update method

@override void update(double dt)

精灵更新

Implementation

@override
void update(double dt) {
  /// 控制动画帧切换
  if (this.frames[this.currentAnimation] != null && this.frames[this.currentAnimation]!.length > 0) {
    List<DFImageSprite> sprites = this.frames[this.currentAnimation]!;

    /// 控制动画帧按照stepTime进行更新
    if (DateTime.now().millisecondsSinceEpoch - this.frameClock > this.stepTime) {
      this.frameClock = DateTime.now().millisecondsSinceEpoch;
      if (sprites.length > this.currentIndex + 1) {
        this.currentIndex = this.currentIndex + 1;
      } else {
        /// 如果循环就从0再次开始
        if (this.loop) {
          this.currentIndex = 0;
        } else {
          /// 动画播放到完成
          if (onComplete != null) {
            onComplete!(this);
          }
        }
      }
    }
  }
  super.update(dt);
}