Viewbuilder Components And Decimals

Renoise Tool Development
1

Hello

Is there a good way to limit the amount of decimals for the value returned by for example a vb:slider.

I realize I can do some handling in the notifier function, but then the binding is pretty useless if I have to do the handling manually anyway.

Consider this:

  
vb:slider {  
 id = "slider_dco1_lfo_mod_depth",  
 min = 0,  
 max = 127,  
 value = 64,  
 width = 170,  
 bind = instrument.dco1_lfo_mod_depth,  
 notifier = function(value)  
 send_sysex(sysex_dco1_lfo_mod_depth, value)  
 end  
},  
vb:value{  
 bind = instrument.dco1_lfo_mod_depth  
}

So, the value from the slider is to be sent via sysex, and it it also bound to a variable in a document object (“instrument”).

But I want the value to be without decimals, both the value that is sent via sysex, the value stored in the document, and the value displayed by the vb:value.

Is there a good way to do this?

Later
F

2

Since you’re dealing with MIDI/SysEx and you’re only interested in sending a whole integer value…

You can simply round the value down using math.floor():

  
send_sysex(sysex_dco1_lfo_mod_depth, math.floor(value))

If you prefer to round up instead of down, you can use math.ceil()

If you prefer to round up or down depending on the value, Lua does not have a native function for this, but you can roll your own quite easily:

  
function round(value)  
 return math.floor(value + 0.5)  
end

round(1.4999) will return 1
round(1.5) will return 2

You can obviously tweak the function, depending on the particular type of rounding you prefer to have.

Hope some of this helps.

3

I’m not at home with Renoise but I know I did something to bind my Lines slider to show and output values with no decimals, or at least I think I remember doing so. Maybe not to the full extent you want but it’s only a small tool so maybe have a look see if you can pull out something useful.

I have to say that GUI in general, especially syncing sliders, value boxes and parameters, has been my biggest struggle with the API so far.

4

Thanks guys!

What I’m trying to do is a tool for editing parameters in a synth. So I have the idea to store the instruments you create in a document, so that you can exchange sounds with others.

So I thought it would be nice if the variables stored were the actual value displayed in the interface and the value send by sysex, ie

60 not 60.234234234

But, if i let that demand go, I could add an observable to each document variable, and when it is changed I send sysex from that notifier (instead of the ui notifier), that way, when you load a document (instrument) all the parameters are automatically sent to the synth.

And if I add the same rounding to the vb:value field then I’m home I think.

Thanks, I think you helped me move on…