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June 5, 2019 09:47
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#!/usr/bin/env python | |
from PIL import Image, ImageDraw | |
original_points = [[[1912, 197]],[[1909, 209]],[[1906, 220]],[[1891, 274]],[[1878, 318]],[[1863, 367]],[[1852, 402]],[[1841, 436]],[[1826, 482]],[[1820, 500]],[[1793, 578]],[[1782, 609]],[[1757, 678]],[[1741, 722]],[[1717, 787]],[[1694, 848]],[[1652, 958]],[[1626, 1025]],[[1624, 1029]],[[1623, 1030]],[[1608, 1031]],[[1552, 1033]],[[1522, 1034]],[[1478, 1035]],[[1419, 1036]],[[531, 1044]],[[314, 1044]],[[294, 1043]],[[293, 1042]],[[292, 1040]],[[284, 1019]],[[263, 962]],[[211, 817]],[[201, 789]],[[189, 755]],[[175, 715]],[[167, 692]],[[154, 654]],[[120, 552]],[[108, 515]],[[98, 484]],[[92, 465]],[[87, 449]],[[71, 397]],[[61, 364]],[[56, 347]],[[38, 284]],[[33, 266]],[[25, 237]],[[21, 222]],[[16, 203]],[[10, 180]],[[10, 176]],[[19, 175]],[[45, 173]],[[73, 171]],[[103, 169]],[[121, 168]],[[184, 165]],[[207, 164]],[[262, 162]],[[294, 161]],[[334, 160]],[[387, 159]],[[509, 158]],[[541, 158]],[[1424, 161]],[[1492, 162]],[[1542, 163]],[[1583, 164]],[[1619, 165]],[[1646, 166]],[[1694, 168]],[[1716, 169]],[[1737, 170]],[[1755, 171]],[[1790, 173]],[[1806, 174]],[[1836, 176]],[[1864, 178]],[[1877, 179]],[[1889, 180]],[[1893, 181]],[[1907, 188]],[[1912, 191]]] | |
def aproximate_rectangle(points): | |
def _get_dimensions(points): | |
dimensions = [ | |
[points[0][0], points[0][0]], | |
[points[0][1], points[0][1]] | |
] | |
for p in points: | |
if p[0] < dimensions[0][0]: | |
dimensions[0][0] = p[0] | |
if p[0] > dimensions[0][1]: | |
dimensions[0][1] = p[0] | |
if p[1] < dimensions[1][0]: | |
dimensions[1][0] = p[1] | |
if p[1] > dimensions[1][1]: | |
dimensions[1][1] = p[1] | |
return dimensions | |
def _get_size(dimensions): | |
return { | |
'width': dimensions[0][1]-dimensions[0][0], | |
'height': dimensions[1][1]-dimensions[1][0] | |
} | |
def _get_center_point(dimensions): | |
return { | |
'x': dimensions[0][1] / 2 - dimensions[0][0] / 2, | |
'y': dimensions[1][1] / 2 - dimensions[1][0] / 2 | |
} | |
def _slice_by_zones(zones, points): | |
""" | |
Рассовывем точки на четыре зоны: левая верхняя, левая нижняя, | |
правая верхняя и правая нижняя для рассчета площади треугольника в каждой из них | |
""" | |
for p in points: | |
if p[0] < center_point['x']: | |
if p[1] < center_point['y']: | |
zones['tl'].append(p) | |
else: | |
zones['bl'].append(p) | |
if p[0] > center_point['x']: | |
if p[1] < center_point['y']: | |
zones['tr'].append(p) | |
else: | |
zones['br'].append(p) | |
return zones | |
def _triangle_area(point_1=(), point_2=(), point_3=()): | |
return abs( | |
0.5*(point_1[0]*(point_2[1]-point_3[1])+point_2[0] * | |
(point_3[1]-point_1[1])+point_3[0]*(point_1[1]-point_2[1])) | |
) | |
dimensions = _get_dimensions(points) # структура такая — (x0, x1, y0, y1) | |
size = _get_size(dimensions) | |
center_point = _get_center_point(dimensions) | |
zones = { | |
'tl': [], | |
'tr': [], | |
'bl': [], | |
'br': [] | |
} | |
final_coordinates = { | |
'tl': None, | |
'tr': None, | |
'br': None, | |
'bl': None | |
} | |
# получаем четыре зоны | |
zones = _slice_by_zones(zones, original_points) | |
# вычисляем габариты каждой зоны | |
zones_dimensions = { zone: _get_dimensions(zones[zone]) for zone in zones.keys()} | |
# это вершины треугольника внутри каждой зоны, две вершины мы берем из габаритов самого треугольника, | |
# третью будем вычислять | |
vertex_by_zone = { | |
'tl': ( | |
(zones_dimensions['tr'][0][0], zones_dimensions['tr'][1][1]), | |
(zones_dimensions['tr'][0][1], zones_dimensions['tr'][1][0]) | |
), | |
'tr': ( | |
(zones_dimensions['tr'][0][0], zones_dimensions['tr'][1][0]), | |
(zones_dimensions['tr'][0][1], zones_dimensions['tr'][1][1]) | |
), | |
'bl': ( | |
(zones_dimensions['bl'][0][0], zones_dimensions['bl'][1][0]), | |
(zones_dimensions['bl'][0][1], zones_dimensions['bl'][1][1]) | |
), | |
'br': ( | |
(zones_dimensions['br'][0][0], zones_dimensions['br'][1][1]), | |
(zones_dimensions['br'][0][1], zones_dimensions['br'][1][0]) | |
) | |
} | |
# считаем площадь для треугольников в каждой секции | |
zones_areas = {} | |
for zone in zones.keys(): | |
for p in zones[zone]: | |
if zones_areas.get(zone, None) is None: | |
zones_areas[zone] = {} | |
zones_areas[zone][_triangle_area(vertex_by_zone[zone][0], vertex_by_zone[zone][1], p)] = p | |
# вычисляем итоговые координаты крайних точек трапеции | |
final_coordinates = { | |
zone: zones_areas[zone][sorted(zones_areas[zone], reverse=True)[0]] \ | |
for zone in final_coordinates.keys() | |
} | |
return list((coord for coord in final_coordinates.values())) | |
def draw_rectangle(points, im=None, color=(255, 255, 255, 100)): | |
if not im: | |
im = Image.new('RGBA', (1920, 1280), (0, 0, 0, 100)) | |
draw = ImageDraw.Draw(im) | |
draw.polygon(points, fill=color, outline=color) | |
return im | |
if __name__ == "__main__": | |
original_points = list(map(lambda x: (x[0][0], x[0][1]), original_points)) | |
points = aproximate_rectangle(original_points) | |
im = draw_rectangle(original_points) # рендерим оригинальный набор точек | |
im = draw_rectangle(points, im=im, color=(255, 0, 0, 20)) # рендерим апроксимированный результат | |
im.save("./rectange.png", "PNG") | |
print(points) |
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