UFO Abducts Sheep

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UFO Abducts Sheep!

• By Tracy Ke

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Game Slide
3
Game Theme

• You are a hungry bunch of aliens aboard a UFO
  Fleet searching for food on planet earth. You
  find yourself over a pasture of roaming sheep!
  Viola! Dinnertime!
• The object of the game is for you to capture as
  many sheep as possible for dinner.
• However, its not going to be that easy

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Game Theme (cont.)

• You must avoid the German Shepherds, guardians of
  Sheep. If you capture a German Shepherd, you will
  likely garner the unwanted attention of UFO
  Hunters.
• UFO Hunters are roaming the pasture, waiting to
  shoot you down. Their silver bullets do serious
  damage to your ship. Avoid them at all costs!

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Game Design

• The object of the game is to get as many points
  as possible by capturing as many sheep as
  possible while avoiding German Shepherds and
  dodging the UFO Shooters bullets.
• Capture Sheep 20 points
• Accidentally capture Shepherds -20 points
• Hit by UFO Shooters bullets -10 points
• Time You have 15 seconds to accomplish your task
  of capturing sheep.

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Game Design (cont.)

• There are Three Levels
• Level 1 No UFO Shooters. Sheep and Shepherds
  move slowly.
• Level 2 3 UFO Shooters shooting at a moderate
  pace. Sheep and Shepherds move quickly
• Level 3 3 UFO Shooters shooting very quickly.
  Many bullets. Sheep and Shepherds move very
  quickly.

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Game Design (cont.)

• One Player Game
• If you have over 100 after the most difficult
  level, Level 3, you WIN and a Animated Splash
  Screen comes up.
• Otherwise, GAME OVER!
• MultiPlayer Game
• Score Sprite keeps track of the game score of
  each player through each successive level.
• The player with the highest score at the end of 3
  Levels WINS!

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Technical Overview

• SheepLoop extends GameLoop.
• SheepLoop is based on Jams PongLoop class.
• Other Borrowed Classes (non-gaming engine)
• (1) TimeUpdater Wackadot
• (2) ProjectileTracker PongLoop
• (3) HorizontalScrollTracker Modified from the
  VerticalScrollTracker from SimpleScroller.

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Sprites

• UFO, UFO Shadow (Array)
• Sheep (Array)
• SpinSheep (ArrayList)
• Shepherd (Array)
• SpinShepherd (ArrayList)
• UFO Shooters (Array)
• UFO Shooters Bullets (ArrayList)
• Walls (invisible)
• Scrolling Cloud Background
• Static Grass Background

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Sprite Enhancements

• Sheep, Shepherds, and Shooters are assigned
  random starting velocities.
• Spaced evenly along a line at the start of game.
  However, they are allowed to move before the game
  starts (SplashScreen).
• Projectile Tracker
• Sheep, Shepherds and Shooters bounce off of each
  other and then the velocities change when they
  bounce.

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Sprite Rotation Enhancement

• Once captured, the Sheep and Shepherds rotate and
  shrink as they are sucked up by the UFOs.
• When the frame is advanced, the velocity of the
  spinning sheep and shepherds is updated to point
  towards the current UFO Location.

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Image Enhancements

• UFO Shadow is made transparent by changing the
  Alpha Value of RGB-A.
• Sprite Backgrounds are made transparent with
  Photoshop (Thanks Chris).
• UFO shadow moves further away from the UFO as you
  move the mouse UP, and closer to the UFO as you
  move your mouse DOWN.
• Creates an illusion of depth.

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Image Enhancements (cont.)

• Multiple Players
• Each player has a different colored UFO Shadow
  (for up to 4 players)
• Created by making an Array of Shadow Colors.
• Score Sprite
• Each player has a different colored Score Sprite
  to match his/her shadow.
• The players score is indicated on his screen as
  My Score

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Animated Splash Screens

• Each new level is announced by a Splash Screen
  that tells what level it is.
• The level is the StringSprite.
• The end of the game is announced either by
  Winner or Game Over.
• SplashSprite rotates and gets bigger.
• At Time1 sec, SplashSprite stops spinning but
  keeps getting bigger.

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Audio Files Added

• Sheep captured ? BAA
• German Shepherds captured ? BARK
• UFO Shooters shoot bullets ? LASER
• UFO collision with bullets ? GUNSHOT

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Background

• Scrolling Backgrounds
• Cloud.jpg (SimpleScroller Example)
• Grass.jpg (Scroller Example)
• Score counter (Implemented from Pong)
• Multiple score indexes for MultiPlayer Game.
• Timer (Implemented from Wackadot)

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Background Enhancements

• Illusion of 3D created by dividing up the frame
  into 2 parts
• The sheep can only move about in the bottom third
  of the screen while the UFO can only move in the
  upper 2/3s.
• Walls made invisible by placing the background
  splash screens over the lines.
• Walls made thick enough to guard against sheep,
  shepherds and shooters escaping.

