JS1k: The JavaScript code golfing competition

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/* Wipeout 1k */

var M = Math;
var sin = M.sin;
var cos = M.cos;

var d = document;
var canvas = d.getElementById("c");
var ctx = canvas.getContext("2d");
d.body.style.margin = 0;
d.body.style.overflow = "hidden";
var width = canvas.width = innerWidth;
var height = canvas.height = innerHeight;

var left = -width/2;
var ttop = -height/2;

ctx.translate(-left,-ttop);

var scale = height/4;

// inefficient, I know, but hey we have the bytes :-)
var text =  ["1111   111", 
             "   1  1",
             "   1   11",
             "   1     1",
             "1  1     1",
             " 11   111",
             0,
             "  1   1  1", 
             " 11   1 1",
             "  1   11",
             "  1   11",
             "  1   1 1",
             " 111  1  1"];
var textscroll = -20;        
var textoffset = 3;        
var rings = 32;
var ringsize = 30;

var zmax = 3;
var zstep = 2*zmax / rings;
var tstep = 2*M.PI/ringsize;

var zshift = zstep;

function rgb(r,g,b) { return "rgb("+ ~~r +","+ ~~g +","+ ~~b +")" }

setInterval(function() {
  
  ctx.fillStyle = "black";
  ctx.fillRect(left,ttop,width,height);
  var date = +new Date;

  zshift-=zstep/3;
  if (zshift < 0) 
  { 
    zshift += zstep;
    textscroll++;
  };
  
  var ringb = 0;
  
  var zr=rings-1;
  while ( zr--)
  { 
    var z = zr * zstep + zshift;
    
    var color = 200-200/(zmax+zshift) * z;
    var color2 = color/2;
  
    ctx.strokeStyle = rgb(color2,color2,color2)
    
    var posx = sin(z+date/1700) * 70;
    var posy = cos(z+date/1100) * 70;
          
    var ringf = []
    for (var r=0 ; r<ringsize*4 ; r+=4)
    {
      var column = r/4;
      var t = column*tstep + M.PI + sin(date/3700); // includes roll
      
      var multiplier = scale / z;
      ringf[r] = posx + cos(t) * multiplier;
      ringf[r+1] = posy + sin(t) * multiplier;
      ringf[r+2] = posx + cos(t+tstep) * multiplier;
      ringf[r+3] = posy + sin(t+tstep) * multiplier;
      
      var textindex = (textscroll + zr) % (40);
      var textcolor1 = text[textindex] ? text[textindex][column-textoffset] : 0;
      
      var dark = color/4;
      
      ctx.fillStyle= rgb(
        +textcolor1                                 ? M.max(150 +~~(105*sin(date/100)), dark) : color2/4, 
        column % 16 == 0 && (zr + textscroll) % 12  ? 255 : dark,
        dark);  
        
      if (ringb)
      {
        ctx.beginPath();
        ctx.moveTo(ringf[r], ringf[r+1]);
        ctx.lineTo(ringf[r+2], ringf[r+3]);        
        ctx.lineTo(ringb[r+2], ringb[r+3]);
        ctx.lineTo(ringb[r], ringb[r+1]);
        ctx.fill();
        ctx.stroke();
      }
    }
    ringb = ringf;
  }
}, 50);