This week, we are going to build a game in which there is a ghost and lots of bunnies. The game player gets points every time the player is able to steer the ghost into colliding with a bunny. In order to build this game, we introduced two new events for game-playing in Alice. The first is collision detection. We introduce a new event in Alice to process collisions or rather, when Alice detects when one object has collided with another object. In this specific game example will be presenting, the player of the game will try to steer ghost into bunnies, which are hopping around. When it goes collides with a bunny, we want Alice to run code to process that collision. The second event is keys being pressed. The player of the game will need to steer the ghost. We will explore how Alice processes keyboard keys that get pressed, and how to move the ghost forward, and to turn the goes to the right and left in response to keys being pressed. After building a simple collision detection game, we'll spice it up a bit. First, we'll use the timer we learned about last week to try to challenge the game player to collide with all of the bunnies within 30 seconds. We'll next modify the game to randomly turn bunnies red, white, or blue. Colliding with blue bunnies will give the player extra points, while colliding with a red bunny will take points away from the game player. We'll need to change the winning condition from clicking on all of the bunnies to be getting a score of at least five points in the thirty seconds. To accomplish this, we can reuse the scores we learned about last week. Finally, we'll make the game more realistic through the addition of multiple levels, where the later level will be more challenging than the first level. We'll accomplish this modification through the use of a scene variable to keep track of the level. We'll also solve the challenge of placing all of the objects into their correct starting positions before the start of each level. I can't wait to get started.
