Minified code (1016 bytes):

n=document.body.children[0];with(n){c=getContext('2d');width=w=720;height=h=480;
g=X=Y=x=y=i=o=0;z=65;d=function(a,b,c,d){return((a-c)*(a-c)+(b-d)*(b-d))};
onmousedown=function(e){if(d(X,Y,x,y)83200){
x=y=0;z++;v()}}}onmousemove=function(e){X=e.pageX+.1;Y=e.pageY+.1};b=function(){
if(g){x=X;y=Y;if(x<0)x=.1;if(y<0)y=.1}else{x=x*.9+3;y=y*.9+6}r()};with(c){
r=function(){font="bold 140px sans-serif";textAlign="center";save();
clearRect(0,0,w,h);p(i,z+1,0);beginPath();moveTo(y*y/2/x+x/2,0);lineTo(w*2,0);
lineTo(0,h*2);lineTo(0,x*x/2/y+y/2);clip();p(o,z,0);translate(x,y);
rotate(Math.atan2(y,x)*2);scale(-1,1);p(o,z,1);restore()};p=function(s,l,b){
fillStyle="#"+s;e();f(0);fillText(String.fromCharCode(l),w/6,125);if(b){f(255);
e()}};f=function(s){fillStyle="rgba("+s+","+s+","+s+",.4)"};e=function(){
fillRect(0,0,w/3,h/3)}}v=function(){o=i;for(i=0;i<100;i=i*10+Math.random()*4+5);
i-=i%1};v();v();setInterval("b()",35);

Description

JS1k is a javascript code golfing competition with the following rules:

• Submissions may be up to 1024 bytes
• Inclusion of external libraries is strictly forbidden
• Minification and hacks are allowed
• Must run without errors on all major browsers

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Technology

• HTML 5
• Javascript