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# perey/codegolf_stars.py

Created July 16, 2015 08:02
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"The Colors in Our Stars" Code Golf Challenge
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 #!/usr/bin/env python3 """Pretty star picture maker. This is the ungolfed version. http://codegolf.stackexchange.com/questions/53124/the-colors-in-our-stars """ from collections import namedtuple from math import floor, sqrt CHANNEL_DEPTH = 8 CHANNEL_MAX = 2 ** CHANNEL_DEPTH - 1 Star = namedtuple('Star', 'x y intensity red green blue') def dist_euclid(x1, y1, x2, y2): """Calculate the Euclidean distance between two points.""" dx = x1 - x2 dy = y1 - y2 return sqrt(dx ** 2 + dy ** 2) def dist_manhattan(x1, y1, x2, y2): """Calculate the Manhattan distance between two points.""" dx = x1 - x2 dy = y1 - y2 return abs(dx) + abs(dy) def parse_input(i): """Read the input format to get image dimensions and stars.""" lines = iter(i) width, height = (int(coord) for coord in next(lines).split()) stars = [] for line in lines: stars.append(Star(*(int(val) for val in line.split()))) return width, height, stars def pixel(x, y, stars, dist_fn=dist_euclid): """Calculate the colour values at a given pixel.""" for channel in ('red', 'green', 'blue'): yield min(floor(sum((star.intensity * getattr(star, channel) / (dist_fn(star.x, star.y, x, y) + 1)) for star in stars)), CHANNEL_MAX) def make_image(infile, outfile, dist_fn=dist_euclid): """Create the star image.""" print('P3', file=outfile) width, height, stars = parse_input(infile) print(width, height, CHANNEL_MAX, file=outfile) for y in range(height): for x in range(width): print(' '.join(str(channel) for channel in pixel(x, y, stars, dist_fn)), file=outfile) if __name__ == '__main__': infile = '''400 400 123 231 5 206 119 85 358 316 5 170 47 99 95 317 5 202 42 78 251 269 5 142 150 153 43 120 5 145 75 61 109 376 5 230 231 52 331 78 5 31 81 126 150 330 5 8 142 23 69 155 5 142 251 199 218 335 5 183 248 241 204 237 5 112 253 34 342 89 5 140 11 123'''.splitlines() with open('test.pnm', 'w') as outfile: make_image(infile, outfile, dist_manhattan)
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 from sys import stdin as f o,m,r=print,map,range w,h=m(int,f.readline().split()) S=[list(m(int,l.split())) for l in f] p=lambda x,y:(min(int(sum((I*C[c]/(abs(X-x)+abs(Y-y)+1))for X,Y,I,*C in S)),255)for c in r(3)) o('P3',w,h,255) for y in r(h): for x in r(w): o(' '.join(m(str,p(x,y))))
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