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8b132015bb
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.
61 lines
1.6 KiB
Dart
61 lines
1.6 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:ui';
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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}) {
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final Stopwatch watch = Stopwatch();
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print('$description benchmark...');
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watch.start();
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for (int i = 0; i < _kNumIters; i += 1) {
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final double t = i / _kNumIters.toDouble();
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curve.transform(t);
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}
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watch.stop();
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printer.addResult(
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description: description,
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value: watch.elapsedMicroseconds / _kNumIters,
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unit: 'µs per iteration',
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name: name,
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);
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}
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void main() {
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assert(false, "Don't run benchmarks in checked mode! Use 'flutter run --release'.");
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final BenchmarkResultPrinter printer = BenchmarkResultPrinter();
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_testCurve(
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const Cubic(0.0, 0.25, 0.5, 1.0),
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name: 'cubic_animation_transform_iteration',
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description: 'Cubic animation transform',
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printer: printer,
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);
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final CatmullRomCurve catmullRomCurve = CatmullRomCurve(const <Offset>[
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Offset(0.09, 0.99),
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Offset(0.21, 0.01),
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Offset(0.28, 0.99),
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Offset(0.38, -0.00),
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Offset(0.43, 0.99),
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Offset(0.54, -0.01),
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Offset(0.59, 0.98),
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Offset(0.70, 0.04),
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Offset(0.78, 0.98),
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Offset(0.88, -0.00),
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], tension: 0.00);
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_testCurve(
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catmullRomCurve,
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name: 'catmullrom_transform_iteration',
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description: 'CatmullRomCurve animation transform',
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printer: printer,
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);
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printer.printToStdout();
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}
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