class FittingBbox:
def __init__(self, zoom_level=19):
self._mercator = GlobalMercator()
self._zoom_level = zoom_level
def get(self, bbox):
t_minx, t_miny, t_maxx, t_maxy = self.bbox_to_tiles(bbox)
bbox = self._bbox_from(t_minx, t_miny, t_maxx, t_maxy)
return bbox
def bbox_to_tiles(self, bbox):
m_minx, m_miny = self._mercator.LatLonToMeters(bbox.bottom, bbox.left)
m_maxx, m_maxy = self._mercator.LatLonToMeters(bbox.top, bbox.right)
t_maxx, t_maxy = self._mercator.MetersToTile(m_maxx, m_maxy,
self._zoom_level)
t_minx, t_miny = self._mercator.MetersToTile(m_minx, m_miny,
self._zoom_level)
return t_minx, t_miny, t_maxx, t_maxy
def generate_bbox(self, tx, ty):
bottom, left, top, right = self._mercator.TileLatLonBounds(
tx, ty, self._zoom_level)
bbox = Bbox.from_lbrt(left, bottom, right, top)
return bbox
def _bbox_from(self, t_minx, t_miny, t_maxx, t_maxy):
bottom, left, _, _ = self._mercator.TileLatLonBounds(
t_minx, t_miny, self._zoom_level)
_, _, top, right = self._mercator.TileLatLonBounds(
t_maxx, t_maxy, self._zoom_level)
return Bbox.from_lbrt(left, bottom, right, top)
class OtherApi:
def __init__(self, zoom_level=19):
self._mercator = GlobalMercator()
self._zoom_level = zoom_level
self.tile = None
def get_image(self, bbox):
t_minx, t_miny, t_maxx, t_maxy = self._bbox_to_tile_indexes(bbox)
images = self._download_images(t_minx, t_miny, t_maxx, t_maxy)
image_matrix = self._to_image_matrix(images, t_minx, t_miny, t_maxx, t_maxy)
image = self._to_image(image_matrix)
big_bbox = self._generate_bbox(t_minx, t_miny, t_maxx, t_maxy)
self.tile = Tile(image, big_bbox)
return self._crop(self.tile, bbox)
@staticmethod
def _to_image_matrix(images, t_minx, t_miny, t_maxx, t_maxy):
image_matrix = []
row = 0
url_number = 0
for ty in range(t_miny, t_maxy + 1):
image_matrix.append([])
for tx in range(t_minx, t_maxx + 1):
image = images[url_number]
image_matrix[row].append(image)
url_number += 1
row += 1
return image_matrix
def _download_images(self, t_minx, t_miny, t_maxx, t_maxy):
url_builder = UrlBuilder(self._zoom_level)
urls = url_builder.get_urls_by_tiles(t_minx, t_miny, t_maxx, t_maxy)
loader = MultiLoader(urls)
loader.download()
return loader.results
@staticmethod
def _to_image(image_matrix):
num_rows = len(image_matrix)
num_cols = len(image_matrix[0])
width, height = image_matrix[0][0].size
result = Image.new("RGB", (num_cols * width, num_rows * height))
for y in range(0, num_rows):
for x in range(0, num_cols):
result.paste(image_matrix[y][x], (x * width, (num_rows - 1 - y) * height))
return result
def _bbox_to_tile_indexes(self, bbox):
m_minx, m_miny = self._mercator.LatLonToMeters(bbox.bottom, bbox.left)
m_maxx, m_maxy = self._mercator.LatLonToMeters(bbox.top, bbox.right)
t_maxx, t_maxy = self._mercator.MetersToTile(m_maxx, m_maxy, self._zoom_level)
t_minx, t_miny = self._mercator.MetersToTile(m_minx, m_miny, self._zoom_level)
return t_minx, t_miny, t_maxx, t_maxy
def _generate_bbox(self, t_minx, t_miny, t_maxx, t_maxy):
bottom, left, _, _ = self._mercator.TileLatLonBounds(t_minx, t_miny, self._zoom_level)
_, _, top, right = self._mercator.TileLatLonBounds(t_maxx, t_maxy, self._zoom_level)
return Bbox(left=left, bottom=bottom, right=right, top=top)
@staticmethod
def _crop(tile, bbox):
left, bottom = tile.get_pixel(bbox.node_left_down())
right, top = tile.get_pixel(bbox.node_right_up())
box = (left, top, right, bottom)
cropped_image = tile.image.crop(box)
image = Image.frombytes(mode='RGB', data=cropped_image.tobytes(), size=cropped_image.size)
return image