function addKeyListeners() {
    keypress.register_combo({
        keys: "left",
        on_keydown: function() {
            if (MainHex && gameState !== 0) {
                MainHex.rotate(1);
            }
        }
    });

    keypress.register_combo({
        keys: "right",
        on_keydown: function() {
            if (MainHex && gameState !== 0){
                MainHex.rotate(-1);
            }
        }
    });
    keypress.register_combo({
        keys: "down",
        on_keydown: function() {
                rush=2;
        },
        on_release: function() {
                rush=1;
        }

    });

    keypress.register_combo({
        keys: "a",
        on_keydown: function() {
            if (MainHex && gameState !== 0) {
                MainHex.rotate(1);
            }
        }
    });

    keypress.register_combo({
        keys: "d",
        on_keydown: function() {
            if (MainHex && gameState !== 0){
                MainHex.rotate(-1);
            }
        }
    });

    keypress.register_combo({
        keys: "p",
        on_keydown: function(){pause();}
    });

    keypress.register_combo({
        keys: "space",
        on_keydown: function(){pause();}
    });

    keypress.register_combo({
        keys: "q",
        on_keydown: function() {
            if (devMode) toggleDevTools();
        }
    });

    keypress.register_combo({
        keys: "enter",
        on_keydown: function() {
            if (gameState==2 || gameState==1 || importing == 1) {
                init(1);
            }
            if (gameState===0) {
                resumeGame();
            }
        }
    });

	$("#pauseBtn").on('touchstart mousedown', function() {
		if (gameState != 1 && gameState != -1) {
			return;
		}

		if ($('#helpScreen').is(":visible")) {
			$('#helpScreen').fadeOut(150, "linear");
		}

		pause();
		return false;
	});

	$("#colorBlindBtn").on('touchstart mousedown', function() {
	window.colors = ["#8e44ad", "#f1c40f", "#3498db", "#d35400"];

    window.hexColorsToTintedColors = {
        "#8e44ad": "rgb(229,152,102)",
        "#f1c40f": "rgb(246,223,133)",
        "#3498db": "rgb(151,201,235)",
        "#d35400": "rgb(210,180,222)"
    };

    window.rgbToHex = {
        "rgb(142,68,173)": "#8e44ad",
        "rgb(241,196,15)": "#f1c40f",
        "rgb(52,152,219)": "#3498db",
        "rgb(211,84,0)": "#d35400"
    };

    window.rgbColorsToTintedColors = {
        "rgb(142,68,173)": "rgb(229,152,102)",
        "rgb(241,196,15)": "rgb(246,223,133)",
        "rgb(52,152,219)": "rgb(151,201,235)",
        "rgb(46,204,113)": "rgb(210,180,222)"
	};
	});


    if(/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)) {
        $("#restartBtn").on('touchstart', function() {
            init(1);
            canRestart = false;
        });
    }
    else {
        $("#restartBtn").on('mousedown', function() {
            init(1);
            canRestart = false;
        });
    }
}
function inside (point, vs) {
    // ray-casting algorithm based on
    // http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
    
    var x = point[0], y = point[1];
    
    var inside = false;
    for (var i = 0, j = vs.length - 1; i < vs.length; j = i++) {
        var xi = vs[i][0], yi = vs[i][1];
        var xj = vs[j][0], yj = vs[j][1];
        
        var intersect = ((yi > y) != (yj > y))
            && (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
        if (intersect) inside = !inside;
    }
    
    return inside;
};

function handleClickTap(x,y) {
    if (x < 120 && y < 50 && $('.helpText').is(':visible')) {
        showHelp();
        return;
    }
    var radius = settings.hexWidth ;
    var halfRadius = radius/2;
    var triHeight = radius *(Math.sqrt(3)/2);
    var Vertexes =[
        [radius,0],
        [halfRadius,-triHeight],
        [-halfRadius,-triHeight],
        [-radius,0],
        [-halfRadius,triHeight],
        [halfRadius,triHeight]];
    Vertexes = Vertexes.map(function(coord){ 
        return [coord[0] + trueCanvas.width/2, coord[1] + trueCanvas.height/2]});
    if (gameState == 1 && inside([x,y],Vertexes)){
        toggleRush();
        return;
    }
    if (gameState == 2 && canRestart) {
        setTimeout(function() {
            if(tweetblock) {
                tweetblock = false;
                return;
            }
            else{
                if (gameState != 1) {
                    init(1);
                }
            }
            return;
        }, 1000);
        return;
    }

    if (!MainHex || gameState === 0 || gameState==-1) {
        return;
    }

    if (x < window.innerWidth/2) {
        if (gameState != 1 && gameState != -2 && gameState != -1 ){
            if (importing === 0) {
                resumeGame();
            }
            else {
                init(1);
            }
        }

        MainHex.rotate(1);
    }
    if (x > window.innerWidth/2) {
        if (gameState != 1 && gameState != -2 && gameState != -1) {
            if (importing === 0) {
                resumeGame();
            }
            else {
                init(1);
            }
        }
        MainHex.rotate(-1);
    }
}

function toggleRush(){
    rush = ((rush)%2)+1;
}
function setRush() {
    rush = 2;
}

function removeRush() {
    rush = 1;
}