Re: AU parameter display flags

• Subject: Re: AU parameter display flags
• From: William Stewart <email@hidden>
• Date: Tue, 15 Feb 2005 16:47:03 -0800
• Delivered-to: email@hidden
• Delivered-to: email@hidden

I think this is consistent: (had to take the picture out) - but basically, this is what I see when drawing a generic UI from this

Display Square = the param value of 0.5 is transformed to a linear value of 0.25 (the slider's about a quarter of the way across)
Display Square Root - the param value of 0.5 is transformed to a linear value of 0.7071 (the slider's about 2.3 of the way across)

HTH

Bill

On 15/02/2005, at 12:14 PM, Marc Poirier wrote:

On Feb 14, 2005, at 7:19 PM, William Stewart wrote:

This is consistent with the way we use Log/Exp...

So, the idea here is that the parameter value is squared to a linear value with the Display Squared flag

"Display the parameter's value by TRANSFORM_IT function on that value" kind of thing.

In which case, "the parameter's value" is the "linear value" or the literal value? In other words, is it done in AUParameterValueFromLinear() and undone in AUParameterValueToLinear(), or done in AUParameterValueToLinear() and undone in AUParameterValueFromLinear()? That's what the difference here is. You can't directly scale the literal value since it could range anywhere, you would at least need to normalize it, and so anyway, I had thought the idea was apply TRANSFORM_IT to the linear value and then mapping it to the literal range/limits. That's what gives the response's feel to a general control (e.g. slider on a GUI, lines in automation drawing, etc.).

This is how DisplayLog has always been interpreted, so we wanted to be consistent with that.

So far as I can tell, that's not the case. Unless I am just getting mixed up here, the behavior that I see is that DisplayLog is transforming in AUParameterValueFromLinear() and un-transforming in AUParameterValueToLinear(), whereas the rest are transforming in AUParameterValueToLinear() and un-transforming in AUParameterValueFromLinear(). That's why I brought this up. But maybe I am just getting lost...

thanks,
Marc

• Prev by Date: Re: in & out Callbacks
• Next by Date: quick and dirty way to play some data?
• Previous by thread: Re: AU parameter display flags
• Next by thread: Tone Generation
• Index(es):
  • Date
  • Thread