Method calcOffsetTop

src/wave-loading.ts:237–256

* 根据进度计算波纹 offsetTop 值

()

   * 根据进度计算波纹 offsetTop 值
   */
  private calcOffsetTop() {
    // 退出以提高性能
    if (
      !this.isCompletedImmediately &&
      this.progress >= WaveLoading.progressThreshold
    ) {
      return
    }

    const maxCrestHeight = Math.max(...(this.options.crestHeight as number[]))

    const top =
      this.progress === 100
        ? -maxCrestHeight
        : Math.ceil(
            ((100 - this.progress) / 100) * this.canvasHeight + maxCrestHeight
          )

    this.setOffsetTop(top)
  }

  /**
   * 窗口尺寸调整事件