update 更新粒子的运动

update

类型: MethodDeclaration

所属类: ParticleElement

定义位置: animation.ts

描述

更新粒子的运动

参数 deltaTime: 增量时间(毫秒)

返回值:返回false表示粒子可以被回收

参数

参数名	类型	描述	默认值
deltaTime	number	-	-

返回值

类型: boolean

返回false表示粒子可以被回收

源代码

位置: 第 2081 行

public update(deltaTime: number): boolean {
    // 计算当前帧新的粒子位置
    this.elapsed += deltaTime
    this.scaleSpeed += this.scaleAccel * deltaTime
    this.scaleFactor += this.scaleSpeed * deltaTime
    this.rotationSpeed += this.rotationAccel * deltaTime
    this.rotationAngle += this.rotationSpeed * deltaTime
    this.movementSpeedX += this.movementAccelX * deltaTime
    this.movementSpeedY += this.movementAccelY * deltaTime
    this.anchorX += this.anchorSpeedX * deltaTime
    this.anchorY += this.anchorSpeedY * deltaTime
    this.x += this.movementSpeedX * deltaTime
    this.y += this.movementSpeedY * deltaTime

    // 计算水平旋转
    this.hRotationExpansionSpeed += this.hRotationExpansionAccel * deltaTime
    this.hRotationRadius += this.hRotationExpansionSpeed * deltaTime
    this.hRotationAngularSpeed += this.hRotationAngularAccel * deltaTime
    this.hRotationAngle += this.hRotationAngularSpeed * deltaTime
    const hRotationOffset = this.hRotationRadius * Math.cos(this.hRotationAngle)
    const hRotationOffsetX = hRotationOffset * Math.cos(this.globalAngle)
    const hRotationOffsetY = hRotationOffset * Math.sin(this.globalAngle)
    this.x += hRotationOffsetX - this.hRotationOffsetX
    this.y += hRotationOffsetY - this.hRotationOffsetY
    this.hRotationOffsetX = hRotationOffsetX
    this.hRotationOffsetY = hRotationOffsetY

    // 计算精灵帧
    switch (this.spriteMode) {
      case 'random':
        break
      case 'animation':
        if (this.spriteFrame < this.spriteCount - 1 &&
          (this.spriteElapsed += deltaTime) >= this.spriteInterval) {
          this.spriteElapsed -= this.spriteInterval
          this.spriteFrame++
          this.updateSpriteFrame()
        }
        break
      case 'animation-loop':
        if ((this.spriteElapsed += deltaTime) >= this.spriteInterval) {
          this.spriteElapsed -= this.spriteInterval
          this.spriteFrame = (this.spriteFrame + 1) % this.spriteCount
          this.updateSpriteFrame()
        }
        break
    }

    // 更新颜色
    this.updateColor()

    // 后期处理
    return this.postProcessing()
  }

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文档生成时间：2025/7/21 20:53:39