phaser/docs/Math.js.html at 7b052c302fb2bc08749bbc41756227fa6020921b · ITCSsDeveloper/phaser · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<!DOCTYPE html>

<html lang="en">
<head>
	<meta charset="utf-8">
	<title>Phaser Source: math/Math.js</title>

	<!--[if lt IE 9]>
	<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
	<![endif]-->
	<link type="text/css" rel="stylesheet" href="styles/sunlight.default.css">


	<link type="text/css" rel="stylesheet" href="styles/site.cerulean.css">

</head>

<body>
<div class="container-fluid">
	<div class="navbar navbar-fixed-top navbar-inverse">
		<div class="navbar-inner">
			<a class="brand" href="index.html">Phaser</a>
			<ul class="nav">

				<li class="dropdown">
					<a href="namespaces.list.html" class="dropdown-toggle" data-toggle="dropdown">Namespaces<b
						class="caret"></b></a>

					<ul class="dropdown-menu ">

						<li>
							<a href="Phaser.html">Phaser</a>
						</li>


					</ul>
				</li>

				<li class="dropdown">
					<a href="classes.list.html" class="dropdown-toggle" data-toggle="dropdown">Classes<b
						class="caret"></b></a>

					<ul class="dropdown-menu ">

						<li>
							<a href="Phaser.Animation.html">Animation</a>
						</li>

						<li>
							<a href="Phaser.AnimationManager.html">AnimationManager</a>
						</li>

						<li>
							<a href="Phaser.AnimationParser.html">AnimationParser</a>
						</li>

						<li>
							<a href="Phaser.Cache.html">Cache</a>
						</li>

						<li>
							<a href="Phaser.Camera.html">Camera</a>
						</li>

						<li>
							<a href="Phaser.Canvas.html">Canvas</a>
						</li>

						<li>
							<a href="Phaser.Circle.html">Circle</a>
						</li>

						<li>
							<a href="Phaser.Color.html">Color</a>
						</li>

						<li>
							<a href="Phaser.Device.html">Device</a>
						</li>

						<li>
							<a href="Phaser.Easing.html">Easing</a>
						</li>

						<li>
							<a href="Phaser.Easing.Back.html">Back</a>
						</li>

						<li>
							<a href="Phaser.Easing.Bounce.html">Bounce</a>
						</li>

						<li>
							<a href="Phaser.Easing.Circular.html">Circular</a>
						</li>

						<li>
							<a href="Phaser.Easing.Cubic.html">Cubic</a>
						</li>

						<li>
							<a href="Phaser.Easing.Elastic.html">Elastic</a>
						</li>

						<li>
							<a href="Phaser.Easing.Exponential.html">Exponential</a>
						</li>

						<li>
							<a href="Phaser.Easing.Linear.html">Linear</a>
						</li>

						<li>
							<a href="Phaser.Easing.Quadratic.html">Quadratic</a>
						</li>

						<li>
							<a href="Phaser.Easing.Quartic.html">Quartic</a>
						</li>

						<li>
							<a href="Phaser.Easing.Quintic.html">Quintic</a>
						</li>

						<li>
							<a href="Phaser.Easing.Sinusoidal.html">Sinusoidal</a>
						</li>

						<li>
							<a href="Phaser.Frame.html">Frame</a>
						</li>

						<li>
							<a href="Phaser.FrameData.html">FrameData</a>
						</li>

						<li>
							<a href="Phaser.Game.html">Game</a>
						</li>

						<li>
							<a href="Phaser.Group.html">Group</a>
						</li>

						<li>
							<a href="Phaser.Input.html">Input</a>
						</li>

						<li>
							<a href="Phaser.InputHandler.html">InputHandler</a>
						</li>

						<li>
							<a href="Phaser.Key.html">Key</a>
						</li>

						<li>
							<a href="Phaser.Keyboard.html">Keyboard</a>
						</li>

						<li>
							<a href="Phaser.LinkedList.html">LinkedList</a>
						</li>

						<li>
							<a href="Phaser.Loader.html">Loader</a>
						</li>

						<li>
							<a href="Phaser.LoaderParser.html">LoaderParser</a>
						</li>

						<li>
							<a href="Phaser.Math.html">Math</a>
						</li>

						<li>
							<a href="Phaser.Mouse.html">Mouse</a>
						</li>

						<li>
							<a href="Phaser.MSPointer.html">MSPointer</a>
						</li>

						<li>
							<a href="Phaser.Net.html">Net</a>
						</li>

						<li>
							<a href="Phaser.Particles.html">Particles</a>
						</li>

						<li>
							<a href="Phaser.Particles.Arcade.Emitter.html">Emitter</a>
						</li>

