Editing Critical canvas size

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Test case details

Title *

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var start = new Date().getTime();
window.setupCalled = false;

// Cross-browser requestAnimationFrame shim
window.requestAnimationFrame = (function() {
  return window.requestAnimationFrame ||
         window.mozRequestAnimationFrame ||
         window.webkitRequestAnimationFrame ||
         window.msRequestAnimationFrame ||
         window.oRequestAnimationFrame;
})();

if (ui.benchmarks[0].running) {
  canvas.width = 255;
  canvas.height = 240;
  ctx.fillStyle = "green";
} else if (ui.benchmarks[1].running) {
  canvas.width = 255;
  canvas.height = 250;
  ctx.fillStyle = "blue";
} else if (ui.benchmarks[2].running) {
  canvas.width = 255;
  canvas.height = 251;
  ctx.fillStyle = "orange";
} else if (ui.benchmarks[3].running) {
  canvas.width = 255;
  canvas.height = 260;
  ctx.fillStyle = "violet";
}

function isScrolledIntoView(elem) {
    var docViewTop = $(window).scrollTop();
    var docViewBottom = docViewTop + $(window).height();

var elemTop = $(elem).offset().top;
    var elemBottom = elemTop + $(elem).height();

return ((elemBottom >= docViewTop) && (elemTop <= docViewBottom)
      && (elemBottom <= docViewBottom) &&  (elemTop >= docViewTop) );
}

window.step = function() {
  if (!isScrolledIntoView(canvas)) {
    throw "Error: The canvas must be on screen!";
  }

ctx.clearRect(0, 0, 200, 200);

var progress = new Date().getTime() - start;
  var x = 100 + 20 * Math.cos(progress / 2000 * 2 * Math.PI);
  var y = 100 - 20 * Math.sin(progress / 2000 * 2 * Math.PI);
  ctx.beginPath();
  ctx.arc(x, y, 10, 0, 2*Math.PI, true);
  ctx.closePath();
  ctx.fill();

window.deferred.resolve();
};

Define teardown for all tests (runs after each clocked test loop, outside of the timed code region) (see FAQ)

Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

window.deferred = deferred;
requestAnimationFrame(step);

Test 2

Title

Async (check if this is an asynchronous test)

Code

window.deferred = deferred;
requestAnimationFrame(step);

Test 3

Title

Async (check if this is an asynchronous test)

Code

window.deferred = deferred;
requestAnimationFrame(step);

Test 4

Title

Async (check if this is an asynchronous test)

Code

window.deferred = deferred;
requestAnimationFrame(step);