felipap · December 19, 2015 17:48
diff --git a/henon.html b/henon.html
 <!DOCTYPE html>
 <html>
 	<head>
 		<style>
 			canvas { border: 1px solid #DDD; }
 		</style>
 	</head>
 	<canvas width=1500 height=1000></canvas>
 	<script>
 		var ctx = document.querySelector('canvas').getContext('2d'),
 			k = {x: 400, y:800},
 			center = {x: 600, y:500},
 			x = y = 0,
 			a = 1.4, b = 0.3;
 		setInterval(function draw() {
 			ctx.fillRect(center.x+x*k.x, center.y-y*k.y, 1, 1);
 			var _x = x;
 			x = y+1-(a*_x*_x);
 			y = b*_x;
 		}, 1);
 	</script>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<style>
	canvas { border: 1px solid #DDD; }
	</style>
	</head>
	<canvas width=1500 height=1000></canvas>
	<script>
	var ctx = document.querySelector('canvas').getContext('2d'),
	k = {x: 400, y:800},
	center = {x: 600, y:500},
	x = y = 0,
	a = 1.4, b = 0.3;
	setInterval(function draw() {
	ctx.fillRect(center.x+xk.x, center.y-yk.y, 1, 1);
	var _x = x;
	x = y+1-(a_x_x);
	y = b*_x;
	}, 1);
	</script>
	</html>