> For the complete documentation index, see [llms.txt](https://wecon.gitbook.io/pistudio-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wecon.gitbook.io/pistudio-manual/6.-object/untitled/6.6.12-arc-scale.md).

# 6.6.12 Arc scale

**Introduction**

It displays the scale within the specified arc area. The arc scale needs to specify a center coordinate. The inner and outer circles have two concentric circles that specify the scale length and the display area. The scale is distributed counterclockwise between the start angle and the end angle.

**Description**

![](https://3950998874-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2Fpi-series-user-manual%2F-LuqYe20x74lU6a4YDHT%2F-LuqZ2tcfOvOXpc7ERpI%2F15.png?generation=1575020938856842\&alt=media)

**Line color:** It sets all line in object (including main and sub scale);

**Display direction:** It provides four modes for display;

**Main scale:** It sets the cell of the main scale;

**External radius:** It sets the distance from the center of the circle to the outer circle of object;

**Inner radius:** It sets the distance from the center of the circle to the inner circle of object;

**Start angle:** It displays and sets the start angles of the arc;

**End angle:** It displays and sets the end angles of the arc;