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 'package:app_finance/_classes/herald/app_locale.dart';
       5              : import 'package:app_finance/_ext/build_context_ext.dart';
       6              : import 'package:app_finance/charts/interface/ohlc_data.dart';
       7              : import 'package:app_finance/charts/painter/foreground_chart_painter.dart';
       8              : import 'package:app_finance/charts/painter/ohlc_chart_painter.dart';
       9              : import 'package:app_finance/design/generic/empty_widget.dart';
      10              : import 'package:material_ui/material_ui.dart';
      11              : import 'package:intl/intl.dart';
      12              : 
      13              : class OhlcChart extends StatelessWidget {
      14              :   final double width;
      15              :   final double height;
      16              :   final double indent;
      17              :   final DateTime xMin;
      18              :   final String tooltip;
      19              :   final List<OhlcData> data;
      20              : 
      21            0 :   const OhlcChart({
      22              :     super.key,
      23              :     required this.data,
      24              :     required this.width,
      25              :     required this.height,
      26              :     required this.xMin,
      27              :     this.indent = 0.0,
      28              :     this.tooltip = '',
      29              :   });
      30              : 
      31            0 :   @override
      32              :   Widget build(BuildContext context) {
      33              :     double yMin = 0.0;
      34              :     double yMax = 0.0;
      35            0 :     for (int i = 0; i < data.length; i++) {
      36            0 :       if (data[i].low < yMin) yMin = data[i].low;
      37            0 :       if (data[i].high > yMax) yMax = data[i].high;
      38              :     }
      39            0 :     if (data.isEmpty || yMax == 0.0) {
      40              :       return const EmptyWidget();
      41              :     }
      42            0 :     yMax *= 1.25;
      43            0 :     final now = DateTime.now();
      44            0 :     final size = Size(width, height);
      45            0 :     final bgColor = context.colorScheme.onSurface;
      46            0 :     final xMax = DateTime(now.year, now.month + 1);
      47            0 :     final bg = ForegroundChartPainter(
      48              :       size: size,
      49              :       color: bgColor,
      50              :       lineColor: bgColor,
      51            0 :       background: bgColor.withValues(alpha: 0.1),
      52              :       yMin: yMin,
      53              :       yMax: yMax,
      54            0 :       yTpl: NumberFormat.compact(locale: AppLocale.code),
      55              :       xType: DateTime,
      56            0 :       xMin: xMin.millisecondsSinceEpoch.toDouble(),
      57            0 :       xMax: xMax.millisecondsSinceEpoch.toDouble(),
      58              :       xDivider: 6,
      59            0 :       xTpl: DateFormat.Md(AppLocale.code),
      60              :     );
      61            0 :     return SizedBox(
      62            0 :       height: size.height,
      63            0 :       width: size.width,
      64            0 :       child: CustomPaint(
      65              :         size: size,
      66            0 :         painter: OhlcChartPainter(
      67            0 :           indent: bg.shift,
      68              :           color: bgColor,
      69              :           size: size,
      70            0 :           data: data,
      71              :           yMax: yMax,
      72            0 :           xMin: xMin.millisecondsSinceEpoch.toDouble(),
      73            0 :           xMax: xMax.millisecondsSinceEpoch.toDouble(),
      74              :         ),
      75              :         foregroundPainter: bg,
      76              :         willChange: false,
      77            0 :         child: Padding(
      78            0 :           padding: EdgeInsets.only(top: indent / 4),
      79            0 :           child: Text(tooltip),
      80              :         ),
      81              :       ),
      82              :     );
      83              :   }
      84              : }