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235 lines
9.7 KiB
235 lines
9.7 KiB
// Copyright 2018 the Charts project authors. Please see the AUTHORS file
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// for details.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/// Example of a scatter plot chart using custom symbols for the points and a
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/// behavior that highlights selected points.
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///
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/// An optional [charts.LinePointHighlighter] behavior has been added to enable
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/// a highlighting effect. This behavior will draw a larger symbol on top of the
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/// point nearest to the point where a user taps on the chart. It will also draw
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/// follow lines.
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///
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/// The series has been configured to draw each point as a square by default.
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///
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/// Some data will be drawn as a circle, indicated by defining a custom "circle"
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/// value referenced by [charts.pointSymbolRendererFnKey].
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///
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/// Some other data have will be drawn as a hollow circle. In addition to the
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/// custom renderer key, these data also have stroke and fillColor values
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/// defined. Configuring a separate fillColor will cause the center of the shape
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/// to be filled in, with white in these examples. The border of the shape will
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/// be color with the color of the data.
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// EXCLUDE_FROM_GALLERY_DOCS_START
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import 'dart:math';
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// EXCLUDE_FROM_GALLERY_DOCS_END
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import 'package:charts_flutter/flutter.dart' as charts;
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import 'package:flutter/material.dart';
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class SelectionScatterPlotHighlight extends StatelessWidget {
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final List<charts.Series<dynamic, num>> seriesList;
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final bool? animate;
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const SelectionScatterPlotHighlight(this.seriesList, {this.animate, Key? key})
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: super(key: key);
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/// Creates a [ScatterPlotChart] with sample data and no transition.
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factory SelectionScatterPlotHighlight.withSampleData() {
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return SelectionScatterPlotHighlight(
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_createSampleData(),
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// Disable animations for image tests.
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animate: false,
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);
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}
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// EXCLUDE_FROM_GALLERY_DOCS_START
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// This section is excluded from being copied to the gallery.
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// It is used for creating random series data to demonstrate animation in
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// the example app only.
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factory SelectionScatterPlotHighlight.withRandomData() {
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return SelectionScatterPlotHighlight(_createRandomData());
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}
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/// Create random data.
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static List<charts.Series<LinearSales, num>> _createRandomData() {
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final random = Random();
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makeRadius(int value) => (random.nextInt(value) + 2).toDouble();
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final data = [
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(6),
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'circle', null, null),
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(6), null,
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null, null),
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(6), null,
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null, null),
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// Render a hollow circle, filled in with white.
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(4) + 4,
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'circle', charts.MaterialPalette.white, 2.0),
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(6), null,
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null, null),
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(6), null,
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null, null),
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(6),
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'circle', null, null),
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(6), null,
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null, null),
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(6), null,
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null, null),
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// Render a hollow circle, filled in with white.
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(4) + 4,
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'circle', charts.MaterialPalette.white, 2.0),
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(6), null,
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null, null),
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// Render a hollow square, filled in with white.
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LinearSales(random.nextInt(100), random.nextInt(100), makeRadius(4) + 4,
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null, charts.MaterialPalette.white, 2.0),
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];
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const maxMeasure = 100;
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return [
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charts.Series<LinearSales, int>(
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id: 'Sales',
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colorFn: (LinearSales sales, _) {
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// Color bucket the measure column value into 3 distinct colors.
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final bucket = sales.sales / maxMeasure;
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if (bucket < 1 / 3) {
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return charts.MaterialPalette.blue.shadeDefault;
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} else if (bucket < 2 / 3) {
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return charts.MaterialPalette.red.shadeDefault;
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} else {
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return charts.MaterialPalette.green.shadeDefault;
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}
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},
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domainFn: (LinearSales sales, _) => sales.year,
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measureFn: (LinearSales sales, _) => sales.sales,
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radiusPxFn: (LinearSales sales, _) => sales.radius,
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fillColorFn: (LinearSales row, _) => row.fillColor,
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strokeWidthPxFn: (LinearSales row, _) => row.strokeWidth,
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data: data,
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)
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// Accessor function that associates each datum with a symbol renderer.
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..setAttribute(
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charts.pointSymbolRendererFnKey, (int index) => data[index].shape)
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// Default symbol renderer ID for data that have no defined shape.
