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Refactoring the boids #1

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Refactoring the boids #1

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098dc95
changed variable names
bwan1 Dec 8, 2022
68954d6
Merged repeated for loops
bwan1 Dec 8, 2022
daf3051
Input changed for ease of testing
bwan1 Dec 8, 2022
604ace2
Removed unused imports
bwan1 Dec 8, 2022
ca2eb0a
Stored results from repeated calcs into variables
bwan1 Dec 8, 2022
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69 changes: 37 additions & 32 deletions boids/boids.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,39 +5,44 @@
This code simulates the swarming behaviour of bird-like objects ("boids").
"""

from matplotlib import pyplot as plt
from matplotlib import animation
#import random

import random
# boids_x = [random.uniform(-450, 50.0) for x in range(50)]
# boids_y = [random.uniform(300.0, 600.0) for x in range(50)]
# boid_x_velocities = [random.uniform(0, 10.0) for x in range(50)]
# boid_y_velocities = [random.uniform(-20.0, 20.0) for x in range(50)]
# boids = (boids_x, boids_y, boid_x_velocities, boid_y_velocities)

boids_x=[random.uniform(-450,50.0) for x in range(50)]
boids_y=[random.uniform(300.0,600.0) for x in range(50)]
boid_x_velocities=[random.uniform(0,10.0) for x in range(50)]
boid_y_velocities=[random.uniform(-20.0,20.0) for x in range(50)]
boids=(boids_x,boids_y,boid_x_velocities,boid_y_velocities)
boids_x = [-300.0, 20.0, 3.0]
boids_y = [420, 480, 540]
boids_x_velocities = [1.0, 2.0, 7.0]
boids_y_velocities = [-15.0, 10.0, 15.0]
boids = (boids_x, boids_y, boids_x_velocities, boids_y_velocities)

def update_boids(boids):
xs,ys,xvs,yvs=boids
# Fly towards the middle
for i in range(len(xs)):
for j in range(len(xs)):
xvs[i]=xvs[i]+(xs[j]-xs[i])*0.01/len(xs)
for i in range(len(xs)):
for j in range(len(xs)):
yvs[i]=yvs[i]+(ys[j]-ys[i])*0.01/len(xs)
# Fly away from nearby boids
for i in range(len(xs)):
for j in range(len(xs)):
if (xs[j]-xs[i])**2 + (ys[j]-ys[i])**2 < 100:
xvs[i]=xvs[i]+(xs[i]-xs[j])
yvs[i]=yvs[i]+(ys[i]-ys[j])
# Try to match speed with nearby boids
for i in range(len(xs)):
for j in range(len(xs)):
if (xs[j]-xs[i])**2 + (ys[j]-ys[i])**2 < 10000:
xvs[i]=xvs[i]+(xvs[j]-xvs[i])*0.125/len(xs)
yvs[i]=yvs[i]+(yvs[j]-yvs[i])*0.125/len(xs)
# Move according to velocities
for i in range(len(xs)):
xs[i]=xs[i]+xvs[i]
ys[i]=ys[i]+yvs[i]
x_pos, y_pos, x_vel, y_vel = boids
number_of_boids = len(x_pos)

for i in range(number_of_boids):
for j in range(number_of_boids):
diff_x = x_pos[j] - x_pos[i]
diff_y = y_pos[j] - y_pos[i]
# Fly towards the middle
x_vel[i] = x_vel[i] + (diff_x) * 0.01 / number_of_boids
y_vel[i] = y_vel[i] + (diff_y) * 0.01 / number_of_boids
# Fly away from nearby boids
if (diff_x) ** 2 + (diff_y) ** 2 < 100:
x_vel[i] = x_vel[i] + (diff_x)
y_vel[i] = y_vel[i] + (diff_y)
# Try to match speed with nearby boids
if (diff_x) ** 2 + (diff_y) ** 2 < 10000:
x_vel[i] = x_vel[i] + (x_vel[j] - x_vel[i]) * 0.125 / number_of_boids
y_vel[i] = y_vel[i] + (y_vel[j] - y_vel[i]) * 0.125 / number_of_boids
# Move according to velocities
x_pos[i] = x_pos[i] + x_vel[i]
y_pos[i] = y_pos[i] + y_vel[i]

print(x_pos, y_pos, x_vel, y_vel)

update_boids(boids)
print("hi")