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             : 
       6             : import 'package:app_finance/_classes/herald/app_locale.dart';
       7             : import 'package:app_finance/_classes/structure/transaction_log_data.dart';
       8             : import 'package:app_finance/_ext/build_context_ext.dart';
       9             : import 'package:app_finance/charts/interface/chart_data.dart';
      10             : import 'package:app_finance/charts/interface/data_scope.dart';
      11             : import 'package:app_finance/charts/painter/foreground_chart_painter.dart';
      12             : import 'package:app_finance/charts/painter/line_chart_painter.dart';
      13             : import 'package:flutter/material.dart';
      14             : import 'package:intl/intl.dart';
      15             : 
      16             : class TradeChart extends StatelessWidget {
      17             :   final double width;
      18             :   final double height;
      19             :   final double indent;
      20             :   final String tooltip;
      21             :   final List<TransactionLogData> data;
      22             : 
      23           0 :   const TradeChart({
      24             :     super.key,
      25             :     required this.data,
      26             :     required this.width,
      27             :     required this.height,
      28             :     this.indent = 0.0,
      29             :     this.tooltip = '',
      30             :   });
      31             : 
      32           0 :   DataScope _prepareData() {
      33           0 :     final result = SplayTreeMap<double, Offset>();
      34           0 :     final xMax = DateTime.now().millisecondsSinceEpoch.toDouble();
      35           0 :     double yMin = data.firstOrNull?.changedTo ?? 0.0;
      36             :     double yMax = 0.0;
      37           0 :     for (int i = 0; i < data.length; i++) {
      38           0 :       final time = data[i].timestamp;
      39           0 :       final x = DateTime(time.year, time.month, time.day).millisecondsSinceEpoch.toDouble();
      40           0 :       if (!result.containsKey(x) || result[x]!.dy < data[i].changedTo) {
      41           0 :         result[x] = Offset(x, data[i].changedTo ?? 0.0);
      42             :       }
      43           0 :       if (data[i].changedTo > yMax) {
      44           0 :         yMax = data[i].changedTo;
      45             :       }
      46           0 :       if (data[i].changedTo < yMin) {
      47           0 :         yMin = data[i].changedTo;
      48             :       }
      49             :     }
      50           0 :     final scope = result.values.toList();
      51           0 :     return DataScope(
      52             :       xMax: xMax,
      53           0 :       xMin: scope.firstOrNull?.dx ?? xMax,
      54           0 :       yMin: yMin * 0.8,
      55           0 :       yMax: yMax * 1.2,
      56           0 :       data: [
      57           0 :         ChartData(
      58             :           scope,
      59           0 :           color: scope.isNotEmpty && scope.first.dy > scope.last.dy ? Colors.orange : Colors.blue,
      60             :         ),
      61           0 :         if (scope.isNotEmpty)
      62           0 :           ChartData([
      63           0 :             scope.first,
      64           0 :             Offset(DateTime.now().millisecondsSinceEpoch.toDouble(), scope.first.dy),
      65             :           ], color: Colors.grey, strokeWidth: 1)
      66             :       ],
      67             :     );
      68             :   }
      69             : 
      70           0 :   @override
      71             :   Widget build(BuildContext context) {
      72           0 :     final size = Size(width, height);
      73           0 :     final bgColor = context.colorScheme.onSurface;
      74           0 :     final scope = _prepareData();
      75             : 
      76           0 :     final bg = ForegroundChartPainter(
      77             :       size: size,
      78             :       color: bgColor,
      79             :       lineColor: bgColor,
      80           0 :       background: Colors.white.withOpacity(0.0),
      81           0 :       yMin: scope.yMin,
      82           0 :       yMax: scope.yMax,
      83             :       xType: DateTime,
      84           0 :       xMin: scope.xMin,
      85           0 :       xMax: scope.xMax,
      86             :       xDivider: 16,
      87           0 :       xTpl: DateFormat.Md(AppLocale.code),
      88             :     );
      89             : 
      90           0 :     return SizedBox(
      91           0 :       height: size.height,
      92           0 :       width: size.width,
      93           0 :       child: CustomPaint(
      94             :         size: size,
      95           0 :         painter: LineChartPainter(
      96           0 :           indent: bg.shift,
      97             :           size: size,
      98           0 :           data: scope.data,
      99           0 :           yMin: scope.yMin,
     100           0 :           yMax: scope.yMax,
     101           0 :           xMin: bg.xMin,
     102           0 :           xMax: bg.xMax,
     103             :         ),
     104             :         foregroundPainter: bg,
     105             :         willChange: false,
     106           0 :         child: Padding(
     107           0 :           padding: EdgeInsets.only(top: indent / 4),
     108           0 :           child: Text(tooltip),
     109             :         ),
     110             :       ),
     111             :     );
     112             :   }
     113             : }