						<li>
							<a href="Phaser.Plugin.html">Plugin</a>
						</li>

						<li>
							<a href="Phaser.PluginManager.html">PluginManager</a>
						</li>

						<li>
							<a href="Phaser.Point.html">Point</a>
						</li>

						<li>
							<a href="Phaser.Pointer.html">Pointer</a>
						</li>

						<li>
							<a href="Phaser.QuadTree.html">QuadTree</a>
						</li>

						<li>
							<a href="Phaser.RandomDataGenerator.html">RandomDataGenerator</a>
						</li>

						<li>
							<a href="Phaser.Rectangle.html">Rectangle</a>
						</li>

						<li>
							<a href="Phaser.RequestAnimationFrame.html">RequestAnimationFrame</a>
						</li>

						<li>
							<a href="Phaser.Signal.html">Signal</a>
						</li>

						<li>
							<a href="Phaser.Sound.html">Sound</a>
						</li>

						<li>
							<a href="Phaser.SoundManager.html">SoundManager</a>
						</li>

						<li>
							<a href="Phaser.Stage.html">Stage</a>
						</li>

						<li>
							<a href="Phaser.StageScaleMode.html">StageScaleMode</a>
						</li>

						<li>
							<a href="Phaser.State.html">State</a>
						</li>

						<li>
							<a href="Phaser.StateManager.html">StateManager</a>
						</li>

						<li>
							<a href="Phaser.Time.html">Time</a>
						</li>

						<li>
							<a href="Phaser.Touch.html">Touch</a>
						</li>

						<li>
							<a href="Phaser.Tween.html">Tween</a>
						</li>

						<li>
							<a href="Phaser.TweenManager.html">TweenManager</a>
						</li>

						<li>
							<a href="Phaser.Utils.html">Utils</a>
						</li>

						<li>
							<a href="Phaser.Utils.Debug.html">Debug</a>
						</li>

						<li>
							<a href="Phaser.World.html">World</a>
						</li>

						<li>
							<a href="SignalBinding.html">SignalBinding</a>
						</li>


					</ul>
				</li>

				<li class="dropdown">
					<a href="global.html" class="dropdown-toggle" data-toggle="dropdown">Global<b
						class="caret"></b></a>

					<ul class="dropdown-menu ">

						<li>
							<a href="global.html#HEXtoRGB">HEXtoRGB</a>
						</li>


					</ul>
				</li>

			</ul>
		</div>
	</div>

	<div class="row-fluid">


			<div class="span12">

				<div id="main">


		<h1 class="page-title">Source: math/Math.js</h1>

    <section>
        <article>
            <pre class="sunlight-highlight-javascript linenums">/**
* @author       Richard Davey &lt;rich@photonstorm.com>
* @copyright    2013 Photon Storm Ltd.
* @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/

/**
* A collection of mathematical methods.
*
* @class Phaser.Math
*/
Phaser.Math = {

	/**
	* = 2 &pi;
	* @method Phaser.Math#PI2
	*/
	PI2: Math.PI * 2,

	/**
	* Two number are fuzzyEqual if their difference is less than &epsilon;.
	* @method Phaser.Math#fuzzyEqual
	* @param {number} a
	* @param {number} b
	* @param {number} epsilon
	* @return {boolean} True if |a-b|&lt;&epsilon;
	*/
    fuzzyEqual: function (a, b, epsilon) {
        if (typeof epsilon === "undefined") { epsilon = 0.0001; }
        return Math.abs(a - b) &lt; epsilon;
    },

