Collision Detection, Pickups, and Bullets

So far, we have implemented the main visual aspects of our game. We have a controllable character running around in an arena full of zombies that chase them. The problem is that they don’t interact with each other. A zombie can wander right through the player without leaving a scratch. We need to detect collisions between the zombies and the player.

If the zombies are going to be able to injure and eventually kill the player, it is only fair that we give the player some bullets for their gun. We will then need to make sure that the bullets can hit and kill the zombies.

At the same time, if we are writing collision detection code for bullets, zombies, and the player, it would be a good time to add a class for health and ammo pickups as well.

Here is what we will do and the order in which we will cover things in this chapter:

• Coding the Bullet class
• Making the bullets fly
• Giving the player a crosshair...