Tracked-class: Tracked class
In ggbio: Visualization tools for genomic data

Create a tracked object, designed for tracks function.

1 2	Tracked(mutable = TRUE, fixed = FALSE, labeled = TRUE, hasAxis = FALSE, bgColor = "white", height = unit(1, "null"))

`mutable`	logical value, default `TRUE`. To control whether a track is updatable by applying `+` on it.
`fixed`	logical value, default `FALSE`. To control whether the scale response to a xlim change or not.
`labeled`	logical value, default `TRUE`. To control whether to label it all not.
`hasAxis`	logical value, default `FALSE`. To control whether to show axis for that track or not.
`bgColor`	character to control background color of a track.
`height`	unit, to control track height.