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@smitec
Created January 13, 2014 20:15
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Generate tile-able (in 1 direction) mountains. Useful for game backgrounds.
import random
import Image
def fractal_mountain(pixels, damping, seed=0.0):
px = [seed, seed]
factor = 1.0;
while(len(px) < pixels):
# loop through and generate
new_p = []
for i in range(1, len(px)):
r = 2*random.random() - 1;
new_p = new_p + [min(abs((px[i] + px[i-1])/2.0 + r*factor),1.0)]
factor = factor * damping
px_new = []
for i in range(len(px)-1):
px_new = px_new + [px[i]] + [new_p[i]]
px_new = px_new + [px[-1]]
px = px_new
return px
def generate_mountain(sz, damping, seed):
im = Image.new("RGBA", sz, (0, 0, 0, 0))
px = im.load()
d = fractal_mountain(sz[0], damping, seed)
d = d[:sz[0]]
for i in range(sz[0]):
r = d[i]*sz[1]
for j in range(int(r)):
px[i,(sz[1] - 1) - j] = (0,0,0,255)
return im
if __name__ == "__main__":
random.seed()
for i in range(3):
for j in range(2):
im = generate_mountain((512,256), 0.5 - 0.05*i, 0.4)
im.save("./output_" + str(i) + "_" + str(j) + ".png")
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