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Aoc 2019 Day 10 Problem

a guest Dec 13th, 2019 180 Never
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  1. def raytrace(location1,location2):
  2.     delta_x = location2[0] - location1[0]
  3.     delta_y = location2[1] - location1[1]
  4.  
  5.     abs_x = abs(delta_x)
  6.     abs_y = abs(delta_y)
  7.     raytracing_list = []
  8.  
  9.     try:
  10.         ratio = delta_x/delta_y
  11.     except ZeroDivisionError:
  12.         ratio = 0
  13.  
  14.     if abs_x >= abs_y:
  15.  
  16.         for i in range(abs_x + 1):
  17.             xval = i
  18.             if delta_x < 0:
  19.                 xval = -i
  20.             if abs_y != 0:
  21.                 yval = xval/ratio
  22.             else:
  23.                 yval = 0
  24.             if yval == int(yval):
  25.                 raytracing_list.append((xval,int(yval)))
  26.  
  27.     elif abs_y > abs_x:
  28.  
  29.         for i in range(abs_y + 1):
  30.             yval = i
  31.             if delta_y < 0:
  32.                 yval = -i
  33.             xval = ratio * yval
  34.             if xval == int(xval):
  35.                 raytracing_list.append( (int(xval),yval) )
  36.     return raytracing_list
  37.  
  38. def reader():
  39.  
  40.     file = open('aoc10.txt', 'r')
  41.     input = file.readlines()
  42.     file.close()
  43.  
  44.     asteroid_list = []
  45.     map_size = (len(input[0]) - 1,len(input))
  46.  
  47.     for y in range(len(input)):
  48.         for x in range(len(input[y])):
  49.             if input[y][x] == '#':
  50.                 asteroid_list.append( (x,y) )
  51.  
  52.     return asteroid_list,map_size
  53.  
  54. def check_asteroid(asteroid,asteroids,map_size):
  55.  
  56.     los = []
  57.  
  58.     for target in asteroids:
  59.         line = raytrace(asteroid,target)
  60.  
  61.         for location in line:
  62.             position = ( asteroid[0]+location[0],asteroid[1]+location[1] )
  63.             if position in asteroids and position != asteroid:
  64.                 if position not in los:
  65.                     los.append( position )
  66.                 break
  67.     return los
  68.  
  69. initial_data = reader()
  70. map_size = initial_data[-1]
  71. asteroids = initial_data[0]
  72. results = []
  73.  
  74. for asteroid in asteroids:
  75.  
  76.     checker = check_asteroid(asteroid,asteroids,map_size)
  77.     results.append(len(checker))
  78.  
  79. results.sort()
  80. print(results[-1])
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