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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 'dart:math' as math;
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
test('toString control test', () {
expect(Curves.linear, hasOneLineDescription);
expect(const SawTooth(3), hasOneLineDescription);
expect(const Interval(0.25, 0.75), hasOneLineDescription);
expect(const Interval(0.25, 0.75, curve: Curves.ease), hasOneLineDescription);
});
test('Curve flipped control test', () {
const Curve ease = Curves.ease;
final Curve flippedEase = ease.flipped;
expect(flippedEase.transform(0.0), lessThan(0.001));
expect(flippedEase.transform(0.5), lessThan(ease.transform(0.5)));
expect(flippedEase.transform(1.0), greaterThan(0.999));
expect(flippedEase, hasOneLineDescription);
});
test('Threshold has a threshold', () {
const Curve step = Threshold(0.25);
expect(step.transform(0.0), 0.0);
expect(step.transform(0.24), 0.0);
expect(step.transform(0.25), 1.0);
expect(step.transform(0.26), 1.0);
expect(step.transform(1.0), 1.0);
});
void assertMaximumSlope(Curve curve, double maximumSlope) {
const double delta = 0.005;
for (double x = 0.0; x < 1.0 - delta; x += delta) {
final double deltaY = curve.transform(x) - curve.transform(x + delta);
assert(deltaY.abs() < delta * maximumSlope, '$curve discontinuous at $x');
}
}
test('Curve is continuous', () {
assertMaximumSlope(Curves.linear, 20.0);
assertMaximumSlope(Curves.decelerate, 20.0);
assertMaximumSlope(Curves.fastOutSlowIn, 20.0);
assertMaximumSlope(Curves.slowMiddle, 20.0);
assertMaximumSlope(Curves.bounceIn, 20.0);
assertMaximumSlope(Curves.bounceOut, 20.0);
assertMaximumSlope(Curves.bounceInOut, 20.0);
assertMaximumSlope(Curves.elasticOut, 20.0);
assertMaximumSlope(Curves.elasticInOut, 20.0);
assertMaximumSlope(Curves.ease, 20.0);
assertMaximumSlope(Curves.easeIn, 20.0);
assertMaximumSlope(Curves.easeInSine, 20.0);
assertMaximumSlope(Curves.easeInQuad, 20.0);
assertMaximumSlope(Curves.easeInCubic, 20.0);
assertMaximumSlope(Curves.easeInQuart, 20.0);
assertMaximumSlope(Curves.easeInQuint, 20.0);
assertMaximumSlope(Curves.easeInExpo, 20.0);
assertMaximumSlope(Curves.easeInCirc, 20.0);
assertMaximumSlope(Curves.easeOut, 20.0);
assertMaximumSlope(Curves.easeOutSine, 20.0);
assertMaximumSlope(Curves.easeOutQuad, 20.0);
assertMaximumSlope(Curves.easeOutCubic, 20.0);
assertMaximumSlope(Curves.easeInOutCubicEmphasized, 20.0);
assertMaximumSlope(Curves.easeOutQuart, 20.0);
assertMaximumSlope(Curves.easeOutQuint, 20.0);
assertMaximumSlope(Curves.easeOutExpo, 20.0);
assertMaximumSlope(Curves.easeOutCirc, 20.0);
// Curves.easeInOutExpo is discontinuous at its midpoint, so not included
// here
assertMaximumSlope(Curves.easeInOut, 20.0);
assertMaximumSlope(Curves.easeInOutSine, 20.0);
assertMaximumSlope(Curves.easeInOutQuad, 20.0);
assertMaximumSlope(Curves.easeInOutCubic, 20.0);
assertMaximumSlope(Curves.easeInOutQuart, 20.0);
assertMaximumSlope(Curves.easeInOutQuint, 20.0);
assertMaximumSlope(Curves.easeInOutCirc, 20.0);
});
void expectStaysInBounds(Curve curve) {
expect(curve.transform(0.0), inInclusiveRange(0.0, 1.0));
expect(curve.transform(0.1), inInclusiveRange(0.0, 1.0));
expect(curve.transform(0.2), inInclusiveRange(0.0, 1.0));
expect(curve.transform(0.3), inInclusiveRange(0.0, 1.0));
expect(curve.transform(0.4), inInclusiveRange(0.0, 1.0));
