116 lines
3 KiB
JavaScript
116 lines
3 KiB
JavaScript
'use strict';
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// This file is very similar, but not identical to its client counterpart
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// so most changes done to it should be mirrored there to keep consistent
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// physics between client and server.
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const SCALE = 32;
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const Box2D = require('box2d-html5');
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const b2Vec2 = Box2D.b2Vec2;
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class Physics {
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constructor() {
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this.world = new Box2D.b2World(new b2Vec2(0, 0), false);
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this.toRemove = [];
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let onContact = contact => {
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let bodya = contact.GetFixtureA().GetBody().GetUserData();
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let bodyb = contact.GetFixtureB().GetBody().GetUserData();
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bodya.applyDelta();
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bodyb.applyDelta();
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bodya.contact(bodyb);
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bodyb.contact(bodya);
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}
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let listener = new Box2D.b2ContactListener();
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listener.BeginContact = onContact;
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//listener.EndContact = onContact;
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this.world.SetContactListener(listener);
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}
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createBody(body) {
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//console.log(Object.keys(Box2D.b2Settings).sort());
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//console.log(Box2D.b2Settings.b2_linearSleepTolerance = 0.002);
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let s = SCALE;
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let bodyDef = new Box2D.b2BodyDef();
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bodyDef.userData = body;
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bodyDef.position = new b2Vec2(body.x / s || 0, body.y / s || 0);
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bodyDef.angle = body.r || 0;
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bodyDef.fixedRotation = false;
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bodyDef.active = true;
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bodyDef.linearVelocity = new b2Vec2(body.xvel || 0, body.yvel || 0);
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bodyDef.angularVelocity = body.rvel || 0;
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bodyDef.bullet = body.type == 'missile';
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bodyDef.linearDamping = body.type == 'asteroid' ? 0.003 : 0.01;
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bodyDef.angularDamping = body.type == 'asteroid' ? 0.003 : 0.01;
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bodyDef.type = body.type == 'structure' ?
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Box2D.b2BodyType.b2_staticBody : Box2D.b2BodyType.b2_dynamicBody;
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if (body.player || true) bodyDef.allowSleep = false;
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let b2body = this.world.CreateBody(bodyDef);
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let fixtureDef = new Box2D.b2FixtureDef();
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fixtureDef.density = 10.1;
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fixtureDef.friction = 1;
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fixtureDef.restitution = 1;
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for (var poly of body.frame) {
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poly = poly.map(vertex => new b2Vec2(vertex[0] / s, vertex[1] / s));
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fixtureDef.shape = new Box2D.b2PolygonShape();
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fixtureDef.shape.SetAsArray(poly, poly.length);
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b2body.CreateFixture(fixtureDef);
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}
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body.b2body = b2body;
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//if (body.type == 'ship') console.log(b2body.GetLocalCenter());
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}
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createCopula(copula) {
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}
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raycast(start, end) {
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let p1 = new b2Vec2(start.x, start.y);
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let p2 = new b2Vec2(end.x, end.y);
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let dx = p1.x - p2.x;
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let dy = p1.y - p2.y;
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let dis = Math.sqrt(dx * dx + dy * dy);
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let closest = {
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fraction: 1
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};
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let i = 0;
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this.world.RayCast((fixture, point, normal, fraction) => {
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let body = fixture.GetBody().GetUserData();;
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if (fraction <= closest.fraction) {
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closest = {
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body: body,
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fraction: fraction,
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point: point,
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dis: dis * fraction
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}
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}
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return fraction;
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}, p1, p2);
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return closest.body ? closest : false;
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}
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remove(body) {
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this.toRemove.push(body);
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}
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step() {
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this.world.Step(1, 5, 1 / 60);
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for (var i = 0; i < this.toRemove.length; i++) {
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this.world.DestroyBody(this.toRemove[i].b2body);
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}
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this.toRemove = [];
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}
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}
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module.exports = Physics;
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