The linear scale is used to chart numerical data. As the name suggests, linear interpolation is used to determine where a value lies in relation the center of the axis.
The following additional configuration options are provided by the radial linear scale.
## Configuration Options
The axis has configuration properties for ticks, angle lines (line that appear in a radar chart outward from the center), pointLabels (labels around the edge in a radar chart). The following sections define each of the properties in those sections.
The following options are provided by the linear scale. They are all located in the `ticks` sub options. The [common tick configuration](../styling.md#tick-configuration) options are supported by this axis.
The `suggestedMax` and `suggestedMin` settings only change the data values that are used to scale the axis. These are useful for extending the range of the axis while maintaining the auto fit behaviour.
let minDataValue = Math.min(mostNegativeValue, options.ticks.suggestedMin);
let maxDataValue = Math.max(mostPositiveValue, options.ticks.suggestedMax);
```
In this example, the largest positive value is 50, but the data maximum is expanded out to 100. However, because the lowest data value is below the `suggestedMin` setting, it is ignored.
In contrast to the `suggested*` settings, the `min` and `max` settings set explicit ends to the axes. When these are set, some data points may not be visible.
If set, the scale ticks will be enumerated by multiple of `stepSize`, having one tick per increment. If not set, the ticks are labeled automatically using the nice numbers algorithm.
The following options are used to configure angled lines that radiate from the center of the chart to the point labels. They can be found in the `angleLines` sub options.
| `borderDash` | `number[]` | `[]` | Length and spacing of dashes on angled lines. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash).
| `borderDashOffset` | `number` | `0.0` | Offset for line dashes. See [MDN](https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/lineDashOffset).
The following options are used to configure the point labels that are shown on the perimeter of the scale. They can be found in the `pointLabels` sub options.
| `callback` | `function` | | Callback function to transform data labels to point labels. The default implementation simply returns the current string.
| `fontColor` | <code>Color|Color[]</code> | `'#666'` | Font color for point labels.
| `fontFamily` | `string` | `"'Helvetica Neue', 'Helvetica', 'Arial', sans-serif"` | Font family to use when rendering labels.
| `fontSize` | `number` | `10` | font size in pixels.
| `fontStyle` | `string` | `'normal'` | Font style to use when rendering point labels.
| `lineHeight` | <code>number|string</code> | `1.2` | Height of an individual line of text (see [MDN](https://developer.mozilla.org/en-US/docs/Web/CSS/line-height)).