generate_cmaps.py

#    Copyright (c) 2021 John Champagne (johnchampagne97@gmail.com)
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# generate_cmaps.py 

# Generates a .c file with all of the default color maps in matplotlib

import numpy as np
import matplotlib.pyplot as plt
from matplotlib import cm


color_names = plt.colormaps()
fout = open("all_cmaps.c", "w")
for color_name in color_names:
    viridis = cm.get_cmap(color_name)
    
    def get_color(x):
        return tuple([int(np.round(y*255.0)) for y in viridis(x)[0:3]])
    
    
    fout.write("uint8_t cmap_" + color_name + "[256][3] = { \n")
    
    for i in range(256):
        new_line = True if i % 5 == 0 else False
        c = get_color(i / 255.0)
        fout.write(("        " if new_line else "") + "{")
        fout.write("{},{},{}".format(c[0],c[1],c[2]))
        fout.write("}")
        if i != 255:
            new_line = True if (i+1) % 5 == 0 else False
            if new_line:
                fout.write(",\n")
            else:
                fout.write(",")
        else:
            fout.write("};\n\n")
fout.close()