Reading Assignment

• Read Chapter 10, pages 154-164.

Program Requirements

• A triangular spaceship should be placed in the middle of the viewing area.
  • When the left arrow key is pressed, it rotates left.
  • When the right arrow key is pressed, it rotates right.
  • When the space bar (K_SPACE) is pressed, it fires a circular missile. The missile originates from the tip of the spaceship and moves in the direction that the triangle is facing.
• Each asteroid originates somewhere on the edge of the screen
  • The total number of asteroids should be specified when calling the function that starts the game.
  • For each asteroid to be created:
    • Randomly select its heading.
    • Set its initial position to be (0, 0)
• When missiles cross the edge of the screen, they should leave the game.
• When asteroids cross the edge of the screen, they should wrap around to the opposite edge.
• When a missile strikes an asteroid:
  • Both the missile and asteroid should vanish.
  • A new asteroid should be randomly generated and added to the game.
• When an asteroid strikes the spaceship, both should vanish and the game ends.

Grading

• Completing the above list of features will suffice to earn a grade of B on the assignment.
• To earn an A, you must add at least one non-trivial additional feature.

Implementation Ideas

• Import Circles and Triangles from the modules you created in the previous assignment. Feel free to modify those classes as necessary.
• Asteroids and missiles are Circle objects; the spaceship is a Triangle object.
• Use lists to store the currently visible asteroids and missiles.
• On each iteration of the event loop:
  • Check for a timer event; if found, update the positions of the asteroids and missiles.
  • Check for keyboard events; if found, update the position of the spaceship, and introduce new missiles as needed.
  • Check for collisions between each asteroid and the spaceship
  • Check for collisions between each missile and each asteroid
  • For each asteroid that goes off the screen, move it to the opposite side
• Here is an example (from class) of an event loop integrating both timer-based and keyboard-based inputs.