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 ColumnChartPainter extends AbstractPainter {
       9             :   final List<ChartData> data;
      10             :   late Canvas canvas;
      11             : 
      12           0 :   ColumnChartPainter({
      13             :     required super.indent,
      14             :     required this.data,
      15             :     super.size,
      16             :     super.xMax = 1.0,
      17             :     super.xMin = 0.0,
      18             :     super.yMax = 1.0,
      19             :   });
      20             : 
      21           0 :   @override
      22             :   void paint(Canvas canvas, Size size) {
      23           0 :     if (data.isEmpty) {
      24             :       return;
      25             :     }
      26           0 :     this.size ??= size;
      27           0 :     this.canvas = canvas;
      28           0 :     for (int i = 0; i < data.length; i++) {
      29           0 :       _draw(data[i], i / data.length);
      30             :     }
      31             :   }
      32             : 
      33           0 :   void _draw(ChartData scope, double shift) {
      34           0 :     for (int i = 0; i < scope.data.length; i++) {
      35           0 :       _drawRectangle(scope.data[i], i - shift - 1, scope.color, scope.strokeWidth);
      36             :     }
      37             :   }
      38             : 
      39           0 :   void _drawRectangle(Offset value, double shift, Color color, double stroke) {
      40           0 :     final paint = Paint()
      41           0 :       ..color = color
      42           0 :       ..style = PaintingStyle.fill
      43           0 :       ..strokeWidth = 1;
      44           0 :     final time = value.dx.toDouble();
      45           0 :     final rect = Rect.fromPoints(
      46           0 :       getValue(Offset(time - msDay * shift * 3 * stroke, value.dy), size!),
      47           0 :       getValue(Offset(time - msDay * (shift + 1) * 3 * stroke, 0.0), size!),
      48             :     );
      49           0 :     canvas.drawRect(rect, paint);
      50             :   }
      51             : }