Adding keyboard input
Most games have some form of user input; otherwise, they aren't much of a game. In this section, we'll start listening to keyboard events and use them to control our RHB. That means adding keyboard input to the game loop and passing that into the update function. What we will not be doing is yet more refactoring. The system is reasonably well factored at this point and is open to our new changes.
The specific process by which we'll get keyboard events is probably a little different than you're used to if you do web development. In a normal program, you would listen for keys to get pressed – in other words, pushed down and then released – and then do something such as update the screen when the button is released. This doesn't fit in with a game because typical players want the action to happen as soon as a key is pushed down and want it to continue for as long as it's held. Think of moving around the screen with the...
