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Object Oriented Design

Object Oriented Design. Goals. Discussion Pacman Project Project X: OOA & D meets AI Collaborating objects Objects approaching / or pretending to have complexity of human beings. Pacman reflections. Specification in UML How hard was it?

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Object Oriented Design

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  1. Object Oriented Design

  2. Goals • Discussion Pacman Project • Project X: OOA & D meets AI • Collaborating objects • Objects approaching / or pretending to have complexity of human beings

  3. Pacman reflections • Specification in UML • How hard was it? • How complete was the specification? Could somebody else implement it?

  4. How to implement Ghost.move? the big question

  5. Object interaction complexity • 1970s • Frogger: simple causality: truck hits frog • Space Invaders: indirect causality: Defender shoots laser, laser hits spaceship • 1980s • Pacman: early AI: tracking, avoiding, of objects. E.g., ghosts track the pacman • 1990/2000s • Simulation of human intentions, goals, emotions, communication, … name that game

  6. Homework 6 • Design and implement in AgentSheets • Individual projects • Due: Oct. 22

  7. Diffusion and Hill Climbing • The presence of an agent can be diffused through space allowing other agents to track agent via hill climbing • The landscape can be shaped to provide navigation clues

  8. Solution: combine hill climbing with diffusion • Powerful idea: • applicable to a huge number of OO design problems • A cognitive tool to think about complex problems • Origins • Hill climbing: Artificial Intelligence • Diffusion: Physics • Combination => Distributed Artificial Intelligence

  9. How to spread continuous values: Diffusion • Value := (value[left] + value[right] + value[up] + value[down]) / 4 • Examples • Temperature • voltage • Presence

  10. Examples of Diffusion • Bridge Builder • Avalanche / mudslide • Electric Diffusion • Electric Ink • Heat Diffusion

  11. Example

  12. Asymmetric Diffusion • Diffusion coefficients representing asymmetric diffusion can be introduced to model... • Water flow (El Nîno) • Wind (Sustainopolis) • Value := 1/n ∑ui * valuei

  13. Example 1: fire sim

  14. Homework 6 • Design and implement in AgentSheets • Individual projects • Due: Oct. 22

  15. Background • Created in 2000 by Will Wright at Maxis, an Electronic Arts company • Grew out of series of simulation games including: SimCity (also created by Will in 1989), SimAnt, SimTower, SimEarth, … • Info: http://www.thesims.com/

  16. Description

  17. Turn in • Project • Sims living in house or outside • At least 2 kinds of diffusions • Objects to satisfy basic needs • Hunger • Thirst • Sleep • Objects / people to satisfy secondary needs • Entertainment • Comfort • Documentation • Same naming conventions and guidelines as usual

  18. … and use “4448” as part of your email subject line!!

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