Glossary · Phase 7 · Software engineering
Event handler
A function you give a program to call when something happens, such as a key press or a timer going off.
Try it now
Keys and the timer only change state. The picture is redrawn from that state every tick.
Learn it properly
Project: Pack Train, an arcade game · A grid game on the turtle canvas: game state as classes, a timer loop, key handlers and a saved best score. About 45 minutes.
Other terms from the same lesson
- game loop: The cycle at the heart of a game: update the state, draw a frame, then wait for the next tick and do it again.
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