expect(curve.transform(0.5), inInclusiveRange(0.0, 1.0));
expect(curve.transform(0.6), inInclusiveRange(0.0, 1.0));
expect(curve.transform(0.7), inInclusiveRange(0.0, 1.0));
expect(curve.transform(0.8), inInclusiveRange(0.0, 1.0));
expect(curve.transform(0.9), inInclusiveRange(0.0, 1.0));
expect(curve.transform(1.0), inInclusiveRange(0.0, 1.0));
}
test('Bounce stays in bounds', () {
expectStaysInBounds(Curves.bounceIn);
expectStaysInBounds(Curves.bounceOut);
expectStaysInBounds(Curves.bounceInOut);
});
List<double> estimateBounds(Curve curve) {
final List<double> values = <double>[
curve.transform(0.0),
curve.transform(0.1),
curve.transform(0.2),
curve.transform(0.3),
curve.transform(0.4),
curve.transform(0.5),
curve.transform(0.6),
curve.transform(0.7),
curve.transform(0.8),
curve.transform(0.9),
curve.transform(1.0),
];
return <double>[
values.reduce(math.min),
values.reduce(math.max),
];
}
test('Elastic overshoots its bounds', () {
expect(Curves.elasticIn, hasOneLineDescription);
expect(Curves.elasticOut, hasOneLineDescription);
expect(Curves.elasticInOut, hasOneLineDescription);
List<double> bounds;
bounds = estimateBounds(Curves.elasticIn);
expect(bounds[0], lessThan(0.0));
expect(bounds[1], lessThanOrEqualTo(1.0));
bounds = estimateBounds(Curves.elasticOut);
expect(bounds[0], greaterThanOrEqualTo(0.0));
expect(bounds[1], greaterThan(1.0));
bounds = estimateBounds(Curves.elasticInOut);
expect(bounds[0], lessThan(0.0));
expect(bounds[1], greaterThan(1.0));
});
test('Back overshoots its bounds', () {
expect(Curves.easeInBack, hasOneLineDescription);
expect(Curves.easeOutBack, hasOneLineDescription);
expect(Curves.easeInOutBack, hasOneLineDescription);
List<double> bounds;
bounds = estimateBounds(Curves.easeInBack);
expect(bounds[0], lessThan(0.0));
expect(bounds[1], lessThanOrEqualTo(1.0));
bounds = estimateBounds(Curves.easeOutBack);
expect(bounds[0], greaterThanOrEqualTo(0.0));
expect(bounds[1], greaterThan(1.0));
bounds = estimateBounds(Curves.easeInOutBack);
expect(bounds[0], lessThan(0.0));
expect(bounds[1], greaterThan(1.0));
});
test('Decelerate does so', () {
expect(Curves.decelerate, hasOneLineDescription);
final List<double> bounds = estimateBounds(Curves.decelerate);
expect(bounds[0], greaterThanOrEqualTo(0.0));
expect(bounds[1], lessThanOrEqualTo(1.0));
final double d1 = Curves.decelerate.transform(0.2) - Curves.decelerate.transform(0.0);
final double d2 = Curves.decelerate.transform(1.0) - Curves.decelerate.transform(0.8);
expect(d2, lessThan(d1));
});
test('ThreePointCubic interpolates midpoint', () {
const ThreePointCubic test = ThreePointCubic(
Offset(0.05, 0), Offset(0.133333, 0.06),
Offset(0.166666, 0.4),
Offset(0.208333, 0.82), Offset(0.25, 1),
);
expect(test.transform(0.166666), equals(0.4));
});
test('Invalid transform parameter should assert', () {
expect(() => const SawTooth(2).transform(-0.0001), throwsAssertionError);
expect(() => const SawTooth(2).transform(1.0001), throwsAssertionError);
expect(() => const Interval(0.0, 1.0).transform(-0.0001), throwsAssertionError);
expect(() => const Interval(0.0, 1.0).transform(1.0001), throwsAssertionError);
expect(() => const Threshold(0.5).transform(-0.0001), throwsAssertionError);
expect(() => const Threshold(0.5).transform(1.0001), throwsAssertionError);
expect(() => const ElasticInCurve().transform(-0.0001), throwsAssertionError);
