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<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Multiblaster</title>
<style>
html, body {
margin: 0;
height: 100%;
overflow: hidden;
touch-action: none;
background: #999;
-webkit-touch-callout: none;
-webkit-user-select: none;
user-select: none;
touch-action: none;
}
#canvas {
background: #000;
object-fit: contain;
max-width: 100%;
max-height: 100%;
}
#joystick {
position: absolute;
right: 50px;
bottom: 50px;
width: 120px;
height: 120px;
border: 3px solid #FFF;
border-radius: 60px;
opacity: 0.5;
}
#knob {
position: absolute;
left: 20px;
top: 20px;
width: 80px;
height: 80px;
border-radius: 40px;
background-color: #FFF;
}
#initials {
position: fixed; bottom: 10px; right: 70px; padding: .5em; border-radius: 30px;
opacity: 50%; background: lightgray; box-shadow: 1px 1px 5px black;
border: none; color: #000; text-align: center; font-size: 1.2em;
}
</style>
<script src="https://cdn.jsdelivr.net/npm/@multisynq/client@1/bundled/multisynq-client.min.js"></script>
</head>
<body>
<canvas id="canvas" width="1000" height="1000"></canvas>
<div id="joystick"><div id="knob"></div></div>
<input id="initials" type="text" maxlength="10" size="10" placeholder="Initials">
<script>
/////////// Model code is executed inside of synced VM ///////////
class Game extends Multisynq.Model {
init(_, persisted) {
this.highscores = persisted?.highscores ?? {};
this.ships = new Map();
this.asteroids = new Set();
this.blasts = new Set();
this.subscribe(this.sessionId, "view-join", this.viewJoined);
this.subscribe(this.sessionId, "view-exit", this.viewExited);
Asteroid.create({});
this.mainLoop();
}
viewJoined(viewId) {
const ship = Ship.create({ viewId });
this.ships.set(viewId, ship);
}
viewExited(viewId) {
const ship = this.ships.get(viewId);
this.ships.delete(viewId);
ship.destroy();
}
setHighscore(initials, score) {
if (this.highscores[initials] >= score) return;
this.highscores[initials] = score;
this.persistSession({ highscores: this.highscores });
}
mainLoop() {
for (const ship of this.ships.values()) ship.move();
for (const asteroid of this.asteroids) asteroid.move();
for (const blast of this.blasts) blast.move();
this.checkCollisions();
this.future(50).mainLoop(); // move & check every 50 ms
}
checkCollisions() {
for (const asteroid of this.asteroids) {
if (asteroid.wasHit) continue;
const minx = asteroid.x - asteroid.size;
const maxx = asteroid.x + asteroid.size;
const miny = asteroid.y - asteroid.size;
const maxy = asteroid.y + asteroid.size;
for (const blast of this.blasts) {
if (blast.x > minx && blast.x < maxx && blast.y > miny && blast.y < maxy) {
asteroid.hitBy(blast);
break;
}
}
for (const ship of this.ships.values()) {
if (!ship.wasHit && ship.x + 10 > minx && ship.x - 10 < maxx && ship.y + 10 > miny && ship.y - 10 < maxy) {
if (!ship.score && Math.abs(ship.x-500) + Math.abs(ship.y-500) < 40) continue; // no hit if just spawned
ship.hitBy(asteroid);
break;
}
}
}
}
}
Game.register("Game");
class SpaceObject extends Multisynq.Model {
get game() { return this.wellKnownModel("modelRoot"); }
move() {
// drift through space
this.x += this.dx;
this.y += this.dy;
if (this.x < 0) this.x += 1000;
if (this.x > 1000) this.x -= 1000;
if (this.y < 0) this.y += 1000;
if (this.y > 1000) this.y -= 1000;
if (this.a < 0) this.a += 2 * Math.PI;
if (this.a > 2 * Math.PI) this.a -= 2 * Math.PI;
}
}
class Ship extends SpaceObject {
init({ viewId }) {
super.init();
this.viewId = viewId;
this.initials = '';
this.subscribe(viewId, "left-thruster", this.leftThruster);
this.subscribe(viewId, "right-thruster", this.rightThruster);
this.subscribe(viewId, "forward-thruster", this.forwardThruster);
this.subscribe(viewId, "fire-blaster", this.fireBlaster);
this.subscribe(viewId, "set-initials", this.setInitials);
this.reset();
}
reset() {
this.x = 480 + 40 * Math.random();
this.y = 480 + 40 * Math.random();
this.a = -Math.PI / 2;
this.dx = 0;
this.dy = 0;
this.left = false;
this.right = false;
this.forward = false;
this.score = 0;
this.wasHit = 0;
}
leftThruster(active) {
this.left = active;
