src/manual.py

   1 """Manual grid selection module"""
   2
   3 import pygame
   4 import ImageDraw
   5 from math import sqrt, acos, copysign
   6
   7 from geometry import l2ad, line, intersection
   8
   9 class UserQuitError(Exception):
  10     pass
  11
  12 class Screen:
  13     # TODO isn't this a duplicate of something?
  14     def __init__(self, res):
  15         pygame.init()
  16         pygame.display.set_mode(res)
  17         pygame.display.set_caption("Imago manual mode")
  18         self._screen = pygame.display.get_surface()
  19
  20     def display_picture(self, img):
  21         pg_img = pygame.image.frombuffer(img.tostring(), img.size, img.mode)
  22         self._screen.blit(pg_img, (0, 0))
  23         pygame.display.flip()
  24
  25 def find_lines(im_orig):
  26     # TODO rename, refactor, comment
  27
  28     im = im_orig.copy()
  29
  30     screen = Screen(im.size)
  31
  32     clock = pygame.time.Clock()
  33     draw = ImageDraw.Draw(im)
  34     hoshi = lambda c: draw.ellipse((c[0] - 1, c[1] - 1, c[0] + 1, c[1] + 1),
  35                  fill=(255, 64, 64))
  36     corners = []
  37     color = (64, 64, 255)
  38     line_width = 1
  39     lines_r = []
  40
  41     while True:
  42         for event in pygame.event.get():
  43             if event.type == pygame.QUIT or event.type == pygame.KEYDOWN:
  44                 pygame.quit()
  45                 if len(corners) == 4:
  46                     return lines_r
  47                 else:
  48                     raise UserQuitError
  49             if event.type == pygame.MOUSEBUTTONDOWN:
  50                 if len(corners) >= 4:
  51                     corners = []
  52                     im = im_orig.copy()
  53                     draw = ImageDraw.Draw(im)
  54
  55                 if len(corners) < 4:
  56                     corners.append(pygame.mouse.get_pos())
  57                     draw.point(corners[:-1], fill=color)
  58                     if len(corners) == 4:
  59                         l_vert, l_hor = lines(corners)
  60                         for l in l_vert:
  61                             draw.line(l, fill=color, width=line_width)
  62                         for l in l_hor:
  63                             draw.line(l, fill=color, width=line_width)
  64                         # TODO sort by distance
  65                         l_vert.sort()
  66                         l_hor.sort()
  67                         for i in [3, 9, 15]:
  68                             for j in [3, 9, 15]:
  69                                 hoshi(intersection(line(l_vert[i][0], l_vert[i][1]),
  70                                                    line(l_hor[j][0], l_hor[j][1])))
  71                         lines_r = [[l2ad(l, im.size) for l in l_vert],
  72                                    [l2ad(l, im.size) for l in l_hor]]
  73
  74         screen.display_picture(im)
  75         clock.tick(15)
  76
  77 def lines(corners):
  78     # TODO Error on triangle
  79     cor_d = [(corners[0], (c[0] - corners[0][0], c[1] - corners[0][1]), c) for c in
  80              corners[1:]]
  81     cor_d = [(float(a[0] * b[0] + a[1] * b[1]) / (sqrt(a[0] ** 2 + a[1] ** 2) *
  82               sqrt(b[0] **2 + b[1] ** 2)), a[0] * b[1] - b[0] * a[1], c) for a, b, c in cor_d]
  83     cor_d = sorted([(copysign(acos(min(a, 1)), b), c) for a, b, c in cor_d])
  84     corners = [corners[0]] + [c for _, c in cor_d]
  85     return (_lines(corners, 0) + [(corners[0], corners[3]),
  86                                   (corners[1], corners[2])],
  87             _lines(corners[1:4] + [corners[0]], 0) +
  88             [(corners[0], corners[1]), (corners[2], corners[3])])
  89
  90 def _lines(corners, n):
  91     # TODO what is this?
  92     if n == 0:
  93         x = half_line(corners)
  94         return (_lines([corners[0], x[0], x[1], corners[3]], n + 1) + [x] +
  95                 _lines([x[0], corners[1], corners[2], x[1]], n + 1))
  96     else:
  97         x = half_line(corners)
  98         c = intersection(line(x[0], corners[2]), line(corners[1], corners[3]))
  99         d = intersection(line(corners[0], corners[3]), line(corners[1], corners[2]))
 100         if d:
 101             l = (intersection(line(corners[0], corners[1]), line(c, d)),
 102                  intersection(line(corners[2], corners[3]), line(c, d)))
 103         else:
 104             lx = line(c, (c[0] + corners[0][0] - corners[3][0],
 105                       c[1] + corners[0][1] - corners[3][1]))
 106             l = (intersection(line(corners[0], corners[1]), lx),
 107                  intersection(line(corners[2], corners[3]), lx))
 108         l2 = half_line([corners[0], l[0], l[1], corners[3]])
 109         if n == 1:
 110             return ([l, l2] + _lines([l[0], l2[0], l2[1], l[1]], 2)
 111                     + _lines([corners[0], l2[0], l2[1], corners[3]], 2)
 112                     + _lines([l[0], corners[1], corners[2], l[1]], 2))
 113         if n == 2:
 114             return [l, l2]
 115
 116
 117 def half_line(corners):
 118     # TODO what is this?
 119     c = center(corners)
 120     d = intersection(line(corners[0], corners[3]), line(corners[1], corners[2]))
 121     if d:
 122         l = line(c, d)
 123     else:
 124         l = line(c, (c[0] + corners[0][0] - corners[3][0],
 125                      c[1] + corners[0][1] - corners[3][1]))
 126     p1 = intersection(l, line(corners[0], corners[1]))
 127     p2 = intersection(l, line(corners[2], corners[3]))
 128     return (p1, p2)
 129
 130 def center(corners):
 131     """Given a list of four corner points, return the center of the square."""
 132     return intersection(line(corners[0], corners[2]),
 133                         line(corners[1], corners[3]))