Line data    Source code

       1             : // Copyright 2023 The terCAD team. All rights reserved.
       2             : // Use of this source code is governed by a CC BY-NC-ND 4.0 license that can be found in the LICENSE file.
       3             : 
       4             : import 'dart:collection';
       5             : import 'dart:math';
       6             : 
       7             : import 'package:app_finance/_classes/herald/app_locale.dart';
       8             : import 'package:app_finance/_classes/structure/interface_app_data.dart';
       9             : import 'package:app_finance/_ext/build_context_ext.dart';
      10             : import 'package:app_finance/charts/interface/chart_data.dart';
      11             : import 'package:app_finance/charts/painter/bar_chart_painter.dart';
      12             : import 'package:app_finance/charts/painter/foreground_chart_painter.dart';
      13             : import 'package:app_finance/design/generic/empty_widget.dart';
      14             : import 'package:flutter/material.dart';
      15             : import 'package:intl/intl.dart';
      16             : 
      17             : class BarRaceChart extends StatelessWidget {
      18             :   final double width;
      19             :   final double indent;
      20             :   final String tooltip;
      21             :   final List<InterfaceAppData> categories;
      22             :   final List<Offset> data;
      23             : 
      24           0 :   const BarRaceChart({
      25             :     super.key,
      26             :     required this.data,
      27             :     required this.categories,
      28             :     required this.width,
      29             :     this.indent = 0.0,
      30             :     this.tooltip = '',
      31             :   });
      32             : 
      33           0 :   List<ChartData> _getData() {
      34           0 :     final plot = SplayTreeMap<double, ChartData>();
      35           0 :     final rnd = Random();
      36           0 :     for (int i = 0; i < data.length; i++) {
      37           0 :       final key = data[i].dy + rnd.nextDouble();
      38           0 :       plot[key] = ChartData([data[i]], color: categories[i].color ?? Colors.grey, helper: categories[i]);
      39             :     }
      40           0 :     int idx = plot.values.length;
      41           0 :     return plot.values.map((e) {
      42           0 :       e.data.replaceRange(0, 1, [Offset(idx.toDouble(), e.data.first.dy)]);
      43           0 :       idx--;
      44             :       return e;
      45           0 :     }).toList();
      46             :   }
      47             : 
      48           0 :   @override
      49             :   Widget build(BuildContext context) {
      50           0 :     if (data.isEmpty) {
      51             :       return const EmptyWidget();
      52             :     }
      53           0 :     final bgColor = context.colorScheme.onSurface;
      54           0 :     final xMax = data.reduce((max, item) => item.dy > max.dy ? item : max).dy;
      55           0 :     final plot = _getData();
      56           0 :     final size = Size(width, 36.0 * (1 + plot.length));
      57           0 :     final bg = ForegroundChartPainter(
      58             :       size: size,
      59             :       color: bgColor,
      60             :       lineColor: bgColor,
      61           0 :       background: bgColor.withOpacity(0.1),
      62             :       yMin: 0.0,
      63           0 :       yMax: 1.0 + plot.length,
      64             :       yType: null,
      65             :       xMin: 0.0,
      66           0 :       xMax: (xMax * 1.2).ceilToDouble(),
      67             :       xType: double,
      68           0 :       xTpl: NumberFormat.compact(locale: AppLocale.code),
      69             :     );
      70           0 :     return SizedBox(
      71           0 :       height: size.height,
      72           0 :       width: size.width,
      73           0 :       child: CustomPaint(
      74             :         size: size,
      75           0 :         painter: BarChartPainter(
      76           0 :           indent: bg.shift,
      77             :           lineColor: bgColor,
      78             :           size: size,
      79             :           data: plot,
      80           0 :           yMax: bg.yMax + 0.4,
      81           0 :           xMin: bg.xMin,
      82           0 :           xMax: bg.xMax,
      83             :         ),
      84             :         foregroundPainter: bg,
      85             :         willChange: false,
      86           0 :         child: Padding(
      87           0 :           padding: EdgeInsets.only(top: indent / 4),
      88           0 :           child: Text(tooltip),
      89             :         ),
      90             :       ),
      91             :     );
      92             :   }
      93             : }