	/**
	* a is fuzzyLessThan b if it is less than b + &epsilon;.
	* @method Phaser.Math#fuzzyEqual
	* @param {number} a
	* @param {number} b
	* @param {number} epsilon
	* @return {boolean} True if a&lt;b+&epsilon;
	*/
    fuzzyLessThan: function (a, b, epsilon) {
        if (typeof epsilon === "undefined") { epsilon = 0.0001; }
        return a &lt; b + epsilon;
    },

	/**
	* a is fuzzyGreaterThan b if it is more than b - &epsilon;.
	* @method Phaser.Math#fuzzyGreaterThan
	* @param {number} a
	* @param {number} b
	* @param {number} epsilon
	* @return {boolean} True if a>b+&epsilon;
	*/
    fuzzyGreaterThan: function (a, b, epsilon) {
        if (typeof epsilon === "undefined") { epsilon = 0.0001; }
        return a > b - epsilon;
    },

	/**
	* @method Phaser.Math#fuzzyCeil
	* @param {number} val
	* @param {number} epsilon
	* @return {boolean} ceiling(val-&epsilon;)
	*/
    fuzzyCeil: function (val, epsilon) {
        if (typeof epsilon === "undefined") { epsilon = 0.0001; }
        return Math.ceil(val - epsilon);
    },

	/**
	* @method Phaser.Math#fuzzyFloor
	* @param {number} val
	* @param {number} epsilon
	* @return {boolean} floor(val-&epsilon;)
	*/
    fuzzyFloor: function (val, epsilon) {
        if (typeof epsilon === "undefined") { epsilon = 0.0001; }
        return Math.floor(val + epsilon);
    },

	/**
    * Averages all values passed to the function and returns the result. You can pass as many parameters as you like.
	* @method Phaser.Math#average
    * @return {number} The average of all given values.
	*/
    average: function () {

        var args = [];

        for (var _i = 0; _i &lt; (arguments.length - 0); _i++) {
            args[_i] = arguments[_i + 0];
        }

        var avg = 0;

        for (var i = 0; i &lt; args.length; i++) {
            avg += args[i];
        }

        return avg / args.length;

    },

	/**
	* @method Phaser.Math#truncate
    * @param {number} n
    * @return {number}
	*/
    truncate: function (n) {
        return (n > 0) ? Math.floor(n) : Math.ceil(n);
    },

	/**
	* @method Phaser.Math#shear
	* @param {number} n
	* @return {number} n mod 1
	*/
    shear: function (n) {
        return n % 1;
    },

	/**
	* Snap a value to nearest grid slice, using rounding.
	*
	* Example: if you have an interval gap of 5 and a position of 12... you will snap to 10 whereas 14 will snap to 15.
	*
	* @method Phaser.Math#snapTo
	* @param {number} input - The value to snap.
	* @param {number} gap - The interval gap of the grid.
	* @param {number} [start] - Optional starting offset for gap.
    * @return {number}
	*/
    snapTo: function (input, gap, start) {

        if (typeof start === "undefined") { start = 0; }

        if (gap == 0) {
            return input;
        }

        input -= start;
        input = gap * Math.round(input / gap);

        return start + input;

    },

	/**
    * Snap a value to nearest grid slice, using floor.
    *
    * Example: if you have an interval gap of 5 and a position of 12... you will snap to 10. As will 14 snap to 10... but 16 will snap to 15
    *
    * @method Phaser.Math#snapToFloor
    * @param {number} input - The value to snap.
    * @param {number} gap - The interval gap of the grid.
    * @param {number} [start] - Optional starting offset for gap.
    * @return {number}
    */
    snapToFloor: function (input, gap, start) {

        if (typeof start === "undefined") { start = 0; }

        if (gap == 0) {
            return input;
        }

        input -= start;
        input = gap * Math.floor(input / gap);

        return start + input;

    },

	/**
	* Snap a value to nearest grid slice, using ceil.
	*
	* Example: if you have an interval gap of 5 and a position of 12... you will snap to 15. As will 14 will snap to 15... but 16 will snap to 20.
	*
    * @method Phaser.Math#snapToCeil
    * @param {number} input - The value to snap.
    * @param {number} gap - The interval gap of the grid.
    * @param {number} [start] - Optional starting offset for gap.
    * @return {number}
	*/
    snapToCeil: function (input, gap, start) {

        if (typeof start === "undefined") { start = 0; }

        if (gap == 0) {
            return input;
        }

        input -= start;
        input = gap * Math.ceil(input / gap);

        return start + input;

