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250 lines
10 KiB
250 lines
10 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 RTL stacked area chart with changing styles within each line.
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///
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/// Each series of data in this example contains different values for color,
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/// dashPattern, or strokeWidthPx between each datum. The line and area skirt
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/// will be rendered in segments, with the styling of the series changing when
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/// these data attributes change.
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///
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/// Note that if a dashPattern or strokeWidth value is not found for a
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/// particular datum, then the chart will fall back to use the value defined in
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/// the [charts.LineRendererConfig]. This could be used, for example, to define
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/// a default dash pattern for the series, with only a specific datum called out
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/// with a different pattern.
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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 RTLLineSegments 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 RTLLineSegments(this.seriesList, {this.animate, Key? key})
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: super(key: key);
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/// Creates a [LineChart] with sample data and no transition.
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factory RTLLineSegments.withSampleData() {
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return RTLLineSegments(
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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 RTLLineSegments.withRandomData() {
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return RTLLineSegments(_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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// Series of data with static dash pattern and stroke width. The colorFn
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// accessor will colorize each datum (for all three series).
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final colorChangeData = [
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LinearSales(0, random.nextInt(100), null, 2.0),
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LinearSales(1, random.nextInt(100), null, 2.0),
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LinearSales(2, random.nextInt(100), null, 2.0),
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LinearSales(3, random.nextInt(100), null, 2.0),
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LinearSales(4, random.nextInt(100), null, 2.0),
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LinearSales(5, random.nextInt(100), null, 2.0),
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LinearSales(6, random.nextInt(100), null, 2.0),
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];
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// Series of data with changing color and dash pattern.
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final dashPatternChangeData = [
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LinearSales(0, random.nextInt(100), [2, 2], 2.0),
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LinearSales(1, random.nextInt(100), [2, 2], 2.0),
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LinearSales(2, random.nextInt(100), [4, 4], 2.0),
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LinearSales(3, random.nextInt(100), [4, 4], 2.0),
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LinearSales(4, random.nextInt(100), [4, 4], 2.0),
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LinearSales(5, random.nextInt(100), [8, 3, 2, 3], 2.0),
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LinearSales(6, random.nextInt(100), [8, 3, 2, 3], 2.0),
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];
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// Series of data with changing color and stroke width.
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final strokeWidthChangeData = [
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LinearSales(0, random.nextInt(100), null, 2.0),
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LinearSales(1, random.nextInt(100), null, 2.0),
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LinearSales(2, random.nextInt(100), null, 4.0),
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LinearSales(3, random.nextInt(100), null, 4.0),
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LinearSales(4, random.nextInt(100), null, 4.0),
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LinearSales(5, random.nextInt(100), null, 6.0),
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LinearSales(6, random.nextInt(100), null, 6.0),
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];
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// Generate 2 shades of each color so that we can style the line segments.
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final blue = charts.MaterialPalette.blue.makeShades(2);
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final red = charts.MaterialPalette.red.makeShades(2);
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final green = charts.MaterialPalette.green.makeShades(2);
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return [
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charts.Series<LinearSales, int>(
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id: 'Color Change',
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// Light shade for even years, dark shade for odd.
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colorFn: (LinearSales sales, _) =>
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sales.year % 2 == 0 ? blue[1] : blue[0],
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dashPatternFn: (LinearSales sales, _) => sales.dashPattern,
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strokeWidthPxFn: (LinearSales sales, _) => sales.strokeWidthPx,
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domainFn: (LinearSales sales, _) => sales.year,
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measureFn: (LinearSales sales, _) => sales.sales,
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data: colorChangeData,
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),
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charts.Series<LinearSales, int>(
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id: 'Dash Pattern Change',
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// Light shade for even years, dark shade for odd.
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colorFn: (LinearSales sales, _) =>
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sales.year % 2 == 0 ? red[1] : red[0],
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dashPatternFn: (LinearSales sales, _) => sales.dashPattern,
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strokeWidthPxFn: (LinearSales sales, _) => sales.strokeWidthPx,
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domainFn: (LinearSales sales, _) => sales.year,
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measureFn: (LinearSales sales, _) => sales.sales,
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data: dashPatternChangeData,
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),
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charts.Series<LinearSales, int>(
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id: 'Stroke Width Change',
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// Light shade for even years, dark shade for odd.
