56 lines
1.5 KiB
JavaScript
56 lines
1.5 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 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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}
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createBody(body) {
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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 || 0, body.y || 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 || 0.05, body.yvel || 0);
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bodyDef.angularVelocity = body.rvel || 0;
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bodyDef.type = body.type == 'static' ?
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Box2D.b2Body.b2_staticBody : Box2D.b2Body.b2_dynamicBody;
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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;
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fixtureDef.friction = 1;
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fixtureDef.restitution = 0;
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for (var poly of body.structure) {
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poly = poly.map(vertex => new b2Vec2(vertex[0], vertex[1]));
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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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}
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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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console.log(this.world.GetBodyList());
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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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