improve grappling hook physics and rendering

server/game/room/world/body/body.js

@@ -36,6 +36,14 @@ class Body {
 		this.b2body.ApplyTorque(f);
 	}
 
+	setRotation(r) {
+		this.b2body.SetAngleRadians(r);
+	}
+
+	setVelocity(x, y) {
+		this.b2body.SetLinearVelocity(new b2Vec2(x, y));
+	}
+
 	contact() {
 	}
 

server/game/room/world/body/projectile/grapple.js

@@ -12,8 +12,8 @@ class Grapple extends Projectile {
 		this.xvel = pos.xvel;
 		this.yvel = pos.yvel;
 		this.r = pos.r;
-		this.xvel += Math.cos(this.r) * 0.4;
-		this.yvel += Math.sin(this.r) * 0.4;
+		this.xvel += Math.cos(this.r) * 0.25;
+		this.yvel += Math.sin(this.r) * 0.25;
 
 		this.welded = false;
 
@@ -22,8 +22,8 @@ class Grapple extends Projectile {
 
 		this.type = 'grapple';
 		this.frame = [
-			[[0, -8], [5, -12], [4, 0], [0, 0]],
-			[[0, 0], [4, 0], [5, 12], [0, 8]]
+			[[0, -8], [5, -12], [2, 0], [0, 0]],
+			[[0, 0], [2, 0], [5, 12], [0, 8]]
 		];
 	}
 
@@ -39,24 +39,25 @@ class Grapple extends Projectile {
 
 	connect() {
 		let p1 = { x: 0, y: 0.5 };
-		let p2 = { x: 4, y: 0 };
+		let p2 = { x: 0.0625, y: 0 };
 		this.rope = new Rope(this.player.ship, this, p1, p2);
+		this.rope.initLength = 6;
 		this.world.addCopula(this.rope);
-		this.rope.length = 5;
 	}
 
 	contact(body, contact) {
 		if (this.welded || body == this.source)
 			return;
-		this.welded = true;
-		let normal = this.world.physics.contactData(contact).normal;
+		let normal = this.world.physics.contactData(contact).worldNormal;
 		let angle = Math.atan2(normal.y, normal.x);
-		this.b2body.SetAngleRadians(angle);
-		this.world.weld(this, body);
+		this.setRotation(angle + Math.PI);
+		this.b2body.SetAngularVelocity(0);
+		this.setVelocity(0, 0);
+		this.world.weld(this, body, { x: 0.15625, y: 0 });
+		this.welded = true;
 	}
 
 	tickType() {
-
 	}
 
 	packTypeDelta() {

server/game/room/world/body/ship.js

@@ -89,7 +89,7 @@ class Ship extends Body {
 	packTypeDelta() {
 		let t = this.thrust;
 
-		return [t.forward, t.left, t.right];
+		return [t.forward, t.left, t.right, this.debug || false];
 	}
 
 	packFull() {

server/game/room/world/copula/rope.js

@@ -9,11 +9,23 @@ class Rope extends Copula {
 	}
 
 	get length() {
-		return this.b2joint.GetMaxLength();
+		//return this.b2joint.GetMaxLength();
+		return 8;
 	}
 
 	set length(len) {
-		this.b2joint.SetMaxLength(len);
+		//this.b2joint.SetMaxLength(len);
+	}
+
+	packFull() {
+		return {
+			type: 'rope',
+			length: this.length,
+			bodyA: this.bodyA.id,
+			bodyB: this.bodyB.id,
+			posA: this.pointA,
+			posB: this.pointB
+		};
 	}
 }
 

server/game/room/world/index.js

@@ -82,7 +82,7 @@ class World {
 	addCopula(copula) {
 		this.copulae.add(copula);
 		this.physics.createCopula(copula);
-		this.room.broadcast('create', copula.packFull());
+		this.room.broadcast('effect', copula.packFull());
 	}
 
 	applyDelta(body, data) {
@@ -138,8 +138,8 @@ class World {
 		this.room.broadcast('destroy', copula.id);
 	}
 
-	weld(bodyA, bodyB) {
-		this.physics.weld(bodyA, bodyB);
+	weld(bodyA, bodyB, point) {
+		this.physics.weld(bodyA, bodyB, point);
 	}
 
 	start() {

server/game/room/world/physics.js

@@ -21,20 +21,14 @@ class Physics {
 		this.world = new Box2D.b2World(new b2Vec2(0, 0), false);
 		this.toRemove = [];
 		this.toWeld = [];
+		this.contacts = [];
+		this.idk = false;
 
 		let onContact = contact => {
 			let bodya = contact.GetFixtureA().GetBody().GetUserData();
 			let bodyb = contact.GetFixtureB().GetBody().GetUserData();
 
-			if (bodya) {
-				bodya.applyDelta();
-				bodya.contact(bodyb. contact);
-			}
-
-			if (bodyb) {
-				bodyb.applyDelta();
-				bodyb.contact(bodya, contact);
-			}
+			this.contacts.push([bodya, bodyb, contact]);
 		}
 
 		let listener = new Box2D.b2ContactListener();
@@ -58,7 +52,7 @@ class Physics {
 		bodyDef.angularVelocity = body.rvel || 0;
 		bodyDef.bullet = body.type == 'missile';
 		bodyDef.linearDamping = body.type == 'asteroid' ? 0.003 : 0.01;
-		bodyDef.angularDamping = body.type == 'asteroid' ? 0.003 : 0.01;
+		bodyDef.angularDamping = body.type == 'asteroid' ? 0.003 : 0.04;
 		bodyDef.type = body.type == 'structure' ?
 			Box2D.b2BodyType.b2_staticBody : Box2D.b2BodyType.b2_dynamicBody;
 		if (body.player || true) bodyDef.allowSleep = false;
@@ -83,14 +77,18 @@ class Physics {
 
