Invert Y axis on evdev joysticks #123

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1. jeinstei commented on Oct 17, 2025

   

   jeinstei

   on Oct 17, 2025

   Last edited by jeinstei

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   So more a feature request for a flag in evdev to invert an axis and/or buttons?

   midimonster/backends/evdev.c

   Line 204 in c247b03

   data->relative_axis[data->relative_axes].inverted = 0;
2. phedders commented on Oct 17, 2025

   

   phedders

   on Oct 17, 2025

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   You can write a very simple two line lua filter to do it.
3. phedders commented on Oct 17, 2025

   

   phedders

   on Oct 17, 2025

   Last edited by phedders

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   I havent tested this but soemthing like

   function invert(v)
   output ("inverted"..intput_channel(),1-v);
   end

   load that as a [lua ....] source - you can set the default-hander to invert if you like

   then use a chain such as

   midiX.ch0.note{1..10} > invert.{1..10}
   invert.inverted{1..10} > midiY.ch2.note{1..10}

   (NB dont include the "inverted".. if you just want the "note" to be the same as the input.)
   (NB - seems a bit silly to be adding this to a very old thread... :) )

   😄React with 😄1Reacted by Joshua Einstein-Curtis
4. jeinstei commented on Oct 17, 2025

   

   jeinstei

   on Oct 17, 2025

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   I’m not sure why out would be a filter as opposed to just adding the feature though— i might just write a pr