First

README

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+The MIT License
+
+Copyright (c) 2010 Mr.doob
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

src/stats.js

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+/*
+ * stats.js 1.2
+ * http://code.google.com/p/mrdoob/wiki/stats_js
+ *
+ * Released under MIT license:
+ * http://www.opensource.org/licenses/mit-license.php
+ *
+ * How to use:
+ *
+ *  var stats = new Stats();
+ *  dom_element.appendChild( stats.getDisplayElement() );
+ *
+ *  setInterval(loop, 1000/60);
+ *
+ *  function loop()
+ *  {
+ *     stats.update();
+ *  }
+ *
+ * version log:
+ *
+ *	10.03.01		1.2		Mr.doob		+ Simplified
+ *	10.02.21		1.1		Mr.doob		+ Accurate FPS calculation (thx Spite!)
+ *	09.08.10		1.0		Mr.doob		+ Base code
+ *	
+ */
+
+function Stats()
+{
+	this.init();
+}
+
+Stats.prototype =
+{
+	init: function()
+	{
+		this.frames = 0;
+		this.framesMin = 1000;
+		this.framesMax = 0;
+
+		this.time = new Date().getTime();
+		this.timePrev = new Date().getTime(); 
+
+		this.container = document.createElement("div");
+		this.container.style.position = 'absolute';
+		this.container.style.fontFamily = 'Arial';
+		this.container.style.fontSize = '10px';
+		this.container.style.backgroundColor = '#000020';
+		this.container.style.opacity = '0.9';
+		this.container.style.width = '80px';
+		this.container.style.paddingTop = '2px';
+
+		this.framesText = document.createElement("div");
+		this.framesText.style.color = '#00ffff';
+		this.framesText.style.marginLeft = '3px';
+		this.framesText.style.marginBottom = '3px';
+		this.framesText.innerHTML = '<strong>FPS</strong>';
+		this.container.appendChild(this.framesText);
+
+		this.canvas = document.createElement("canvas");
+		this.canvas.width = 74;
+		this.canvas.height = 30;
+		this.canvas.style.display = 'block';
+		this.canvas.style.marginLeft = '3px';
+		this.canvas.style.marginBottom = '3px';
+		this.container.appendChild(this.canvas);
+
+		this.context = this.canvas.getContext("2d");
+		this.context.fillStyle = '#101030';
+		this.context.fillRect(0, 0, this.canvas.width, this.canvas.height );
+
+		this.contextImageData = this.context.getImageData(0, 0, this.canvas.width, this.canvas.height);
+	},
+
+	getDisplayElement: function()
+	{
+		return this.container;
+	},
+
+	update: function()
+	{
+		this.frames++
+
+		this.time = new Date().getTime();
+
+		if (this.time >= this.timePrev + 1000)
+		{
+			this.fps = Math.round((this.frames * 1000 ) / (this.time - this.timePrev));
+
+			this.framesMin = Math.min(this.framesMin, this.fps);
+			this.framesMax = Math.max(this.framesMax, this.fps);
+
+			this.framesText.innerHTML = '<strong>' + this.fps + ' FPS</strong> (' + this.framesMin + '-' + this.framesMax + ')';
+
+			this.contextImageData = this.context.getImageData(1, 0, this.canvas.width - 1, 30);
+			this.context.putImageData(this.contextImageData, 0, 0);
+
+			this.context.fillStyle = '#101030';
+			this.context.fillRect(this.canvas.width - 1, 0, 1, 30);
+
+			this.index = ( Math.floor(30 - Math.min(30, (this.fps / 60) * 30)) );
+
+			this.context.fillStyle = '#80ffff';
+			this.context.fillRect(this.canvas.width - 1, this.index, 1, 1);
+
+			this.context.fillStyle = '#00ffff';
+			this.context.fillRect(this.canvas.width - 1, this.index + 1, 1, 30 - this.index);
+
+			this.timePrev = this.time;
+			this.frames = 0;
+		}
+	}
+}