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 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             : }