import { Particle } from '../Particle' ; import { PropertyList } from '../PropertyList' ; import { PropertyNode , ValueList } from '../PropertyNode' ; import { IEmitterBehavior , BehaviorOrder } from './Behaviors' ; import { BehaviorEditorConfig } from './editor/Types' ; /**
 * A Scale behavior that applies an interpolated or stepped list of values to the particle's x & y scale.
 *
 * Example config:
 * ```javascript
 * {
 *     type: 'scale',
 *     config: {
 *          scale: {
 *              list: [{value: 0, time: 0}, {value: 1, time: 0.25}, {value: 0, time: 1}],
 *              isStepped: true
 *          },
 *          minMult: 0.5
 *     }
 * }
 * ```
 */ export class ScaleBehavior implements IEmitterBehavior { public static type = 'scale' ; public static editorConfig : BehaviorEditorConfig = null ; public order = BehaviorOrder . Normal ; private list : PropertyList < number > ; private minMult : number ; constructor ( config ) { this . list = new PropertyList ( false ) ; this . list . reset ( PropertyNode . createList ( config . scale ) ) ; this . minMult = config . minMult ?? 1 ; } initParticles ( first ) { let next = first ; while ( next ) { const mult = ( Math . random ( ) * ( 1 - this . minMult ) ) + this . minMult ; next . config . scaleMult = mult ; next . scale . x = next . scale . y = this . list . first . value * mult ; next = next . next ; } } updateParticle ( particle ) { particle . scale . x = particle . scale . y = this . list . interpolate ( particle . agePercent ) * particle . config . scaleMult ; } } /**
 * A Scale behavior that applies a randomly picked value to the particle's x & y scale at initialization.
 *
 * Example config:
 * ```javascript
 * {
 *     type: 'scaleStatic',
 *     config: {
 *         min: 0.25,
 *         max: 0.75,
 *     }
 * }
 * ```
 */ export class StaticScaleBehavior implements IEmitterBehavior { public static type = 'scaleStatic' ; public static editorConfig : BehaviorEditorConfig = null ; public order = BehaviorOrder . Normal ; private min : number ; private max : number ; constructor ( config ) { this . min = config . min ; this . max = config . max ; } initParticles ( first ) { let next = first ; while ( next ) { const scale = ( Math . random ( ) * ( this . max - this . min ) ) + this . min ; next . scale . x = next . scale . y = scale ; next = next . next ; } } }