linePainter.Dart
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	import 'package:flutter/material.dart';

	class LinePainter2 extends CustomPainter {
	Paint _paint;

	List<double> x;
	List<double> y;
	var path = Path();
	//var patendpathh=path();
	LinePainter2(this.x, this.y) {
	_paint = Paint()
	..color = Colors.blue
	..strokeWidth = 3.0
	..style = PaintingStyle.stroke;
	}

	@override
	void paint(Canvas canvas, Size size) {
	// path.moveTo(0, 0);
	//canvas.restore();
	// print(x);
	for (int i = 3; i < x.length - 3; i++) {
	path.moveTo(x[i - 2], y[i - 2]);
	path.lineTo(x[i - 1], y[i - 1]);
	canvas.drawPath(path, _paint);
	// canvas.save();
	}
	// path.moveTo(0, 0);
	//path.lineTo(20, 20);
	//canvas.drawPath(path, _paint);
	}

	@override
	bool shouldRepaint(LinePainter2 oldDelegate) {
	return true;
	}
	}