Provide scaleXTimeOffset for relative duration axis

[vlsi]

The use case is to show "time since test start" axis.

The axis labels should be formatted like "2h 30m", "1d 2h", "1w 2d 3h", or something like that.

[IKupriyanov-HORIS]

Hi! Could you say what kind of data is in input? Is it UNIX-time, formatted strings, zero-based nanosecond events?

[vlsi]

Here's the use-case: apache/jmeter#674 (comment)

The chart displays "arrival rate" vs "time since test started" data.
I prepare the data, so I can prepare it in whatever format is needed.

I think zero-based (nano)second events would work the best, since the display of UNIX-time requires the notion of "timezone", and I do not have timezones (the meaning of the axis is "time since the beginning of the test")

[vlsi]

Just in case, for now, I use a numeric horizontal axis, and I perform manual scaling which adjusts units depending on the total duration. It turned out to be not that bad to show the horizontal axis as "numeric hours" or "numeric minutes".

        val totalDuration = time.last()
        val timeUnit = when {
            totalDuration > 2.5 * TimeUnit.DAYS.toSeconds(1) -> TimeUnit.DAYS
            totalDuration > 2.5 * TimeUnit.HOURS.toSeconds(1) -> TimeUnit.HOURS
            totalDuration > 2.5 * TimeUnit.MINUTES.toSeconds(1) -> TimeUnit.MINUTES
            else -> TimeUnit.SECONDS
        }
        if (timeUnit != TimeUnit.SECONDS) {
            val scale = 1.0 / timeUnit.toSeconds(1)
            for (i in time.indices) {
                time[i] *= scale
            }
        }

[IKupriyanov-HORIS]

Thank you! Will check how we can implement this.

[IKupriyanov-HORIS]

Thank you for your feedback! scale_x_time and scale_y_time are implemented in v2.2.1. Make us know if there are other improvements can be made.