/**
 * @namespace Top-level ROT namespace
 */
var ROT = {
	/**
	 * @returns {bool} Is rot.js supported by this browser?
	 */
	isSupported: function() {
		return !!(document.createElement("canvas").getContext && Function.prototype.bind);
	},

	/** Default with for display and map generators */
	DEFAULT_WIDTH: 80,
	/** Default height for display and map generators */
	DEFAULT_HEIGHT: 25,

	/** Directional constants. Ordering is important! */
	DIRS: {
		"4": [
			[ 0, -1],
			[ 1,  0],
			[ 0,  1],
			[-1,  0]
		],
		"8": [
			[ 0, -1],
			[ 1, -1],
			[ 1,  0],
			[ 1,  1],
			[ 0,  1],
			[-1,  1],
			[-1,  0],
			[-1, -1]
		],
		"6": [
			[-1, -1],
			[ 1, -1],
			[ 2,  0],
			[ 1,  1],
			[-1,  1],
			[-2,  0]
		]
	},

	/** Cancel key. */
	VK_CANCEL: 3, 
	/** Help key. */
	VK_HELP: 6, 
	/** Backspace key. */
	VK_BACK_SPACE: 8, 
	/** Tab key. */
	VK_TAB: 9, 
	/** 5 key on Numpad when NumLock is unlocked. Or on Mac, clear key which is positioned at NumLock key. */
	VK_CLEAR: 12, 
	/** Return/enter key on the main keyboard. */
	VK_RETURN: 13, 
	/** Reserved, but not used. */
	VK_ENTER: 14, 
	/** Shift key. */
	VK_SHIFT: 16, 
	/** Control key. */
	VK_CONTROL: 17, 
	/** Alt (Option on Mac) key. */
	VK_ALT: 18, 
	/** Pause key. */
	VK_PAUSE: 19, 
	/** Caps lock. */
	VK_CAPS_LOCK: 20, 
	/** Escape key. */
	VK_ESCAPE: 27, 
	/** Space bar. */
	VK_SPACE: 32, 
	/** Page Up key. */
	VK_PAGE_UP: 33, 
	/** Page Down key. */
	VK_PAGE_DOWN: 34, 
	/** End key. */
	VK_END: 35, 
	/** Home key. */
	VK_HOME: 36, 
	/** Left arrow. */
	VK_LEFT: 37, 
	/** Up arrow. */
	VK_UP: 38, 
	/** Right arrow. */
	VK_RIGHT: 39, 
	/** Down arrow. */
	VK_DOWN: 40, 
	/** Print Screen key. */
	VK_PRINTSCREEN: 44, 
	/** Ins(ert) key. */
	VK_INSERT: 45, 
	/** Del(ete) key. */
	VK_DELETE: 46, 
	/***/
	VK_0: 48,
	/***/
	VK_1: 49,
	/***/
	VK_2: 50,
	/***/
	VK_3: 51,
	/***/
	VK_4: 52,
	/***/
	VK_5: 53,
	/***/
	VK_6: 54,
	/***/
	VK_7: 55,
	/***/
	VK_8: 56,
	/***/
	VK_9: 57,
	/** Colon (:) key. Requires Gecko 15.0 */
	VK_COLON: 58, 
	/** Semicolon (;) key. */
	VK_SEMICOLON: 59, 
	/** Less-than (<) key. Requires Gecko 15.0 */
	VK_LESS_THAN: 60, 
	/** Equals (=) key. */
	VK_EQUALS: 61, 
	/** Greater-than (>) key. Requires Gecko 15.0 */
	VK_GREATER_THAN: 62, 
	/** Question mark (?) key. Requires Gecko 15.0 */
	VK_QUESTION_MARK: 63, 
	/** Atmark (@) key. Requires Gecko 15.0 */
	VK_AT: 64, 
	/***/
	VK_A: 65,
	/***/
	VK_B: 66,
	/***/
	VK_C: 67,
	/***/
	VK_D: 68,
	/***/
	VK_E: 69,
	/***/
	VK_F: 70,
	/***/
	VK_G: 71,
	/***/
	VK_H: 72,
	/***/
	VK_I: 73,
	/***/
	VK_J: 74,
	/***/
	VK_K: 75,
	/***/
	VK_L: 76,
	/***/
	VK_M: 77,
	/***/
	VK_N: 78,
	/***/
	VK_O: 79,
	/***/
	VK_P: 80,
	/***/
	VK_Q: 81,
	/***/
	VK_R: 82,
	/***/
	VK_S: 83,
	/***/
	VK_T: 84,
	/***/
	VK_U: 85,
	/***/
	VK_V: 86,
	/***/
	VK_W: 87,
	/***/
	VK_X: 88,
	/***/
	VK_Y: 89,
	/***/
	VK_Z: 90,
	/***/
	VK_CONTEXT_MENU: 93,
	/** 0 on the numeric keypad. */
	VK_NUMPAD0: 96, 
	/** 1 on the numeric keypad. */
	VK_NUMPAD1: 97, 
	/** 2 on the numeric keypad. */
	VK_NUMPAD2: 98, 
	/** 3 on the numeric keypad. */
	VK_NUMPAD3: 99, 
	/** 4 on the numeric keypad. */
	VK_NUMPAD4: 100, 
	/** 5 on the numeric keypad. */
	VK_NUMPAD5: 101, 
	/** 6 on the numeric keypad. */
	VK_NUMPAD6: 102, 
	/** 7 on the numeric keypad. */
	VK_NUMPAD7: 103, 
	/** 8 on the numeric keypad. */
	VK_NUMPAD8: 104, 
	/** 9 on the numeric keypad. */
	VK_NUMPAD9: 105, 
	/** * on the numeric keypad. */
	VK_MULTIPLY: 106,
	/** + on the numeric keypad. */
	VK_ADD: 107, 
	/***/
	VK_SEPARATOR: 108,
	/** - on the numeric keypad. */
	VK_SUBTRACT: 109, 
	/** Decimal point on the numeric keypad. */
	VK_DECIMAL: 110, 
	/** / on the numeric keypad. */