expect(() => const ElasticInCurve().transform(1.0001), throwsAssertionError);
expect(() => const ElasticOutCurve().transform(-0.0001), throwsAssertionError);
expect(() => const ElasticOutCurve().transform(1.0001), throwsAssertionError);
expect(() => const Cubic(0.42, 0.0, 0.58, 1.0).transform(-0.0001), throwsAssertionError);
expect(() => const Cubic(0.42, 0.0, 0.58, 1.0).transform(1.0001), throwsAssertionError);
expect(() => Curves.easeInOutCubicEmphasized.transform(-0.0001), throwsAssertionError);
expect(() => Curves.easeInOutCubicEmphasized.transform(1.0001), throwsAssertionError);
expect(() => Curves.decelerate.transform(-0.0001), throwsAssertionError);
expect(() => Curves.decelerate.transform(1.0001), throwsAssertionError);
expect(() => Curves.bounceIn.transform(-0.0001), throwsAssertionError);
expect(() => Curves.bounceIn.transform(1.0001), throwsAssertionError);
expect(() => Curves.bounceOut.transform(-0.0001), throwsAssertionError);
expect(() => Curves.bounceOut.transform(1.0001), throwsAssertionError);
expect(() => Curves.bounceInOut.transform(-0.0001), throwsAssertionError);
expect(() => Curves.bounceInOut.transform(1.0001), throwsAssertionError);
});
test('Curve transform method should return 0.0 for t=0.0 and 1.0 for t=1.0', () {
expect(const SawTooth(2).transform(0), 0);
expect(const SawTooth(2).transform(1), 1);
expect(const Interval(0, 1).transform(0), 0);
expect(const Interval(0, 1).transform(1), 1);
expect(const Threshold(0.5).transform(0), 0);
expect(const Threshold(0.5).transform(1), 1);
expect(const ElasticInCurve().transform(0), 0);
expect(const ElasticInCurve().transform(1), 1);
expect(const ElasticOutCurve().transform(0), 0);
expect(const ElasticOutCurve().transform(1), 1);
expect(const ElasticInOutCurve().transform(0), 0);
expect(const ElasticInOutCurve().transform(1), 1);
expect(Curves.linear.transform(0), 0);
expect(Curves.linear.transform(1), 1);
expect(Curves.easeInOutExpo.transform(0), 0);
expect(Curves.easeInOutExpo.transform(1), 1);
expect(Curves.easeInOutCubicEmphasized.transform(0), 0);
expect(Curves.easeInOutCubicEmphasized.transform(1), 1);
expect(const FlippedCurve(Curves.easeInOutExpo).transform(0), 0);
expect(const FlippedCurve(Curves.easeInOutExpo).transform(1), 1);
expect(Curves.decelerate.transform(0), 0);
expect(Curves.decelerate.transform(1), 1);
expect(Curves.bounceIn.transform(0), 0);
expect(Curves.bounceIn.transform(1), 1);
expect(Curves.bounceOut.transform(0), 0);
expect(Curves.bounceOut.transform(1), 1);
expect(Curves.bounceInOut.transform(0), 0);
expect(Curves.bounceInOut.transform(1), 1);
});
test('CatmullRomSpline interpolates values properly', () {
final CatmullRomSpline curve = CatmullRomSpline(
const <Offset>[
Offset.zero,
Offset(0.01, 0.25),
Offset(0.2, 0.25),
Offset(0.33, 0.25),
Offset(0.5, 1.0),
Offset(0.66, 0.75),
Offset(1.0, 1.0),
],
startHandle: const Offset(0.0, -0.3),
endHandle: const Offset(1.3, 1.3),
);
const double tolerance = 1e-6;
expect(curve.transform(0.0).dx, moreOrLessEquals(0.0, epsilon: tolerance));
expect(curve.transform(0.0).dy, moreOrLessEquals(0.0, epsilon: tolerance));
expect(curve.transform(0.25).dx, moreOrLessEquals(0.0966945, epsilon: tolerance));
expect(curve.transform(0.25).dy, moreOrLessEquals(0.2626806, epsilon: tolerance));
expect(curve.transform(0.5).dx, moreOrLessEquals(0.33, epsilon: tolerance));
