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step7.html
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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>Croquet Multiblaster</title>
<style>
html, body {
margin: 0;
height: 100%;
background: #999;
}
#canvas {
background: #000;
object-fit: contain;
max-width: 100%;
max-height: 100%;
}
</style>
<script src="https://unpkg.com/@croquet/[email protected]"></script>
</head>
<body>
<canvas id="canvas" width="1000" height="1000"></canvas>
<script>
class Game extends Croquet.Model {
init() {
this.asteroids = new Set();
for (let i = 0; i < 3; i++) Asteroid.create({});
this.ships = new Map();
this.subscribe(this.sessionId, "view-join", this.viewJoined);
this.subscribe(this.sessionId, "view-exit", this.viewExited);
this.blasts = new Set();
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();
}
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) {
ship.hitBy(asteroid);
break;
}
}
}
}
}
Game.register("Game");
class Asteroid extends Croquet.Model {
get game() { return this.wellKnownModel("modelRoot"); }
init({ size, x, y, a, dx, dy, da }) {
super.init();
this.game.asteroids.add(this);
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;
}
move() {
this.x = (this.x + this.dx + 1000) % 1000;
this.y = (this.y + this.dy + 1000) % 1000;
if (this.wasHit) {
// keep drifting as debris, larger pieces drift longer
this.wasHit++;
if (this.wasHit > this.size) {
this.destroy();
}
} else {
// spin
this.a = (this.a + this.da + Math.PI) % Math.PI;
}
}
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 {
this.wasHit = 1;
}
blast.destroy();
}
destroy() {
this.game.asteroids.delete(this);
super.destroy();
// spawn more asteroids if needed
if (this.game.asteroids.size < 3) Asteroid.create({});
}
}
Asteroid.register("Asteroid");
class Ship extends Croquet.Model {
init({ viewId }) {
super.init();
this.viewId = viewId;
this.reset();
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);
}
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 });
}
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;
}
// float through space
this.x = (this.x + this.dx + 1000) % 1000;
this.y = (this.y + this.dy + 1000) % 1000;
}
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;
}
hitBy(asteroid) {
// turn both into debris
this.wasHit = 1;
asteroid.wasHit = 1;
}
scored() {
this.score++;
}
}
Ship.register("Ship");
class Blast extends Croquet.Model {
get game() { return this.wellKnownModel("modelRoot"); }
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;
}
this.x = (this.x + this.dx + 1000) % 1000;
this.y = (this.y + this.dy + 1000) % 1000;
}
destroy() {
this.game.blasts.delete(this);
super.destroy();
}
}
Blast.register("Blast");
////////////////////////// VIEW //////////////////////////
class Display extends Croquet.View {
constructor(model) {
super(model);
this.model = model;
this.context = canvas.getContext("2d");
this.smoothing = new WeakMap(); // position cache for interpolated rendering
document.onkeydown = (e) => {
if (e.repeat) return;
switch (e.key) {
case "ArrowLeft": this.publish(this.viewId, "left-thruster", true); break;
case "ArrowRight": this.publish(this.viewId, "right-thruster", true); break;
case "ArrowUp": this.publish(this.viewId, "forward-thruster", true); break;
case " ": this.publish(this.viewId, "fire-blaster"); break;
}
};
document.onkeyup = (e) => {
if (e.repeat) return;
switch (e.key) {
case "ArrowLeft": this.publish(this.viewId, "left-thruster", false); break;
case "ArrowRight": this.publish(this.viewId, "right-thruster", false); break;
case "ArrowUp": this.publish(this.viewId, "forward-thruster", false); break;
}
};
}
// update is called once per render frame
update() {
this.context.clearRect(0, 0, 1000, 1000);
this.context.lineWidth = 3;
this.context.strokeStyle = "white";
this.context.fillStyle = "rgba(255, 255, 255, 0.5)";
this.context.font = "40px sans-serif";
this.context.textBaseline = "middle";
for (const asteroid of this.model.asteroids) {
const { x, y, a } = this.smoothPosAndAngle(asteroid);
const { size } = asteroid;
this.context.save();
this.context.translate(x, y);
this.context.rotate(a);
this.context.beginPath();
if (!asteroid.wasHit) {
this.context.moveTo(+size, 0);
this.context.lineTo( 0, +size);
this.context.lineTo(-size, 0);
this.context.lineTo( 0, -size);
} else {
const t = asteroid.wasHit;
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.closePath();
this.context.stroke();
this.context.restore();
}
for (const ship of this.model.ships.values()) {
const { x, y, a } = this.smoothPosAndAngle(ship);
this.context.save();
this.context.translate(x, y);
this.context.fillText(ship.score, 30 - ship.wasHit * 2, 0);
this.context.rotate(a);
this.context.beginPath();
if (!ship.wasHit) {
this.context.moveTo(+20, 0);
this.context.lineTo(-20, +10);
this.context.lineTo(-20, -10);
this.context.closePath();
if (ship.viewId === this.viewId) this.context.fill();
} else {
const t = ship.wasHit;
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();
this.context.restore();
}
for (const blast of this.model.blasts) {
const { x, y } = this.smoothPos(blast);
this.context.save();
this.context.translate(x, y);
this.context.beginPath();
this.context.arc(0, 0, 2, 0, 2 * Math.PI);
this.context.closePath();
this.context.stroke();
this.context.restore();
this.context.beginPath();
}
}
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 distance is large, don't smooth but jump to new position
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;
}
}
Croquet.App.makeWidgetDock(); // show QR code
Croquet.Session.join({
apiKey: '1_i65fcn11n7lhrb5n890hs3dhj11hfzfej57pvlrx', // get your own from croquet.io/keys
appId: 'io.croquet.multiblaster-tutorial',
name: Croquet.App.autoSession(),
password: Croquet.App.autoPassword(),
model: Game,
view: Display,
});
</script>
</body>
</html>