	VK_DIVIDE: 111, 
	/** F1 key. */
	VK_F1: 112, 
	/** F2 key. */
	VK_F2: 113, 
	/** F3 key. */
	VK_F3: 114, 
	/** F4 key. */
	VK_F4: 115, 
	/** F5 key. */
	VK_F5: 116, 
	/** F6 key. */
	VK_F6: 117, 
	/** F7 key. */
	VK_F7: 118, 
	/** F8 key. */
	VK_F8: 119, 
	/** F9 key. */
	VK_F9: 120, 
	/** F10 key. */
	VK_F10: 121, 
	/** F11 key. */
	VK_F11: 122, 
	/** F12 key. */
	VK_F12: 123, 
	/** F13 key. */
	VK_F13: 124, 
	/** F14 key. */
	VK_F14: 125, 
	/** F15 key. */
	VK_F15: 126, 
	/** F16 key. */
	VK_F16: 127, 
	/** F17 key. */
	VK_F17: 128, 
	/** F18 key. */
	VK_F18: 129, 
	/** F19 key. */
	VK_F19: 130, 
	/** F20 key. */
	VK_F20: 131, 
	/** F21 key. */
	VK_F21: 132, 
	/** F22 key. */
	VK_F22: 133, 
	/** F23 key. */
	VK_F23: 134, 
	/** F24 key. */
	VK_F24: 135, 
	/** Num Lock key. */
	VK_NUM_LOCK: 144, 
	/** Scroll Lock key. */
	VK_SCROLL_LOCK: 145, 
	/** Circumflex (^) key. Requires Gecko 15.0 */
	VK_CIRCUMFLEX: 160, 
	/** Exclamation (!) key. Requires Gecko 15.0 */
	VK_EXCLAMATION: 161, 
	/** Double quote () key. Requires Gecko 15.0 */
	VK_DOUBLE_QUOTE: 162, 
	/** Hash (#) key. Requires Gecko 15.0 */
	VK_HASH: 163, 
	/** Dollar sign ($) key. Requires Gecko 15.0 */
	VK_DOLLAR: 164, 
	/** Percent (%) key. Requires Gecko 15.0 */
	VK_PERCENT: 165, 
	/** Ampersand (&) key. Requires Gecko 15.0 */
	VK_AMPERSAND: 166, 
	/** Underscore (_) key. Requires Gecko 15.0 */
	VK_UNDERSCORE: 167, 
	/** Open parenthesis (() key. Requires Gecko 15.0 */
	VK_OPEN_PAREN: 168, 
	/** Close parenthesis ()) key. Requires Gecko 15.0 */
	VK_CLOSE_PAREN: 169, 
	/* Asterisk (*) key. Requires Gecko 15.0 */
	VK_ASTERISK: 170,
	/** Plus (+) key. Requires Gecko 15.0 */
	VK_PLUS: 171, 
	/** Pipe (|) key. Requires Gecko 15.0 */
	VK_PIPE: 172, 
	/** Hyphen-US/docs/Minus (-) key. Requires Gecko 15.0 */
	VK_HYPHEN_MINUS: 173, 
	/** Open curly bracket ({) key. Requires Gecko 15.0 */
	VK_OPEN_CURLY_BRACKET: 174, 
	/** Close curly bracket (}) key. Requires Gecko 15.0 */
	VK_CLOSE_CURLY_BRACKET: 175, 
	/** Tilde (~) key. Requires Gecko 15.0 */
	VK_TILDE: 176, 
	/** Comma (,) key. */
	VK_COMMA: 188, 
	/** Period (.) key. */
	VK_PERIOD: 190, 
	/** Slash (/) key. */
	VK_SLASH: 191, 
	/** Back tick (`) key. */
	VK_BACK_QUOTE: 192, 
	/** Open square bracket ([) key. */
	VK_OPEN_BRACKET: 219, 
	/** Back slash (\) key. */
	VK_BACK_SLASH: 220, 
	/** Close square bracket (]) key. */
	VK_CLOSE_BRACKET: 221, 
	/** Quote (''') key. */
	VK_QUOTE: 222, 
	/** Meta key on Linux, Command key on Mac. */
	VK_META: 224, 
	/** AltGr key on Linux. Requires Gecko 15.0 */
	VK_ALTGR: 225, 
	/** Windows logo key on Windows. Or Super or Hyper key on Linux. Requires Gecko 15.0 */
	VK_WIN: 91, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_KANA: 21, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_HANGUL: 21, 
	/** 英数 key on Japanese Mac keyboard. Requires Gecko 15.0 */
	VK_EISU: 22, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_JUNJA: 23, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_FINAL: 24, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_HANJA: 25, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_KANJI: 25, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_CONVERT: 28, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_NONCONVERT: 29, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_ACCEPT: 30, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_MODECHANGE: 31, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_SELECT: 41, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_PRINT: 42, 
	/** Linux support for this keycode was added in Gecko 4.0. */
	VK_EXECUTE: 43, 
	/** Linux support for this keycode was added in Gecko 4.0.	 */
	VK_SLEEP: 95 
};