: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(Offset actual, Offset expected) {
|
|
return (actual != null)
|
|
&& _withinTolerance(actual.dx, expected.dx)
|
|
&& _withinTolerance(actual.dy, expected.dy);
|
|
}
|
|
|
|
void main() {
|
|
List<Offset> expected = const <Offset>[
|
|
const Offset(219.5762939453125, 1304.6705322265625),
|
|
const Offset(355.6900939941406, 967.1700439453125),
|
|
const Offset(12.651158332824707, -36.9227180480957),
|
|
const Offset(714.1383056640625, -2561.540283203125),
|
|
const Offset(-19.658065795898438, -2910.080322265625),
|
|
const Offset(646.8700561523438, 2976.982421875),
|
|
const Offset(396.6878967285156, 2106.204833984375),
|
|
const Offset(298.3150634765625, -3660.821044921875),
|
|
const Offset(-1.7460877895355225, -3288.16162109375),
|
|
const Offset(384.6415710449219, -2645.6484375),
|
|
const Offset(176.3752899169922, 2711.24609375),
|
|
const Offset(396.9254455566406, 4280.640625),
|
|
const Offset(-71.51288604736328, 3716.74560546875),
|
|
];
|
|
|
|
test('Velocity tracker gives expected results', () {
|
|
VelocityTracker tracker = new VelocityTracker();
|
|
int i = 0;
|
|
for (PointerEvent event in velocityEventData) {
|
|
if (event is PointerDownEvent || event is PointerMoveEvent)
|
|
tracker.addPosition(event.timeStamp, event.position);
|
|
if (event is PointerUpEvent) {
|
|
_checkVelocity(tracker.getVelocity(), expected[i]);
|
|
i += 1;
|
|
}
|
|
}
|
|
});
|
|
}
|