advent-of-code/2021/python/day13.py

90 lines
2.5 KiB
Python

import scanf
import itertools
import matrix
from matrix import ppmx as pmx
import numpy as np
import pandas as pd
import shared
from pprint import pprint as pp
class Oragami:
def __init__(self, name):
lines = []
with open(name, "r") as f:
for line in f.readlines():
lines.append(line.rstrip())
splitter = lines.index("")
coords, folds = lines[:splitter], lines[splitter + 1 :]
self.coords = [list(map(int, c.split(","))) for c in coords]
print(self.coords[:6])
self.parse_folds(folds)
self.max()
self.new_matrix()
def parse_folds(self, folds):
self.folds = []
for fold in folds:
axis, index = scanf.scanf("fold along %s=%d", fold)
self.folds.append({'axis':axis, 'index':index})
def max(self):
by_x = max([x['index'] for x in self.folds if x['axis'] == 'x'])
by_y = max([x['index'] for x in self.folds if x['axis'] == 'y'])
self.max_width = by_x*2+1
self.max_height = by_y*2+1
def new_matrix(self):
self.matrix = matrix.matrix_of_size(width=self.max_width, height=self.max_height)
for c, r in self.coords:
self.matrix[r][c] = 1
def process_folds(self):
for idx, fold in enumerate(self.folds):
print('---')
if fold['axis'] == 'y':
self.fold_y(fold['index'])
else:
self.fold_x(fold['index'])
self.count()
pmx(self.matrix,pad=False,space=False)
def fold_y(self, cut):
#folding on y removes the y row
bottom = self.matrix[cut+1:]
bottom = list(reversed(bottom))
self.matrix = self.matrix[:cut]
self.copy_from(bottom)
def fold_x(self, cut):
#folding on X removes the x column
left, right = [], []
removed = 0
for r, row in enumerate(self.matrix):
left.append(row[:cut])
right.append(list(reversed(row[cut+1:])))
if row[cut] == 1:
removed += 1
self.matrix = left
self.copy_from(right)
def copy_from(self, source):
for r, row in enumerate(source):
for c, col in enumerate(row):
if col == 1:
self.matrix[r][c] = 1
print("")
def count(self):
flat = np.ravel(np.array(self.matrix))
print(sum(flat))
def main():
o = Oragami(shared.get_fname(13))
o.process_folds()
if __name__ == "__main__":
main()