From 0f58e0f39a33de394b4792feb55701a3c13d6e5b Mon Sep 17 00:00:00 2001
From: Roman Bazalevsky <rvb@rvb.name>
Date: Sat, 30 Jan 2016 00:15:22 +0300
Subject: [PATCH 1/1] =?utf8?q?=D0=98=D1=81=D0=BA=D1=83=D1=81=D1=81=D1=82?=
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---
 render_tiles.py | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/render_tiles.py b/render_tiles.py
index 3d95a85..18432d3 100644
--- a/render_tiles.py
+++ b/render_tiles.py
@@ -13,6 +13,13 @@ def queue_render(db,filename,forced_max_zoom=None):
   cur.execute("select minlat,minlon,maxlat,maxlon from tracks where filename=?" , (filename.decode('UTF-8'),))
   minlat,minlon,maxlat,maxlon=cur.fetchone()
   queue_tiles(db,minlat,minlon,maxlat,maxlon,forced_max_zoom)
+
+def deg2num(lat_deg, lon_deg, zoom):
+  lat_rad = math.radians(lat_deg)
+  n = 2.0 ** zoom
+  xtile = int((lon_deg + 180.0) / 360.0 * n)
+  ytile = int((1.0 - math.log(math.tan(lat_rad) + (1 / math.cos(lat_rad))) / math.pi) / 2.0 * n)
+  return (xtile, ytile)
             
 def queue_tiles(db,minlat,minlon,maxlat,maxlon,forced_max_zoom=None):
 
@@ -21,10 +28,19 @@ def queue_tiles(db,minlat,minlon,maxlat,maxlon,forced_max_zoom=None):
   # определяем примерный стартовый зум
   
   minzoom=8
+
   if forced_max_zoom:
     maxzoom=forced_max_zoom
   else:
-    maxzoom=16  
+    maxzoom=minzoom
+    while True:
+      minx,miny=deg2num(minlat,minlon,maxzoom)
+      maxx,maxy=deg2num(maxlat,maxlon,maxzoom)
+      print maxzoom,':',minx,'-',maxx,'/',miny,'-',maxy
+      if (maxx-minx>32) or (maxy-miny>24) or (maxzoom==16):
+        break
+      else:
+        maxzoom=maxzoom+1   
   
   ins = conn.cursor()
   print minlat,maxlat,minlon,maxlon,minzoom,maxzoom
-- 
2.34.1