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..setAttribute(charts.pointSymbolRendererIdKey, 'rect')
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];
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}
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// EXCLUDE_FROM_GALLERY_DOCS_END
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@override
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Widget build(BuildContext context) {
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return charts.ScatterPlotChart(seriesList,
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animate: animate,
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behaviors: [
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// Optional - Configures a [LinePointHighlighter] behavior with
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// horizontal and vertical follow lines. The highlighter will increase
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// the size of the selected points on the chart.
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//
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// By default, the line has default dash pattern of [1,3]. This can be
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// set by providing a [dashPattern] or it can be turned off by passing
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// in an empty list. An empty list is necessary because passing in a
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// null value will be treated the same as not passing in a value at
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// all.
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charts.LinePointHighlighter(
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showHorizontalFollowLine:
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charts.LinePointHighlighterFollowLineType.nearest,
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showVerticalFollowLine:
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charts.LinePointHighlighterFollowLineType.nearest),
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// Optional - By default, select nearest is configured to trigger
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// with tap so that a user can have pan/zoom behavior and line point
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// highlighter. Changing the trigger to tap and drag allows the
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// highlighter to follow the dragging gesture but it is not
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// recommended to be used when pan/zoom behavior is enabled.
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charts.SelectNearest(
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eventTrigger: charts.SelectionTrigger.tapAndDrag),
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],
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// Configure the point renderer to have a map of custom symbol
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// renderers.
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defaultRenderer:
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charts.PointRendererConfig<num>(customSymbolRenderers: {
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'circle': charts.CircleSymbolRenderer(),
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'rect': charts.RectSymbolRenderer(),
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}));
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}
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/// Create one series with sample hard coded data.
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static List<charts.Series<LinearSales, int>> _createSampleData() {
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final data = [
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LinearSales(0, 5, 3.0, 'circle', null, null),
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LinearSales(10, 25, 5.0, null, null, null),
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LinearSales(12, 75, 4.0, null, null, null),
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// Render a hollow circle, filled in with white.
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LinearSales(13, 225, 5.0, 'circle', charts.MaterialPalette.white, 2.0),
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LinearSales(16, 50, 4.0, null, null, null),
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LinearSales(24, 75, 3.0, null, null, null),
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LinearSales(25, 100, 3.0, 'circle', null, null),
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LinearSales(34, 150, 5.0, null, null, null),
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LinearSales(37, 10, 4.5, null, null, null),
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// Render a hollow circle, filled in with white.
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LinearSales(45, 300, 8.0, 'circle', charts.MaterialPalette.white, 2.0),
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LinearSales(52, 15, 4.0, null, null, null),
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// Render a hollow square, filled in with white.
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LinearSales(56, 200, 7.0, null, charts.MaterialPalette.white, 2.0),
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];
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const maxMeasure = 300;
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return [
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charts.Series<LinearSales, int>(
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id: 'Sales',
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// Providing a color function is optional.
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colorFn: (LinearSales sales, _) {
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// Bucket the measure column value into 3 distinct colors.
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final bucket = sales.sales / maxMeasure;
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if (bucket < 1 / 3) {
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return charts.MaterialPalette.blue.shadeDefault;
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} else if (bucket < 2 / 3) {
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return charts.MaterialPalette.red.shadeDefault;
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} else {
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return charts.MaterialPalette.green.shadeDefault;
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}
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},
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domainFn: (LinearSales sales, _) => sales.year,
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measureFn: (LinearSales sales, _) => sales.sales,
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radiusPxFn: (LinearSales sales, _) => sales.radius,
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fillColorFn: (LinearSales row, _) => row.fillColor,
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strokeWidthPxFn: (LinearSales row, _) => row.strokeWidth,
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data: data,
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)
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// Accessor function that associates each datum with a symbol renderer.
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..setAttribute(
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charts.pointSymbolRendererFnKey, (int index) => data[index].shape)
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// Default symbol renderer ID for data that have no defined shape.
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..setAttribute(charts.pointSymbolRendererIdKey, 'rect')
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];
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}
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}
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/// Sample linear data type.
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class LinearSales {
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final int year;
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final int sales;
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final double radius;
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final String? shape;
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final charts.Color? fillColor;
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final double? strokeWidth;
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LinearSales(this.year, this.sales, this.radius, this.shape, this.fillColor,
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this.strokeWidth);
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}
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