From 69f7c0c69338a966841b3ecd4bd97df00bf28dbb Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Mon, 12 Aug 2013 22:42:14 -0400
Subject: [PATCH] updates to mathjax plugin, incl more examples #531

---
 examples/math.html  | 38 ++++++++++++++++++++++++++++++++------
 plugin/math/math.js | 13 ++++++++++++-
 2 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/examples/math.html b/examples/math.html
index 49d4952..67fa546 100644
--- a/examples/math.html
+++ b/examples/math.html
@@ -15,7 +15,7 @@
 		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
 
 		<link rel="stylesheet" href="../css/reveal.min.css">
-		<link rel="stylesheet" href="../css/theme/default.css" id="theme">
+		<link rel="stylesheet" href="../css/theme/night.css" id="theme">
 
 		<!-- For syntax highlighting -->
 		<link rel="stylesheet" href="../lib/css/zenburn.css">
@@ -32,11 +32,12 @@
 			<div class="slides">
 
 				<section>
-					<h1>Reveal.js Math Plugin</h1>
+					<h2>reveal.js Math Plugin</h2>
+					<p>A thin wrapper for MathJax</p>
 				</section>
 
 				<section>
-					<h2>The Lorenz Equations</h2>
+					<h3>The Lorenz Equations</h3>
 					\[\begin{aligned}
 					\dot{x} &amp; = \sigma(y-x) \\
 					\dot{y} &amp; = \rho x - y - xz \\
@@ -45,13 +46,13 @@
 				</section>
 
 				<section>
-					<h2>The Cauchy-Schwarz Inequality</h2>
+					<h3>The Cauchy-Schwarz Inequality</h3>
 
 					\[ \left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right) \]
 				</section>
 
 				<section>
-					<h2>A Cross Product Formula</h2>
+					<h3>A Cross Product Formula</h3>
 
 					\[\mathbf{V}_1 \times \mathbf{V}_2 =  \begin{vmatrix}
 					\mathbf{i} &amp; \mathbf{j} &amp; \mathbf{k} \\
@@ -61,13 +62,36 @@
 				</section>
 
 				<section>
-					<h2>An Identity of Ramanujan</h2>
+					<h3>The probability of getting \(k\) heads when flipping \(n\) coins is</h3>
+
+					\[P(E)   = {n \choose k} p^k (1-p)^{ n-k} \]
+				</section>
+
+				<section>
+					<h3>An Identity of Ramanujan</h3>
 
 					\[ \frac{1}{\Bigl(\sqrt{\phi \sqrt{5}}-\phi\Bigr) e^{\frac25 \pi}} =
 					1+\frac{e^{-2\pi}} {1+\frac{e^{-4\pi}} {1+\frac{e^{-6\pi}}
 					{1+\frac{e^{-8\pi}} {1+\ldots} } } } \]
 				</section>
 
+				<section>
+					<h3>A Rogers-Ramanujan Identity</h3>
+
+					\[  1 +  \frac{q^2}{(1-q)}+\frac{q^6}{(1-q)(1-q^2)}+\cdots =
+					\prod_{j=0}^{\infty}\frac{1}{(1-q^{5j+2})(1-q^{5j+3})}\]
+				</section>
+
+				<section>
+					<h3>Maxwell&#8217;s Equations</h3>
+
+					\[  \begin{aligned}
+					\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} &amp; = \frac{4\pi}{c}\vec{\mathbf{j}} \\   \nabla \cdot \vec{\mathbf{E}} &amp; = 4 \pi \rho \\
+					\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} &amp; = \vec{\mathbf{0}} \\
+					\nabla \cdot \vec{\mathbf{B}} &amp; = 0 \end{aligned}
+					\]
+				</section>
+
 			</div>
 
 		</div>
@@ -78,6 +102,8 @@
 		<script>
 
 			Reveal.initialize({
+				transition: 'linear',
+
 				dependencies: [
 					{ src: '../lib/js/classList.js', condition: function() { return !document.body.classList; } },
 					{ src: '../plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
diff --git a/plugin/math/math.js b/plugin/math/math.js
index 30dd38c..8ab74fa 100755
--- a/plugin/math/math.js
+++ b/plugin/math/math.js
@@ -6,10 +6,13 @@
  */
 (function(){
 
+	var config = Reveal.getConfig().math || {};
+	config.mode = config.mode || 'TeX-AMS_HTML-full';
+
 	var head = document.querySelector( 'head' );
 	var script = document.createElement( 'script' );
 	script.type = 'text/javascript';
-	script.src = 'http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_SVG-full';
+	script.src = 'http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=' + config.mode;
 
 	// Detect when the script has loaded
 	script.onload = onScriptLoad;
@@ -28,8 +31,16 @@
 			tex2jax: { inlineMath: [['$','$'],['\\(','\\)']] }
 		});
 
+		// Process any math inside of the current slide when navigating,
+		// this is important since it's not possible to typeset
+		// equations within invisible elements (far future or past).
 		Reveal.addEventListener( 'slidechanged', function( event ) {
+
+			// This will only typeset equations that have not yet been
+			// processed, as well as equations that have change since
+			// last being processed.
 			MathJax.Hub.Update( event.currentSlide );
+
 		} );
 
 	}