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data-ice="content"><h1 data-ice="title">src/systems/EntitySystem/index.js</h1> <pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import System from '../System'; import Entity from './Entity'; import Component from './Component'; import { mat4 } from '../../utils/gl-matrix'; export { Entity, Component }; const identityMatrix = mat4.create(); /** * Manages entities on scene. * * @example * const system = new EntitySystem(); * class Hello extends Component { constructor() { this.hello = null; } onAction(name) { console.log(name); } } * system.registerComponent('Hello', () => new Hello()); * system.root = system.buildEntity({ name: 'hey', components: { Hello: { hello: 'world' } } }); * system.updateTransforms(); * system.performAction('hi'); */ export default class EntitySystem extends System { /** @type {Entity|null} */ get root() { return this._root; } /** @type {Entity|null} */ set root(value) { if (!!value && !(value instanceof Entity)) { throw new Error('`value` is not type of Entity!'); } const { _root } = this; if (!!_root) { _root.dispose(); } this._root = value; if (!!value) { value._setOwner(this); } } /** @type {boolean} */ get triggerEvents() { return this._triggerEvents; } /** * Constructor. * * @param {boolean} triggerEvents - Tells if system should trigger events. */ constructor(triggerEvents = true) { super(); this._root = new Entity(); this._components = new Map(); this._triggerEvents = !!triggerEvents; } /** * Destructor (dispose internal resources). * * @example * system.dispose(); * system = null; */ dispose() { const { _root } = this; if (!!_root) { _root.dispose(); } this._components.clear(); this._root = null; } /** * Register new component factory. * * @param {string} typename - Component type name. * @param {Function} componentConstructor - Component factory function (it should return new instance of component). * * @example * class MyComponent extends Component { static factory() { return new MyComponent(); } } * system.registerComponent('MyComponent', MyComponent.factory); */ registerComponent(typename, componentConstructor) { if (typeof typename !== 'string') { throw new Error('`typename` is not type of String!'); } if (!(componentConstructor instanceof Function)) { throw new Error('`componentConstructor` is not type of Function!'); } const { _components } = this; if (_components.has(typename)) { throw new Error(`There is already registered component: ${typename}`); } _components.set(typename, componentConstructor); } /** * Unregister component factory. * * @param {string} typename - Component type name. * * @example * system.unregisterComponent('MyComponent'); */ unregisterComponent(typename) { if (typeof typename !== 'string') { throw new Error('`typename` is not type of String!'); } if (!this._components.delete(typename)) { throw new Error(`There is no registered component: ${typename}`); } } /** * Create component instnace by it's type name and apply properties to it. * * @param {string} typename - Component type name. * @param {*} properties - Object with key-value pairs of component properties. * * @return {Component} Component instance. * * @example * class Hello extends Component { constructor() { this.hello = null; } } * system.registerComponent('Hello', () => new Hello()); * const hello = system.createComponent('Hello', { hello: 'world' }); * console.log(hello.hello); */ createComponent(typename, properties) { if (typeof typename !== 'string') { throw new Error('`typename` is not type of String!'); } const factory = this._components.get(typename); if (!factory) { throw new Error(`There is no registered component: ${typename}`); } const component = factory(); if (!component) { throw new Error(`Cannot create proper component: ${typename}`); } if (!!properties) { for (const name in properties) { component.onPropertySetup(name, properties[name]); } } return component; } /** * Build entity from JSON data. * * @param {*} data - JSON representation of serialized entity data. * * @return {Entity} Entity instance. * * @example * class Hello extends Component { constructor() { this.hello = null; } } * system.registerComponent('Hello', () => new Hello()); * const entity = system.buildEntity({ name: 'hey', components: { Hello: { hello: 'world' } } }); * const hello = entity.getComponent('Hello'); * console.log(hello.hello); */ buildEntity(data) { if (!data) { throw new Error('`data` cannot be null!'); } const { components, children } = data; const result = new Entity(); const options = {}; if ('name' in data) { options.name = data.name; } if ('tag' in data) { options.tag = data.tag; } if ('active' in data) { options.active = data.active; } if ('meta' in data) { options.meta = data.meta; } if ('transform' in data) { options.transform = data.transform; } result.deserialize(options); if (!!components) { for (const name in components) { result.attachComponent(name, this.createComponent(name, components[name])); } } if (!!children) { for (const meta of children.values()) { this.buildEntity(meta).parent = result; } } return result; } /** * Perform action on root entity. * Actions are events that are performed by entity components and are passed down to it's children. * * @param {string} name - action name. * @param {*} args - Action arguments. * * @example * class Hi extends Component { onAction(name, what) { if (name === 'hi') console.log(what); } } * system.registerComponent('Hi', () => new Hi()); * system.root = system.buildEntity({ components: { Hi: {} } }); * system.performAction('hi', 'hello'); */ performAction(name, ...args) { const { _root } = this; if (!!_root) { _root.performAction(name, ...args); } } /** * Update entities transforms. */ updateTransforms() { const { _root } = this; if (!!_root) { _root.updateTransforms(identityMatrix); } } } </code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc(1.1.0)<img src="./image/esdoc-logo-mini-black.png"></a> 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