text: /*global document */
  /*global window */
  
  var canvas = document.getElementById("main-canvas");
  var context = canvas.getContext("2d");
  var speed = 1;
  var angleIncr = 0.1;
  var previous = null;
  var primes = 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291,8293,8297,8311,8317,8329,8353,8363,8369,8377,8387,8389,8419,8423,8429,8431,8443,8447,8461,8467,8501,8513,8521,8527,8537,8539,8543,8563,8573,8581,8597,8599,8609,8623,8627,8629,8641,8647,8663,8669,8677,8681,8689,8693,8699,8707,8713,8719,8731,8737,8741,8747,8753,8761,8779,8783,8803,8807,8819,8821,8831,8837,8839,8849,8861,8863,8867,8887,8893,8923,8929,8933,8941,8951,8963,8969,8971,8999,9001,9007,9011,9013,9029,9041,9043,9049,9059,9067,9091,9103,9109,9127,9133,9137,9151,9157,9161,9173,9181,9187,9199,9203,9209,9221,9227,9239,9241,9257,9277,9281,9283,9293,9311,9319,9323,9337,9341,9343,9349,9371,9377,9391,9397,9403,9413,9419,9421,9431,9433,9437,9439,9461,9463,9467,9473,9479,9491,9497,9511,9521,9533,9539,9547,9551,9587,9601,9613,9619,9623,9629,9631,9643,9649,9661,9677,9679,9689,9697,9719,9721,9733,9739,9743,9749,9767,9769,9781,9787,9791,9803,9811,9817,9829,9833,9839,9851,9857,9859,9871,9883,9887,9901,9907,9923,9929,9931,9941,9949,9967,9973];
  
  Math.toRadians = function (degrees) {
      "use strict";
      return degrees * Math.PI / 180;
  };
  
  Math.toDegrees = function (radians) {
      "use strict";
      return radians * 180 / Math.PI;
  };
  
  function clearCanvas() {
      "use strict";
      context.clearRect(0, 0, canvas.width, canvas.height);
  }
  
  function circle(x, y, radius, color) {
      "use strict";
      context.beginPath();
      context.arc(x, y, radius, 0, 2 * Math.PI, false);
      context.lineWidth = 1;
      context.strokeStyle = color;
      context.stroke();
  }
  
  function distance(x1, y1, x2, y2) {
      "use strict";
      return Math.sqrt(Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2), 2);
  }
  
  function circle(x, y, radius, color) {
      "use strict";
      var previousFillStyle = context.fillStyle;
  
      context.beginPath();
      context.arc(x, y, radius, 0, 2 * Math.PI, false);
      context.fillStyle = color;
      context.fill();
      context.strokeStyle = 'transparent';
      context.stroke();
      context.closePath();
  
      context.fillStyle = previousFillStyle;
  }
  
  function spiral(cx, cy, a, b) {
      "use strict";
      context.moveTo(cx, cy);
      context.beginPath();
      var i, j = 1, angle, x, y, angled = 0;
      for (i = 0; i < 30000; i = i + 1) {
          angle = 0.01 * i;
          x = cx + (a + b * angle) * Math.cos(angle);
          y = cy + (a + b * angle) * Math.sin(angle);
          context.lineTo(x, y);
      }
      context.strokeStyle = "#DDD";
      context.stroke();
  }
  
  function mod(n, m) {
      return ((n % m) + m) % m;
  }
  
  function spiraledNumbers(cx, cy, a, b) {
      "use strict";
      var i, j = 1, angle = 0, x, y, angled = 0;
      for (i = 0; i < 30000; i = i + 1) {
          angle = angle + angleIncr;
          x = cx + (a + b * angle) * Math.cos(angle);
          y = cy + (a + b * angle) * Math.sin(angle);
          if(primes.indexOf(i) != -1) {
              circle(x, y, 2, "#F00");
          } else {
              circle(x, y, 2, "#DDD");
          }
      }
  }
  
  
  function updateCanvasSize() {
      "use strict";
      canvas.width = canvas.scrollWidth;
      canvas.height = canvas.scrollHeight;
  }
  
  function draw() {
      "use strict";
      clearCanvas();
      spiral(canvas.width / 2, canvas.height / 2, 1, 5);
      spiraledNumbers(canvas.width / 2, canvas.height / 2, 1, 5)
  }
  
  function runOnScroll(evt) {
      "use strict";
      var step = 1;
  
      if (evt.shiftKey) {
          step = 10;
      }
      if (evt.deltaY >= 0) {
  
          speed += step;
      } else {
          speed -= step;
      }
      draw();
  }
  
  function animate() {
      "use strict";
      window.requestAnimationFrame(animate);
      angleIncr += angleIncr*speed/100000;
      draw();
  }
  
  if (canvas.addEventListener) {
      // IE9, Chrome, Safari, Opera
      canvas.addEventListener("mousewheel", runOnScroll, false);
      // Firefox
      canvas.addEventListener("DOMMouseScroll", runOnScroll, false);
  } else { // IE 6/7/8
      canvas.attachEvent("onmousewheel", runOnScroll);
  }
  
  window.addEventListener("resize", function () {
      "use strict";
      updateCanvasSize();
  });
  
  document.addEventListener("keypress", function (evt) {
      "use strict";
      if (evt.keyCode == 115) {
          speed = 0;
      }
  });
  
  updateCanvasSize();
  draw();
  animate();