22b. Bubble Wrap

• A bunch of circles of random size and color are placed around the screen.
• When you click on a circle, it disappears.
• Only the top circle should disappear if multiple circles are stacked.

Model

First, think about one bubble. How will you represent that? You need to keep track of at least:

• center
• radius
• color

Next, think about all of the bubbles. How will you represent a bunch of bubbles?

Drawing

It is good to get your draw handler written early, so you can see what is going on. I recommend that you write one function to draw a single bubble on a background, and another function to draw all of the bubbles.

Logic

You need to remove the bubble you click on from the game. I think that is best done in two steps:

• clicked-on-bubble?: bubble posn(click) -> boolean. True if the click is inside the given bubble.
• remove-clicked: list of bubbles posn(click) -> list of bubbles