expect(curve.transform(0.5).dy, moreOrLessEquals(0.25, epsilon: tolerance));
expect(curve.transform(0.75).dx, moreOrLessEquals(0.570260, epsilon: tolerance));
expect(curve.transform(0.75).dy, moreOrLessEquals(0.883085, epsilon: tolerance));
expect(curve.transform(1.0).dx, moreOrLessEquals(1.0, epsilon: tolerance));
expect(curve.transform(1.0).dy, moreOrLessEquals(1.0, epsilon: tolerance));
});
test('CatmullRomSpline enforces contract', () {
expect(() {
CatmullRomSpline(const <Offset>[]);
}, throwsAssertionError);
expect(() {
CatmullRomSpline(const <Offset>[Offset.zero]);
}, throwsAssertionError);
expect(() {
CatmullRomSpline(const <Offset>[Offset.zero, Offset.zero]);
}, throwsAssertionError);
expect(() {
CatmullRomSpline(const <Offset>[Offset.zero, Offset.zero, Offset.zero]);
}, throwsAssertionError);
expect(() {
CatmullRomSpline(const <Offset>[Offset.zero, Offset.zero, Offset.zero, Offset.zero], tension: -1.0);
}, throwsAssertionError);
expect(() {
CatmullRomSpline(const <Offset>[Offset.zero, Offset.zero, Offset.zero, Offset.zero], tension: 2.0);
}, throwsAssertionError);
expect(() {
CatmullRomSpline(
const <Offset>[Offset(double.infinity, 0.0), Offset.zero, Offset.zero, Offset.zero],
).generateSamples();
}, throwsAssertionError);
expect(() {
CatmullRomSpline(
const <Offset>[Offset(0.0, double.infinity), Offset.zero, Offset.zero, Offset.zero],
).generateSamples();
}, throwsAssertionError);
expect(() {
CatmullRomSpline(
startHandle: const Offset(0.0, double.infinity),
const <Offset>[Offset.zero, Offset.zero, Offset.zero, Offset.zero],
).generateSamples();
}, throwsAssertionError);
expect(() {
CatmullRomSpline(
endHandle: const Offset(0.0, double.infinity),
const <Offset>[Offset.zero, Offset.zero, Offset.zero, Offset.zero],
).generateSamples();
}, throwsAssertionError);
});
test('CatmullRomSpline interpolates values properly when precomputed', () {
final CatmullRomSpline curve = CatmullRomSpline.precompute(
const <Offset>[
Offset.zero,
Offset(0.01, 0.25),
Offset(0.2, 0.25),
Offset(0.33, 0.25),
Offset(0.5, 1.0),
Offset(0.66, 0.75),
Offset(1.0, 1.0),
],
startHandle: const Offset(0.0, -0.3),
endHandle: const Offset(1.3, 1.3),
);
const double tolerance = 1e-6;
expect(curve.transform(0.0).dx, moreOrLessEquals(0.0, epsilon: tolerance));
expect(curve.transform(0.0).dy, moreOrLessEquals(0.0, epsilon: tolerance));
expect(curve.transform(0.25).dx, moreOrLessEquals(0.0966945, epsilon: tolerance));
expect(curve.transform(0.25).dy, moreOrLessEquals(0.2626806, epsilon: tolerance));
expect(curve.transform(0.5).dx, moreOrLessEquals(0.33, epsilon: tolerance));
expect(curve.transform(0.5).dy, moreOrLessEquals(0.25, epsilon: tolerance));
expect(curve.transform(0.75).dx, moreOrLessEquals(0.570260, epsilon: tolerance));
expect(curve.transform(0.75).dy, moreOrLessEquals(0.883085, epsilon: tolerance));
expect(curve.transform(1.0).dx, moreOrLessEquals(1.0, epsilon: tolerance));
expect(curve.transform(1.0).dy, moreOrLessEquals(1.0, epsilon: tolerance));
});
test('CatmullRomSpline enforces contract when precomputed', () {
expect(() {
CatmullRomSpline.precompute(const <Offset>[]);
}, throwsAssertionError);
expect(() {
CatmullRomSpline.precompute(const <Offset>[Offset.zero]);
}, throwsAssertionError);
expect(() {
CatmullRomSpline.precompute(const <Offset>[Offset.zero, Offset.zero]);
}, throwsAssertionError);
expect(() {
