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August 23, 2024 04:57
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Generate a dragon curve
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| # -*- coding: utf-8 -*- | |
| """ | |
| Generate a dragon curve | |
| @author: Nicolás Guarín-Zapata | |
| @date: July 2024 | |
| """ | |
| import os | |
| import numpy as np | |
| import matplotlib.pyplot as plt | |
| from PIL import Image | |
| def save_gif_PIL(outfile, files, fps=5, loop=0): | |
| """Helper function for saving GIFs | |
| Parameters | |
| ---------- | |
| outfile : string | |
| Path to the output file. | |
| files : list | |
| List of paths with the PNG files. | |
| fps : int (optional) | |
| Frames per second. | |
| loop : int | |
| The number of times the GIF should loop. | |
| 0 means that it will loop forever. | |
| """ | |
| imgs = [Image.open(file) for file in files] | |
| imgs[0].save(fp=outfile, format='GIF', append_images=imgs[1:], | |
| save_all=True, duration=int(1000/fps), loop=loop) | |
| repo = "https://raw.githubusercontent.com/nicoguaro/matplotlib_styles/master" | |
| style = repo + "/styles/neon.mplstyle" | |
| plt.style.use(style) | |
| col1 = "#04D9D9" | |
| col2 = "#F241A3" | |
| np.random.seed(3) | |
| A = 0.5*np.array([ | |
| [1, -1], | |
| [1, 1]]) | |
| plt.figure(figsize=(8,5)) | |
| x0 = np.random.normal(0, 1, 2) | |
| niter = 15000 | |
| files = [] | |
| for cont in range(niter): | |
| x1 = A @ x0 | |
| x2 = A @ x0 + np.array([1, 0]) | |
| plt.plot(*x1.T, ".", alpha=0.4, color=col1, mec=None, mfc=col1, markersize=2) | |
| plt.plot(*x2.T, ".", alpha=0.4, color=col2, mec=None, mfc=col2, markersize=2) | |
| pick = np.random.randint(0, 2) | |
| if pick: | |
| x0 = x1.copy() | |
| else: | |
| x0 = x2.copy() | |
| if cont % 500 == 0: | |
| file = f"dragon_curve{str(cont).zfill(5)}.png" | |
| plt.axis("image") | |
| plt.xlim(-0.75, 1.75) | |
| plt.ylim(-0.5, 1.5) | |
| plt.axis("off") | |
| plt.savefig(file, dpi=300) | |
| files.append(file) | |
| # plt.show() | |
| save_gif_PIL("dragon_curve_anim.gif", files, fps=5, loop=0) | |
| [os.remove(file) for file in files] |
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