From d8d17f6702adbceb9d79348d3d94278a304b0646 Mon Sep 17 00:00:00 2001
From: Robert Kolner <robert.kolner@gmail.com>
Date: Fri, 23 Nov 2012 09:34:56 +0100
Subject: [PATCH] Massive speed improvments by ditching jQuery and DIY.

---
 tetris-ai-robertko.js | 10 ++++++++--
 utils.js              | 10 ++++++++++
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/tetris-ai-robertko.js b/tetris-ai-robertko.js
index 2806d6f..5517962 100644
--- a/tetris-ai-robertko.js
+++ b/tetris-ai-robertko.js
@@ -18,7 +18,7 @@ var mod_rank_shaft_ibonus = 0;
 var mod_rank_horizontal   = 1.5;
 
 var settings_level_depth     = 1;
-var settings_level_precision = 20;
+var settings_level_precision = 50;
 
 var bestDropLocation = null;
  
@@ -237,7 +237,10 @@ function chooseBestRank(brickId, board, dropLocations, level) {
 	var ranking = [];
 
 	for (var i = 0; i < dropLocations.length; i++) {
-		var tempBoard = $.extend(true, [], board);
+		//var tempBoard = $.extend(true, [], board);
+		var tempBoard = createArray(game.width, game.height);
+		copyArray(board, tempBoard);
+
 		var shape = game.brickShape(brickId, dropLocations[i][2]);
 	
 		// prepare tempBoard:
@@ -265,6 +268,9 @@ function chooseBestRank(brickId, board, dropLocations, level) {
 	
 		ranking.push([i, rank, tempBoard]);
 	}
+	if (ranking.length == 0) {
+		return [-1, -100000];
+	}
 
 	ranking.sort(function(a,b) {
 		return b[1] - a[1];
diff --git a/utils.js b/utils.js
index d8771b3..964f628 100644
--- a/utils.js
+++ b/utils.js
@@ -11,6 +11,16 @@ function createArray(length) {
     return a;
 }
 
+function copyArray(from, to) {
+	for (var i = 0; i < to.length; i++) {
+		for (var j = 0; j < to[i].length; j++) {
+			to[i][j] = from[i][j];
+		}
+	}
+
+	return;
+}
+
 function arrayContains(array, element) {
 	for (var i = 0; i < array.length; i++) {
 		if (array[i] == element) {