Draw circles and triangle for knob indicator.

绘制圆和三角形旋钮指标。

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Draw a ring shape behind the knob and add following layer styles.

画一个圈背后的旋钮的外形和添加图层样式如下。

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Draw a ring shape behind the knob and add following layer styles.

画一个圈背后的旋钮的外形和添加图层样式如下。

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