history page "offset" needs to be split

[dd1]

The history page "offset" field needs to be split into two numbers, so the formula becomes like this: y = offset1 + factor*(value-offset2).

For example, I want to plot 62.5MHz clock frequency (6.25e7) and room temperature (31) on the same scale.

I would plot the frequency as is, and plot the temperature like this: y = 62.5e6 + 10*(temperature-31).

In the current scheme, I have to fuse offset1 and offset2 into one offset number (62.5e6-10*31).

This works as long as I do not need to adjust the value of "factor" (say from 10 to 100 if I want to make the variation of temperature look bigger).

K.O.

[Stefan Ritt]

When I do the JavaScript rewrite of the history pages, I plan to implement multiple overlaying Y-axis. So the factor and offset will go away anyhow and you can scale each value dynamically as you like.

[dd1]

With plotting done in javascript, instead of just offset and factor, we can specify the formula to apply to the data values, with sin(), log(), etc available per javascript. K.O.

[dd1]

in the new history, values are transformed by a formula, in the history plot editor, linear formula will be split into “value offset”, “scale” and “vertical offset”: v = voffset + scale*(v - voffset). K.O.

[dd1]

this has been implemented: old history plots have scale, offset and voffset, and they are automatically hoisted into the "formula" for the new history. K.O.