Hacky gamepad controls for Dungeon Decorator

gamepadcontrols.js

var gamepadPoller = -1;
function pollGamepad() {
    var gamepads = navigator.getGamepads();
    // Use input from any gamepad.
    for (var i=0; i<gamepads.length; i++) {
        if (gamepads[i]) {
            var g = gamepads[i];
            // Use any button for jump.
            keyPressed[32] = Array.prototype.some.call(g.buttons, function(b) {return b.pressed; });
            // Assume axis 0 is left/right, 1 is up/down. Not 100% reliable!
            var DEADZONE = 0.25;
            keyPressed[left] = g.axes[0] < -DEADZONE;
            keyPressed[right] = g.axes[0] > DEADZONE;
            keyPressed[up] = g.axes[1] < -DEADZONE;
            keyPressed[down] = g.axes[1] > DEADZONE;
        }
    }
}
addEventListener("gamepadconnected", function() {
    console.log('gamepad connected');
    if (gamepadPoller == -1)
        gamepadPoller = setInterval(pollGamepad, 15);
});
addEventListener("gamepaddisconnected", function() {
    console.log('gamepad disconnected');
    if (gamepadPoller != -1 && !Array.prototype.some.call(navigator.getGamepads(), function(g) {return g != undefined; })) {
        clearInterval(gamepadPoller);
        gamepadPoller = -1;
    }
});