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json_getter.py
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json_getter.py
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# -*- coding: utf-8 -*-
from twms import projections
from libkomapnik import pixel_size_at_zoom
import json
import psycopg2
from mapcss import MapCSS
import cgi
import os
import sys
reload(sys)
sys.setdefaultencoding("utf-8") # a hack to support UTF-8
try:
import psyco
psyco.full()
except ImportError:
pass
# print >>sys.stderr, "Psyco import failed. Program may run slower. If you run it on i386 machine, please install Psyco to get best performance."
def get_vectors(bbox, zoom, style, vec="polygon"):
bbox_p = projections.from4326(bbox, "EPSG:3857")
geomcolumn = "way"
database = "dbname=gis user=gis"
pxtolerance = 1.8
intscalefactor = 10000
ignore_columns = set(["way_area", "osm_id", geomcolumn, "tags", "z_order"])
table = {"polygon": "planet_osm_polygon", "line": "planet_osm_line", "point": "planet_osm_point", "coastline": "coastlines"}
a = psycopg2.connect(database)
b = a.cursor()
if vec != "coastline":
b.execute("SELECT * FROM %s LIMIT 1;" % table[vec])
names = [q[0] for q in b.description]
for i in ignore_columns:
if i in names:
names.remove(i)
names = ",".join(['"' + i + '"' for i in names])
taghint = "*"
types = {"line": "line", "polygon": "area", "point": "node"}
adp = ""
if "get_sql_hints" in dir(style):
sql_hint = style.get_sql_hints(types[vec], zoom)
adp = []
for tp in sql_hint:
add = []
for j in tp[0]:
if j not in names:
break
else:
add.append(tp[1])
if add:
add = " OR ".join(add)
add = "(" + add + ")"
adp.append(add)
adp = " OR ".join(adp)
if adp:
adp = adp.replace("<", "<")
adp = adp.replace(">", ">")
if vec == "polygon":
query = """select ST_AsGeoJSON(ST_TransScale(ST_ForceRHR(ST_Intersection(way,SetSRID('BOX3D(%s %s,%s %s)'::box3d,900913))),%s,%s,%s,%s),0) as %s,
ST_AsGeoJSON(ST_TransScale(ST_ForceRHR(ST_PointOnSurface(way)),%s,%s,%s,%s),0) as reprpoint, %s from
(select (ST_Dump(ST_Multi(ST_SimplifyPreserveTopology(ST_Buffer(way,-%s),%s)))).geom as %s, %s from
(select ST_Union(way) as %s, %s from
(select ST_Buffer(way, %s) as %s, %s from
%s
where (%s)
and way && SetSRID('BOX3D(%s %s,%s %s)'::box3d,900913)
and way_area > %s
) p
group by %s
) p
where ST_Area(way) > %s
order by ST_Area(way)
) p
""" % (bbox_p[0], bbox_p[1], bbox_p[2], bbox_p[3],
-bbox_p[0], -bbox_p[1], intscalefactor / (bbox_p[2] - bbox_p[0]), intscalefactor / (bbox_p[3] - bbox_p[1]),
geomcolumn,
-bbox_p[0], -bbox_p[1], intscalefactor / (bbox_p[2] - bbox_p[0]), intscalefactor / (bbox_p[3] - bbox_p[1]),
names,
pixel_size_at_zoom(zoom, pxtolerance), pixel_size_at_zoom(zoom, pxtolerance),
geomcolumn, names,
geomcolumn, names,
pixel_size_at_zoom(zoom, pxtolerance),
geomcolumn, names,
table[vec],
adp,
bbox_p[0], bbox_p[1], bbox_p[2], bbox_p[3],
(pixel_size_at_zoom(zoom, pxtolerance) ** 2) / pxtolerance,
names,
pixel_size_at_zoom(zoom, pxtolerance) ** 2
)
elif vec == "line":
query = """select ST_AsGeoJSON(ST_TransScale(ST_Intersection(way,SetSRID('BOX3D(%s %s,%s %s)'::box3d,900913)),%s,%s,%s,%s),0) as %s, %s from
(select (ST_Dump(ST_Multi(ST_SimplifyPreserveTopology(ST_LineMerge(way),%s)))).geom as %s, %s from
(select ST_Union(way) as %s, %s from
%s
where (%s)
and way && SetSRID('BOX3D(%s %s,%s %s)'::box3d,900913)
group by %s
) p
) p
""" % (bbox_p[0], bbox_p[1], bbox_p[2], bbox_p[3],
