Procedural art: Clouds
My first original piece of generative art inspired by a pretty sunset last night. The texture of the clouds is achieved by overlaying transparent ellipses.
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import Ellipse
Overlay small ellipses, control the color depending on the height.
def draw_cloud(x,y,ax,numiter=50):
colorful = True
r = np.random.random()
if r> 0.5:
colorful = False
# Center the cloud at x, y
xra = [x-50,x+50]
yra = [y-25, y+25]
# Sample width depending on how "dense" you
# want the cloud to appear. More dense, wider
# less dense, narrower clouds.
wi = [10, np.random.uniform(15,5*(numiter/10))]
hi = [5, np.random.uniform(7,10)]
colors = ['#edb2d0', # pink
'#a6a9ab' # gray
]
for i in range(numiter):
# sample the center of the patch
yc = np.random.uniform(yra[0], yra[1])
xc = np.random.uniform(xra[0], xra[1])
h = np.random.uniform(hi[0], hi[1])
# Make the width narrower as you go up the cloud.
w = np.random.uniform(wi[0],wi[0]+ wi[1]*(y+25-yc)/(y+25))
if colorful:
c = colors[0]
# Clouds become gray towards the top with some prob.
if yc > y:
coin = np.random.random()
if coin > (yc)/(y+25):
c = colors[1]
else:
# draw a gray cloud
c = colors[1]
# Draw the ellipse
e = Ellipse(xy=(xc,yc),
width=w,
height=h,
alpha=0.1,
edgecolor=None,
facecolor=c)
ax.add_patch(e)
Display
plt.close()
sky = '#8fcceb'#'#a2d9f5' #'#5fafed' #
f, ax = plt.subplots(1,1,figsize=(10,5), facecolor=sky)
####################
# Parameters
num_clouds = 10
canvasx = 200
canvasy = 100
####################
for i in range(num_clouds):
draw_cloud(int(np.random.uniform(-canvasx, canvasx)),
int(np.random.uniform(-canvasy, canvasy)),
ax,
numiter=int(np.random.uniform(100,500)))
ax.set_xlim([-canvasx,canvasx])
ax.set_ylim([-canvasy,canvasy])
ax.axis('off')
plt.tight_layout()
plt.savefig('clouds.png', facecolor=f.get_facecolor(), transparent=True)
