smoothie 0.0.3 smoothie: ^0.0.3 copied to clipboard
Create and sample a cmooth bezier curve going through a given set of points
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(title: 'Smoothie Demo'),
);
}
}
class SmoothieHomePage extends StatefulWidget {
SmoothieHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_SmoothieHomePageState createState() => _SmoothieHomePageState();
}
class _SmoothieHomePageState extends State<SmoothieHomePage> {
int _samplesPerPoint = 0;
var originalDataSeries = <Point>[
Point(0, 5),
Point(3, 15),
Point(5, 10),
Point(6, 6),
Point(9, 13),
];
@override
void initState() {
super.initState();
_samplesPerPoint = 10;
}
void _incrementCounter() {
setState(() {
_samplesPerPoint++;
});
}
void _decrementCounter() {
setState(() {
if (_samplesPerPoint > 1) _samplesPerPoint--;
});
}
@override
Widget build(BuildContext context) {
var series = [
new charts.Series(
domainFn: (Point chartData, _) => chartData.x / _samplesPerPoint,
measureFn: (Point chartData, _) => chartData.y,
colorFn: (Point point, _) => charts.MaterialPalette.teal.shadeDefault,
id: 'Example Series',
data: Smoothie().getSampledCurve(_samplesPerPoint, originalDataSeries),
),
];
var chart = new charts.LineChart(
series,
animate: false,
defaultRenderer: new charts.LineRendererConfig(
includeArea: true,
),
);
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'The curve now has $_samplesPerPoint sampling points per original point.',
),
Container(
height: 200,
child: chart,
),
],
),
),
floatingActionButton: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
FloatingActionButton(
onPressed: _decrementCounter,
tooltip: 'Decrement',
child: Icon(Icons.remove),
),
FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
],
));
}
}