}
rightThruster(active) {
this.right = active;
}
forwardThruster(active) {
this.forward = active;
}
fireBlaster() {
if (this.wasHit) return;
// create blast moving at speed 20 in direction of ship
const dx = Math.cos(this.a) * 20;
const dy = Math.sin(this.a) * 20;
const x = this.x + dx;
const y = this.y + dy;
Blast.create({ x, y, dx, dy, ship: this });
// kick ship back a bit
this.accelerate(-0.5);
}
move() {
if (this.wasHit) {
// keep drifting as debris for 3 seconds
if (++this.wasHit > 60) this.reset();
} else {
// process thruster controls
if (this.forward) this.accelerate(0.5);
if (this.left) this.a -= 0.2;
if (this.right) this.a += 0.2;
}
super.move();
}
accelerate(force) {
this.dx += Math.cos(this.a) * force;
this.dy += Math.sin(this.a) * force;
if (this.dx > 10) this.dx = 10;
if (this.dx < -10) this.dx = -10;
if (this.dy > 10) this.dy = 10;
if (this.dy < -10) this.dy = -10;
}
setInitials(initials) {
if (!initials) return;
for (const ship of this.game.ships.values()) {
if (ship.initials === initials) return;
}
const highscore = this.game.highscores[this.initials];
if (highscore !== undefined) delete this.game.highscores[this.initials];
this.initials = initials;
this.game.setHighscore(this.initials, Math.max(this.score, highscore || 0));
}
scored() {
this.score++;
if (this.initials) this.game.setHighscore(this.initials, this.score);
}
hitBy(asteroid) {
// turn both into debris
this.wasHit = 1;
asteroid.wasHit = 1;
}
}
Ship.register("Ship");
class Asteroid extends SpaceObject {
init({ size, x, y, a, dx, dy, da }) {
super.init();
if (size) {
// init second asteroid after spliting
this.size = size;
this.x = x;
this.y = y;
this.a = a;
this.dx = dx;
this.dy = dy;
this.da = da;
} else {
// init new large asteroid
this.size = 40;
this.x = Math.random() * 400 - 200;
this.y = Math.random() * 400 - 200;
this.a = Math.random() * Math.PI * 2;
const speed = Math.random() * 4 + 1;
this.dx = Math.cos(this.a) * speed;
this.dy = Math.sin(this.a) * speed;
this.da = (0.02 + Math.random() * 0.03) * (Math.random() < 0.5 ? 1 : -1);
this.wasHit = 0;
this.move(); // random (x,y) is around top-left corner, wrap to other corners
}
this.game.asteroids.add(this);
}
move() {
if (this.wasHit) {
// keep drifting as debris, larger pieces drift longer
if (++this.wasHit > this.size) return this.destroy();
} else {
// spin
this.a += this.da;
}
super.move();
}
hitBy(blast) {
blast.ship.scored();
if (this.size > 20) {
// split into two smaller faster asteroids
this.size *= 0.7;
this.da *= 1.5;
this.dx = -blast.dy * 10 / this.size;
this.dy = blast.dx * 10 / this.size;
Asteroid.create({ size: this.size, x: this.x, y: this.y, a: this.a, dx: -this.dx, dy: -this.dy, da: this.da });
} else {
// turn into debris
this.wasHit = 1;
this.ship = blast.ship;
}
blast.destroy();
}
destroy() {
this.game.asteroids.delete(this);
super.destroy();
// keep at least 5 asteroids around
if (this.game.asteroids.size < 5) Asteroid.create({});
}
}
Asteroid.register("Asteroid");
class Blast extends SpaceObject {
init({x, y, dx, dy, ship}) {
super.init();
this.ship = ship;
this.x = x;
this.y = y;
this.dx = dx;
this.dy = dy;
this.t = 0;
this.game.blasts.add(this);
}
move() {
// move for 1.5 second before disappearing
this.t++;
if (this.t > 30) {
this.destroy();
return;
}
super.move();
}
destroy() {
this.game.blasts.delete(this);
super.destroy();
}
}
Blast.register("Blast");
/////////// Code below is executed outside of synced VM ///////////
class Display extends Multisynq.View {
constructor(model) {
super(model);
this.model = model;
const joystick = document.getElementById("joystick");
const knob = document.getElementById("knob");
document.onkeydown = (e) => {
joystick.style.display = "none";
if (e.repeat) return;
switch (e.key) {
case "a": case "A": case "ArrowLeft": this.publish(this.viewId, "left-thruster", true); break;
case "d": case "D": case "ArrowRight": this.publish(this.viewId, "right-thruster", true); break;
case "w": case "W": case "ArrowUp": this.publish(this.viewId, "forward-thruster", true); break;