CatmullRomSpline.precompute(const <Offset>[Offset.zero, Offset.zero, Offset.zero]);
}, throwsAssertionError);
expect(() {
CatmullRomSpline.precompute(const <Offset>[Offset.zero, Offset.zero, Offset.zero, Offset.zero], tension: -1.0);
}, throwsAssertionError);
expect(() {
CatmullRomSpline.precompute(const <Offset>[Offset.zero, Offset.zero, Offset.zero, Offset.zero], tension: 2.0);
}, throwsAssertionError);
expect(() {
CatmullRomSpline.precompute(const <Offset>[Offset(double.infinity, 0.0), Offset.zero, Offset.zero, Offset.zero]);
}, throwsAssertionError);
expect(() {
CatmullRomSpline.precompute(const <Offset>[Offset(0.0, double.infinity), Offset.zero, Offset.zero, Offset.zero]);
}, throwsAssertionError);
expect(() {
CatmullRomSpline.precompute(
startHandle: const Offset(0.0, double.infinity),
const <Offset>[Offset.zero, Offset.zero, Offset.zero, Offset.zero],
);
}, throwsAssertionError);
expect(() {
CatmullRomSpline.precompute(
endHandle: const Offset(0.0, double.infinity),
const <Offset>[Offset.zero, Offset.zero, Offset.zero, Offset.zero],
);
}, throwsAssertionError);
});
test('CatmullRomCurve interpolates given points correctly', () {
final CatmullRomCurve curve = CatmullRomCurve(
const <Offset>[
Offset(0.2, 0.25),
Offset(0.33, 0.25),
Offset(0.5, 1.0),
Offset(0.8, 0.75),
],
);
// These values are approximations.
const double tolerance = 1e-6;
expect(curve.transform(0.0), moreOrLessEquals(0.0, epsilon: tolerance));
expect(curve.transform(0.01), moreOrLessEquals(0.012874734350170863, epsilon: tolerance));
expect(curve.transform(0.2), moreOrLessEquals(0.24989646045277542, epsilon: tolerance));
expect(curve.transform(0.33), moreOrLessEquals(0.250037698527661, epsilon: tolerance));
expect(curve.transform(0.5), moreOrLessEquals(0.9999057323235939, epsilon: tolerance));
expect(curve.transform(0.6), moreOrLessEquals(0.9357294964536621, epsilon: tolerance));
expect(curve.transform(0.8), moreOrLessEquals(0.7500423402378034, epsilon: tolerance));
expect(curve.transform(1.0), moreOrLessEquals(1.0, epsilon: tolerance));
});
test('CatmullRomCurve interpolates given points correctly when precomputed', () {
final CatmullRomCurve curve = CatmullRomCurve.precompute(
const <Offset>[
Offset(0.2, 0.25),
Offset(0.33, 0.25),
Offset(0.5, 1.0),
Offset(0.8, 0.75),
],
);
// These values are approximations.
const double tolerance = 1e-6;
expect(curve.transform(0.0), moreOrLessEquals(0.0, epsilon: tolerance));
expect(curve.transform(0.01), moreOrLessEquals(0.012874734350170863, epsilon: tolerance));
expect(curve.transform(0.2), moreOrLessEquals(0.24989646045277542, epsilon: tolerance));
expect(curve.transform(0.33), moreOrLessEquals(0.250037698527661, epsilon: tolerance));
expect(curve.transform(0.5), moreOrLessEquals(0.9999057323235939, epsilon: tolerance));
expect(curve.transform(0.6), moreOrLessEquals(0.9357294964536621, epsilon: tolerance));
expect(curve.transform(0.8), moreOrLessEquals(0.7500423402378034, epsilon: tolerance));
expect(curve.transform(1.0), moreOrLessEquals(1.0, epsilon: tolerance));
});
test('CatmullRomCurve enforces contract', () {
expect(() {
CatmullRomCurve(const <Offset>[]);
}, throwsAssertionError);
expect(() {
CatmullRomCurve(const <Offset>[Offset.zero]);
}, throwsAssertionError);
expect(() {
CatmullRomCurve(const <Offset>[Offset.zero, Offset.zero]);
}, throwsAssertionError);
// Monotonically increasing in X.