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Collisions

• Handle Collisions
• Detects the collision of sheep and/or shepherds
  with the shadow when the Mouse is clicked.
• Detects the collision of bullets with UFO.
• Once there is a collision, the sheep and/or
  shepherds spiral up towards the UFO and shrink.
• Once the sheep/shepherds collide with the UFO,
  they disappear.
• UFO Shooters shoot bullets randomly at the UFO
• Bullets disappear when they collide with the UFO
  or leave the canvas.

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JavaDoc

• JavaDoc
• All Classes and Methods commented.
• Parameters explained.
• Return values explained.
• getShadowLocation
• The position of the shadow
• Purpose of methods explained.
• Demonstration of Game
• User Instructions
• Applet embedded in the webpage.

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Original Timeline

• November 7th Design of video game classes,
  methods, and theme.
• November 14th Implementation of basic game
• November 21st Testing/Debugging
• December 1st Documentation
• December 7th Enhancements
• December 11th Release

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Revised Timeline

• Nov. 7th (1) Game theme created (2) Basic
  classes implemented (3) Basic Methods
  constructed.
• Nov. 14th (1) Basic sprites and image added as
  arrays and enhancements created. (2) Audio files
  added.
• November 21st (1) Testing/Debugging.
• Dec. 1st (1) Networking the game (2) Networked
  Applets linked to website.
• Dec. 7th (1) Documentation. JavaDoc generated
  and all classes and methods commented and
  authored.
• Dec. 11th (1) Creating the presentation
  balancing descriptive need with technical need.
  (2) Making sure all comments are accurate and
  descriptive.

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TimeLine Comparison

• I accomplished all that I set out to do in my
  original timeline.
• The game has the basic functionality I described.
• Documentation done after the enhancements were
  added.
• I made more enhancements than I originally set
  out to.

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Extra Enhancements

• Multiplayer Game Networked Applets.
• Spinning Sheep and Shepherds chasing UFO.
• Different player colors for UFO Shadows and
  ScoreSprites.
• Scrolling Background
• Different levels of difficulty with additional
  bullets and higher speeds.

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Debugging

• Flashing Sprites
• An issue with the version of the Gaming Engine
• The new version did not have this bug.
• Score Sprites
• The Score Sprites would not remember the score
  after each level.
• Had to remove a Score0 statement that was being
  called every time a new level started.

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Debugging (cont.)

• Applet
• There were also problems with getting a
  functional applet on the website, making sure
  that the applet tags were accurate.
• I had to look at Jams sample games to get the
  correct applet Tag.
• JavaDoc
• There were problems with the JavaDoc after I
  renamed instead of refracted the folder from
  pong to sheep.
• I had to refresh and update all the instances of
  pong in the file to make it match sheep.

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Possible Additional Enhancements

• Adding Music to the Background
• Although then the sounds might be too
  overwhelming.
• Adding Artificial Intelligence
• i.e. Making the sheep move radially from the
  shadow at a slower rate than the UFO can move.

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Grading Criteria

• Game Functionality 240 points
• Most basic game functions entirely correctly
  100 points
• Graphics are implemented 20 points
• Collisions completely work 20 points
• Trackers are attached and functional 20 points
• Mouse control implemented 20 points
• Score and Timer 20 points

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Grading Enhancements Simple

• Several Enhancements 50/50
• Sprite Enhancements 20 points
• Sound Effects 10 points
• Background Enhancements 10 points
• Collision Enhancements 10 points
• Bullets disappear from screen after it leaves the
  canvas, freeing up memory.

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Grading Enhancements Complex

• Complex Enhancements 90/50
• Rotating and Shrinking ImageSprites 10 points
• Sprites Chasing UFO 10 points
• Score Sprite Enhancements 20 points
• Game Networking 40 points
• Rotational Splash Screens 10 points

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Grading Javadoc

• Javadoc 100/100 points
• Every class is authored 20/20 points
• Every class is commented 20/20 points
• Method comments 60/60 points.
• Parameters explained 20/20 points
• Return values explained 20/20 points
• Purpose of method explained 20/20 points

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Grading Webpage

• Webpage 100/100 point
• Functional Applet link 30/30 points
• Help Screen 25/25
• Javadoc link 15/15 points
• Game progress proposal links 30/30 points

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Total Grading

• Javadoc 100/100
• Webpage 100/100
• Game Functionality 240/200
• TOTAL 440/400 (110)