Axis
Types
Scalar Axis
Axis scales are available in scalar axis.
Identity Scale (default)
Log Scale
Exponential Scale
Custom Scale
DateTime Axis
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Categorical Axis
A categorical axis provides a center point and width.
The location and size of histogram bars are determined by the axis property.
Tick Locators
A tick locator determines major ticks, minor ticks, and tick labels, and "nice numbers".
Wilkinson
Talbot
An extension of Wilkinson algorithm. It is described in "An Extension of Wilkinson’s Algorithm for Positioning Tick Labels on Axes".
Cryptowatch
A 2-level datetime axis motivated by Cryptowatch. This design reduces the amount of label text, making a clean look without losing the required level of details.
The below is an example of typical datetime labeling. "2020-05-" is unnecessarily repeated and the label space is dense. If there were more ticks, we would have overlapping labels or would have to skip some labels.
On the other hand, 2-level layout has 2 rows of labels. The less important unit (2022-04-xx) is extracted out to the second level. The interval of the first level (5 hours) is determined from the current zoom state, label density, and datetime resolution.
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