Add support for touch events to violent theremin demo

[chrisdavidmills]

@normanr commented on Wed Dec 02 2020

It would be nice to be able to use the demo in a touch environment (eg: phone or tablet). (Not required: sound could be continuous after a 'start/down' event until an 'end/up' event is received)

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@chrisdavidmills commented on Wed Dec 02 2020

I agree that this would be nice.

For reference:

• Demo repo: https://github.com/mdn/webaudio-examples/tree/main/violent-theremin
• Live demo: https://mdn.github.io/webaudio-examples/violent-theremin/

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@normanr commented on Wed Dec 02 2020

(side-note: the event listeners for triggering init should be removed in init, otherwise using the keyboard causes init to be triggered multi times, and DOMExceptions when trying to remove the startMessage that has already been removed).

[Rumyra]

Would it be ok to take this on and give it a bit of a re-write (inc touch events) and also move it into the webaudio-examples repo @chrisdavidmills ?

[chrisdavidmills]

@Rumyra yes, I'm fine with that. It is mentioned a few times on MDN, so make sure there is some kind of redirect in place.

[Rumyra]

Thank you! Yep I think I'm going to roll it into a bigger task of auditing audio, so I'm hoping that won't be too much of a problem 👍

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