1. Weds, Nov. 26th Reading: Section Handout
CSE 142: More Critters!
Weds, Nov. 26th
Reading: Section Handout

2. Today’s Agenda
Review ideas behind Critter assignment, answer questions
Practice writing Critters
Critters will also be on the final!

3. CritterMain the Game Master
Role of CritterMain
Think of CritterMain as Game Master
Does the behind the scenes work to administer the game
Constructs your Critters, places them in the world for you
What the Game Master does you do NOT have to implement!!
You create the Critter classes, which are like players in the game
CritterMain the Game Master

4. Review of CritterMain CritterMain
The Game Master takes your settings and uses them to create and populate the Critter World – you just feed him the blueprint of your critters + settings and he does the rest
CritterMain

5. Role of CritterMain, 2 Game Master also runs each “move” of the game
Every Critter’s “move” is executed during a tick
Game = Sequence of ticks
Moves the critters, runs battles, figures out who’s napping/mating/eating, etc
Must prompt each Critter:
Tell me what you look like (toString(), getColor()), Tell me where you want to go to next (getMove())
If on a food, calls eat()
If in a fight, calls fight()

6. What’s your next move? L
In one tick, the Game Master goes to each Critter on the board and asks for their next move, appearance, etc…

7. After he talks to everyone… …he runs fights, updates scores, and updates critters’ locations, colors, etc. accordingly

8. Programming a Critter
Our job is to program Critters: we decide how a Critter behaves when CritterMain calls its methods
How it moves, how it eats, etc.
Behavior often dependent on things the Critter has to “remember” so we also give Critters state

9. A Simple Critter: Rabbit
Method
Behavior
Constructor
public Rabbit()
Color
dark gray (Color.DARK_GRAY)
Eating
alternates between true and false (true, false, true, ...)
Fighting
if opponent is a Lion, then scratch; otherwise, roar
Movement
2 N, 2 S, 2 E, repeat
toString
"V"

10. Rabbit movement

11. Rabbit movement 3 2 4 5 1 6

12. A complex Critter: Snake
Method
Behavior
Constructor
public Snake()
Color
(red=20, green=50, blue=128)
Eating
Never eats
Fighting
Randomly choose to roar or pounce
Movement
1 E, 1 S; 2 W, 1 S; 3 E, 1 S; 4 W, 1 S; 5 E, ...
toString
Always returns "S"