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'./Script'; import { vec2 } from '../utils/gl-matrix'; import { b2World, b2Vec2, Dynamics } from '../utils/box2d'; export default class PhysicsWorld extends Script { static factory() { return new PhysicsWorld(); } static get propsTypes() { return { ...Script.propsTypes, gravity: 'vec2', doSleep: 'boolean', iterations: 'integer', timeScale: 'number' }; } get gravity() { return this._gravity; } set gravity(value) { if (!(value instanceof Array)) { throw new Error('`value` is not type of Array!'); } if (value.length < 2) { throw new Error('`value` must have at least 2 elements!'); } vec2.copy(this._gravity, value); const { _world } = this; if(!!_world) { _world.SetGravity(new b2Vec2(value[0], value[1])); } } get doSleep() { return this._doSleep; } set doSleep(value) { if (typeof value !== 'boolean') { throw new Error('`value` is not type of Boolean!'); } this._doSleep = value; } get iterations() { return this._iterations; } set iterations(value) { if (typeof value !== 'number') { throw new Error('`value` is not type of Number!'); } this._iterations = value | 0; } get timeScale() { return this._timeScale; } set timeScale(value) { if (typeof value !== 'number') { throw new Error('`value` is not type of Number!'); } this._timeScale = value; } get world() { return this._world; } constructor() { super(); this._gravity = vec2.create(); this._doSleep = true; this._iterations = 1; this._timeScale = 1; this._world = null; this._contactListener = null; this._onBeginContact = this.onBeginContact.bind(this); this._onEndContact = this.onEndContact.bind(this); } dispose() { super.dispose(); this._gravity = null; this._world = null; this._contactListener = null; } rayCast(callback, startX, startY, endX, endY) { if (!callback) { throw new Error('`callback` cannot be null!'); } if (typeof startX !== 'number') { throw new Error('`startX` is not type of Number!'); } if (typeof startY !== 'number') { throw new Error('`startY` is not type of Number!'); } if (typeof endX !== 'number') { throw new Error('`endX` is not type of Number!'); } if (typeof endY !== 'number') { throw new Error('`endY` is not type of Number!'); } const { _world } = this; if (!!_world) { _world.RayCast( (fixture, point, normal, fraction) => { return callback( fixture.GetUserData(), point, normal, fraction ); }, new b2Vec2(startX, startY), new b2Vec2(endX, endY) ); } } rayCastOne(startX, startY, endX, endY) { if (typeof startX !== 'number') { throw new Error('`startX` is not type of Number!'); } if (typeof startY !== 'number') { throw new Error('`startY` is not type of Number!'); } if (typeof endX !== 'number') { throw new Error('`endX` is not type of Number!'); } if (typeof endY !== 'number') { throw new Error('`endY` is not type of Number!'); } const { _world } = this; if (!!_world) { const result = _world.RayCastOne( new b2Vec2(startX, startY), new b2Vec2(endX, endY) ); return !!result ? result.GetUserData() : null; } return null; } rayCastAll(startX, startY, endX, endY) { if (typeof startX !== 'number') { throw new Error('`startX` is not type of Number!'); } if (typeof startY !== 'number') { throw new Error('`startY` is not type of Number!'); } if (typeof endX !== 'number') { throw new Error('`endX` is not type of Number!'); } if (typeof endY !== 'number') { throw new Error('`endY` is not type of Number!'); } const { _world } = this; if (!!_world) { const result = _world.RayCastAll( new b2Vec2(startX, startY), new b2Vec2(endX, endY) ); return !!result ? result.map(fixture => fixture.GetUserData()) : null; } return null; } onAttach() { const { _gravity, _doSleep } = this; const world = this._world = new b2World( new b2Vec2(_gravity[0], _gravity[1]), _doSleep ); const contactListener = new Dynamics.b2ContactListener(); contactListener.BeginContact = this._onBeginContact; contactListener.EndContact = this._onEndContact; world.SetContactListener(contactListener); } onDetach() { this._world = null; } onUpdate(deltaTime) { const { _world, _iterations, _timeScale } = this; if (!!_world) { _world.Step(deltaTime * 0.001 * _timeScale, _iterations, _iterations); } } onBeginContact(contact) { const bodyA = contact.GetFixtureA().GetUserData(); const bodyB = contact.GetFixtureB().GetUserData(); if (!!bodyA && bodyA.listenForContacts) { const { entity } = bodyA; if (!!entity) { entity.performAction('begin-contact', bodyB, contact); } } if (!!bodyB && bodyB.listenForContacts) { const { entity } = bodyB; if (!!entity) { entity.performAction('begin-contact', bodyA, contact); } } } onEndContact(contact) { const bodyA = contact.GetFixtureA().GetUserData(); const bodyB = contact.GetFixtureB().GetUserData(); if (!!bodyA && bodyA.listenForContacts) { const { entity } = bodyA; if (!!entity) { entity.performAction('end-contact', bodyB, contact); } } if (!!bodyB && bodyB.listenForContacts) { const { entity } = bodyB; if (!!entity) { entity.performAction('end-contact', bodyA, contact); } } } } </code></pre> </div> <footer class="footer"> Generated by <a 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