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Add CatmullRomCurve and CatmullRomSpline (#47547)
This adds CatmullRomCurve animation curve, and a CatmullRomSpline, which is what it uses to do interpolation. This allows us to create animation curves which can smoothly interpolate the values given to the curve. Since I've introduced a 2D spline curve, I also created a Curve2D base class for such parametric curves.
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dev/benchmarks/microbenchmarks/lib/geometry/curves_bench.dart
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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. | ||
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import 'dart:ui'; | ||
import 'package:flutter/animation.dart'; | ||
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import '../common.dart'; | ||
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const int _kNumIters = 10000; | ||
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void _testCurve(Curve curve, {String name, String description, BenchmarkResultPrinter printer}) { | ||
final Stopwatch watch = Stopwatch(); | ||
print('$description benchmark...'); | ||
watch.start(); | ||
for (int i = 0; i < _kNumIters; i += 1) { | ||
final double t = i / _kNumIters.toDouble(); | ||
curve.transform(t); | ||
} | ||
watch.stop(); | ||
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printer.addResult( | ||
description: description, | ||
value: watch.elapsedMicroseconds / _kNumIters, | ||
unit: 'µs per iteration', | ||
name: name, | ||
); | ||
} | ||
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void main() { | ||
assert(false, "Don't run benchmarks in checked mode! Use 'flutter run --release'."); | ||
final BenchmarkResultPrinter printer = BenchmarkResultPrinter(); | ||
_testCurve( | ||
const Cubic(0.0, 0.25, 0.5, 1.0), | ||
name: 'cubic_animation_transform_iteration', | ||
description: 'Cubic animation transform', | ||
printer: printer, | ||
); | ||
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final CatmullRomCurve catmullRomCurve = CatmullRomCurve(const <Offset>[ | ||
Offset(0.09, 0.99), | ||
Offset(0.21, 0.01), | ||
Offset(0.28, 0.99), | ||
Offset(0.38, -0.00), | ||
Offset(0.43, 0.99), | ||
Offset(0.54, -0.01), | ||
Offset(0.59, 0.98), | ||
Offset(0.70, 0.04), | ||
Offset(0.78, 0.98), | ||
Offset(0.88, -0.00), | ||
], tension: 0.00); | ||
_testCurve( | ||
catmullRomCurve, | ||
name: 'catmullrom_transform_iteration', | ||
description: 'CatmullRomCurve animation transform', | ||
printer: printer, | ||
); | ||
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printer.printToStdout(); | ||
} |
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