Dias nummer 1

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Bumper Cow Racing
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• Præsentation
• Bumpercow racing
• Gruppen
• Proof of concept

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• Spil programmering
• Hvad vs. Hvordan
• Konceptet
• MDA (Rules - System - Fun)
• Systemisk design

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• Arbejdsprocessen
• Hvad har vi gjort?
• Hvad har været godt?
• Hvad har været dårligt?

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• Tim Ryan
• Mark Cerny
• Extreme programming

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• Metaphor
• Onsite Customer
• Continuous Integration
• Simple Design
• Pair Programming
• Collective Code Ownership

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• Gode ting
• Bedre kode?
• Ingen eksperter
• Fremtiden

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• Dårlige ting
• Kode strukturen tog tid
• Ingen eksperter

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• Sprogvalg
• 5 mand, 2 nye sprog, 1 ny game engine
• Ønske om at alle skal kunne bidrage
• Prioritet Fælles forståelse, struktur, features
• og optimering af run-time performance
• Python frem for C
• Ulempe Stort pres på taskmanageren
• Fordel Renere struktur, alle har kunnet bidrage

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• Object factory
• Fleksibilitet i objekt instansiering
• Instansiering af objekter run-time
• Skabe struktur særligt i vores start klasse
• Interface pattern

Track currentTrack globalvars.factory.createInst
ance("track01") Model m currentTrack.getModel
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class Track01(track.Track) Track
properties modelPath "/Build_final/models/tr
ack/bane01group" trackModel ""
trackScale 20 trackName "Track01"
collisionList "/curb1","/road","/ring1","
/ring2","/ring3","/ring4","/ring5","/rin
g6" def setBitMasks(self, nodeList, bit)
sets up bitmasks for collision objects in the
collisionList i 1 for x in
nodeList tmpNode
self.getTrackModel().find(x)
globalvars.collision.setBitmask(tmpNode, bit)
def getTrackModel(self) . def
getModelPath(self) . def
getWayPoints(self) .. . . def
createTrack() return Track01() globalvars.fa
ctory.registerClass("track01",createTrack)
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• OO og globale variable
• Indkapsling af data
• Mulighed for deling
• Inspireret fra eksisterende spil
• OO og singletons
• Python og script

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This file contains a series of global
variables for easy accessibility in
different parts of the program.

import objectfactory from
collisiondetection import CollisionDetection Set
up a reference to the global ObjectFactory factor
y objectfactory.Instance Set up a reference
to the global CollisionDetection system collision
CollisionDetection() Set up reference to the
current track object currentTrack "" Set up
reference to the current player car player1Car
"" aiCarNumber 0
Default car properties
carMaxForwardSpeed 34 carMaxReverseSpeed
-15 carAcceleration 0.6 carFriction
0.2 carTurnSpeed 1.4
Start class self.car
globalvars.factory.createInstance("playercar") sel
f.car.setCarName("playercar") globalvars.player1Ca
r self.car
Car class Setup car in
the scene self.car.setPos( globalvars.currentTrac
k.startPosX, globalvars.currentTrack.startPosY,
globalvars.currentTrack.startPosZ ) self.car.setHp
r(globalvars.currentTrack.startHPR,0,0)

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• AI
• Pathfinding waypoint
• Finite State Machine
• Neural Network

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• Collision Detection
• PhysicsCollisionHandler vs CollisionHandler
• Broad collision
• Narrow collision
• Bitmask

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• Konklusion / Vejen Frem
• To Mål
• God objekt orienteret kode
• Godt spil design (sjovt at spille)

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• God objekt orienteret kode
• First pass (i spillet)
• Oprydning i koden
• Klasse struktur

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• God objekt orienteret kode
• Second pass (for fremtiden)
• Model-View-Controller
• Revider klasserne
• Adskil den visuelle representation fra input
  håndtering og spil/model states
• Definer kommunikations linier/data flow
• Eksempel

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• God objekt orienteret kode

CarController
GetSpeed() GetDirection() .....
Controller
Look at
CarRepresentation
CarEntity
Look at
DrawCar() PlayEngineSound() .....
GetPosition() CollisionResponce() ApplyForce()
.....
View
Model
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• Store linjer
• Holdsammensætning
• Proof of concept

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Q A