Description
From Asteroids.java:
/*
______________________________________________________________________________
/ __________________________ o o o o o _______________________ \
| / \_______________________/ \ |
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| | f#K; :j / /___/ / / /__/ / ___> \ ___> \ | |
| | jW. ,E <_____________/ \ ______/ <______/ <______/ | |
| | ,, G GttfLGDKKW Ef, | |
| | iK t ...... Copyright (c) 2005 Mujtaba Hasni | |
| | jW D | |
| | iDj http://enemyboss.net | |
| | : enemyboss@gmail.com | |
| | | |
| | Presents: ________________________________ | |
| \_____________________/ E N E M Y A S T E R O I D S \___________________/ |
| | | |
| | ___ .------. | |
| | ____ / \ .-' \ | |
| | / \ ^ / | / \ | |
| | \ \ \ ; / | | |
| | __ \.-._/ '-^-' | | | |
|'| _/ \__ \ / |'|
| | .-' '\ /\ \ / | |
|'| | \ //\\ \ __/ |'|
| | |_ | / \/ \ '-.____/ | |
|'| \ | /______\ |'|
| | \. _/ /.''''''.\ | |
|'| \_.--' |'|
| | _______________________________________________ | |
|'| / "The knack of flying is to throw yourself at | |'|
| | | the ground and miss." | | |
| | | ; | |
| | | -- Hitchhikers Guide To The Galaxy / | |
| | |_____________________________________________/ | |
| | | |
| | _____________________________________ | |
| \__________________/ D I S T R I B U T E D U N D E R \_________________/ |
| | | |
| |--[ The MIT License ] | |
| | | |
| | Copyright (c) 2005 Mujtaba Hasni www.enemyboss.net | |
| | | |
| | Permission is hereby granted, free of charge, to any person obtaining a | |
| | copy of this software and associated documentation files (the | |
|'| "Software") to deal in the Software without restriction, including |'|
| | without limitation the rights to use, copy, modify, merge, publish, | |
|'| distribute, sublicense, and/or sell copies of the Software, and to |'|
| | permit persons to whom the Software is furnished to do so, subject to | |
|'| the following conditions: |'|
| | | |
|'| The above copyright notice and this permission notice shall be included |'|
| | in all copies or substantial portions of the Software. | |
|'| |'|
| | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
| | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
| | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
| | IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | |
| | CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | |
| | TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | |
| | SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| | | |
| | * * * | |
| | __________________________________ | |
| \_____________________/ R e v i s i o n H i s t o r y \_________________/ |
| | | |
|'| * Version 1.0a / Jun. 02 2005 / Alpha Release. |'|
| | | |
|'| _________________________ |'|
| \_________________________/ D e s c r i p t i o n \______________________/ |
| | | |
| |--[ Introduction ] | |
| | | |
| | Atari's Asteroids was the most popular arcade game in the 80's, before | |
| | pac-man fever hit the world. Clear the asteroid field by destroying all | |
| | asteroids with your missiles. Some asteroids will break into fragments. | |
| | Piloting the ship is challenging, as you will need to strategically use | |
| | thrusters and steering capabilty, while anticipating inertia in space. | |
| | | |
|'| The original asteroids game use hardware that could draw vector graphics |'|
| | ( lines, polygons, etc ). This game uses Java's Polygon and Graphics2D | |
|'| class to render Vector graphics also. The game also recycles much of the |'|
| | standard Java class library such that no new classes were needed. | |
|'| |'|
| |--[ Instructions ] | |
|'| |'|
| | 1. Press [up] to start the game from the title screen. | |
|'| 2. Press [up] to activate thrusters. |'|
| | 3. Press [left] or [right] to turn ship direction left or right. | |
| | 4. Press [spacebar] to fire missiles ( up to 3 at a time ). | |
| | | |
| | All objects, including the ship, asteroids and missiles "wrap around" | |
| | space. So when an object leaves from the top of the screen, it reappears | |
| | from the bottom. | |
| | | |
| |--[ Levels, Scoring & Extra Lives ] | |
| | | |
|'| The player earns points by destroying asteroids in the asteroid field. |'|
| | Big asteroids are worth 30 points, and small asteroids are 10 points. | |
|'| The game tracks the current score, and last highest score. |'|
| | | |
|'| When the player destroys all asteroids in field, the player goes to |'|
| | the next level. As the player gains more levels, the maximum number | |
|'| of possible asteroids in a field increases. |'|
| | | |
|'| The player earns an extra life every 1000 points earned. The number of |'|
| | lives are indicated in the top-left of the screen. | |
| | | |
| | ________________________________________ | |
| \________________/ B u i l d & I n s t a l l a t i o n \________________/ |
| | | |
| | (+) required, (-) optional | |
| | | |
| |--[ Build Requirements ] | |
| | | |
| | (+) Java2 SE SDK 1.4 or greater. Get it at <http://java.sun.com> | |
| | (+) Asteroids.java - This Java source file. | |
| | | |
| |--[ Data Files ] | |
| | | |
| | (-) explode.wav - Explosion sound sample. | |
| | (-) missile.wav - Missile sound sample. | |
|'| (-) rocket.wav - Rocket engine sound sampl |'|
| | (-) music.mid - Background music sequence | |
| | | |
|'| |'|
| |--[ Building with Java2 SDK ] | |
|'| |'|
| | 1. Build: javac Asteroids.java | |
|'| |'|
| | 2. Run: appletviewer Asteroids.javac. | |
|'| |'|
| | | |
| |--[ Installation & Embedding in a Web document ] | |
| | | |
| | 1. Upload Asteroids.class, *.wav *.mid files to a directory. | |
| | | |
| | 2. Insert the following tags inside an HTML document. | |
| | | |
| | <applet code="Asteroids.class" width="640" height="480"> </applet> | |
| | | |
| | _______________________ | |
