charts
Bucketing Axis Scatter Plot Chart Example
Example:
/// Example of a scatter plot chart with a bucketing measure axis and a legend.
///
/// A bucketing measure axis positions all values beneath a certain threshold
/// into a reserved space on the axis range. The label for the bucket line will
/// be drawn in the middle of the bucket range, rather than aligned with the
/// gridline for that value's position on the scale.
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
class BucketingAxisScatterPlotChart extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
BucketingAxisScatterPlotChart(this.seriesList, {this.animate});
/// Creates a [ScatterPlotChart] with sample data and no transition.
factory BucketingAxisScatterPlotChart.withSampleData() {
return new BucketingAxisScatterPlotChart(
_createSampleData(),
// Disable animations for image tests.
animate: false,
);
}
@override
Widget build(BuildContext context) {
return new charts.ScatterPlotChart(seriesList,
// Set up a bucketing axis that will place all values below 0.1 (10%)
// into a bucket at the bottom of the chart.
//
// Configure a tick count of 3 so that we get 100%, 50%, and the
// threshold.
primaryMeasureAxis: new charts.BucketingAxisSpec(
threshold: 0.1,
tickProviderSpec: new charts.BucketingNumericTickProviderSpec(
desiredTickCount: 3)),
// Add a series legend to display the series names.
behaviors: [
new charts.SeriesLegend(position: charts.BehaviorPosition.end),
],
animate: animate);
}
/// Create one series with sample hard coded data.
static List<charts.Series<LinearSales, int>> _createSampleData() {
final myFakeDesktopData = [
new LinearSales(52, 0.75, 14.0),
];
final myFakeTabletData = [
new LinearSales(45, 0.3, 18.0),
];
final myFakeMobileData = [
new LinearSales(56, 0.8, 17.0),
];
final myFakeChromebookData = [
new LinearSales(25, 0.6, 13.0),
];
final myFakeHomeData = [
new LinearSales(34, 0.5, 15.0),
];
final myFakeOtherData = [
new LinearSales(10, 0.25, 15.0),
new LinearSales(12, 0.075, 14.0),
new LinearSales(13, 0.225, 15.0),
new LinearSales(16, 0.03, 14.0),
new LinearSales(24, 0.04, 13.0),
new LinearSales(37, 0.1, 14.5),
];
return [
new charts.Series<LinearSales, int>(
id: 'Desktop',
colorFn: (LinearSales sales, _) =>
charts.MaterialPalette.blue.shadeDefault,
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.revenueShare,
radiusPxFn: (LinearSales sales, _) => sales.radius,
data: myFakeDesktopData),
new charts.Series<LinearSales, int>(
id: 'Tablet',
colorFn: (LinearSales sales, _) =>
charts.MaterialPalette.red.shadeDefault,
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.revenueShare,
radiusPxFn: (LinearSales sales, _) => sales.radius,
data: myFakeTabletData),
new charts.Series<LinearSales, int>(
id: 'Mobile',
colorFn: (LinearSales sales, _) =>
charts.MaterialPalette.green.shadeDefault,
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.revenueShare,
radiusPxFn: (LinearSales sales, _) => sales.radius,
data: myFakeMobileData),
new charts.Series<LinearSales, int>(
id: 'Chromebook',
colorFn: (LinearSales sales, _) =>
charts.MaterialPalette.purple.shadeDefault,
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.revenueShare,
radiusPxFn: (LinearSales sales, _) => sales.radius,
data: myFakeChromebookData),
new charts.Series<LinearSales, int>(
id: 'Home',
colorFn: (LinearSales sales, _) =>
charts.MaterialPalette.indigo.shadeDefault,
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.revenueShare,
radiusPxFn: (LinearSales sales, _) => sales.radius,
data: myFakeHomeData),
new charts.Series<LinearSales, int>(
id: 'Other',
colorFn: (LinearSales sales, _) =>
charts.MaterialPalette.gray.shadeDefault,
domainFn: (LinearSales sales, _) => sales.year,
measureFn: (LinearSales sales, _) => sales.revenueShare,
radiusPxFn: (LinearSales sales, _) => sales.radius,
data: myFakeOtherData),
];
}
}
/// Sample linear data type.
class LinearSales {
final int year;
final double revenueShare;
final double radius;
LinearSales(this.year, this.revenueShare, this.radius);
}