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directories are always sorted in ascending z,x,y order [#26]

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This commit is contained in:
Brandon Liu
2022-01-30 12:14:22 +08:00
parent 1acdab5a27
commit 1c0211602f
1 changed files with 9 additions and 0 deletions
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9
python/pmtiles/writer.py
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@@ -3,6 +3,9 @@ import itertools
import json
from contextlib import contextmanager
def tilesort(t):
return (t[0],t[1],t[2])
@contextmanager
def write(fname):
w = Writer(fname)
@@ -39,6 +42,7 @@ class Writer:
self.f.write(entry[4].to_bytes(4,byteorder='little'))
def write_leafdir(self,tiles,total_len):
tiles.sort(key=tilesort)
for t in tiles:
self.leaves.append((t[0][0],t[0][1],t[0][2],self.offset,17*total_len))
for entry in t[1]:
@@ -59,6 +63,7 @@ class Writer:
if len(self.tiles) < 21845:
self.f.seek(0)
self.write_header(metadata,len(self.tiles))
self.tiles.sort(key=tilesort)
for entry in self.tiles:
self.write_entry(entry)
else:
@@ -97,8 +102,12 @@ class Writer:
root_tiles = root[0][1]
self.f.seek(0)
self.write_header(metadata,len(root_tiles) + len(self.leaves))
root_tiles.sort(key=tilesort)
for entry in root_tiles:
self.write_entry(entry)
# the leaf level > the root tile entries
self.leaves.sort(key=tilesort)
for entry in self.leaves:
z_dir = (0b10000000 | entry[0])
self.write_entry((z_dir,entry[1],entry[2],entry[3],entry[4]))