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⚡️ Speed up method GlobalMercator.TileBounds by 69% #17

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⚡️ Speed up method GlobalMercator.TileBounds by 69% #17

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14 changes: 10 additions & 4 deletions opendm/tiles/gdal2tiles.py
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Original file line number Diff line number Diff line change
Expand Up @@ -265,10 +265,16 @@ def MetersToTile(self, mx, my, zoom):
return self.PixelsToTile(px, py)

def TileBounds(self, tx, ty, zoom):
"Returns bounds of the given tile in EPSG:3857 coordinates"

minx, miny = self.PixelsToMeters(tx*self.tileSize, ty*self.tileSize, zoom)
maxx, maxy = self.PixelsToMeters((tx+1)*self.tileSize, (ty+1)*self.tileSize, zoom)
"""Returns bounds of the given tile in EPSG:3857 coordinates"""
# Since PixelToMeters just multiplies and subtracts, we can save redundant
# operations by reusing res for all 4 edges.
ts = self.tileSize
res = self.Resolution(zoom)
ox = self.originShift
minx = tx * ts * res - ox
miny = ty * ts * res - ox
maxx = (tx + 1) * ts * res - ox
maxy = (ty + 1) * ts * res - ox
return (minx, miny, maxx, maxy)

def TileLatLonBounds(self, tx, ty, zoom):
Expand Down