Scatter Plot X-axis is unreadable

[timhallinflux]

I've got a scatter plot which uses days as the x-axis (starting from day 0). However, the x-axis has no controls over how many "ticks" to display. There is no data in the (x.5) day tick, yet these are being displayed and the number of x-axis "ticks" essentially make it unreadable as a result.

In the query builder/script editor mode, the x-axis is readable, but somehow this doesn't translate to the dashboard once saved.

[TCL735]

The spacing between ticks made an assumption that _time would always be on the horizontal axis and _value would always be on the vertical axis. In practice, either axis can be _time or _value or even both.

The spacing between ticks is subject to design considerations. So, the ultimate solution would be a feature request to allow the user to control the tick generation: allow both the step (difference between each tick) and also the number of ticks marked on the axes.

For now, as a default, we will apply minimum spacing with these rules:

• when there are less than 4 ticks:
  for each tick, spacing is one-quarter of the length of a tick
  thusly: 0.25, 0.50, 0.75 of a tick's length as spacing for 1, 2, and 3 ticks respectively
• when there are 4 to 10 ticks:
  sum of all tick lengths is shorter than total available space by at least one tick's length
• when there are more than 10 ticks:
  for every group of up to 10 ticks there is spacing equal at least 1 tick's length
• length of a tick is:
  vertically: average of the height and width of a span that wraps the formatted last tick in the range
  horizontally: the width of a span that wraps the formatted last tick in the range
• additionally, vertical spacing has a limit of 5 times the height of a span that wraps the the formatted last tick in the range