Koło fortuny

Cześć, prosiłbym o pomoc w skrypcie koła fortuny. Czy potrafiłby ktoś przerobić ten skrypt aby te 2 pola (zielony i czerwony) były 2 połówkami koła? tzn. żeby były szersze, na całe koło? I żeby zamiast napisu mogła być grafika?

<script>
var colors = ["#B8D430","red"];
  var restaraunts = ["cos","x"];
 
  var startAngle = 0;
  var arc = Math.PI / 15;
  var losujTimeout = null;
 
  var losujArcStart = 10;
  var losujTime = 0;
  var losujTimeTotal = 0;
 
  var ctx;
 
  function draw() {
    drawRouletteWheel();
  }
 
  function drawRouletteWheel() {
    var canvas = document.getElementById("wheelcanvas");
    if (canvas.getContext) {
      var outsideRadius = 200;
      var textRadius = 160;
      var insideRadius = 125;
 
      ctx = canvas.getContext("2d");
      ctx.clearRect(0,0,500,500);
 
 
      ctx.strokeStyle = "pink";
      ctx.lineWidth = 12;
 
      ctx.font = 'bold 12px sans-serif';
 
      for(var i = 0; i < 2; i++) {
        var angle = startAngle + i * arc;
        ctx.fillStyle = colors[i];
 
        ctx.beginPath();
        ctx.arc(250, 250, outsideRadius, angle, angle + arc, false);
        ctx.arc(250, 250, insideRadius, angle + arc, angle, true);
        ctx.stroke();
        ctx.fill();
 
        ctx.save();
        ctx.shadowOffsetX = -1;
        ctx.shadowOffsetY = -1;
        ctx.shadowBlur    = 0;
        ctx.shadowColor   = "rgb(220,220,220)";
        ctx.fillStyle = "black";
        ctx.translate(250 + Math.cos(angle + arc / 2) * textRadius, 250 + Math.sin(angle + arc / 2) * textRadius);
        ctx.rotate(angle + arc / 2 + Math.PI / 2);
        var text = restaraunts[i];
        ctx.fillText(text, -ctx.measureText(text).width / 2, 0);
        ctx.restore();
      }
 
      //Arrow
      ctx.fillStyle = "black";
      ctx.beginPath();
      ctx.moveTo(250 - 4, 250 - (outsideRadius + 5));
      ctx.lineTo(250 + 4, 250 - (outsideRadius + 5));
      ctx.lineTo(250 + 4, 250 - (outsideRadius - 5));
      ctx.lineTo(250 + 9, 250 - (outsideRadius - 5));
      ctx.lineTo(250 + 0, 250 - (outsideRadius - 13));
      ctx.lineTo(250 - 9, 250 - (outsideRadius - 5));
      ctx.lineTo(250 - 4, 250 - (outsideRadius - 5));
      ctx.lineTo(250 - 4, 250 - (outsideRadius + 5));
      ctx.fill();
    }
  }
 
  function losuj() {
    losujAngleStart = Math.random() * 10 + 10;
    losujTime = 0;
    losujTimeTotal = Math.random() * 3 + 4 * 1000;
    rotateWheel();
  }
 
  function rotateWheel() {
    losujTime += 30;
    if(losujTime >= losujTimeTotal) {
      stopRotateWheel();
      return;
    }
    var losujAngle = losujAngleStart - easeOut(losujTime, 0, losujAngleStart, losujTimeTotal);
    startAngle += (losujAngle * Math.PI / 180);
    drawRouletteWheel();
    losujTimeout = setTimeout('rotateWheel()', 30);
  }
 
  function stopRotateWheel() {
    clearTimeout(losujTimeout);
    var degrees = startAngle * 180 / Math.PI + 90;
    var arcd = arc * 180 / Math.PI;
    var index = Math.floor((360 - degrees % 360) / arcd);
    ctx.save();
    ctx.font = 'bold 30px sans-serif';
    var text = restaraunts[index]
    ctx.fillText(text, 250 - ctx.measureText(text).width / 2, 250 + 10);
    ctx.restore();
  }
 
  function easeOut(t, b, c, d) {
    var ts = (t/=d)*t;
    var tc = ts*t;
    return b+c*(tc + -3*ts + 3*t);
  }
 
  draw();
</script>
<input type="button" value="Losowanie!" onclick="losuj();" style="float: left;" />
<canvas id="wheelcanvas" width="500" height="500"></canvas>