From: Roman Bazalevskiy <rvb@rvb.name>
Date: Wed, 1 Nov 2023 08:14:19 +0000 (+0300)
Subject: В Ubuntu 22.04 сломали проекции в Mapnik, приходится использовать альтернативный... 
X-Git-Url: https://git.rvb.name/pyrungps.git/commitdiff_plain/69331b34dff92d2544e71327c319c1ff9e9b9b5e

В Ubuntu 22.04 сломали проекции в Mapnik, приходится использовать альтернативный вариант
---

diff --git a/pyrungps/generate_image.py b/pyrungps/generate_image.py
index 6e1fa3a..4a75e11 100644
--- a/pyrungps/generate_image.py
+++ b/pyrungps/generate_image.py
@@ -9,14 +9,16 @@ from optparse import OptionParser
 
 from pprint import pprint
 
-import pyrungps.pygpx
+from pyrungps.pygpx import GPX
+
+from pyproj import Transformer
 
 # Set up projections
 # spherical mercator (most common target map projection of osm data imported with osm2pgsql)
-merc = mapnik.Projection('+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over')
+#merc = mapnik.Projection('+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs +over')
 
 # long/lat in degrees, aka ESPG:4326 and "WGS 84" 
-longlat = mapnik.Projection('+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs')
+#longlat = mapnik.Projection('+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs')
 # can also be constructed as:
 #longlat = mapnik.Projection('+init=epsg:4326')
 
@@ -31,7 +33,7 @@ def render_map(mapfile,map_uri,gpx_file,imgx,imgy):
       data = f.read()
 
     xml = etree.fromstring(data)
-    gpx = pygpx.GPX()
+    gpx = GPX()
     gpx.ReadTree(xml)
 
     bbox = gpx.bound_box()
@@ -51,14 +53,24 @@ def render_map(mapfile,map_uri,gpx_file,imgx,imgy):
     m.background = mapnik.Color('rgb(255,255,255)')
     
     # ensure the target map projection is mercator
-    m.srs = merc.params()
+    #m.srs = merc.params()
 
     bbox = mapnik.Box2d(*bounds)
 
     pprint(bbox)
+   
+    minlat = bbox.miny
+    maxlat = bbox.maxy
+    minlon = bbox.minx
+    maxlon = bbox.maxx
 
-    transform = mapnik.ProjTransform(longlat,merc)
-    merc_bbox = transform.forward(bbox)
+    print(minlat,maxlat,minlon,maxlon)
+    
+    transformer = Transformer.from_crs("EPSG:4326", "EPSG:3857", always_xy=True)
+    minP=transformer.transform(minlon,minlat)
+    maxP=transformer.transform(maxlon,maxlat)
+    
+    merc_bbox = mapnik.Box2d(minP[0],minP[1],maxP[0],maxP[1])
     m.zoom_to_box(merc_bbox)
 
     style = mapnik.Style()