add non-functioning explosions

I'm tired and box2d ray casting is stupid so this'll have to do for today

server/game/room/world/body.js

@@ -22,13 +22,17 @@ class Body {
 
 	applyForce(x, y, center) {
 		let b = this.b2body;
-		b.ApplyForce(new b2Vec2(x, y), b.GetWorldCenter());
+		let c = center ? new b2Vec2(center.x, center.y) : b.GetWorldCenter();
+		b.ApplyForce(new b2Vec2(x, y), c);
 	}
 
 	applyTorque(f) {
 		this.b2body.ApplyTorque(f);
 	}
 
+	contact() {
+	}
+
 	tick() {
 		let pos = this.b2body.GetPosition();
 		let bounds = this.world.bounds;
@@ -74,6 +78,13 @@ class Body {
 			r: this.b2body.GetAngleRadians()
 		};
 	}
+
+	get vel() {
+		return {
+			xvel: this.b2body.GetLinearVelocity().x,
+			yvel: this.b2body.GetLinearVelocity().y
+		}
+	}
 }
 
 module.exports = Body;

server/game/room/world/index.js

@@ -65,6 +65,19 @@ class World {
 		this.players.forEach(player => player.delta[body] = data);
 	}
 
+	explosion(pos, power) {
+		var rays = Array(50).fill().map((_, i) => {
+			let a = Math.PI * i / 25;
+			let x = pos.x + Math.cos(a) * Math.sqrt(power);
+			let y = pos.y + Math.sin(a) * Math.sqrt(power);
+			return this.physics.raycast(pos, { x : x, y: y }, (body, point, dis) => {
+				dis = Math.max(dis, 0.5);
+				let force = power * (1 / dis) * (1 / dis);
+				body.applyForce(x * force, y * force, point);
+			});
+		});
+	}
+
 	populate() {
 		for (var i = 0; i < 40; i++) {
 			let pos = {

server/game/room/world/missile.js

@@ -8,6 +8,8 @@ class Missile extends Body {
 
 		this.x = pos.x * 32;
 		this.y = pos.y * 32;
+		this.xvel = pos.xvel;
+		this.yvel = pos.yvel;
 		this.r = pos.r;
 
 		this.source = source;
@@ -18,8 +20,12 @@ class Missile extends Body {
 		this.frame = [[[0, 0], [10, 0], [10, 3], [0, 3]]];
 	}
 
+	contact(body) {
+		this.detonate();
+	}
+
 	detonate() {
-		// Blow up stuff.
+		this.world.explosion(this.pos, 10);
 		this.world.removeBody(this);
 	}
 
@@ -28,7 +34,7 @@ class Missile extends Body {
 		let x = Math.cos(this.b2body.GetAngleRadians()) * power;
 		let y = Math.sin(this.b2body.GetAngleRadians()) * power;
 		this.applyForce(x, y);
-		
+
 		if(this.fuel-- <= 0)
 			this.detonate();
 	}

server/game/room/world/physics.js

@@ -21,11 +21,14 @@ class Physics {
 
 			bodya.applyDelta();
 			bodyb.applyDelta();
+
+			bodya.contact(bodyb);
+			bodyb.contact(bodya);
 		}
 
 		let listener = new Box2D.b2ContactListener();
 		listener.BeginContact = onContact;
-		listener.EndContact = onContact;
+		//listener.EndContact = onContact;
 
 		this.world.SetContactListener(listener);
 	}
@@ -66,12 +69,36 @@ class Physics {
 		//if (body.type == 'ship') console.log(b2body.GetLocalCenter());
 	}
 
+	raycast(start, end, callback) {
+		let p1 = new b2Vec2(start.x, start.y);
+		let p2 = new b2Vec2(end.x, end.x);
+		let dx = p1.x - p2.x;
+		let dy = p1.y - p2.y;
+		let dis = Math.sqrt(dx * dx + dy * dy);
+		let closest = {};
+		let i = 0;
+		this.world.RayCast((fixture, point, normal, fraction) => {
+			let body = fixture.GetBody().GetUserData();;
+			if (fraction <= closest.fraction) {
+				closest = {
+					body: body,
+					fraction: fraction,
+					point: point
+				}
+			}
+			//console.log(fixture.GetNext());
+			callback(body, point, dis * fraction);
+			return fraction;
+		}, p1, p2);
+	}
+
 	remove(body) {
 		this.toRemove.push(body);
 	}
 
 	step() {
 		this.world.Step(1, 5, 1 / 60);
+
 		for (var i = 0; i < this.toRemove.length; i++) {
 			this.world.DestroyBody(this.toRemove[i].b2body);
 		}

server/game/room/world/ship.js

@@ -9,6 +9,9 @@ class Ship extends Body {
 	constructor(world, pos, player, build) {
 		super(world);
 
+		this.x = pos.x || 0;
+		this.y = pos.y || 0;
+
 		build = build || {};
 		this.class = build.ship || defaults.spawnShip.ship;
 		this.turrets = build.turrets || defaults.spawnShip.turrets;

server/game/room/world/spawner.js

@@ -24,7 +24,9 @@ class Spawner {
 		let pos = {
 			x: ship.center.x + ox,
 			y: ship.center.y + oy,
-			r: r
+			r: r,
+			xvel: ship.vel.x,
+			yvel: ship.vel.y
 		};
 		let missile = new Missile(this.world, pos, ship);
 		this.world.addMissile(missile);