Problem 1: Tracing Understanding

When the function to the right is run, what does the screen look like just after 1 second has passed?

def mystery():
    def enigma():
        rect.move(1, 1)

    def puzzle():
        rect.set_filled(True)

    gw = GWindow(200, 200)
    rect = GRect(0, 0, 25, 25)
    gw.add(rect)
    gw.set_interval(enigma, 20)
    gw.set_timeout(puzzle, 1000)

Problem 2: The Setup

• This is a coding problem, work in pairs or trios on a single computer
• In SquareFun.py, I’ve drawn an initial box for you
• Your task is cause the square to move horizontally across the screen such that it takes exactly 5 seconds to cross entirely

Problem 2b: The Growth

• Switch who is typing!
• Now, we want the box to also increase in size as it moves across the screen
• Until it reaches a size of 100 pixels, then it stops growing (but keeps moving)

Problem 2c: Symmetric Growth

• Switch who is typing!
• The box grows from the top left corner atm, which looks weird
• Add logic to also adjust the position of the box so that it seems to grow from the center

Problem 2d: Target Time!

• Switch who is typing!
• I’ve provided you a function that “throws a dart” to a specified position
• Add a timeout so that the dart is thrown when it would strike the center of the box

Problem 2e: Moving the Dart

• Switch who is typing!
• Even if the dart hits the box, the box moves out from under it currently, which looks weird
• Add logic so that the dart is moved along with the box once it hits the board
• This will likely require accessing the same dart object in multiple callback functions, one of which assigns it. How can you manage this?

Problem 3: Obeying Traffic

Growing Circles

• Let’s recreate the following: