# Polar chart

> A dashboard item that draws a radar chart, with one spoke per argument value and one closed line per measure, to compare a few series around a cycle.

Source: https://proxus.io/docs/analyze/dashboard-items/polar-chart

The **Polar chart**  draws a radar chart: a web-shaped grid with one
spoke per value of the argument, and one closed line per measure around it. Use it to compare a few series over
something that repeats or has no natural start, such as the days of the week, the shifts of a day or the stations of
a line.

*Screenshot: The polar chart with good units by weekday: one spoke per day from Monday to Sunday, and one line each for Line 1 and Line 2 with the value at every point*

1. **Spoke.** One value of the **Argument** field, such as a weekday, with its name at the outer end. The distance
   from the centre is the value.
2. **Series.** One field of **Value**, drawn as a line that joins its points around the web. With **Display labels**
   on, each point shows its value; labels that would overlap are hidden.
3. **Legend.** The name of each series and its colour.

Select a point to filter the other items of the dashboard by that argument value. The selected points are
highlighted.

## Data fields

Add one or more fields to **Value**; without one the chart stays empty. Each field becomes one line. **Argument** is
a single dimension that gives the spokes, in the order of its rows, so sort it the way the cycle runs (Monday to
Sunday, for example).

## Settings

- **Display labels** writes the value next to each point. Turn it off when the lines are close together and the
  numbers crowd the chart.

## Related

- [Proxus dashboard items](https://proxus.io/docs/analyze/dashboard-items)
- [Use and build dashboards](https://proxus.io/docs/analyze/dashboards)