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colorFn: (LinearSales sales, _) =>
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sales.year % 2 == 0 ? green[1] : green[0],
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dashPatternFn: (LinearSales sales, _) => sales.dashPattern,
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strokeWidthPxFn: (LinearSales sales, _) => sales.strokeWidthPx,
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domainFn: (LinearSales sales, _) => sales.year,
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measureFn: (LinearSales sales, _) => sales.sales,
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data: strokeWidthChangeData,
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),
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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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// Charts will determine if RTL is enabled by checking the directionality by
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// requesting Directionality.of(context). This returns the text direction
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// from the closest instance of that encloses the context passed to build
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// the chart. A [TextDirection.rtl] will be treated as a RTL chart. This
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// means that the directionality widget does not have to directly wrap each
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// chart. It is show here as an example only.
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//
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// By default, when a chart detects RTL:
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// Measure axis positions are flipped. Primary measure axis is on the right
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// and the secondary measure axis is on the left (when used).
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// Domain axis' first domain starts on the right and grows left.
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return Directionality(
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textDirection: TextDirection.rtl,
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child: charts.LineChart(
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seriesList,
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defaultRenderer:
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charts.LineRendererConfig(includeArea: true, stacked: true),
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animate: animate,
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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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// Series of data with static dash pattern and stroke width. The colorFn
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// accessor will colorize each datum (for all three series).
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final colorChangeData = [
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LinearSales(0, 5, null, 2.0),
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LinearSales(1, 15, null, 2.0),
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LinearSales(2, 25, null, 2.0),
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LinearSales(3, 75, null, 2.0),
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LinearSales(4, 100, null, 2.0),
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LinearSales(5, 90, null, 2.0),
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LinearSales(6, 75, null, 2.0),
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];
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// Series of data with changing color and dash pattern.
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final dashPatternChangeData = [
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LinearSales(0, 5, [2, 2], 2.0),
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LinearSales(1, 15, [2, 2], 2.0),
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LinearSales(2, 25, [4, 4], 2.0),
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LinearSales(3, 75, [4, 4], 2.0),
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LinearSales(4, 100, [4, 4], 2.0),
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LinearSales(5, 90, [8, 3, 2, 3], 2.0),
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LinearSales(6, 75, [8, 3, 2, 3], 2.0),
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];
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// Series of data with changing color and stroke width.
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final strokeWidthChangeData = [
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LinearSales(0, 5, null, 2.0),
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LinearSales(1, 15, null, 2.0),
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LinearSales(2, 25, null, 4.0),
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LinearSales(3, 75, null, 4.0),
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LinearSales(4, 100, null, 4.0),
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LinearSales(5, 90, null, 6.0),
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LinearSales(6, 75, null, 6.0),
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];
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// Generate 2 shades of each color so that we can style the line segments.
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final blue = charts.MaterialPalette.blue.makeShades(2);
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final red = charts.MaterialPalette.red.makeShades(2);
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final green = charts.MaterialPalette.green.makeShades(2);
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return [
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charts.Series<LinearSales, int>(
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id: 'Color Change',
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// Light shade for even years, dark shade for odd.
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colorFn: (LinearSales sales, _) =>
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sales.year % 2 == 0 ? blue[1] : blue[0],
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dashPatternFn: (LinearSales sales, _) => sales.dashPattern,
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strokeWidthPxFn: (LinearSales sales, _) => sales.strokeWidthPx,
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domainFn: (LinearSales sales, _) => sales.year,
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measureFn: (LinearSales sales, _) => sales.sales,
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data: colorChangeData,
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),
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charts.Series<LinearSales, int>(
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id: 'Dash Pattern Change',
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// Light shade for even years, dark shade for odd.
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colorFn: (LinearSales sales, _) =>
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sales.year % 2 == 0 ? red[1] : red[0],
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dashPatternFn: (LinearSales sales, _) => sales.dashPattern,
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strokeWidthPxFn: (LinearSales sales, _) => sales.strokeWidthPx,
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domainFn: (LinearSales sales, _) => sales.year,
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measureFn: (LinearSales sales, _) => sales.sales,
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data: dashPatternChangeData,
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),
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charts.Series<LinearSales, int>(
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id: 'Stroke Width Change',
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// Light shade for even years, dark shade for odd.
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colorFn: (LinearSales sales, _) =>
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sales.year % 2 == 0 ? green[1] : green[0],
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dashPatternFn: (LinearSales sales, _) => sales.dashPattern,
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strokeWidthPxFn: (LinearSales sales, _) => sales.strokeWidthPx,
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domainFn: (LinearSales sales, _) => sales.year,
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measureFn: (LinearSales sales, _) => sales.sales,
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data: strokeWidthChangeData,
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),
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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 List<int>? dashPattern;
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final double strokeWidthPx;
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LinearSales(this.year, this.sales, this.dashPattern, this.strokeWidthPx);
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}
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