import { generateEase , hexToRGB , EaseSegment , SimpleEase , Color } from './ParticleUtils' ; import { BasicTweenable } from './EmitterConfig' ; /**
 * A single step of a ValueList.
 */ export interface ValueStep < T > { /**
     * The color or number to use at this step.
     */ value : T ; /**
     * The percentage time of the particle's lifespan that this step happens at.
     * Values are between 0 and 1, inclusive.
     */ time : number ; } /**
 * Configuration for an interpolated or stepped list of numeric or color particle values.
 */ export interface ValueList < T > { /**
     * The ordered list of values.
     */ list : ValueStep < T > [ ] ; /**
     * If the list is stepped. Stepped lists don't determine any in-between values, instead sticking with each value
     * until its time runs out.
     */ isStepped ? : boolean ; /**
     * Easing that should be applied to this list, in order to alter how quickly the steps progress.
     */ ease ? : SimpleEase | EaseSegment [ ] ; } /**
 * A single node in a PropertyList.
 */ export class PropertyNode < V > { /**
     * Value for the node.
     */ public value : V ; /**
     * Time value for the node. Between 0-1.
     */ public time : number ; /**
     * The next node in line.
     */ public next : PropertyNode < V > ; /**
     * If this is the first node in the list, controls if the entire list is stepped or not.
     */ public isStepped : boolean ; public ease : SimpleEase ; param value param time param ease constructor ( value , time , ease ? ) { this . value = value ; this . time = time ; this . next = null ; this . isStepped = false ; if ( ease ) { this . ease = typeof ease === 'function' ? ease : generateEase ( ease ) ; } else { this . ease = null ; } } param data param data . list param data . isStepped param data . ease return public static createList < T extends ( string | number ) > ( data ) { if ( 'list' in data ) { const array = data . list ; let node ; const { value , time } = array [ 0 ] ; const first = node = new PropertyNode ( typeof value === 'string' ? hexToRGB ( value ) : value , time , data . ease ) ; if ( array . length > 2 || ( array . length === 2 && array [ 1 ] . value !== value ) ) { for ( let i = 1 ; i < array . length ; ++ i ) { const { value , time } = array [ i ] ; node . next = new PropertyNode ( typeof value === 'string' ? hexToRGB ( value ) : value , time ) ; node = node . next ; } } first . isStepped = ! ! data . isStepped ; return first as PropertyNode < T extends string ? Color : T > ; } const start = new PropertyNode ( typeof data . start === 'string' ? hexToRGB ( data . start ) : data . start , 0 ) ; if ( data . end !== data . start ) { start . next = new PropertyNode ( typeof data . end === 'string' ? hexToRGB ( data . end ) : data . end , 1 ) ; } return start as PropertyNode < T extends string ? Color : T > ; } }