Asteroids - Java-Gaming.org Asteroids Java Code

	Hey, I'm new here and want to share my new game. Usually I write games just for fun, and never really publish them, because I find them not polished enough. Spent some more time with this one now, and I hope you like it. First of all I want to give some credit to I'd appreciate your feedback. If you find any bugs please let me know. Hope you enjoy

	Oh. What OS do you use? /edit: and have you downloaded the whole zip? The save folder has to be at the same destination as the jar.

Games published by our own members! Check 'em out!

	Can you please start it with the cmd? like 1   2   cd desktop/asteroids java -jar asteroids.jar If there's an error it will show up in the cmd.

	I also get a blank screen when I start it up. I'm using Windows 8 myself. Attempting to start it through the CMD interface (java -jar Asteroids.jar) results in no standard error. However, if I close the UI screen the CMD does not acknowledge an exit (Not sure if that's important in this case or not.)

	I don't get it. I use Windows 8 myself and everything works... Just to be sure, you both downloaded the zip, not just the jar? That's the only idea I have...

	I will upload it somewhere else tomorrow. Hope I'll be able to fix that. I just sent it a friend and it works for him. Could someone else try it please?

Games published by our own members! Check 'em out!

Nice game, works fine for me, Win7 64 Areas for improvement (just some quick critique): Sounds / Music (sounds, like menu blips, blaster fire, and explosions are more important than music for a game like this IMHO, check out if you're interested. I think you should be able to hold down the arrow keys to auto-scroll the menu Maybe I'm just forgetting how the original Asteroid worked, but this would honestly be much more fun if the blaster was manual instead of auto Otherwise, I really like the style and aesthetics you got going here. SO many amateurish games looking far less professional than they might only for lack of a good font!   (and, you know... cohesive looks)

1   2   3   4   5   6   7   8   9   10   Exception in thread "Asteroids" java.lang.IllegalStateException: Buffers have not been created         at sun.awt.X11.XComponentPeer.getBackBuffer(XComponentPeer.java:1223)         at java.awt.Component$FlipBufferStrategy.getBackBuffer(Component.java:4041)         at java.awt.Component$FlipBufferStrategy.updateInternalBuffers(Component.java:4026)         at java.awt.Component$FlipBufferStrategy.revalidate(Component.java:4141)         at java.awt.Component$FlipBufferStrategy.revalidate(Component.java:4123)         at java.awt.Component$FlipBufferStrategy.getDrawGraphics(Component.java:4115)         at main.Game.draw(Game.java:102)         at main.Game.run(Game.java:82)         at java.lang.Thread.run(Thread.java:744) Arch Linux 64-bit. Edit: Tried again, and this time no error, but black screen. Also, when I exit the window it doesn't actually terminate. You may want to look into that or else players will have a whole lot of unwanted processes.

Im using windows 8 and it works perfectly. This game is very polished and looks professional! Great work. Its fun, but it has the potential to be so much more fun if you just fix a few things. 1. The game gets too hard too fast. I have a ton of fun testing my new upgrades and blowing up asteroids but as soon as the spaceships that shoot directly at me show up, im getting spawnkilled over and over again. You dont have to take them out, just nerf them. Maybe make their range really short? 2. A couple of the upgrades are really expensive, like the multiple shot upgrade. I dont know. Maybe it wouldnt be too bad if problem #1 was fixed. 3. When I go to set my name, If you move the cursor right and go up and down to switch letters, it like, moves them left? And gets messed up. Also whats up with the file called "Nothing in here!.txt" haha? I cheated by editing you text save files, and then deleted that other empty file and things got all messed up. (My saves were no longer being loaded properly, I assume). Anyway, this is really a sweet game, good work.

	Slow! Maybe 5~8 fps in Xubuntu 13.10. Why I can't change resolution? At least make the game full screen to improve performance.

My computer is not new but this is not my computer issue. Even a old computer with 1GB ram and Pentium 4 (or even older) must run this kind of 2d games. The problem here, I think, is because the window size. We can't change resolution and 1920x1080 (my screen resolution) is too much for Java games. And on Linux full screen make a huge difference. For example if I play teeworlds minimized I have ~20fps, if I play full screen maybe +~90 fps. The same with other games. Please make this game with real full screen or with an option to change resolution size. My specs (though not the problem): -3GB ram -core 2 duo @ 2.53GHz -Radeon HD 5670

It's definitely not the problem, as I have a Radeon HD 4670, it's 6 years old (a gen behind yours), Fraps reports solid 60 fps (at 1080p). CPU is a Phenom II, but this game appears to be (not going to break out the decomplier, have things to do) single-threaded, so the quad-vs-duo thing doesn't matter a whole lot. I'm not disagreeing with you, aside from the 'too much for Java games,' as I'm honestly puzzled as to why you're getting such poor performance. That said, full-screen should be an option here, if not only to figure this out.