    },


	/**
	* Snaps a value to the nearest value in an array.
	* @method Phaser.Math#snapToInArray
	* @param {number} input
	* @param {array} arr
	* @param {boolean} sort - True if the array needs to be sorted.
    * @return {number}
	*/
    snapToInArray: function (input, arr, sort) {

        if (typeof sort === "undefined") { sort = true; }

        if (sort) {
            arr.sort();
        }

        if (input &lt; arr[0]) {
            return arr[0];
        }

        var i = 1;

        while (arr[i] &lt; input) {
            i++;
        }

        var low = arr[i - 1];
        var high = (i &lt; arr.length) ? arr[i] : Number.POSITIVE_INFINITY;

        return ((high - input) &lt;= (input - low)) ? high : low;

    },

	/**
	* Round to some place comparative to a 'base', default is 10 for decimal place.
	*
	* 'place' is represented by the power applied to 'base' to get that place
	* e.g.
	* 2000/7 ~= 285.714285714285714285714 ~= (bin)100011101.1011011011011011
	*
	* roundTo(2000/7,3) == 0
	* roundTo(2000/7,2) == 300
	* roundTo(2000/7,1) == 290
	* roundTo(2000/7,0) == 286
	* roundTo(2000/7,-1) == 285.7
	* roundTo(2000/7,-2) == 285.71
	* roundTo(2000/7,-3) == 285.714
	* roundTo(2000/7,-4) == 285.7143
	* roundTo(2000/7,-5) == 285.71429
	*
	* roundTo(2000/7,3,2)  == 288       -- 100100000
	* roundTo(2000/7,2,2)  == 284       -- 100011100
	* roundTo(2000/7,1,2)  == 286       -- 100011110
	* roundTo(2000/7,0,2)  == 286       -- 100011110
	* roundTo(2000/7,-1,2) == 285.5     -- 100011101.1
	* roundTo(2000/7,-2,2) == 285.75    -- 100011101.11
	* roundTo(2000/7,-3,2) == 285.75    -- 100011101.11
	* roundTo(2000/7,-4,2) == 285.6875  -- 100011101.1011
	* roundTo(2000/7,-5,2) == 285.71875 -- 100011101.10111
	*
	* Note what occurs when we round to the 3rd space (8ths place), 100100000, this is to be assumed
	* because we are rounding 100011.1011011011011011 which rounds up.
	*
	* @method Phaser.Math#roundTo
	* @param {number} value - The value to round.
	* @param {number} place - The place to round to.
	* @param {number} base - The base to round in... default is 10 for decimal.
    * @return {number}
	*/
    roundTo: function (value, place, base) {

        if (typeof place === "undefined") { place = 0; }
        if (typeof base === "undefined") { base = 10; }

        var p = Math.pow(base, -place);

        return Math.round(value * p) / p;

    },

    /**
	* @method Phaser.Math#floorTo
	* @param {number} value - The value to round.
	* @param {number} place - The place to round to.
	* @param {number} base - The base to round in... default is 10 for decimal.
    * @return {number}
	*/
    floorTo: function (value, place, base) {

        if (typeof place === "undefined") { place = 0; }
        if (typeof base === "undefined") { base = 10; }

        var p = Math.pow(base, -place);

        return Math.floor(value * p) / p;

    },

    /**
	* @method Phaser.Math#ceilTo
	* @param {number} value - The value to round.
	* @param {number} place - The place to round to.
	* @param {number} base - The base to round in... default is 10 for decimal.
    * @return {number}
	*/
    ceilTo: function (value, place, base) {

        if (typeof place === "undefined") { place = 0; }
        if (typeof base === "undefined") { base = 10; }

        var p = Math.pow(base, -place);

        return Math.ceil(value * p) / p;

    },

	/**
	* A one dimensional linear interpolation of a value.
	* @method Phaser.Math#interpolateFloat
	* @param {number} a
	* @param {number} b
	* @param {number} weight
    * @return {number}
	*/
    interpolateFloat: function (a, b, weight) {
        return (b - a) * weight + a;
    },