 	// TODO: Make this shorter somehow.
 	createCopula(copula) {
+		let s = SCALE;
+
 		if (copula.type == 'rope') {
 			let b1 = copula.bodyA.b2body;
 			let b2 = copula.bodyB.b2body;
-			let p1 = copula.pointA;
-			let p2 = copula.pointB;
+			let p1 = new b2Vec2(copula.pointA.x, copula.pointA.y);
+			let p2 = new b2Vec2(copula.pointB.x, copula.pointB.y);
 			// See top of file.
-			let start = b1.GetWorldPoint(new b2Vec2(p1.x, p1.y), {});
-			let end = b2.GetWorldPoint(new b2Vec2(p2.x, p2.y), {});
+			let start = b1.GetWorldPoint(p1, {});
+			let end = b2.GetWorldPoint(p2, {});
+			copula.bodyA.debug = p1;
+			//copula.bodyB.debug = end;
 			let dx = start.x - end.x
 			let dy = start.y - end.y;
 			let len = Math.sqrt(dx * dx + dy * dy);
@@ -98,10 +96,10 @@ class Physics {
 			let ropeDef = new Box2D.b2RopeJointDef();
 			ropeDef.bodyA = b1;
 			ropeDef.bodyB = b2;
-			ropeDef.maxLength = len;
+			ropeDef.maxLength = copula.initLength || len;
 			ropeDef.collideConnected = true;
-			ropeDef.worldAnchorA = new b2Vec2(start);
-			ropeDef.worldAnchorB = new b2Vec2(end);
+			ropeDef.localAnchorA = p1;
+			ropeDef.localAnchorB = p2;
 			let b2joint = this.world.CreateJoint(ropeDef);
 
 			copula.b2joint = b2joint;
@@ -109,17 +107,28 @@ class Physics {
 
 	}
 
-	weld(bodyA, bodyB) {
-		this.toWeld.push([bodyA, bodyB]);
+	weld(bodyA, bodyB, point) {
+		let b1 = bodyA.b2body;
+		let b2 = bodyB.b2body;
+		let jointDef = new Box2D.b2WeldJointDef();
+		let anchor = b1.GetWorldPoint(new b2Vec2(point.x, point.y), {});
+		jointDef.bodyA = b1;
+		jointDef.bodyB = b2;
+		jointDef.collideConnected = true;
+		jointDef.localAnchorA = b1.GetLocalPoint(anchor, {});
+		jointDef.localAnchorB = b2.GetLocalPoint(anchor, {});
+		jointDef.localAnchorA = new b2Vec2(jointDef.localAnchorA.x, jointDef.localAnchorA.y);
+		jointDef.localAnchorB = new b2Vec2(jointDef.localAnchorB.x, jointDef.localAnchorB.y);
+		jointDef.referenceAngle = b2.GetAngleRadians() - b1.GetAngleRadians();
+		this.world.CreateJoint(jointDef);
 	}
 
 	contactData(contact) {
 		let worldManifold = new Box2D.b2WorldManifold();
 		contact.GetWorldManifold(worldManifold);
-		let localManifold = new Box2D.b2WorldManifold();
-		contact.GetManifold(localManifold);
+		let localManifold = contact.GetManifold();
 		let worldNormal = worldManifold.normal;
-		let normal = localManifold.normal;
+		let normal = localManifold.localNormal;
 
 		return {
 			normal: normal,
@@ -167,18 +176,25 @@ class Physics {
 			this.world.DestroyBody(this.toRemove[i].b2body);
 		}
 
-		for (var i = 0; i < this.toWeld.length; i++) {
-			let b1 = this.toWeld[i][0].b2body;
-			let b2 = this.toWeld[i][1].b2body;
-			let jointDef = new Box2D.b2WeldJointDef();
-			jointDef.bodyA = b1;
-			jointDef.bodyB = b2;
-			//jointDef.referenceAngle = b1.GetAngleRadians() - b2.GetAngleRadians();
-			this.world.CreateJoint(jointDef);
+		this.toRemove = [];
+
+		for (var i = 0; i < this.contacts.length; i++) {
+			let contact = this.contacts[i][2];
+			let bodya = this.contacts[i][0];
+			let bodyb = this.contacts[i][1];
+
+			if (bodya) {
+				bodya.applyDelta();
+				bodya.contact(bodyb, contact);
+			}
+
+			if (bodyb) {
+				bodyb.applyDelta();
+				bodyb.contact(bodya, contact);
+			}
 		}
 
-		this.toRemove = [];
-		this.toWeld = [];
+		this.contacts = [];
 	}
 }
 

server/game/room/world/traits/ships.json

@@ -5,7 +5,7 @@
 		"power": {
 			"forward": 0.015,
 			"back": 0,
-			"rotation": 0.001
+			"rotation": 0.003
 		},
 		"hull": [
 			[