Thanks for all your feedback, I'm glad it works at least for some of you. I'm sorry some of you have all these problems, I'll try to figure out how to fix them. You only need 4 textfiles: highscore, and savegame1-3. If they're empty or something's wrong with them it will automatically clear them and recreate them. At least that's what it should do. @saucymeatman and BurntPizza: I find balancing is one of the hardest parts in a game, but I will try to improve this. Thanks for your tipps. The game is fixed at a resolution of 1920x1080, and I just scale it up or down depending on the actual screen resolution. @ricardo: What do you mean with real fullscreen? What is not real about it? /edit: I might have found a solution for the IllegalStateException. I never had the error, so I don't know if it's fixxed now, but I hope so. Downloadlink above is updated. /edit2: Maybe I should not forget putting the save folder in it. Sorry :/

@bene What do you mean with real fullscreen? What is not real about it? A window with 1920x1080 is not full screen. Yes the window fits the whole screen, but is different from *real* full screen. Also, to improve performance, you can create your game in 800x600 and scale it up, instead of 1920x1820 and scale it down. Or one option to change resolution in-game. This is just my opinion. Personally, I like to make my games in 600x480 or 800x600 and scale them up. And enable full screen (I don't know how to do this in libgdx, but in java2D you only need ).

I did it this way, but there were so many problems with it. I removed the fullscreen-mode now, hoping there will be less errors/black/gray/white screens. You're right, I could've just made it in 800x600, I just didn't think about performance there. As I said in the first post, this is my first game I'm really publishing. Now I'm aware that "runs on my PC" doesn't mean "runs on everyones PC". Next time I'll test it on different machines, sorry for all the problems. Here's the windowed version, I'll replace the link in the startpost as well. I also added some sounds, but some will follow. Thank's to BurntPizza, this site is great.

Everything works fine now. Very hard and addictive I found one error with one quick fix: If we lose all lives we spawn again for a short moment before main menu. Make our spaceship invisible. EDIT: No sound here. Items should be more expensive. With 40 min of game play I already have everything maxed out. Add more items like shields, more bullets, extra life, more powers like wave of bullets etc. Really nice game, if you polish it more and add more stuff you can even sell this.

	I have to say, your UI looks really nice! I am following the same tutorial you used. Does he cover how to do such nice fonts and UI in later parts, or how did you accomplish that?

Thanks for your feedback. @ricardo: I know, as I said I find balancing pretty hard. I think upgrades like firerate or number of bullets (which is kind of like doubling the firerate at the first level) are a bit OP and I'll make them more expensive. Thanks for your tipps @digdugdiggy: For the font I just went to dafont.com. I think in the tutorial is covered how you do things like a menu. If you have any specific questions about it PM me and I can send you some sourcecode if you want.

Asteroids Starter Code Asteroids Java Game

(You should do a save-as on this link. Name the file Morphic-Asteroids.st.)

What we provide

We provide you with a chunk of code which will help you get started. This code implements a basic arcade game, and will set you in the right direction (hopefully). As a game, it works, but if you play it, you'll see that many snazzy features of real game are missing: score keeping, levels, asteroids that split when shot, UFOs, etc. You are of course free to start from scratch. If you understand this code should be easy to modify it implement other arcade games of the same flavor: Time Pilot, Galaga, Space Invaders, etc. Please note that this is not a "plug and play" project: even if you undertake the Asteroids project, you will have to understand and modify almost all of the code we provide in some manner.

The world, roughly speaking, consists of three entities. The player's ship, a collection of bad things (called blobs: asteroids, UFOs, UFO bullets, etc.), and a collection of good things (essentially this is just the player's bullets). While the world could consist just of a single collection of all of the things it contains, it turns out to be more efficient and slightly easier to conceptualize if we organize it this way. All objecs are submorphs of a toplevel morph called WorldMorph. We let the morphic framework classes gather events and step (update) each of the objects in our world.

The code we provide is broken down into the following classes:

• WorldMorph This class maintains the state for the game. It holds collections for the blobs and bullets, the ship, and any other state which is important for the management of the game. An instance of world deals with updating the objects it contains.
• SpaceMorph This is the parent class of all objects in the game. It defines the basic behavior of all objects which float around in outer space. An instance of this class is an object which has a velocity, a shape, and other important state. These objects know how to draw themselves, and a bunch of other basic behaviors.
  • ShipMorph This class inherits from SpaceThing and defines the behavior of a space ship. Currently, a SpaceShip is only used to implement the player's ship, so it does basically everything a SpaceThing does, except that it also handles keyboard events, and has a different default shape. Certain keystrokes cause it to change its angle in in the world, fire bullets, etc.
  • BulletMorph This class inherits from SpaceMorph. It is basically identical except that it dies after a certain number of cycles. When it is dead, it will be removed from the simulation.

Getting Started (Do this Soon!)

1. First, download, open, and try the given code. You ought to be able to evaluate "WorldMorph test" in a workspace and play the game.
2. When you get bored, start looking at the provided code. It's all in a category called "Morphic-Asteroids". Understand how it all fits together. Draw pictures of how the various objects relate to each other.

Making Changes

Once you've understood the provided code, you're ready to start extending and changing it. Make the game more/less realistic -- ships shouldn't just pass through asteroids. Make the game more/less violent -- add different kinds of weapons or turn the game into a civilization-style game, where asteroids are mined or colonized. Add other kinds of (smart) entities, such as UFOs, Klingons, etc. Think about ship health -- using bullets, shields, etc. should cause the ship's health to drop. Add new levels after the current one is complete. Make the game more efficient -- right now, collision detection is "very N-squared" -- data structure gurus will see real possibilities for improving the game in this area.