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文档中有【HMI】标志的表示：Auto基于SDK实现的示例，可能与Auto最新版本效果存在差异，仅供参考。

1.功能介绍【HMI】

路口转向箭头（粗线红框圈起）

导航过程中，引导转向、动态比例尺的变化，决定着路口转向箭头形状，及显示与消失时机。

路口转向箭头的绘制逻辑。转向箭头的绘制逻辑内聚在BL SDK。

SDK支持三种箭头绘制的效果：2D箭头、3D箭头、精美箭头（V550及以上版本支持）。

2.对应技术模块

箭头图元

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