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// Copyright 2014 The Flutter 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_test/flutter_test.dart';
import 'package:flutter/animation.dart';
import 'package:flutter/widgets.dart';
import 'package:vector_math/vector_math_64.dart';
void main() {
test('Can chain tweens', () {
final Tween<double> tween = Tween<double>(begin: 0.30, end: 0.50);
expect(tween, hasOneLineDescription);
final Animatable<double> chain = tween.chain(Tween<double>(begin: 0.50, end: 1.0));
final AnimationController controller = AnimationController(
vsync: const TestVSync(),
);
expect(chain.evaluate(controller), 0.40);
expect(chain, hasOneLineDescription);
});
test('Can animate tweens', () {
final Tween<double> tween = Tween<double>(begin: 0.30, end: 0.50);
final AnimationController controller = AnimationController(
vsync: const TestVSync(),
);
final Animation<double> animation = tween.animate(controller);
controller.value = 0.50;
expect(animation.value, 0.40);
expect(animation, hasOneLineDescription);
expect(animation.toStringDetails(), hasOneLineDescription);
});
test('Can drive tweens', () {
final Tween<double> tween = Tween<double>(begin: 0.30, end: 0.50);
final AnimationController controller = AnimationController(
vsync: const TestVSync(),
);
final Animation<double> animation = controller.drive(tween);
controller.value = 0.50;
expect(animation.value, 0.40);
expect(animation, hasOneLineDescription);
expect(animation.toStringDetails(), hasOneLineDescription);
});
test('SizeTween', () {
final SizeTween tween = SizeTween(begin: Size.zero, end: const Size(20.0, 30.0));
expect(tween.lerp(0.5), equals(const Size(10.0, 15.0)));
expect(tween, hasOneLineDescription);
});
test('IntTween', () {
final IntTween tween = IntTween(begin: 5, end: 9);
expect(tween.lerp(0.5), 7);
expect(tween.lerp(0.7), 8);
});
test('RectTween', () {
const Rect a = Rect.fromLTWH(5.0, 3.0, 7.0, 11.0);
const Rect b = Rect.fromLTWH(8.0, 12.0, 14.0, 18.0);
final RectTween tween = RectTween(begin: a, end: b);
expect(tween.lerp(0.5), equals(Rect.lerp(a, b, 0.5)));
expect(tween, hasOneLineDescription);
});
test('Matrix4Tween', () {
final Matrix4 a = Matrix4.identity();
final Matrix4 b = a.clone()..translate(6.0, -8.0, 0.0)..scale(0.5, 1.0, 5.0);
final Matrix4Tween tween = Matrix4Tween(begin: a, end: b);
expect(tween.lerp(0.0), equals(a));
expect(tween.lerp(1.0), equals(b));
expect(
tween.lerp(0.5),
equals(a.clone()..translate(3.0, -4.0, 0.0)..scale(0.75, 1.0, 3.0)),
);
final Matrix4 c = a.clone()..rotateZ(1.0);
final Matrix4Tween rotationTween = Matrix4Tween(begin: a, end: c);
expect(rotationTween.lerp(0.0), equals(a));
expect(rotationTween.lerp(1.0), equals(c));
expect(
rotationTween.lerp(0.5).absoluteError(
a.clone()..rotateZ(0.5)
),
moreOrLessEquals(0.0),
);
}, skip: isWindows); // floating point math not quite deterministic on Windows?
test('ConstantTween', () {
final ConstantTween<double> tween = ConstantTween<double>(100.0);
expect(tween.begin, 100.0);
expect(tween.end, 100.0);
expect(tween.lerp(0.0), 100.0);
expect(tween.lerp(0.5), 100.0);
expect(tween.lerp(1.0), 100.0);
});
}