var canvas = document.getElementById("c1");
var ctx = canvas.getContext('2d');
var r = 20;
var pi = Math.PI * 2;
        ctx.beginPath();
	ctx.arc(140,90,r,pi,false);
	ctx.filter = 'blur(5px)';	
	ctx.lineWidth = 2;
	ctx.fillStyle = "orange";
	ctx.fill();