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geotools2mapnik.py
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geotools2mapnik.py
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#!/usr/bin/env python
import os
import sys
import optparse
import tempfile
import shlex
import logging
import mapnik2 as mapnik
from lxml import etree
from lxml import objectify
log = logging.getLogger(__name__)
FIX_HEX = False
def proj4_from_osr(shp_dir):
from osgeo import osr
srs = osr.SpatialReference()
try:
prj_file = open(shp_dir+ '.prj','r').read()
except IOError:
return None
srs.SetFromUserInput(prj_file)
proj4 = srs.ExportToProj4()
if not proj4:
#ERROR 6: No translation for Lambert_Conformal_Conic to PROJ.4 format is known.
srs.MorphFromESRI()
proj4 = srs.ExportToProj4()
if proj4:
return proj4
else:
return None
def rgb_to_hex(triplet):
return '#%02x%02x%02x' % triplet
def is_number(s):
""" Test if the value can be converted to a number.
"""
try:
if str(s).startswith('0'):
return False
float(s)
return True
except ValueError:
return False
def name2expr(sym):
name = sym.attrib['name']
expression = '[%s]' % name
sym.attrib['name'] = expression
def fixup_pointsym(sym):
if sym.attrib.get('width'):
sym.attrib.pop('width')
if sym.attrib.get('height'):
sym.attrib.pop('height')
#if sym.attrib.get('type'):
# sym.attrib.pop('type')
def get_cap(cap):
if cap == 'square':
return mapnik.line_cap.SQUARE_CAP
if cap == 'flat':
return mapnik.line_cap.BUTT_CAP
else:
return mapnik.line_cap.ROUND_CAP
def get_join(join):
if join == 'bevel':
return mapnik.line_join.BEVEL_JOIN
elif join == 'round':
return mapnik.line_join.ROUND_JOIN
else:
return mapnik.line_join.MITER_JOIN
def _ogc_filter_to_expression(prop):
if 'And' in prop.tag:
return ' and '.join(map(_ogc_filter_to_expression,
prop.iterchildren()))
elif 'Or' in prop.tag:
return ' or '.join(map(_ogc_filter_to_expression,
prop.iterchildren()))
elif 'PropertyIsGreaterThan' in prop.tag:
return _compile_bin_op('>', prop.iterchildren())
elif 'PropertyIsLessThan' in prop.tag:
return _compile_bin_op('<', prop.iterchildren())
elif 'PropertyIsEqualTo' in prop.tag:
return _compile_bin_op('=', prop.iterchildren())
elif 'PropertyIsNotEqualTo' in prop.tag:
return _compile_bin_op('!=', prop.iterchildren())
elif 'PropertyIsBetween' in prop.tag:
name = prop.PropertyName
cql_lo = _compile_bin_op('>', [name, prop.LowerBoundary.Literal])
cql_hi = _compile_bin_op('<', [name, prop.UpperBoundary.Literal])
return cql_lo + 'and ' + cql_hi
raise AssertionError(etree.tounicode(prop, pretty_print=True))
def _compile_bin_op(operator, arg_nodes):
ops = map(_translate_literal_or_property_name, arg_nodes)
assert len(ops)==2
return "%s %s %s" % (ops[0], operator, ops[1])
def _translate_literal_or_property_name(e):
if 'Literal' in e.tag:
if is_number(e.text):
return "%s"%e.text
else:
return "'%s'"%e.text
elif 'PropertyName' in e.tag:
return "[%s]" % e.text
raise AssertionError
def ogc_filter_to_mapnik(ogc_filter):
cql = _ogc_filter_to_expression(ogc_filter.getchildren()[0])
if mapnik.mapnik_version() >= 800:
return mapnik.Expression(str(cql))
else:
return mapnik.Filter(str(cql))
def stroke_to_mapnik(stroke):
m_stroke = mapnik.Stroke()
for css in stroke.CssParameter:
if css.get('name') == 'stroke':
m_stroke.color = mapnik.Color(css.text)
elif css.get('name') == 'stroke-width':
