render method

@override void render(Canvas canvas)

精灵渲染

Implementation

@override
void render(Canvas canvas) {
  /// 画布暂存
  canvas.save();

  /// 将子精灵转换为相对坐标
  if (parent == null) {
    canvas.translate(position.x, position.y);
  } else {
    canvas.translate(position.x - parent!.size.width / 2, position.y - parent!.size.height / 2);
  }

  /// 精灵矩形边界
  /// var paint = new Paint()..color = Color(0x6000FF00);
  /// canvas.drawRect(Rect.fromLTWH(- size.width/2,- size.height/2, size.width, size.height), paint);

  /// 渲染动画帧
  if (this.frames[this.currentAnimation] != null && this.frames[this.currentAnimation]!.length > 0) {
    List<DFImageSprite> sprites = this.frames[this.currentAnimation]!;
    sprites[this.currentIndex].flippedX = currentAnimationFlippedX;
    sprites[this.currentIndex].color = color;
    sprites[this.currentIndex].render(canvas);
  }

  /// 渲染子精灵
  if (children.length > 0) {
    children.forEach((sprite) {
      sprite.render(canvas);
    });
  }

  /// 渲染绑定精灵
  bindSprites.forEach((sprite) {
    if (sprite.visible &&
        sprite.frames[this.currentAnimation] != null &&
        this.frames[this.currentAnimation] != null) {
      /// 绑定精灵帧数不一定完全对应 所以这里计算一下接近值，保证速度和最后动画结束时间一致
      double offset = sprite.frames[this.currentAnimation]!.length / this.frames[this.currentAnimation]!.length;
      sprite.currentIndex = (this.currentIndex * offset).round();
      sprite.currentAnimation = this.currentAnimation;
      sprite.currentAnimationFlippedX = currentAnimationFlippedX;
      sprite.render(canvas);
    }
  });

  /// 画布恢复
  canvas.restore();
}