Hi, I am running Mapnik 0.6.0 on Windows XP. My data is in a SQLite
(Spatialite) database file and it is a simple linestring. When I try to
render it I get a blank map. There are no errors or warnings on the
output. Here is my script:
from mapnik import *
m = Map(800,600,"+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
m.background = Color('white')
sqlite_lyr = Layer('SQLite')
sqlite_lyr.srs = "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs"
sqlite_lyr.datasource = SQLite(file='main.db', table='tours',
key_field='ROWID', geometry_field='the_geom',
extent='-110.801,32.2257,-110.799,32.2263')
sqlite_style = Style()
sqlite_rule_on = Rule()
sqlite_rule_on.symbols.append(PolygonSymbolizer(Color(250, 190, 183)))
sqlite_style.rules.append(sqlite_rule_on)
m.append_style('test style', sqlite_style)
sqlite_lyr.styles.append('test style');
m.layers.append(sqlite_lyr)
m.zoom_to_box(Envelope(-110.801,32.2257,-110.799,32.2263))
im = Image(m.width,m.height)
render(m, im)
im.save('demo.png', 'png') # true-colour RGBA
save_map(m,"map.xml")
If I then export my data as a shapefile from the database and render
that instead, then it works. I swap the datasource line for this one:
sqlite_lyr.datasource = Shapefile(file='./shapefile', encoding='latin1')
Everything else stays the same. Can anyone please give me some hints as
to what step I might be missing or where I should look for troubleshooting?
Thanks, Andy
--
Andy
PGP Key ID: 0xDC1B5864
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