// 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); }); test('ReverseTween', () { final ReverseTween<int> tween = ReverseTween<int>(IntTween(begin: 5, end: 9)); expect(tween.lerp(0.5), 7); expect(tween.lerp(0.7), 6); }); test('ColorTween', () { final ColorTween tween = ColorTween( begin: const Color(0xff000000), end: const Color(0xffffffff) ); expect(tween.lerp(0.0), const Color(0xff000000)); expect(tween.lerp(0.5), const Color(0xff7f7f7f)); expect(tween.lerp(0.7), const Color(0xffb2b2b2)); expect(tween.lerp(1.0), const Color(0xffffffff)); }); test('StepTween', () { final StepTween tween = StepTween(begin: 5, end: 9); expect(tween.lerp(0.5), 7); expect(tween.lerp(0.7), 7); }); test('CurveTween', () { final CurveTween tween = CurveTween(curve: Curves.easeIn); expect(tween.transform(0.0), 0.0); expect(tween.transform(0.5), 0.31640625); expect(tween.transform(1.0), 1.0); }); }