-bbox_p[0], -bbox_p[1], intscalefactor / (bbox_p[2] - bbox_p[0]), intscalefactor / (bbox_p[3] - bbox_p[1]),
geomcolumn, names,
pixel_size_at_zoom(zoom, pxtolerance),
geomcolumn, names,
geomcolumn, names,
table[vec],
adp,
bbox_p[0], bbox_p[1], bbox_p[2], bbox_p[3],
names,
)
elif vec == "point":
query = """select ST_AsGeoJSON(ST_TransScale(way,%s,%s,%s,%s),0) as %s, %s
from %s where
(%s)
and way && SetSRID('BOX3D(%s %s,%s %s)'::box3d,900913)
limit 10000
""" % (
-bbox_p[0], -bbox_p[1], intscalefactor / (bbox_p[2] - bbox_p[0]), intscalefactor / (bbox_p[3] - bbox_p[1]),
geomcolumn, names,
table[vec],
adp,
bbox_p[0], bbox_p[1], bbox_p[2], bbox_p[3],
)
elif vec == "coastline":
query = """select ST_AsGeoJSON(ST_TransScale(ST_ForceRHR(ST_Intersection(way,SetSRID('BOX3D(%s %s,%s %s)'::box3d,900913))),%s,%s,%s,%s),0) as %s, 'coastline' as "natural" from
(select (ST_Dump(ST_Multi(ST_SimplifyPreserveTopology(ST_Buffer(way,-%s),%s)))).geom as %s from
(select ST_Union(way) as %s from
(select ST_Buffer(SetSRID(the_geom,900913), %s) as %s from
%s
where
SetSRID(the_geom,900913) && SetSRID('BOX3D(%s %s,%s %s)'::box3d,900913)
) p
) p
where ST_Area(way) > %s
) p
""" % (bbox_p[0], bbox_p[1], bbox_p[2], bbox_p[3],
-bbox_p[0], -bbox_p[1], intscalefactor / (bbox_p[2] - bbox_p[0]), intscalefactor / (bbox_p[3] - bbox_p[1]),
geomcolumn,
pixel_size_at_zoom(zoom, pxtolerance), pixel_size_at_zoom(zoom, pxtolerance),
geomcolumn,
geomcolumn,
pixel_size_at_zoom(zoom, pxtolerance),
geomcolumn,
table[vec],
bbox_p[0], bbox_p[1], bbox_p[2], bbox_p[3],
pixel_size_at_zoom(zoom, pxtolerance) ** 2
)
# print query
a = psycopg2.connect(database)
b = a.cursor()
b.execute(query)
names = [q[0] for q in b.description]
ROWS_FETCHED = 0
polygons = []
for row in b.fetchall():
ROWS_FETCHED += 1
geom = dict(map(None, names, row))
for t in geom.keys():
if not geom[t]:
del geom[t]
geojson = json.loads(geom[geomcolumn])
del geom[geomcolumn]
if geojson["type"] == "GeometryCollection":
continue
if "reprpoint" in geom:
geojson["reprpoint"] = json.loads(geom["reprpoint"])["coordinates"]
del geom["reprpoint"]
prop = {}
for k, v in geom.iteritems():
prop[k] = v
try:
if int(v) == float(v):
prop[k] = int(v)
else:
prop[k] = float(v)
if str(prop[k]) != v: # leading zeros etc.. should be saved
prop[k] = v
except:
pass
geojson["properties"] = prop
polygons.append(geojson)
return {"bbox": bbox, "granularity": intscalefactor, "features": polygons}
print "Content-Type: text/html"
print
form = cgi.FieldStorage()
if "z" not in form:
print "need z"
exit()
if "x" not in form:
print "need x"
exit()
if "y" not in form:
print "need y"
exit()
z = int(form["z"].value)
x = int(form["x"].value)
y = int(form["y"].value)
if z > 22:
exit()
callback = "onKothicDataResponse"
bbox = projections.bbox_by_tile(z + 1, x, y, "EPSG:3857")
style = MapCSS(0, 30)
style.parse(open("styles/osmosnimki-maps.mapcss", "r").read())
zoom = z + 2
aaaa = get_vectors(bbox, zoom, style, "coastline")
aaaa["features"].extend(get_vectors(bbox, zoom, style, "polygon")["features"])
aaaa["features"].extend(get_vectors(bbox, zoom, style, "line")["features"])
aaaa["features"].extend(get_vectors(bbox, zoom, style, "point")["features"])
aaaa = callback + "(" + json.dumps(aaaa, True, False, separators=(',', ':')) + ",%s,%s,%s);" % (z, x, y)
print aaaa
dir = "/var/www/vtile/%s/%s/" % (z, x)
file = "%s.js" % y
try:
if not os.path.exists(dir):
os.makedirs(dir)
except:
pass
file = open(dir + file, "w")
file.write(aaaa)
file.flush()
file.close()