Logarithmic scale on slider

Hi,

I am working on a fitting software and at some point, I would like the user the set the mask of the fit manually with two sliders. My issue right now is that my waves must be displayed on a logarithmic scale and I haven't find any way so far to create a slider with a logarithmic scale.

Here is a picture of what it looks like with un-matched scales. The green curve is the wave I need to fit and the black part represents the mask setting.

Does anyone know how to overcome this issues?

Regards,

Tom
You could use the slider to set log(time) and then set your mask limits to 10^(slider value).
I don't think that you can use a log scale on a slider, but you can set custom tick positions and labels (use userTicks={tvWave,tlblWave }) to achieve the same effect.

Have you considered getting user input in ways other than a slider? I find the graph marquee to be a more natural way to select regions for fitting. See my baseline fitting package for examples.
Hi Tony,

Thank you for your quick answer! Actually my first idea was to use a graph mark method but I didn't how to do this. I will try it in a few days and give you some feedback.

Thanks!
Tom
Tony,

I tried your Baseline package but I stopped because I am using an user-defined function and I didn't know how to implement this in your macro. I thought it might not be a big trouble but I don't understand most of the code your are using and I don't have so much time to invest in this problem.

So I tried your first guest instead, meaning using a variable that is the log of my initial variable and it is working very fine! Here is a picture of how it looks like. The fact that the bottom axis is displayed in a log scale renders a different thickness of the slider limits depending on where they are positionned. I think this is kind of cool ; )

Thank you Tony for you help.

Here is some d├ętails about the code I am using in case someone needs it:

// Sliders variables
variable/G ACFmaskin1Log=0
variable/G ACFmaskout1Log=log(dimsize(Ac_moyennes,0))
Variable ACFSliderLimit=log(dimsize(Ac_moyennes,0))
Variable ACFticksNb=log(dimsize(Ac_moyennes,0))

// Set the slider panel
Execute "ModifyPanel cbRGB=(56797,56797,56797)" // This darken the panel background because default one is very close to the sliders color
DrawText 60,18,"Start"
Slider ACFstart1,pos={105,2},size={597,20},limits={0,ACFSliderLimit,0.001},variable= ACFmaskin1Log,vert=0,live=1,ticks=0,value=0
Slider ACFstart1 proc=ACFSliderStart
DrawText 60,37,"Stop"
Slider ACFstop1,pos={105,22},size={597,20},limits={0,ACFSliderLimit,0.001},variable= ACFmaskout1Log,vert=0,live=1,ticks=ACFticksNb,value=ACFSliderLimit
Slider ACFstop1 proc=ACFSliderStop
DrawText 50,56,"(log ms)"

// Set the mask
Variable/G ACFmaskin1=floor(10^ACFmaskin1Log)
Variable/G ACFmaskout1=floor(10^ACFmaskout1Log)
make/O/N=(dimsize(Ac_moyennes,0)) ACFslidermaskGraph=NaN
ACFslidermaskGraph[ACFmaskin1]=inf
ACFslidermaskGraph[ACFmaskout1]=inf

// Display the mask in a filled cityscape mode.
Appendtograph ACFslidermaskGraph // display the mask on the trace graph
ModifyGraph mode(ACFslidermaskGraph)=5
ModifyGraph rgb(ACFslidermaskGraph)=(65535,65535,65535)
ModifyGraph hbFill(ACFslidermaskGraph)=2

// Each slider procedure contains a re-calculation of the mask and an updating of the graph
Another trick here is to create a value display input on the right end of the sliders and use it to show the actual value (10^input).



--
J. J. Weimer
Chemistry / Chemical & Materials Engineering, UAH
sliderchange.png
Tom_B wrote:
Tony,

I tried your Baseline package but I stopped because I am using an user-defined function and I didn't know how to implement this in your macro. I thought it might not be a big trouble but I don't understand most of the code your are using and I don't have so much time to invest in this problem.



What does your user-defined function look like - maybe you could post it here?
I'll try to post a new version of the baselines package that makes it easy to add a user-defined fitting function.
Hi,

JJweimer: Yep, that's a good idea. I did quite a similar thing, I put two setvar commands on an other panel that do the same job. If I need to do a new version of the soft I might put it just next to the sliders as you did as it's more convenient.

Tony: I am using a model that describes the diffusion of a random walker on a 2D plane, viewed through a square detector (i.e. the pixel of an emCCD camera). I don't think this might be useful to a lot of people. Anyway, here is the formula, you can find it in its original article in Huang H, Simsek MF, Jin W, Pralle A (2015) Effect of Receptor Dimerization on Membrane Lipid Raft Structure Continuously Quantified on Single Cells by Camera Based Fluorescence Correlation Spectroscopy. PLoS ONE 10(3): e0121777. doi:10.1371/journal.pone.0121777

Bye,
Tom
formula.png