	/**
	* Find the angle of a segment from (x1, y1) -> (x2, y2 ).
	* @method Phaser.Math#angleBetween
	* @param {number} x1
	* @param {number} y1
	* @param {number} x2
	* @param {number} y2
    * @return {number}
	*/
    angleBetween: function (x1, y1, x2, y2) {
        return Math.atan2(y2 - y1, x2 - x1);
    },

	/**
	* Set an angle  within the bounds of -&pi; to&pi;.
	* @method Phaser.Math#normalizeAngle
	* @param {number} angle
	* @param {boolean} radians - True if angle size is expressed in radians.
    * @return {number}
	*/
    normalizeAngle: function (angle, radians) {

        if (typeof radians === "undefined") { radians = true; }

        var rd = (radians) ? GameMath.PI : 180;
        return this.wrap(angle, rd, -rd);

    },

	/**
	* Closest angle between two angles from a1 to a2
	* absolute value the return for exact angle
	* @method Phaser.Math#nearestAngleBetween
	* @param {number} a1
	* @param {number} a2
	* @param {boolean} radians - True if angle sizes are expressed in radians.
    * @return {number}
	*/
    nearestAngleBetween: function (a1, a2, radians) {

        if (typeof radians === "undefined") { radians = true; }

        var rd = (radians) ? Math.PI : 180;
        a1 = this.normalizeAngle(a1, radians);
        a2 = this.normalizeAngle(a2, radians);

        if (a1 &lt; -rd / 2 && a2 > rd / 2)
        {
            a1 += rd * 2;
        }

        if (a2 &lt; -rd / 2 && a1 > rd / 2)
        {
            a2 += rd * 2;
        }

        return a2 - a1;

    },

	/**
	* Interpolate across the shortest arc between two angles.
	* @method Phaser.Math#interpolateAngles
	* @param {number} a1 - Description.
	* @param {number} a2 - Description.
	* @param {number} weight - Description.
	* @param {boolean} radians - True if angle sizes are expressed in radians.
	* @param {Description} ease - Description.
    * @return {number}
	*/
    interpolateAngles: function (a1, a2, weight, radians, ease) {

        if (typeof radians === "undefined") { radians = true; }
        if (typeof ease === "undefined") { ease = null; }

        a1 = this.normalizeAngle(a1, radians);
        a2 = this.normalizeAngleToAnother(a2, a1, radians);

        return (typeof ease === 'function') ? ease(weight, a1, a2 - a1, 1) : this.interpolateFloat(a1, a2, weight);

    },

	/**
	* Generate a random bool result based on the chance value.
	* &lt;p>
	* Returns true or false based on the chance value (default 50%). For example if you wanted a player to have a 30% chance
	* of getting a bonus, call chanceRoll(30) - true means the chance passed, false means it failed.
	* &lt;/p>
	* @method Phaser.Math#chanceRoll
	* @param {number} chance - The chance of receiving the value. A number between 0 and 100 (effectively 0% to 100%).
	* @return {boolean} True if the roll passed, or false otherwise.
	*/
    chanceRoll: function (chance) {

        if (typeof chance === "undefined") { chance = 50; }

        if (chance &lt;= 0)
        {
            return false;
        }
        else if (chance >= 100)
        {
            return true;
        }
        else
        {
            if (Math.random() * 100 >= chance)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

    },

    /**
    * Returns an Array containing the numbers from min to max (inclusive).
    *
    * @method Phaser.Math#numberArray
    * @param {number} min - The minimum value the array starts with.
    * @param {number} max - The maximum value the array contains.
    * @return {array} The array of number values.
    */
    numberArray: function (min, max) {

        var result = [];

        for (var i = min; i &lt;= max; i++)
        {
            result.push(i);
        }

        return result;

    },

	/**
	* Adds the given amount to the value, but never lets the value go over the specified maximum.
	*
	* @method Phaser.Math#maxAdd
	* @param {number} value - The value to add the amount to.
	* @param {number} amount - The amount to add to the value.
	* @param {number} max- The maximum the value is allowed to be.
    * @return {number}
	*/
    maxAdd: function (value, amount, max) {

        value += amount;

        if (value > max)
        {
            value = max;
        }

        return value;

