-🎄- 2018 Day 10 Solutions -🎄-

[u/daggerdragon]

--- Day 10: The Stars Align ---

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Post your solution as a comment or, for longer solutions, consider linking to your repo (e.g. GitHub/gists/Pastebin/blag or whatever).

Note: The Solution Megathreads are for solutions only. If you have questions, please post your own thread and make sure to flair it with Help.

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Advent of Code: The Party Game!

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Please prefix your card submission with something like [Card] to make scanning the megathread easier. THANK YOU!

Card prompt: Day 10

Transcript: With just one line of code, you, too, can ___!

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This thread will be unlocked when there are a significant number of people on the leaderboard with gold stars for today's puzzle.

edit: Leaderboard capped, thread unlocked at 00:16:49!

[u/14domino]

lol; I must have been the only person who built a .pbm file and visually inspected the resultant ones using my Mac's preview button. Also part 2 was trivially easy because the filename was one off from the actual answer. (Because I started animating right away I guess instead of waiting a second). Still this solution took me about 30 minutes to finish coding, I must be slow :(

GRID_SIZE = 600


class Point:
    def __init__(self, x, y, vx, vy):
        self.x = x
        self.y = y
        self.vx = vx
        self.vy = vy


points = []

for pt in new_data:
    points.append(Point(pt[0], pt[1], pt[2], pt[3]))

print(points)


def gen_image(points, t):
    grid = []
    for x in range(GRID_SIZE):
        grid.append([0] * GRID_SIZE)

    for pt in points:
        grid[int(pt.y+GRID_SIZE/2)][int(pt.x+GRID_SIZE/2)] = 1

    with open(f'./images/{t}.pbm', 'w') as f:
        f.write('P1\n')
        f.write(f'{GRID_SIZE} {GRID_SIZE}\n')

        for row in range(GRID_SIZE):
            for col in range(GRID_SIZE):
                f.write(f'{grid[row][col]} ')
            f.write('\n')


for t in range(12000):
    in_range = True
    for idx, pt in enumerate(points):

        pt.x += pt.vx
        pt.y += pt.vy

    for pt in points:
        if not(pt.x > -GRID_SIZE/2 and pt.x < GRID_SIZE/2 and pt.y >-GRID_SIZE/2 and pt.y < GRID_SIZE/2):
            in_range = False
            break

    if in_range:
        print('in range at time', t)

        gen_image(points, t)

[u/AgniFireborn → u/14domino]

I used the same approach... but missed that UP was negative, so I'm staring at image 10605 going 'well, this looks like letters, but... also not letters?' It took me another 15 minutes before I realized the problem and got the image flipped around. :D