JS1k: The JavaScript code golfing competition

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?FF"~Text(ne$$`cumGt.addEvGtListGer("key`wn",|switch%.keyCodeY37:--l	38:--m	39:lU	40:mU}}
fillparseInt(win`w.@questAnimionFrame((B(,beginPh(Nellipse(pJ+k,qJ+k/functionfor(Style=Mh.ran`m()	;b@ak;YROWS1][h],strokevar at=0;~Rect(=sc@G.avail);Mh.PI){c@eImage,gr[d][/20,00.lGg^;N
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=[],';for(Y in $='~|j`_^ZYXVUQNKJG@?>%$	
')with(_.split($[Y]))_=join(pop());eval(_)

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

var sw = screen.availWidth;
var sh = screen.availHeight;
a.width = sw;
a.height = sh;
ROWS = 16;
var st = parseInt(sh/ROWS);
var st2 = parseInt(st/2);
var ux = ROWS/2;
var uy = ROWS/2;
var coins = 0;

c.font=st+"px Arial";

var mine = [];
for (let i=0; i < ROWS; i++){
  let cells = parseInt(Math.random()* (ROWS - 1)) + 1;
  
  let line = [];
  for (let j=0; j < cells; j++) {
    line.push(!parseInt(Math.random() * 5));
  }
  mine.push([cells, line]);
}

var id = c.createImageData(8, 8);
var data = id.data;
for (let i = 0; i < data.length; i += 4) {
  let mcolor = parseInt(Math.random() * 256);
  data[i] = mcolor;
  data[i+1] = parseInt(mcolor/2);
  data[i+2] = 0;
  data[i+3] = 255;
}
//c.putImageData(id, 0, 0);

createImageBitmap(id).then(function(bi) {
  pt = c.createPattern(bi, "repeat");
  window.requestAnimationFrame(function(){
    render(pt); 
  });
});

function drawCoin(x, y) {
  c.fillStyle = "#FFD700";
  c.strokeStyle = "#000000";
  
  c.beginPath();
  c.ellipse((x*st) + st2, (y*st) + st2, st/9, st/3, 0, 0, 2 * Math.PI);
  c.fill();
  c.stroke();
  
  c.beginPath();
  c.ellipse((x*st) + st2, (y*st) + st2, st/ROWS, st/3, 0, -Math.PI/2, Math.PI/2);
  c.fill();
  c.stroke();
}

function drawTile(x, y, pt) {
   c.fillStyle=pt;
   
   // console.log(x * st, y * st); 
   c.fillRect(x * st, y * st, st, st); 
}

function drawMine(pt) {
  for (let i=0; i<mine.length; i++) {
    for (let j=0; j<mine[i][0]; j++) {
      let x = (ROWS/2) - parseInt(mine[i][0]/2) + j;
      drawTile(x, i, pt);
      
      // clean the coin where the dude is  
      if (i == uy && x == ux) {
         if (mine[i][1][j])  {
           mine[i][1][j] = 0;
           coins += 1;
         };
      }    
      
      if (mine[i][1][j]) {
        drawCoin(x, i);
      }
    }
  }
}

function drawDude(x, y) {
  c.fillStyle="#FF0000";
  c.fillRect(x * st, y*st, st, st);
}

function render(pt) {
  c.fillStyle = 'rgb(0, 0, 0)';
  c.fillRect(0, 0, sw, sh);

  drawMine(pt);
  drawDude(ux, uy);
  
  c.fillStyle = '#0000FF';
  c.fillText(coins, st,st);
  
  window.requestAnimationFrame(function() {
    render(pt);
  });
}

document.addEventListener("keydown", function(e) {
  switch(e.keyCode) {
    case 37:  // left arrow
      ux -= 1;
      break;
    case 38:  // up arrow
      uy -= 1;
      break;
    case 39:
      ux += 1;
      break;
    case 40:
      uy += 1;
      break;
  }
});