import { Color , Vector } from "../components" ; import { overrideDefaults } from "../util/config" ; /**
 * Represents a set of options that can be used to create the particle.
 */ export type ParticleCreationOptions = Partial < Omit < Particle , "id" | "initialLifetime" | "initialSize" | "initialRotation" > > ; /**
 * Represents an emitted particle.
 */ export class Particle { /**
     * The unique (symbolic) ID of the particle.
     */ id : symbol ; /**
     * The remaining lifetime of the particle.
     */ lifetime : number ; /**
     * The current size of the particle.
     */ size : number ; /**
     * The current location of the particle, in pixels.
     */ location : Vector ; /**
     * The current rotation of the particle, in euler angles, in degrees.
     */ rotation : Vector ; /**
     * The current velocity of the particle.
     */ velocity : Vector ; /**
     * The current color of the particle.
     */ color : Color ; /**
     * The opacity of the particle (from 0 to 1).
     */ opacity : number ; /**
     * The initial lifetime of the particle.
     */ initialLifetime : number ; /**
     * The initial size of the particle.
     */ initialSize : number ; /**
     * The initial rotation of the particle.
     */ initialRotation : Vector ; /**
     * Creates a new particle instance through the specified options.
     */ constructor ( options ) { const populatedOptions = overrideDefaults ( { lifetime : 0 , size : 1 , location : Vector . zero , rotation : Vector . zero , velocity : Vector . zero , color : Color . white , opacity : 1 , } , options ) ; this . id = Symbol ( ) ; this . size = this . initialSize = populatedOptions . size ; this . lifetime = this . initialLifetime = populatedOptions . lifetime ; this . rotation = this . initialRotation = populatedOptions . rotation ; this . location = populatedOptions . location ; this . velocity = populatedOptions . velocity ; this . color = populatedOptions . color ; this . opacity = populatedOptions . opacity ; } }