| \________________________/ G a m e D e s i g n \_________________________/ |
| | | |
| |--[ Title Screen ] | |
| | | |
| | The title screen is kinda neat I must admit. When I played the arcade | |
| | version on MAME <http://mame.net> I noticed that the ship looked like | |
| | the letter A. So when the title fades in, the ship represents the first | |
| | letter in "Asteroids". | |
| | | |
| |--[ Asteroids ] | |
|'| |'|
| | The asteroids shapes are randomly generated. This is easily done by | |
|'| rotating each of the vertices about the center equally, and extending |'|
| | each vertex by a random distance from the centre. | |
|'| |'|
| | When an asteroid shape is generated, its initialized with a random | |
|'| velocity and is added to the asteroid field. An asteroid is added |'|
| | whenever a large asteroid is broken, or when the asteroid field is | |
|'| cleared and needs to be setup again. |'|
| | | |
| |--[ Star Field ] | |
| | | |
| | The star field is a simple animated background for the game. The stars | |
| | are created as Line2D shapes randomly placed. We rotate odd and even | |
| | numbered stars at different speeds, to give a parallax effect. Half | |
| | the stars rotate 2x faster than the other half. | |
| | | |
| |--[ The Ship ] | |
| | | |
| | The player controls the ship in deep space. Whenever the thrust button | |
| | is pressed, the ship's new velocity is calculated: | |
|'| |'|
| | if ( thrust ) | |
|'| { |'|
| | shipVelocity.x += SHIP_THRUST_SPEED * Math.cos( shipDirection ); | |
|'| shipVelocity.y += SHIP_THRUST_SPEED * Math.sin( shipDirection ); |'|
| | } | |
|'| |'|
| | The ship is modelled out of 3 polygons: The body, cockpit and thruster | |
|'| exhaust. Whenever we rotate or move the ship, we apply this to all parts |'|
| | of the ship, so they move as one object. | |
| | | |
| | When a ship hits an asteroid, it loses a life and becomes invicible for | |
| | one second, allowing the player to get to safety. We use a fade effect | |
| | to show the ship reconstituting itself. Of course when all lives are | |
| | spent, the game is over. | |
| | | |
| |--[ Missiles ] | |
| | | |
| | The ship can fire 3 missiles ( MAX_MISSILES ) at a time. The missiles | |
| | will self destruct after a while, if it doesn't sooner hit an Asteroid. | |
| | When a ship destructs, it explodes but does not make a sound. Only when | |
| | an asteroid is hit does it make an impact sound. The ship can't be | |
| | destroyed by its own missiles. | |
| | | |
| |--[ Explosions ] | |
|'| |'|
| | The explosions are actually quite simple. To explode a shape, we create | |
|'| small triangles (debris) from each segment of the shape and its centre. |'|
| | Each triangle is given a random velocity, colour and life time. As the | |
|'| life time expires, the color fades to black. |'|
| | | |
|'| When updating (moving) the debris, we also rotate even and odd artifacts |'|
| | clockwise and ant-clockwise respectively. | |
|'| |'|
| |--[ Sounds and Music ] | |
| | | |
| | The thruster sound was simply me blowing into the microphone. I then | |
| | used Audacity to cut out the part I want and tweaked the pitch and | |
| | boosted the bass. To make the sound loop, I duplicated the segment into | |
| | another channel, and reversed it. The addition of the two channels makes | |
| | a seamless sound loop. The rest came from flashkit.com. | |
| | | |
|'| The music I chose is a rare Waltz piece with a bent. Few will recognise |'|
| | this from the original SNES game Starfox. The only way you would know | |
|'| this song is if you found the "lost universe" hidden level, by crashing |'|
| | into a certain asteroid. Feel free to twirl your ship around and let | |
|'| the music take you :-P. |'|
| | | |
|'| The midi was sequenced by Master-G, who also makes other midi sequences |'|
| | from Starfox from other games at mastergzoola.tk. | |
|'| |'|
| | _____________ | |
| \_______________________________/ N o t e s \____________________________/ |
| | | |
| | | |
| |--[ Hyper Space ] | |
| | | |
| | There is no hyper-space button. In the original arcade version, you | |
| | could jump to hyper space in a tight situation and appear on a random | |
| | location on the screen. Of course there is no garuntee that where you | |
| | jump too will be any safer. I never liked this idea, so I left it as an | |
| | exercise for those using this code to learn. | |
| | | |
| | | |
| |--[ High Scores Table ] | |
| | | |
|'| Asteroids was the first game to use a high score table, where you can |'|
| | enter your initals ( I use MUJ or EYB ). I was going to impelement a | |
|'| high scores table too. But because this game is in the form of a Java |'|
| | applet, I decided that unless I implement an on-line high-scores table, | |
|'| there is little use in implementing one because it would just reset the |'|
| | next time you play. | |
|'| |'|
| | If I were to implement an online high-scores table, I would use Java's | |
|'| JDBC API to securely connect to an online SQL database, where the |'|
| | high scores table is kept. This also requires a JDBC driver, which you | |
| | would have to get from the database vendor. | |
| | | |
| |--[ Like Any Okay Design... ] | |
| | | |
| | When I began this project, I originally attempted to make the game look | |
| | like the arcade classic, with non-filled polygons and fixed set of | |
| | asteroid shapes. The final result is not at all I was planning on the | |
| | outset, but I think its okay. | |
| | | |
| | Enjoy, | |
| | | |
| | - mujtaba | |
| | _______________________ | |
| \__________________________/ o o o o o \_______________________/ |
\______________________________________________________________________________/
*/
System Requirements
Java2 plug-in or Java2 SE SDK 1.4 or greater.
Screenshots
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Unite 2010
