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 LineChartPainter extends AbstractPainter {
       9              :   final List<ChartData> data;
      10              : 
      11            1 :   LineChartPainter({
      12              :     required super.indent,
      13              :     required this.data,
      14              :     super.size,
      15              :     super.xMin = 0.0,
      16              :     super.xMax = 1.0,
      17              :     super.yMin = 1.0,
      18              :     super.yMax = 1.0,
      19              :   });
      20              : 
      21            1 :   @override
      22              :   void paint(Canvas canvas, Size size) {
      23            2 :     if (data.isEmpty) {
      24              :       return;
      25              :     }
      26            1 :     size = this.size ?? size;
      27            2 :     for (final scope in data) {
      28            4 :       _paint(canvas, scope.data, size, scope.color, scope.strokeWidth);
      29              :     }
      30              :   }
      31              : 
      32            1 :   void _paint(Canvas canvas, List<Offset> scope, Size size, Color color, [double strokeWidth = 2]) {
      33            3 :     for (int i = 1; i < scope.length; i++) {
      34            6 :       _paintLine(canvas, getValue(scope[i - 1], size), getValue(scope[i], size), color, strokeWidth);
      35              :     }
      36              :   }
      37              : 
      38            1 :   _paintLine(Canvas canvas, Offset startPoint, Offset endPoint, Color color, double strokeWidth) {
      39            1 :     final line = Paint()
      40            1 :       ..color = color
      41            1 :       ..style = PaintingStyle.stroke
      42            1 :       ..strokeWidth = strokeWidth;
      43            1 :     canvas.drawLine(startPoint, endPoint, line);
      44              :   }
      45              : }