import 'dart:html';
import 'dart:async';
import 'dart:math';

CanvasElement myCanvas;
CanvasRenderingContext2D context;
var randomGenerator = new Random();


DivElement output = querySelector('#output');
Duration longDuration = new Duration(seconds:3);
Duration shortDuration = new Duration(milliseconds: 500);
Future longPause() => new Future.delayed(longDuration);
Future shortPause() => new Future.delayed(shortDuration);

Future main() async {
    myCanvas = querySelector("#mycanvas");
    context = myCanvas.context2D;
    for (int i = 1; i < 2; i++) {
        context.beginPath();
        context.lineWidth = 10;
        context.strokeStyle = "blue";
        var start = new Point(200, 300);
        var end = new Point(200, 400);
        context.moveTo(start.x, start.y);
        context.lineTo(end.x, end.y);
        context.stroke();
        await longPause();
    }
}