Ableton Push Snake Game

ableton-push-snake.js

// Thank you git-moss for your Push4Bitwig script, as this was greatly helpful in learning how to
// control the LEDs/respond to input from the push. https://github.com/git-moss/Push4Bitwig

loadAPI(1);
load('Helpers.js');

host.defineController('WobbleSoft', 'Snake', '1.0', 'ebef3e20-6967-11e4-9803-0800200c9a66');
host.defineMidiPorts(1, 1);
host.addDeviceNameBasedDiscoveryPair (['Ableton Push User Port'], ['Ableton Push User Port']);

// sysex_live_mode = '\xF0\x47\x7F\x15\x62\x00\x01\x00\xF7'
// sysex_user_mode = '\xF0\x47\x7F\x15\x62\x00\x01\x01\xF7'

const SysexSetUserMode = "F0 47 7F 15 62 00 01 01 F7";
const UP = 1;
const DOWN = 2;
const RIGHT = 3;
const LEFT = 4;
const GAME_INTERVAL = 100;

const debugMIDI = false;

var snakeX = [];
var snakeY = [];
var pDirection = RIGHT;
var gamePaused = false;
var colorOffset = 0;

var eggX = 5; var eggY = 3;

function snakeContainsEgg()
{
	for (var i = 0; i < snakeX.length; i++)
	{
		if (snakeX[i] == eggX && snakeY[i] == eggY)
			return true;
	}
	return false;
}

function resetEgg()
{
	eggX = Math.round(Math.random() * 6) + 1;
	eggY = Math.round(Math.random() * 6) + 1;
	while (snakeContainsEgg())
	{
		eggX = Math.round(Math.random() * 6) + 1;
		eggY = Math.round(Math.random() * 6) + 1;
	}
}

function initGame()
{
	snakeX = [];
	snakeY = [];
	snakeX.push(0);
	snakeY.push(0);
	pDirection = RIGHT;
	resetEgg();
	gamePaused = false;
	colorOffset = 0;
}

function init()
{
	midiInput = host.getMidiInPort(0);
	midiOutput = host.getMidiOutPort(0);
	midiInput.setMidiCallback(onMidi);
	noteInput = midiInput.createNoteInput(
		'Ableton Push', 
        '000000', 	// Note off
		'000000', 	// Note on
		'000000',	// Poly Aftertouch
		'000000' 	// Sustain pedal
	);
	noteInput.setShouldConsumeEvents(false);
	midiOutput.sendSysex(SysexSetUserMode);

	clearPads();
	initGame();
	gameLoop();
}

function clearPads()
{
	for (i = 36; i < 100; i++)
	{
		midiOutput.sendMidi(0x90, i, 0);
	}
}

function gameLoop(args)
{
	if (!gamePaused) { update(); }
	draw();
	host.scheduleTask(gameLoop, [], GAME_INTERVAL);
}

function draw()
{
	clearPads();
	// Draw player
	for (var i = 0; i < snakeX.length; i++) {
		midiOutput.sendMidi(0x90, coordinateToPadNumber(snakeX[i], snakeY[i]), padColors[(i + colorOffset) % padColors.length]);
	}
	// Draw egg
	midiOutput.sendMidi(0x90, coordinateToPadNumber(eggX, eggY), 3 /* white */ );
}

function update()
{
	// colorOffset += 1; 
	var oldTailX = snakeX[snakeX.length - 1];
	var oldTailY = snakeY[snakeY.length - 1];

	var copyX = snakeX[0];
	var copyY = snakeY[0];
	for (var i = 1; i < snakeX.length; i++) {
		var tempX = snakeX[i];
		var tempY = snakeY[i];
		snakeX[i] = copyX;
		snakeY[i] = copyY;
		copyX = tempX;
		copyY = tempY;
	}

	switch (pDirection)
	{
		case UP:
			snakeY[0] += 1;
			break;
		case DOWN:
			snakeY[0] -= 1;
			break;
		case RIGHT:
			snakeX[0] += 1;
			break;
		case LEFT:
			snakeX[0] -= 1;
	}

	// Check if the player went out of bounds
	if (snakeX[0] < 0) {
		println('Game Over');
		initGame();
	} else if (snakeX[0] > 7) {
		println('Game Over');
		initGame();
	} else if (snakeY[0] < 0) {
		println('Game Over');
		initGame();
	} else if (snakeY[0] > 7) {
		println('Game Over');
		initGame();
	}

	// Check if the player collided with their tail
	for (var i = 1; i < snakeX.length; i++) {
		if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]) {
			println('Game over, collided with tail');
			initGame();
		}
	}

	if (snakeX[0] == eggX && snakeY[0] == eggY) {
		println('Egg Captured!');
		resetEgg();
		snakeX.push(oldTailX);
		snakeY.push(oldTailY);
	}
}

function onMidi(status, data1, data2)
{
	if (debugMIDI) {
		println('==== Received MIDI Data ====');
		println(status.toString(16));
		println(data1.toString(16));
		println(data2.toString(16));
	}

	if (status == 0xB0 && data2 == 0x7F)
	{
		// Keep player from cheating by not allowing 
		// changes of direction during a pause
		if (!gamePaused) {
			if (data1 == 0x2C) {
				pDirection = LEFT;
			} else if (data1 == 0x2D) {
				pDirection = RIGHT;
			} else if (data1 == 0x2E) {
				pDirection = UP;
			} else if (data1 == 0x2F) {
				pDirection = DOWN;
			}
		}

		// Pause when shift is pressed
		if (data1 == 0x31) {
			gamePaused = !gamePaused;
		}
	}
}

function exit()
{

}