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samples/web/charts/lib/scatter_plot_chart/comparison_points.dart

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// Copyright 2018 the Charts project authors. Please see the AUTHORS file
// for details.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/// Line chart example
// EXCLUDE_FROM_GALLERY_DOCS_START
import 'dart:math';
// EXCLUDE_FROM_GALLERY_DOCS_END
import 'package:charts_flutter/flutter.dart' as charts;
import 'package:flutter/material.dart';
class ComparisonPointsScatterPlotChart extends StatelessWidget {
final List<charts.Series> seriesList;
final bool animate;
const ComparisonPointsScatterPlotChart(this.seriesList,
{this.animate, Key key})
: super(key: key);
/// Creates a [ScatterPlotChart] with sample data and no transition.
factory ComparisonPointsScatterPlotChart.withSampleData() {
return ComparisonPointsScatterPlotChart(
_createSampleData(),
// Disable animations for image tests.
animate: false,
);
}
// EXCLUDE_FROM_GALLERY_DOCS_START
// This section is excluded from being copied to the gallery.
// It is used for creating random series data to demonstrate animation in
// the example app only.
factory ComparisonPointsScatterPlotChart.withRandomData() {
return ComparisonPointsScatterPlotChart(_createRandomData());
}
/// Create random data.
static List<charts.Series<LinearSales, num>> _createRandomData() {
final random = Random();
const maxMeasure = 100;
final data = [
_makeRandomDatum(maxMeasure, random),
_makeRandomDatum(maxMeasure, random),
_makeRandomDatum(maxMeasure, random),
_makeRandomDatum(maxMeasure, random),
_makeRandomDatum(maxMeasure, random),
_makeRandomDatum(maxMeasure, random),
];
return [
charts.Series<LinearSales, int>(
id: 'Sales',
colorFn: (LinearSales sales, _) {
// Color bucket the measure column value into 3 distinct colors.
final bucket = sales.sales / maxMeasure;
if (bucket < 1 / 3) {
return charts.MaterialPalette.blue.shadeDefault;
} else if (bucket < 2 / 3) {
return charts.MaterialPalette.red.shadeDefault;
} else {
return charts.MaterialPalette.green.shadeDefault;
}
},
domainFn: (LinearSales sales, _) => sales.year,
domainLowerBoundFn: (LinearSales sales, _) => sales.yearLower,
domainUpperBoundFn: (LinearSales sales, _) => sales.yearUpper,
measureFn: (LinearSales sales, _) => sales.sales,
measureLowerBoundFn: (LinearSales sales, _) => sales.salesLower,
measureUpperBoundFn: (LinearSales sales, _) => sales.salesUpper,
radiusPxFn: (LinearSales sales, _) => sales.radius,
data: data,
)
];
}
static LinearSales _makeRandomDatum(int max, Random random) {
makeRadius(int value) => (random.nextInt(value) + 6).toDouble();
final year = random.nextInt(max);
final yearLower = (year * 0.8).round();
final yearUpper = year;
final sales = random.nextInt(max);
final salesLower = (sales * 0.8).round();
final salesUpper = sales;
return LinearSales(year, yearLower, yearUpper, sales, salesLower,
salesUpper, makeRadius(4));
}
// EXCLUDE_FROM_GALLERY_DOCS_END
@override
Widget build(BuildContext context) {
return charts.ScatterPlotChart(seriesList,
animate: animate,
defaultRenderer: charts.PointRendererConfig(pointRendererDecorators: [
charts.ComparisonPointsDecorator(
symbolRenderer: charts.CylinderSymbolRenderer())
]));
}
/// Create one series with sample hard coded data.
static List<charts.Series<LinearSales, int>> _createSampleData() {
final data = [
LinearSales(10, 7, 10, 25, 20, 25, 5.0),
LinearSales(13, 11, 13, 225, 205, 225, 5.0),
LinearSales(34, 34, 24, 150, 150, 130, 5.0),
LinearSales(37, 37, 57, 10, 10, 12, 6.5),
LinearSales(45, 35, 45, 260, 300, 260, 8.0),
LinearSales(56, 46, 56, 200, 170, 200, 7.0),
];
const maxMeasure = 300;
return [
charts.Series<LinearSales, int>(
id: 'Sales',
// Providing a color function is optional.
colorFn: (LinearSales sales, _) {
// Bucket the measure column value into 3 distinct colors.
final bucket = sales.sales / maxMeasure;
if (bucket < 1 / 3) {
return charts.MaterialPalette.blue.shadeDefault;
} else if (bucket < 2 / 3) {
return charts.MaterialPalette.red.shadeDefault;
} else {
return charts.MaterialPalette.green.shadeDefault;
}
},
domainFn: (LinearSales sales, _) => sales.year,
domainLowerBoundFn: (LinearSales sales, _) => sales.yearLower,
domainUpperBoundFn: (LinearSales sales, _) => sales.yearUpper,
measureFn: (LinearSales sales, _) => sales.sales,
measureLowerBoundFn: (LinearSales sales, _) => sales.salesLower,
measureUpperBoundFn: (LinearSales sales, _) => sales.salesUpper,
// Providing a radius function is optional.
radiusPxFn: (LinearSales sales, _) => sales.radius,
data: data,
)
];
}
}
/// Sample linear data type.
class LinearSales {
final int year;
final int yearLower;
final int yearUpper;
final int sales;
final int salesLower;
final int salesUpper;
final double radius;
LinearSales(this.year, this.yearLower, this.yearUpper, this.sales,
this.salesLower, this.salesUpper, this.radius);
}