From 30a434f78da99e40efbebac3584e4e7107e01445 Mon Sep 17 00:00:00 2001
From: Robert Kolner <robert.kolner@gmail.com>
Date: Wed, 28 Nov 2012 22:11:28 +0100
Subject: [PATCH] Working seeding of rng's.

---
 index.html        |  9 +++++----
 tetris-ai-test.js |  6 ++++--
 tetris.js         | 11 ++++++++++-
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/index.html b/index.html
index 0e7088c..4caf3e0 100644
--- a/index.html
+++ b/index.html
@@ -1,11 +1,12 @@
 <html>
 	<head>
+		<script src=http://davidbau.com/encode/seedrandom-min.js></script>
 		<script src="jquery-1.7.1.js"></script>
 		<script src="utils.js"></script>
 		<script src="tetris-stats.js"></script>
 		<script src="tetris-canvas.js"></script>
 		<script src="tetris.js"></script>
-		
+
 		<style>
 			body {
 				font-family: Courier, "Courier New", monospace;
@@ -64,15 +65,15 @@
 					var aiRight = QueryString.ai2;
 
 					include('tetris-ai-'+aiLeft+'.js');
-					include('tetris-ai-'+airight+'.js');
+					include('tetris-ai-'+aiRight+'.js');
 		</script>
 	</head>
 
 	<body>
 		<script>
 			window.onload = function() {
-				eval('new '+aiLeft+'("tetris-board-left")');
-				eval('new '+aiRight+'("tetris-board-right")');
+				eval('new '+aiLeft+'("tetris-board-left", 1337)');
+				eval('new '+aiRight+'("tetris-board-right", 1337)');
 			};
 		</script>
 
diff --git a/tetris-ai-test.js b/tetris-ai-test.js
index 5c323de..d4a664b 100644
--- a/tetris-ai-test.js
+++ b/tetris-ai-test.js
@@ -1,4 +1,6 @@
-function test(elementId) {
+function test(elementId, randomseed) {
+	if (typeof randomseed === 'undefined') randomseed = Math.floor(1337 * Math.random());
+
 	var ACTION_LEFT = 1;
 	var ACTION_RIGHT = 2;
 	var ACTION_ROTATE = 3;
@@ -90,7 +92,7 @@ function test(elementId) {
 	}
 	
 	this.init = function() {
-		this.game = new TetrisGame(elementId);
+		this.game = new TetrisGame(elementId, undefined, undefined, randomseed);
 		this.game.startGame();
 		this.startAI();
 	}
diff --git a/tetris.js b/tetris.js
index 4820a74..a75db4b 100644
--- a/tetris.js
+++ b/tetris.js
@@ -1,4 +1,7 @@
-function TetrisGame(canvasId, linesCounterId, nextBricksCanvasId) {
+function TetrisGame(canvasId, linesCounterId, nextBricksCanvasId, seed) {
+	if (typeof seed === 'undefined') seed = Math.floor(1337 * Math.random());
+	Math.seedrandom(seed);
+
 	/*********/
 	/* Enum: */
 	/*********/
@@ -47,6 +50,8 @@ function TetrisGame(canvasId, linesCounterId, nextBricksCanvasId) {
 	this.nextBrickArray = Array(5);
 	this.nextBrickArrayIndex = 0;
 	
+	this.rng = Math.random;
+
 	/**************/
 	/* Functions: */
 	/**************/
@@ -110,7 +115,11 @@ function TetrisGame(canvasId, linesCounterId, nextBricksCanvasId) {
 	}
 	
 	this.getRandomBrick = function() {
+		var oldRandom = Math.random;
+		Math.random = this.rng;
 		return 1 + Math.floor(Math.random() * 7);
+		this.rng = Math.random;
+		Math.random = oldRandom;
 	}
 
 	this.getNextBrick = function() {