Clicky Clicky

Jed Rembold

February 23, 2026

Welcome Back!

I am going to try to have midterms graded by Friday, but I have a lot I am catching up on
Nothing due tonight, but new homework is out!
- Dealing with graphics
- First two problems would already be doable by you
- Third is doable after today

Each group is going to take on the role of a simple program, comprised of several parts
- The Event Loop (The manager): this should be someone comfortable moving around the room
- The Event Queue (The inbox): this individual will manage incoming events and distribute the oldest one to the loop
- The Listeners (The sensors): these students will watch for real world actions, and notify the queue when they see one

You are now getting distributed several things
- Role cards: these let the listeners know what they are listening for, and the loop to know what actions it needs to perform. The event queue also gets a special event to listen for, which won’t come up that often
- Event cards: these are labeled cards that the listeners will hand to the queue when they perceive an event. Once the queue has shown the loop a card, it should be given back to the listeners to be reused

Here you have a coding task. Work in pairs or trios on a single computer.
Your task is to:
- Add a black filled background rectangle to the window the same size as the window
- Add a while filled circle somewhere near the middle (no need to be exact)
- Add a listener so that when the mouse is clicked, the background rectangle changes to a new random color
- Add a listener so that when the mouse is double clicked, the circle moves down the screen one diameter’s distance

Suppose we want to make a basic drawing program
When the user presses the mouse down, we start drawing a line
As the user drags the mouse around, we actively update the placement of that line to end at the users cursor
When the user releases the mouse button, we lock that line onto the screen
Now a new click starts drawing a new line