You know this game already.
- Left and right to rotate
- Q and E to rotate slowly
- Up to move
- Space to fire a bullet
- W to fire a big bullet
- S to activate shields
In this game, there are asteroids. Were there not asteroids, the game would not be called Asteroids.
The game of Asteroids is divided into numbered waves. In the first wave, there are four asteroids. In the second wave, there are five asteroids. And so on.
The purpose of your ship is to destroy the asteroids. This purpose can never be fulfilled. This universe is a strange one: it contains an innumerable number of asteroids.
There are, however, items to aid you in your hopeless quest. These are described below.
- Rapid fire: You are Rambo. Rambo is you.
- Multi cannon: You are the large man with the cigar from Boondock Saints. Or rather, you are what he would be if he had three arms.
- Snowballs: You can shoot snowballs, which are deadly to asteroids. However, ships are not very good at making snowballs, for the simple reason that they have no arms. Your snowballs disintegrate into three smaller snowballs in midair. The failure of this horrible dystopian future to provide spaceships with robot arms works to your advantage. You primitivist.
Asteroids uses JavaScript (obviously) and the HTML5 canvas. The sprites are from here, in some cases (the shield) with extensive editing.
Asteroids is written to be easily extensible. All moving objects inherit (with the inherits method in Asteroids.Util) from MovingObject, items inherit from Item, and bullets inherit from Bullet. The handleRemoval hook allows objects to execute actions on removal: powerups execute their effects on the ship, asteroids break apart or disappear depending on size, and the brain boss explodes into asteroids.
New powerups will require modification to ship. In the future, bullet type logic (currently only normal bullet vs. snowball) will be rewritten to make this unnecessary for powerups that improve the bullet type. However, since the ship handles its own firing logic, powerups that modify the ship's firing pattern (PulseCannon and MultiCannon) will require addition of the relevant logic to Ship#shoot.