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

	class LinePainter extends CustomPainter {
	Paint _paint;

	Offset beginpath;
	Offset endpath;
	var path = Path();
	//var patendpathh=path();
	LinePainter(this.beginpath, this.endpath) {
	_paint = Paint()
	..color = Colors.blue
	..strokeWidth = 8.0
	..style = PaintingStyle.stroke;
	}

	@override
	void paint(Canvas canvas, Size size) {
	// path.moveTo(0, 0);

	path.moveTo(beginpath.dx, beginpath.dy);
	path.lineTo(endpath.dx, endpath.dy);
	canvas.drawPath(path, _paint);
	// canvas.saveLayer(bounds, paint);
	}

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

	class LinePainter2 extends CustomPainter {
	Paint _paint;
	double _progress;
	List<double> x;
	List<double> y;
	Color linecolor;
	var path = Path();
	//var patendpathh=path();
	LinePainter2(this.x, this.y, this.linecolor) {
	_paint = Paint()
	..color = this.linecolor
	..strokeWidth = 8.0
	..style = PaintingStyle.stroke;
	}

	@override
	void paint(Canvas canvas, Size size) {
	// path.moveTo(0, 0);
	for (int i = 4; i < x.length; i++) {
	//path.moveTo(x[i - 2], y[i - 2]);
	// path.lineTo(x[i - 1], y[i - 1]);
	// canvas.drawPath(path, _paint);
	canvas.drawLine(
	Offset(x[i - 2], y[i - 2]), Offset(x[i - 1], y[i - 1]), _paint);
	}
	}

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

	LinePainter linepainter = new LinePainter(Offset(0, 0), Offset(0, 10));