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:flutter/material.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             : }