CODEWITHSUNDEEP
pythongis
Soscrates Fd
Soscrates Fd

Reputation: 49

How to put randomly uniform dots within a set boundary?

I am trying to put random dots I generated through the imports matplotlib and random.

I am able to generate the number of dots I need like this:

upper = 0 lower = 500

for points in range(upper, lower):
    rand_lat = random.uniform(upper, lower)
    rand_lng = random.uniform(upper, lower)
    plt.plot(rand_lat, rand_lng, 'bo')

When I run it here are the results:

enter image description here

After I've generated those points I want to contain them within set boundaries I made for the state. I have the longitude/latitudes set up from North, West, East, South as follows:

plt.plot( [-109.05,-102.05,-102.05,-109.05,-109.05], [41,41,37,37,41] )

But I need them to fit all inside a state boundary as set above. That state boundary looks like this:

enter image description here

Upvotes: 0

Views: 335

Answers (1)

Stefan Falk
Stefan Falk

Reputation: 25407

You actually have everything you need at hand already. Just do it like this:

import random
import matplotlib.pyplot as plt
import matplotlib.patches as patches

n = 1000

xlo, xhi = -109, -102
ylo, yhi = 37, 41

x_rand = [random.uniform(xlo, xhi) for _ in range(n)]
y_rand = [random.uniform(ylo, yhi) for _ in range(n)]

ax = plt.figure().gca()
ax.scatter(x_rand, y_rand, s=5)
ax.add_patch(patches.Rectangle((xlo,ylo), abs(xlo-xhi), abs(yhi-ylo), linewidth=1, 
                               edgecolor='r', facecolor='none', linestyle='--'))
plt.show()

which gives you

enter image description here

From your comments I sense you're looking for something like this:

import random
import matplotlib.pyplot as plt
import matplotlib.patches as patches

w = 1
n = 100
quadrants = [(x, y) for x in range(-1, 1) for y in range(-1, 1)]

ax = plt.figure(figsize=(8,8)).gca()

markers = ['x', '^', 'o', ',']

for marker, q in zip(markers, quadrants):

    xlo, ylo = q
    xhi, yhi = xlo+w, ylo+w

    x_rand = [random.uniform(xlo, xhi) for _ in range(n)]
    y_rand = [random.uniform(ylo, yhi) for _ in range(n)]

    ax.scatter(x_rand, y_rand, s=25, marker=marker)    
    ax.add_patch(patches.Rectangle((xlo,ylo), abs(xlo-xhi), abs(yhi-ylo), linewidth=1, 
                               edgecolor='k', facecolor='none', linestyle='--'))

enter image description here

Upvotes: 1

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