Phaser.ArrayUtils = { 
getRandomItem: function (objects, startIndex, length){ 
if (objects == null ) { 
return null ; 
} 
if (typeof startIndex === 'undefined') { 
startIndex = 0; 
} 
if (typeof length === 'undefined') { 
length = _AN_Read_length('length', objects); 
} 
var randomIndex = startIndex + Math.floor(Math.random() * length); 
return objects[randomIndex] === undefined? null : objects[randomIndex]; 
} 
,
removeRandomItem: function (objects, startIndex, length){ 
if (objects == null ) { 
return null ; 
} 
if (typeof startIndex === 'undefined') { 
startIndex = 0; 
} 
if (typeof length === 'undefined') { 
length = _AN_Read_length('length', objects); 
} 
var randomIndex = startIndex + Math.floor(Math.random() * length); 
if (randomIndex < _AN_Read_length('length', objects)) { 
var removed = objects.splice(randomIndex, 1); 
return removed[0] === undefined? null : removed[0]; 
} 
 else { 
return null ; 
} 
} 
,
shuffle: function (array){ 
for (var i = _AN_Read_length('length', array) - 1; 
i > 0; i-- ){ 
var j = Math.floor(Math.random() * (i + 1)); 
var temp = array[i]; 
array[i] = array[j]; 
array[j] = temp; 
} 
return array; 
} 
,
transposeMatrix: function (array){ 
var sourceRowCount = _AN_Read_length('length', array); 
var sourceColCount = _AN_Read_length('length', array[0]); 
var result = new Array(sourceColCount); 
for (var i = 0; 
i < sourceColCount; i++ ){ 
result[i] = new Array(sourceRowCount); 
for (var j = sourceRowCount - 1; 
j > -1; j-- ){ 
result[i][j] = array[j][i]; 
} 
} 
return result; 
} 
,
rotateMatrix: function (matrix, direction){ 
if (typeof direction !== 'string') { 
direction = ((direction % 360) + 360) % 360; 
} 
if (direction === 90 || direction === -270 || direction === 'rotateLeft') { 
matrix = Phaser.ArrayUtils.transposeMatrix(matrix); 
matrix = matrix.reverse(); 
} 
 else if (direction === -90 || direction === 270 || direction === 'rotateRight') { 
matrix = matrix.reverse(); 
matrix = Phaser.ArrayUtils.transposeMatrix(matrix); 
} 
 else if (Math.abs(direction) === 180 || direction === 'rotate180') { 
for (var i = 0; 
i < _AN_Read_length('length', matrix); i++ ){ 
matrix[i].reverse(); 
} 
matrix = matrix.reverse(); 
} 
return matrix; 
} 
,
findClosest: function (value, arr){ 
if (!_AN_Read_length('length', arr)) { 
return NaN; 
} 
 else if (_AN_Read_length('length', arr) === 1 || value < arr[0]) { 
return arr[0]; 
} 
var i = 1; 
while (arr[i] < value){ 
i++ ; 
} 
var low = arr[i - 1]; 
var high = (i < _AN_Read_length('length', arr))? arr[i]: Number.POSITIVE_INFINITY; 
return ((high - value) <= (value - low))? high: low; 
} 
,
rotate: function (array){ 
var s = array.shift(); 
array.push(s); 
return s; 
} 
,
numberArray: function (start, end){ 
var result = [] ; 
for (var i = start; 
i <= end; i++ ){ 
result.push(i); 
} 
return result; 
} 
,
numberArrayStep: function (start, end, step){ 
start = + start || 0; 
var type = typeof end; 
if ((type === 'number' || type === 'string') && step && step[end] === start) { 
end = step = null ; 
} 
step = step == null ? 1: (+ step || 0); 
if (end === null ) { 
end = start; 
start = 0; 
} 
 else { 
end = + end || 0; 
} 
var index = -1; 
var length = Math.max(Phaser.Math.roundAwayFromZero((end - start) / (step || 1)), 0); 
var result = new Array(length); 
while (++index < length){ 
result[index] = start; 
start += step; 
} 
return result; 
} 
}
;