Adding a function to the "Processing Animation Thread"

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@aframires

Basically I would like to queue an event to be safely handled at the end of draw(), inside the UDP Thread.

• For most simple cases, a humble global boolean variable should be just enough.
• Set it to true inside the threaded callback.
• Then inside draw() keep checking whether it had become true.
• If yes, set it back to false, and do the tasked drawing action there.