case "s": case "S": case " ": this.publish(this.viewId, "fire-blaster"); break;
}
};
document.onkeyup = (e) => {
if (e.repeat) return;
switch (e.key) {
case "a": case "A": case "ArrowLeft": this.publish(this.viewId, "left-thruster", false); break;
case "d": case "D": case "ArrowRight": this.publish(this.viewId, "right-thruster", false); break;
case "w": case "W": case "ArrowUp": this.publish(this.viewId, "forward-thruster", false); break;
}
};
let x = 0, y = 0, id = 0, right = false, left = false, forward = false;
document.onpointerdown = (e) => {
if (!id) {
id = e.pointerId;
x = e.clientX;
y = e.clientY;
joystick.style.left = `${x - 60}px`;
joystick.style.top = `${y - 60}px`;
joystick.style.display = "block";
}
};
document.onpointermove = (e) => {
e.preventDefault();
if (id === e.pointerId) {
let dx = e.clientX - x;
let dy = e.clientY - y;
if (dx > 30) {
dx = 30;
if (!right) { this.publish(this.viewId, "right-thruster", true); right = true; }
} else if (right) { this.publish(this.viewId, "right-thruster", false); right = false; }
if (dx < -30) {
dx = -30;
if (!left) { this.publish(this.viewId, "left-thruster", true); left = true; }
} else if (left) { this.publish(this.viewId, "left-thruster", false); left = false; }
if (dy < -30) {
dy = -30;
if (!forward) { this.publish(this.viewId, "forward-thruster", true); forward = true; }
} else if (forward) { this.publish(this.viewId, "forward-thruster", false); forward = false; }
if (dy > 0) dy = 0;
knob.style.left = `${20 + dx}px`;
knob.style.top = `${20 + dy}px`;
}
}
document.onpointerup = (e) => {
e.preventDefault();
if (id === e.pointerId) {
id = 0;
if (!right && !left && !forward) {
this.publish(this.viewId, "fire-blaster");
}
if (right) { this.publish(this.viewId, "right-thruster", false); right = false; }
if (left) { this.publish(this.viewId, "left-thruster", false); left = false; }
if (forward) { this.publish(this.viewId, "forward-thruster", false); forward = false; }
knob.style.left = `20px`;
knob.style.top = `20px`;
} else {
this.publish(this.viewId, "fire-blaster");
}
}
document.onpointercancel = document.onpointerup;
document.oncontextmenu = e => { e.preventDefault(); this.publish(this.viewId, "fire-blaster"); }
document.ontouchend = e => e.preventDefault(); // prevent double-tap zoom on iOS
initials.ontouchend = () => initials.focus(); // and allow input ¯\_(ツ)_/¯
initials.onchange = () => {
localStorage.setItem("io.multisynq.multiblaster.initials", initials.value);
this.publish(this.viewId, "set-initials", initials.value);
}
if (localStorage.getItem("io.multisynq.multiblaster.initials")) {
initials.value = localStorage.getItem("io.multisynq.multiblaster.initials");
this.publish(this.viewId, "set-initials", initials.value);
// after reloading, our previous ship with initials is still there, so just try again once
setTimeout(() => this.publish(this.viewId, "set-initials", initials.value), 1000);
}
initials.onkeydown = (e) => {
if (e.key === "Enter") {
initials.blur();
e.preventDefault();
}
}
this.smoothing = new WeakMap(); // position cache for interpolated rendering
this.context = canvas.getContext("2d");
}
// update is called once per render frame
// read from shared model, interpolate, render
update() {
this.context.clearRect(0, 0, 1000, 1000);
this.context.fillStyle = "rgba(255, 255, 255, 0.5)";
this.context.lineWidth = 3;
this.context.strokeStyle = "white";
this.context.font = "30px sans-serif";
this.context.textAlign = "left";
this.context.textBaseline = "middle";
// model highscore only keeps players with initials, merge with unnamed players
const highscore = Object.entries(this.model.highscores);
const labels = new Map();
for (const ship of this.model.ships.values()) {
let label = ship.initials;
if (!label) {
label = `Player ${labels.size + 1}`;
highscore.push([label, ship.score]);
}
labels.set(ship, label);
}
// draw sorted highscore
for (const [i, [label, score]] of highscore.sort((a, b) => b[1] - a[1]).entries()) {
this.context.fillText(`${i + 1}. ${label}: ${score}`, 10, 30 + i * 35);
}
// draw ships, asteroids, and blasters
this.context.font = "40px sans-serif";
