Is Processing a good example of 'event driven programming'?

chrisnewth

Hi - I'm new to processing and this forum. Please could somebody confirm (or otherwise) that processing is a good example of event driven programming. I need to teach this concept to some FE students and would like to introduce them to Processing at some stage - Could this be an ideal time???? Many Thanks.

GoToLoop

Partially yes. I think most modern languages when dealing w/ user input goes w/ the event-driven approach.

quark

Processing is based on Java which readily supports event driven programming.

So Processing would be a good choice especially is the students are new to programming because it hides some of the complexities of the Java language.

Chrisir

Yeah, mousePressed ()

mouseReleased()

mouseClicked()

mouseWheel ()

keyPressed() etc etc ....

jeremydouglass

@chrisnewth -- following @Chrisir --

The Processing UI paradigm is event-driven, and many of its UI demo sketches are good examples of this. I would recommend looking through the reference page under the sections Input > Mouse and Input > Keyboard:

• https://processing.org/reference/

For example:

• https://processing.org/reference/mouseClicked_.html

The mouseClicked() function is called after a mouse button has been pressed and then released.

Mouse and keyboard events only work when a program has draw(). Without draw(), the code is only run once and then stops listening for events.

This introduces the basics:

1. in Processing you define standard functions (such as mouseClicked()) to handle events
2. the system listens for events and then calls those functions
3. in event-driven programming listening and calling process that "drives" events is generally dependent on a "main loop" -- in the case of Processing, this loop is draw()