def _get_bbox_by_tiles(tiles):
numRows = len(tiles)
numCols = len(tiles[0])
first = tiles[0][0]
last = tiles[numRows -1][numCols -1]
bbox = Bbox.from_leftdown_rightup(first.bbox.node_leftdown(), last.bbox.node_rightup())
return bbox
def getTile_byNode(self, centreNode, side_length):
centrePixel = self.get_pixel(centreNode)
x1 = centrePixel[0] - side_length/2
x2 = centrePixel[0] + side_length/2
y1 = centrePixel[1] - side_length/2
y2 = centrePixel[1] + side_length/2
img = self.image.crop((x1, y1, x2, y2))
leftDown = self.getNode((x1,y1))
rightUp = self.getNode((x2,y2))
bbox = Bbox.from_leftdown_rightup(leftDown,rightUp)
return Tile.from_tile(img,bbox)
