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:material_ui/material_ui.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 :       final id = data[i].dx.toInt();
      39            0 :       plot[key] = ChartData([data[i]], color: categories[id].color ?? Colors.grey, helper: categories[id]);
      40              :     }
      41            0 :     int idx = plot.values.length;
      42            0 :     return plot.values.map((e) {
      43            0 :       e.data.replaceRange(0, 1, [Offset(idx.toDouble(), e.data.first.dy)]);
      44            0 :       idx--;
      45              :       return e;
      46            0 :     }).toList();
      47              :   }
      48              : 
      49            0 :   @override
      50              :   Widget build(BuildContext context) {
      51            0 :     if (data.isEmpty) {
      52              :       return const EmptyWidget();
      53              :     }
      54            0 :     final bgColor = context.colorScheme.onSurface;
      55            0 :     final xMax = data.reduce((max, item) => item.dy > max.dy ? item : max).dy;
      56            0 :     final plot = _getData();
      57            0 :     final size = Size(width, 36.0 * (1 + plot.length));
      58            0 :     final bg = ForegroundChartPainter(
      59              :       size: size,
      60              :       color: bgColor,
      61              :       lineColor: bgColor,
      62            0 :       background: bgColor.withValues(alpha: 0.1),
      63              :       yMin: 0.0,
      64            0 :       yMax: 1.0 + plot.length,
      65              :       yType: null,
      66              :       xMin: 0.0,
      67            0 :       xMax: (xMax * 1.2).ceilToDouble(),
      68              :       xType: double,
      69            0 :       xTpl: NumberFormat.compact(locale: AppLocale.code),
      70              :     );
      71            0 :     return SizedBox(
      72            0 :       height: size.height,
      73            0 :       width: size.width,
      74            0 :       child: CustomPaint(
      75              :         size: size,
      76            0 :         painter: BarChartPainter(
      77            0 :           indent: bg.shift,
      78              :           lineColor: bgColor,
      79              :           size: size,
      80              :           data: plot,
      81            0 :           yMax: bg.yMax + 0.4,
      82            0 :           xMin: bg.xMin,
      83            0 :           xMax: bg.xMax,
      84              :         ),
      85              :         foregroundPainter: bg,
      86              :         willChange: false,
      87            0 :         child: Padding(
      88            0 :           padding: EdgeInsets.only(top: indent / 4),
      89            0 :           child: Text(tooltip),
      90              :         ),
      91              :       ),
      92              :     );
      93              :   }
      94              : }