Changing parameter range (REVISITED)

Audio Plugins
5

Sure. I defined a NormalisableRange like this:

	NormalisableRange<float> myParamRange = NormalisableRange<float>
(
	0.0, 1.0, // ignored in functions below
	[this]( float start, float end, float value0To1 ) // convertFrom0To1Func
	{
	 return this->convertMyParamFrom0To1( value0To1 );
	},
	[this]( float start, float end, float worldValue ) // convertTo0To1Func
	{
	 return this->convertMyParamTo0To1( worldValue );
	},
	[this]( float start, float end, float valueToSnap ) // snapToLegalValueFunc
	{
	 return this->snapMyParamToLegalValue( valueToSnap );
	}
);
// Need these to be 0, so that the attachment causes the control to use this NormalisableRange.
myParamRange = 0.0;
myParamRange = 0.0;
//
pMyParam = parameters.createAndAddParameter( myParaMID,
	"My parameter",
	{},
	myParamRange,
	0.0f,   // default
	nullptr,
	nullptr,
	false,  // not meta
	false,    // automatable
	true, // discrete
	AudioProcessorParameter::genericParameter,
	false ); // boolean
parameters.addParameterListener( myParamID, this );

And in those functions, I simply convert the values by multiplying or dividing by the number of items currently in the associated drop-down (minus 1).

1 Like
Strategies for altering parameters range and interval