JS1k: The JavaScript code golfing competition

var cv=document.getElementById("c"),c=cv.getContext('2d'),bs=new Array(),X=-1,s=0,sX=-1,iI,f=500;cv.width=f;cv.height=f;function B(i,j,k,l,m){var t=this;t.e=1;t.l=i;t.r=10*t.l;t.x=j;t.y=k;t.i=l;t.j=m;t.d=function(){c.beginPath();c.arc(t.x,t.y,t.r,0,6.3,1);c.fill();};t.s=function(){t.e=0;if(t.l>1){bs.push(new B(t.l-1,t.x,t.y,t.i,-6));bs.push(new B(t.l-1,t.x,t.y,-t.i,-6));}};};function tS(){var a=0;c.clearRect(0,0,f,f);c.fillRect(0,400,f,100);for(i in bs){var b=bs[i],x=b.x,y=b.y,r=b.r;if(b.e){if(y>400-r){b.y=400-r;b.j*=-1;}if(x>f-r){b.x=f-r;b.i*=-1;}if(x<r){b.x=r;b.i*=-1;}b.j+=0.25;b.x+=b.i;b.y+=b.j;b.d();if((X-x)*(X-x)+(390-y)*(390-y)<(r+13)*(r+13)){a=1;}}}c.fillRect(X-10,380,20,20);if(s){s--;c.beginPath();c.moveTo(X,0);c.lineTo(X,380);c.stroke();}if(a){clearInterval(iI);setTimeout(st,2000);}}function cl(){s=2;sX=X;for(i in bs){var b=bs[i];if(b.e&&Math.abs(b.x-sX)<b.r){b.s();}}}function m(e){X=e.clientX-8;}function st(){bs=[new B(6,50,50,4,0)];iI=setInterval(tS,25);}cv.onclick=cl;cv.onmousemove=m;st();

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var cv = document.getElementById("c");
cv.width = 500;
cv.height = 500;
var c = cv.getContext('2d');

var balls = new Array();

var mouseX = -1,
	shot = 0,
	shotX = -1,
	intervalId;

function Ball(newLevel, newX, newY, newSpeedX, newSpeedY) {
	var t = this;
	t.enabled = 1;
	t.level = newLevel;
	t.radius = 10*t.level;
	t.x = newX;
	t.y = newY;
	t.speedX = newSpeedX;
	t.speedY = newSpeedY;
	t.draw = function() {
		c.beginPath();
		c.arc(t.x,t.y,t.radius,0,6.3,1);  
		c.fill();
	};
	t.split = function() {
		t.enabled = 0;
		if(t.level > 1){
			balls.push(new Ball(t.level-1,t.x,t.y,t.speedX,-6));
			balls.push(new Ball(t.level-1,t.x,t.y,-t.speedX,-6));
		}
	};
};

function timeStep() {
	var stop = 0;
	c.clearRect(0,0,500,500);
	c.fillRect(0,400,500,100);
	var i;
	for(i in balls) {
		var ball = balls[i];
		if(ball.enabled) {
			if(ball.y > 400 - ball.radius) {
				ball.y = 400 - ball.radius; // needed for the balls to keep going... (not perfect though)
				ball.speedY *= -1;
			}
			if(ball.x > 500 - ball.radius) {
				ball.x = 500 - ball.radius; // idem
				ball.speedX *= -1;
			}
			if(ball.x < ball.radius) {
				ball.x = ball.radius; // idem
			ball.speedX *= -1;
			}
			ball.speedY += 0.25;
			ball.x += ball.speedX;
			ball.y += ball.speedY;
			ball.draw();
			if((mouseX - ball.x)*(mouseX - ball.x) + (390 - ball.y)*(390 - ball.y) < (ball.radius + 13)*(ball.radius + 13)) {
				stop = 1;
			}
		}
	}
	c.fillRect(mouseX-10,380,20,20);
	if(shot) {
		shot--;
		c.beginPath();
		c.moveTo(mouseX,0);
		c.lineTo(mouseX,380);
		c.stroke();
	}
	if(stop) {
		clearInterval(intervalId);
		setTimeout(start,3000);
	}
}
	
function clicked() {
	shot = 1;
	shotX = mouseX;
	var i;
	for(i in balls) {
		var ball = balls[i];
		if(ball.enabled && Math.abs(ball.x - shotX) < ball.radius) {
			ball.split();
		}
	}
}

function mousemove(e) {
	mouseX = e.clientX-8;
}

function start() {
	balls = [new Ball(6,50,50,4,0)];
	intervalId = setInterval(timeStep,25);
}

cv.onclick = clicked;
cv.onmousemove = mousemove;
start();