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bad-boids/boids.py at master · UCL-ARC-RSEing-with-Python/bad-boids · GitHub
UCL-ARC-RSEing-with-Python
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boids.py
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boids.py
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"""
A deliberately bad implementation of [Boids](http://dl.acm.org/citation.cfm?doid=37401.37406)
for use as an exercise on refactoring.
"""
from
matplotlib
import
pyplot
as
plt
from
matplotlib
import
animation
import
random
# Deliberately terrible code for teaching purposes
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
)
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
]
figure
=
plt
.
figure
()
axes
=
plt
.
axes
(
xlim
=
(
-
500
,
1500
),
ylim
=
(
-
500
,
1500
))
scatter
=
axes
.
scatter
(
boids
[
0
],
boids
[
1
])
def
animate
(
frame
):
update_boids
(
boids
)
scatter
.
set_offsets
(
list
(
zip
(
boids
[
0
],
boids
[
1
])))
anim
=
animation
.
FuncAnimation
(
figure
,
animate
,
frames
=
50
,
interval
=
50
)
if
__name__
==
"__main__"
:
plt
.
show
()
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