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https://github.com/kreitai/smoothie
Turn data points into a smooth Bézier curve in Dart
https://github.com/kreitai/smoothie
bezier bezier-curves dart fintech-utility flutter smoothing smoothing-lines smoothing-splines
Last synced: 30 days ago
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Turn data points into a smooth Bézier curve in Dart
- Host: GitHub
- URL: https://github.com/kreitai/smoothie
- Owner: kreitai
- License: mit
- Created: 2020-03-28T10:09:34.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2022-10-07T05:12:40.000Z (about 2 years ago)
- Last Synced: 2024-10-01T16:39:47.027Z (about 1 month ago)
- Topics: bezier, bezier-curves, dart, fintech-utility, flutter, smoothing, smoothing-lines, smoothing-splines
- Language: Dart
- Homepage:
- Size: 603 KB
- Stars: 3
- Watchers: 2
- Forks: 3
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
[](https://pub.dartlang.org/packages/smoothie)
# smoothie
Create and sample a smooth Bézier curve going through a given set of points
## Usage
Let's say you have some arbitrary data (a list of points):
```dart
var _originalDataSeries = [
Point(0, 5),
Point(3, 15),
Point(5, 10),
Point(6, 6),
Point(9, 13),
];
```
Define a desired number of samples in the resulting curve:
```dart
int _sampleCount = 100;
```
Import `smoothie`:
```
import 'package:smoothie/smoothie.dart';
```
Create a smooth curve using the `getSampledCurveFromPoints` extension function on your original data:
```dart
List> _sampledCurve = _originalDataSeries.smooth(_sampleCount);
```
See oversampling in action:
Full example using the `charts_flutter` package:
```dart
import 'dart:math';
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
import 'package:smoothie/smoothie.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Smoothie Demo',
theme: ThemeData(
primarySwatch: Colors.teal,
),
home: SmoothieHomePage(),
);
}
}
class SmoothieHomePage extends StatefulWidget {
SmoothieHomePage({Key? key}) : super(key: key);
@override
_SmoothieHomePageState createState() => _SmoothieHomePageState();
}
class _SmoothieHomePageState extends State {
int _samplingPointCount = 0;
var _originalDataSeries = [
Point(0, 5),
Point(2, 15),
Point(3, 10),
Point(8, 6),
Point(9, 13),
];
@override
void initState() {
super.initState();
_samplingPointCount = _originalDataSeries.length;
}
void _incrementCounter() {
setState(() {
_samplingPointCount++;
});
}
void _decrementCounter() {
setState(() {
if (_samplingPointCount > _originalDataSeries.length)
_samplingPointCount--;
});
}
@override
Widget build(BuildContext context) {
var series = [
new charts.Series(
domainFn: (Point chartData, _) => chartData.x,
measureFn: (Point chartData, _) => chartData.y,
colorFn: (Point point, _) => charts.MaterialPalette.teal.shadeDefault,
id: 'Example Series',
data: _originalDataSeries.smooth(
_samplingPointCount,
),
),
];
var chart = new charts.LineChart(
series,
animate: false,
defaultRenderer: new charts.LineRendererConfig(
includeArea: true,
),
);
return Scaffold(
appBar: AppBar(
title: Text("Smoothie Demo"),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
'The smooth curve now has $_samplingPointCount points.',
),
Container(
height: 200,
child: chart,
),
],
),
),
floatingActionButton: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
FloatingActionButton(
onPressed: _decrementCounter,
tooltip: 'Decrement',
child: Icon(Icons.remove),
),
FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
],
));
}
}
```
If you want to run the example as is and you are using null safety, you have to pass `--no-sound-null-safety` to the build command as the current version of `charts_flutter` does not yet support null safety:
```console
cd example
flutter run --no-sound-null-safety
```