emitParticles 发射粒子元素

emitParticles

类型: MethodDeclaration

所属类: ParticleLayer

定义位置: animation.ts

描述

发射粒子元素

参数 deltaTime: 增量时间(毫秒)

参数

参数名	类型	描述	默认值
deltaTime	number	-	-

返回值

类型: void

源代码

位置: 第 1546 行

public emitParticles(deltaTime: number): void {
    let stocks = this.stocks
    // 如果粒子库存量为0，停止发射
    if (stocks === 0) return
    this.elapsed += deltaTime * this.emitter.speed
    const data = this.data
    const interval = data.interval
    let count = Math.floor(this.elapsed / interval)
    if (count > 0) {
      // 0 * Infinity returns NaN
      this.elapsed -= interval * count || 0
      const elements = this.elements
      const maximum = ParticleLayer.maximum
      let eCount = elements.count
      // 如果激活的粒子达到最大数量，停止发射
      if (eCount === maximum) return
      const reserves = this.reserves
      let rCount = reserves.count
      spawn: {
        // 重用旧的粒子
        while (rCount > 0) {
          const element = reserves[--rCount]!
          elements[eCount++] = element
          element.initialize()
          count--
          stocks--
          if (count === 0 || stocks === 0) {
            break spawn
          }
        }
        // 创建新的粒子
        for (let i = this.capacity; i < maximum; i++) {
          elements[eCount++] = new ParticleElement(this)
          this.capacity = i + 1
          count--
          stocks--
          if (count === 0 || stocks === 0) {
            break spawn
          }
        }
      }
      elements.count = eCount
      reserves.count = rCount
      this.stocks = stocks
    }
  }

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文档生成时间：2025/7/21 20:53:39