    },

	/**
	* Subtracts the given amount from the value, but never lets the value go below the specified minimum.
	*
	* @method Phaser.Math#minSub
	* @param {number} value - The base value.
	* @param {number} amount - The amount to subtract from the base value.
	* @param {number} min - The minimum the value is allowed to be.
	* @return {number} The new value.
	*/
    minSub: function (value, amount, min) {

        value -= amount;

        if (value &lt; min)
        {
            value = min;
        }

        return value;

    },

    /**
    * Ensures that the value always stays between min and max, by wrapping the value around.
    * &lt;p>max should be larger than min, or the function will return 0&lt;/p>
    *
    * @method Phaser.Math#wrap
    * @param value The value to wrap
    * @param min The minimum the value is allowed to be
    * @param max The maximum the value is allowed to be
    * @return {number} The wrapped value
    */
    wrap: function (value, min, max) {

        var range = max - min;

        if (range &lt;= 0)
        {
            return 0;
        }

        var result = (value - min) % range;

        if (result &lt; 0)
        {
            result += range;
        }

        return result + min;

    },

    /**
    * Adds value to amount and ensures that the result always stays between 0 and max, by wrapping the value around.
    * &lt;p>Values must be positive integers, and are passed through Math.abs&lt;/p>
    *
	* @method Phaser.Math#wrapValue
	* @param {number} value - The value to add the amount to.
	* @param {number} amount - The amount to add to the value.
	* @param {number} max - The maximum the value is allowed to be.
	* @return {number} The wrapped value.
    */
    wrapValue: function (value, amount, max) {

        var diff;
        value = Math.abs(value);
        amount = Math.abs(amount);
        max = Math.abs(max);
        diff = (value + amount) % max;

        return diff;

    },

	/**
	* Randomly returns either a 1 or -1.
	*
	* @method Phaser.Math#randomSign
	* @return {number}	1 or -1
	*/
    randomSign: function () {
        return (Math.random() > 0.5) ? 1 : -1;
    },

	/**
	* Returns true if the number given is odd.
	*
	* @method Phaser.Math#isOdd
	* @param {number} n - The number to check.
	* @return {boolean} True if the given number is odd. False if the given number is even.
	*/
    isOdd: function (n) {

        return (n & 1);

    },

	/**
	* Returns true if the number given is even.
	*
	* @method Phaser.Math#isEven
	* @param {number} n - The number to check.
	* @return {boolean} True if the given number is even. False if the given number is odd.
	*/
    isEven: function (n) {

        if (n & 1)
        {
            return false;
        }
        else
        {
            return true;
        }

    },

    /**
    * Significantly faster version of Math.max
    * See http://jsperf.com/math-s-min-max-vs-homemade/5
    *
    * @method Phaser.Math#max
    * @return {number} The highest value from those given.
    */
    max: function () {

        for (var i = 1, max = 0, len = arguments.length; i &lt; len; i++)
        {
            if (arguments[max] &lt; arguments[i])
            {
                max = i;
            }
        }

        return arguments[max];

    },

    /**
    * Significantly faster version of Math.min
    * See http://jsperf.com/math-s-min-max-vs-homemade/5
    *
    * @method Phaser.Math#min
    * @return {number} The lowest value from those given.
    */
    min: function () {

        for (var i =1 , min = 0, len = arguments.length; i &lt; len; i++)
        {
            if (arguments[i] &lt; arguments[min])
            {
                min = i;
            }
        }

        return arguments[min];

    },

	/**
	* Keeps an angle value between -180 and +180&lt;br>
	* Should be called whenever the angle is updated on the Sprite to stop it from going insane.
	*
	* @method Phaser.Math#wrapAngle
	* @param {number} angle - The angle value to check
	* @return {number} The new angle value, returns the same as the input angle if it was within bounds.
	*/
    wrapAngle: function (angle) {

        var result = angle;

        //  Nothing needs to change
        if (angle >= -180 && angle &lt;= 180)
        {
            return angle;
        }

        //  Else normalise it to -180, 180
        result = (angle + 180) % 360;

        if (result &lt; 0)
        {
            result += 360;
        }

        return result - 180;

    },