expect(
CatmullRomCurve.validateControlPoints(
const <Offset>[
Offset(0.2, 0.25),
Offset(0.01, 0.25),
],
),
isFalse,
);
expect(() {
CatmullRomCurve(
const <Offset>[
Offset(0.2, 0.25),
Offset(0.01, 0.25),
],
);
}, throwsAssertionError);
// X within range (0.0, 1.0).
expect(
CatmullRomCurve.validateControlPoints(
const <Offset>[
Offset(0.2, 0.25),
Offset(1.01, 0.25),
],
),
isFalse,
);
expect(() {
CatmullRomCurve(
const <Offset>[
Offset(0.2, 0.25),
Offset(1.01, 0.25),
],
);
}, throwsAssertionError);
// Not multi-valued in Y at x=0.0.
expect(
CatmullRomCurve.validateControlPoints(
const <Offset>[
Offset(0.05, 0.50),
Offset(0.50, 0.50),
Offset(0.75, 0.75),
],
),
isFalse,
);
expect(() {
CatmullRomCurve(
const <Offset>[
Offset(0.05, 0.50),
Offset(0.50, 0.50),
Offset(0.75, 0.75),
],
);
}, throwsAssertionError);
// Not multi-valued in Y at x=1.0.
expect(
CatmullRomCurve.validateControlPoints(
const <Offset>[
Offset(0.25, 0.25),
Offset(0.50, 0.50),
Offset(0.95, 0.51),
],
),
isFalse,
);
expect(() {
CatmullRomCurve(
const <Offset>[
Offset(0.25, 0.25),
Offset(0.50, 0.50),
Offset(0.95, 0.51),
],
);
}, throwsAssertionError);
// Not multi-valued in Y in between x = 0.0 and x = 1.0.
expect(
CatmullRomCurve.validateControlPoints(
const <Offset>[
Offset(0.5, 0.05),
Offset(0.5, 0.95),
],
),
isFalse,
);
expect(() {
CatmullRomCurve(
const <Offset>[
Offset(0.5, 0.05),
Offset(0.5, 0.95),
],
);
}, throwsAssertionError);
});
test('CatmullRomCurve enforces contract when precomputed', () {
expect(() {
CatmullRomCurve.precompute(const <Offset>[]);
}, throwsAssertionError);
expect(() {
CatmullRomCurve.precompute(const <Offset>[Offset.zero]);
}, throwsAssertionError);
expect(() {
CatmullRomCurve.precompute(const <Offset>[Offset.zero, Offset.zero]);
}, throwsAssertionError);
// Monotonically increasing in X.
expect(() {
CatmullRomCurve.precompute(
const <Offset>[
Offset(0.2, 0.25),
Offset(0.01, 0.25),
],
);
}, throwsAssertionError);
// X within range (0.0, 1.0).
expect(() {
CatmullRomCurve.precompute(
const <Offset>[
Offset(0.2, 0.25),
Offset(1.01, 0.25),
],
);
}, throwsAssertionError);
// Not multi-valued in Y at x=0.0.
expect(() {
CatmullRomCurve.precompute(
const <Offset>[
Offset(0.05, 0.50),
Offset(0.50, 0.50),
Offset(0.75, 0.75),
],
);
}, throwsAssertionError);
// Not multi-valued in Y at x=1.0.
expect(() {
CatmullRomCurve.precompute(
const <Offset>[
Offset(0.25, 0.25),
Offset(0.50, 0.50),
Offset(0.95, 0.51),
],
);
}, throwsAssertionError);
// Not multi-valued in Y in between x = 0.0 and x = 1.0.
expect(() {
CatmullRomCurve.precompute(
const <Offset>[
Offset(0.5, 0.05),
Offset(0.5, 0.95),
],
);
}, throwsAssertionError);
});
}