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/charts/interface/chart_data.dart';
       5              : import 'package:app_finance/charts/painter/abstract_painter.dart';
       6              : import 'package:material_ui/material_ui.dart';
       7              : 
       8              : class BarChartPainter extends AbstractPainter {
       9              :   final List<ChartData> data;
      10              :   final Color lineColor;
      11              : 
      12            0 :   BarChartPainter({
      13              :     required super.indent,
      14              :     required this.data,
      15              :     required this.lineColor,
      16              :     super.size,
      17              :     super.xMax = 1.0,
      18              :     super.xMin = 0.0,
      19              :     super.yMax = 1.0,
      20              :   });
      21              : 
      22            0 :   @override
      23              :   void paint(Canvas canvas, Size size) {
      24            0 :     if (data.isEmpty) {
      25              :       return;
      26              :     }
      27            0 :     size = this.size ?? size;
      28            0 :     for (int i = 0; i < data.length; i++) {
      29            0 :       for (int j = 0; j < data[i].data.length; j++) {
      30            0 :         final point = data[i].data[j];
      31            0 :         _draw(canvas, size, point, data[i].color);
      32            0 :         final txtPoint = getValue(Offset(xMin, _getY(point, 0.1)), size);
      33            0 :         _paintText(canvas, txtPoint, data[i].helper.title);
      34            0 :         _paintIcon(canvas, Offset(0.0, txtPoint.dy), data[i].helper.icon);
      35              :       }
      36              :     }
      37              :   }
      38              : 
      39            0 :   _getY(Offset point, double shift) {
      40            0 :     return yMax - point.dx - shift;
      41              :   }
      42              : 
      43            0 :   void _draw(Canvas canvas, Size size, Offset point, Color color) {
      44            0 :     final paint = Paint()
      45            0 :       ..color = color
      46            0 :       ..style = PaintingStyle.fill
      47            0 :       ..strokeWidth = 1;
      48            0 :     final rect = Rect.fromPoints(
      49            0 :       getValue(Offset(xMin, _getY(point, 0.6)), size),
      50            0 :       getValue(Offset(point.dy, _getY(point, 0.9)), size),
      51              :     );
      52            0 :     canvas.drawRect(rect, paint);
      53              :   }
      54              : 
      55            0 :   void _paintText(Canvas canvas, Offset point, String text) {
      56            0 :     final textPainter = TextPainter(
      57            0 :       text: TextSpan(
      58              :         text: text,
      59            0 :         style: TextStyle(
      60            0 :           color: lineColor,
      61              :           fontSize: 11,
      62              :           fontFamily: 'Abel-Regular',
      63              :         ),
      64              :       ),
      65              :       textDirection: TextDirection.ltr,
      66              :     );
      67            0 :     textPainter.layout();
      68            0 :     textPainter.paint(canvas, point);
      69              :   }
      70              : 
      71            0 :   void _paintIcon(Canvas canvas, Offset point, IconData? icon) {
      72              :     if (icon == null) {
      73              :       return;
      74              :     }
      75            0 :     final textPainter = TextPainter(
      76            0 :       text: TextSpan(
      77            0 :         text: String.fromCharCode(icon.codePoint),
      78            0 :         style: TextStyle(
      79            0 :           color: lineColor,
      80              :           fontSize: 24,
      81            0 :           fontFamily: Icons.question_mark.fontFamily,
      82              :         ),
      83              :       ),
      84              :       textDirection: TextDirection.ltr,
      85              :     );
      86            0 :     textPainter.layout();
      87            0 :     textPainter.paint(canvas, point);
      88              :   }
      89              : }