CS108L Spring 2014
Week 7: Sample Program 1: Saving Nemo Model
;; Saving Nemo
;; November 17 2013
;;
;; Notes:
;; 1. Deep blue is 102
;; 2. Setting the values for energy loss and gain can be confusing. Make sure that the
students do not set the initial energy
;; to greatter than the reproduction energy!
;; 3. Have the students save the model frequently because if the program gets stuck,
you may have to clode NetLogo. NetLogo
;; DOES NOT autosave and there is a likelyhood that the program will run amok
;; 4. Need to have Reset-ticks at the end of the setup procedure and tick at the end of
the go procedure
;; 5. Turning patches green during the go procedure should happen rarely (I used 1
in 1000 probability)
breed [fishes fish] ;; creating the fish breed
fishes-own [Fenergy]
;; creating the fish variable for energy
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globals [emptyWaterColor] ;; not required you can use the color number in each set
pcolor command below
to setup
clear-all
set emptyWaterColor 102 ;; 102 is deep blue - you can just use the number later if
you want
create-fishes numfish_atStart ;; creates the inital number of fish with the required
properties
[
set color red
set size 4
setxy random-xcor random-ycor
set Fenergy 10
set shape "fish"
]
ask patches ;; creates your water world with plankton
[
ifelse random 100 < 1
[
set pcolor green
]
[
set pcolor emptyWaterColor ;; can use the color number for deep blue, 102
]
]
reset-ticks ;; NEED for plotting
end
to go
ask fishes
[
FishWiggle
FishEat
FishDie
FishHatch
]
ask patches ;; create plankton rarely
[
if pcolor = emptyWaterColor ;; can use the color number for deep blue, 102
[ if random 1000 < 1
[
set pcolor green
]
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]
]
tick
end
to FishWiggle ;; fish wiggle to move and loose energy while they do that
right random 45
left random 45
forward 1
set Fenergy Fenergy - 0.1
end
to FishEat ;; Fish gain energy by eating plankton
if pcolor = green
[ set Fenergy Fenergy + 1
set pcolor emptyWaterColor ;; can use the color number for deep blue, 102
]
end
to FishHatch ;; fish have babies if their energy reaches a certain value and loose
energy if they do
if Fenergy > 15
[
set Fenergy Fenergy - 3
hatch 1
[
set Fenergy 10
forward 3
]
]
end
to FishDie ;; fish die if they have no energy
if Fenergy <= 0
[ die
]
end
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