for (const ship of this.model.ships.values()) {
const { x, y, a } = this.smoothPosAndAngle(ship);
this.drawWrapped(x, y, 300, () => {
this.context.textAlign = "right";
this.context.fillText(labels.get(ship), -30 + ship.wasHit * 2, 0);
this.context.textAlign = "left";
this.context.fillText(ship.score, 30 - ship.wasHit * 2, 0);
this.context.rotate(a);
if (ship.wasHit) this.drawShipDebris(ship.wasHit);
else this.drawShip(ship, ship.viewId === this.viewId);
});
}
for (const asteroid of this.model.asteroids) {
const { x, y, a } = this.smoothPosAndAngle(asteroid);
this.drawWrapped(x, y, 60, () => {
this.context.rotate(a);
if (asteroid.wasHit) this.drawAsteroidDebris(asteroid.size, asteroid.wasHit * 2);
else this.drawAsteroid(asteroid.size);
});
}
for (const blast of this.model.blasts) {
const { x, y } = this.smoothPos(blast);
this.drawWrapped(x, y, 5, () => {
this.drawBlast();
});
}
}
smoothPos(obj) {
if (!this.smoothing.has(obj)) {
this.smoothing.set(obj, { x: obj.x, y: obj.y, a: obj.a });
}
const smoothed = this.smoothing.get(obj);
const dx = obj.x - smoothed.x;
const dy = obj.y - smoothed.y;
if (Math.abs(dx) < 50) smoothed.x += dx * 0.3; else smoothed.x = obj.x;
if (Math.abs(dy) < 50) smoothed.y += dy * 0.3; else smoothed.y = obj.y;
return smoothed;
}
smoothPosAndAngle(obj) {
const smoothed = this.smoothPos(obj);
const da = obj.a - smoothed.a;
if (Math.abs(da) < 1) smoothed.a += da * 0.3; else smoothed.a = obj.a;
return smoothed;
}
drawWrapped(x, y, size, draw) {
const drawIt = (x, y) => {
this.context.save();
this.context.translate(x, y);
draw();
this.context.restore();
}
drawIt(x, y);
// draw again on opposite sides if object is near edge
if (x - size < 0) drawIt(x + 1000, y);
if (x + size > 1000) drawIt(x - 1000, y);
if (y - size < 0) drawIt(x, y + 1000);
if (y + size > 1000) drawIt(x, y - 1000);
if (x - size < 0 && y - size < 0) drawIt(x + 1000, y + 1000);
if (x + size > 1000 && y + size > 1000) drawIt(x - 1000, y - 1000);
if (x - size < 0 && y + size > 1000) drawIt(x + 1000, y - 1000);
if (x + size > 1000 && y - size < 0) drawIt(x - 1000, y + 1000);
}
drawShip(ship, highlight) {
this.context.beginPath();
this.context.moveTo(+20, 0);
this.context.lineTo(-20, +10);
this.context.lineTo(-20, -10);
this.context.closePath();
this.context.stroke();
if (highlight) {
this.context.fill();
}
if (ship.forward) {
this.context.moveTo(-20, +5);
this.context.lineTo(-30, 0);
this.context.lineTo(-20, -5);
this.context.stroke();
}
if (ship.left) {
this.context.moveTo(-18, -9);
this.context.lineTo(-13, -15);
this.context.lineTo(-10, -7);
this.context.stroke();
}
if (ship.right) {
this.context.moveTo(-18, +9);
this.context.lineTo(-13, +15);
this.context.lineTo(-10, +7);
this.context.stroke();
}
}
drawShipDebris(t) {
this.context.beginPath();
this.context.moveTo(+20 + t, 0 + t);
this.context.lineTo(-20 + t, +10 + t);
this.context.moveTo(-20 - t * 1.4, +10);
this.context.lineTo(-20 - t * 1.4, -10);
this.context.moveTo(-20 + t, -10 - t);
this.context.lineTo(+20 + t, 0 - t);
this.context.stroke();
}
drawAsteroid(size) {
this.context.beginPath();
this.context.moveTo(+size, 0);
this.context.lineTo( 0, +size);
this.context.lineTo(-size, 0);
this.context.lineTo( 0, -size);
this.context.closePath();
this.context.stroke();
}
drawAsteroidDebris(size, t) {
this.context.beginPath();
this.context.moveTo(+size + t, 0 + t);
this.context.lineTo( 0 + t, +size + t);
this.context.moveTo(-size - t, 0 - t);
this.context.lineTo( 0 - t, -size - t);
this.context.moveTo(-size - t, 0 + t);
this.context.lineTo( 0 - t, +size + t);
this.context.moveTo(+size + t, 0 - t);
this.context.lineTo( 0 + t, -size - t);
this.context.stroke();
}
drawBlast() {
this.context.beginPath();
this.context.ellipse(0, 0, 2, 2, 0, 0, 2 * Math.PI);
this.context.closePath();
this.context.stroke();
}
}
Multisynq.App.makeWidgetDock(); // shows QR code
Multisynq.Session.join({
apiKey: '234567_Paste_Your_Own_API_Key_Here_7654321', // get your own from multisynq.io/coder
appId: 'io.multisynq.multiblaster-tutorial',
model: Game,
view: Display,
});
</script>
</body>
</html>