- Callbacks

Axes

In a radial chart, such as a radar chart or a polar area chart, there is a single axis that maps points in the angular and radial directions. These are known as .

Multiple X & Y axes are supported.
Scale titles are supported
New scale types can be extended without writing an entirely new chart type

Common Configuration

The following properties are common to all axes provided by Chart.js

Name	Arguments	Description
`beforeUpdate`	`axis`	Callback called before the update process starts.
`beforeSetDimensions`		Callback that runs before dimensions are set.
`afterSetDimensions`	`axis`	Callback that runs after dimensions are set.
`beforeDataLimits`	`axis`	Callback that runs before data limits are determined.
`afterDataLimits`	`axis`	Callback that runs after data limits are determined.
`beforeBuildTicks`	`axis`	Callback that runs before ticks are created.
`afterBuildTicks`	`axis`	Callback that runs after ticks are created. Useful for filtering ticks.
`beforeTickToLabelConversion`		Callback that runs before ticks are converted into strings.
`afterTickToLabelConversion`	`axis`	Callback that runs after ticks are converted into strings.
`beforeCalculateTickRotation`	`axis`	Callback that runs before tick rotation is determined.
`afterCalculateTickRotation`	`axis`	Callback that runs after tick rotation is determined.
`beforeFit`	`axis`	Callback that runs before the scale fits to the canvas.
`afterFit`	`axis`	Callback that runs after the scale fits to the canvas.
`afterUpdate`		Callback that runs at the end of the update process.

The default configuration for a scale can be easily changed using the scale service. All you need to do is to pass in a partial configuration that will be merged with the current scale default configuration to form the new default.

To create a new axis, see the .