English fish
Published in
2 min readOct 26, 2017
"""Demonstrates a simple simulation of schooling/swarming behavior.This simulates a school of fish that exhibit three bottom-up behaviors:- A fish wants to move towards the center of its neighbors. This encourages them to
get cozy.
- A fish wants to move away from any fish that's encroaching on its personal space.
That is, don't get too cozy.
- A fish wants to turn towards the average direction of its neighbors. This causes
neighbors to swim in the same direction.
"""import math
import random
from behaviors import *def setup():
size(800, 500)# How many fish you want in the simulation.
number_of_fish = 100# Add all the fish behaviors and their parameters.
global behaviors
behaviors = (
MoveTowardsCenterOfNearbyFish(closeness=500.0, threshold=25.0, speedfactor=100.0, weight=20.0),
TurnAwayFromClosestFish(threshold=1.0, speedfactor=5.0, weight=900.0),
TurnToAverageDirection(closeness=50.0, weight=6.0),
Swim(speedlimit=3.0, turnratelimit=math.pi / 20.0),
WrapAroundWindowEdges()
)# Make some fish!
global allfishes
allfishes = []
for i in xrange(0, number_of_fish):
allfishes.append(Fish())def draw():
background(0,0,139)
for fish in allfishes:
fish.move()
fish.draw()class Fish(object):
fishcolors = (
color(255, 145, 8),
color(255,255,255),
color(255,192,203)
)def __init__(self):
self.position = [random.randrange(0, width), random.randrange(0, height)]
self.speed = 1
self.direction = random.random() * 2.0 * math.pi - math.pi
self.turnrate = 0self.fishcolor = Fish.fishcolors[random.randrange(0, len(Fish.fishcolors))]def move(self):
# TODO Globals... Yuck.
global allfishes, behaviorsstate = {}# TODO Make this more efficient.
for fish in allfishes:
for behavior in behaviors:
behavior.setup(self, fish, state)for behavior in behaviors:
behavior.apply(self, state)
# behavior.draw(self, state)def draw(self):
pushMatrix()translate(*self.position)
rotate(self.direction)stroke(self.fishcolor)
noFill()
bezier(0, 0, 10, 7, 15, 0, 25, 0)
bezier(0, 0, 10, -7, 15, 0, 25, 0)
line(7, 3, 12, 8)
line(7, -3, 12, -8)popMatrix()