m_stroke.width = float(css.text)
elif css.get('name') == 'stroke-opacity':
m_stroke.opacity = float(css.text)
elif css.get('name') == 'stroke-dasharray':
dashes = map(float, css.text.strip().split(' '))
assert len(dashes)%2==0, dashes
for i in xrange(0, len(dashes), 2):
m_stroke.add_dash(dashes[i], dashes[i+1])
elif css.get('name') == 'stroke-linecap':
m_stroke.line_cap = get_cap(css.text)
elif css.get('name') == 'stroke-join':
m_stroke.line_join = get_join(css.text)
elif css.get('name') == 'stroke-linejoin':
m_stroke.line_join = get_join(css.text)
elif css.get('name') == 'stroke-dashoffset':
m_stroke.dash_offset = float(css.text)
else:
raise Exception('unhanded: ' + css.get('name'))
return m_stroke
def fix_colors(tree):
if hasattr(tree,'Style'):
for style in tree.Style:
if len(style.Rule):
for rule in style.Rule:
for child in rule.iterchildren():
if child.tag.endswith('Symbolizer'):
items = child.items()
for i in items:
if len(i) == 2:
name,value = i
if str(value).startswith('rgb('):
c = mapnik.Color(value)
triplet = (c.r,c.g,c.b)
child.set(name,rgb_to_hex(triplet))
def main(root,**options):
m = mapnik.Map(1,1)
datasource = options.get('datasource')
if datasource and datasource.endswith('shp'):
shp_dir = os.path.abspath(datasource).split('.shp')[0]
name = datasource.split('.shp')[0]
datasource = mapnik.Shapefile(file=shp_dir)
if srid is not None:
m.srs = '+init=epsg:%s' % srid
else:
srs = proj4_from_osr(shp_dir)
if srs:
m.srs = srs
layers = []
if hasattr(root,'NamedLayer'):
layers.extend(root.NamedLayer)
if hasattr(root,'UserLayer'):
layers.extend(root.UserLayer)
for layer in layers:
m_layer, styles = ogc_layer_to_mapnik(layer)
for (name, style) in styles:
m.append_style(name, style)
if datasource:
m_layer.datasource = datasource
m_layer.srs = m.srs
m.layers.append(m_layer)
if FIX_HEX:
(handle, path) = tempfile.mkstemp(suffix='.xml', prefix='geotools2mapnik-')
os.close(handle)
open(path,'w').write(mapnik.save_map_to_string(m))
tree = objectify.parse(path)
fix_colors(tree)
print etree.tostring(tree)#,pretty_print=True)
else:
print mapnik.save_map_to_string(m)
def ogc_layer_to_mapnik(layer):
idx = 0
m_layer = mapnik.Layer(str(getattr(layer,'Name',None) or 'Layer'))
styles = []
for user_style in layer.UserStyle:
for feature_style in user_style.FeatureTypeStyle:
m_sty = mapnik.Style()
# TODO = Styles should have title,abstract, etc...
sty_name = getattr(feature_style,'Name',None)
if not sty_name:
sty_name = '%s %s' % (m_layer.name,str(idx))
sty_name = str(sty_name)
for rule in feature_style.Rule:
#print rule.get_childen()
m_rule = ogc_rule_to_mapnik(rule)
m_sty.rules.append(m_rule)
m_layer.styles.append(sty_name)
styles.append((sty_name, m_sty))
idx+= 1
return m_layer, styles
def ogc_rule_to_mapnik(rule):
m_rule = mapnik.Rule(str(getattr(rule,'Name','')))
ogc_filter = rule.find("{%s}Filter" % rule.nsmap['ogc'])
if ogc_filter is not None:
m_rule.filter = ogc_filter_to_mapnik(ogc_filter)
else:
if hasattr(rule,'ElseFilter'):
m_rule.set_else(True)
if hasattr(rule,'MaxScaleDenominator'):
m_rule.max_scale = float(rule.MaxScaleDenominator)
if hasattr(rule,'MinScaleDenominator'):
m_rule.min_scale = float(rule.MinScaleDenominator)
syms = []
for possible_sym in rule.iterchildren():
if 'Symbolizer' in possible_sym.tag:
translator = get_translator(possible_sym)
if translator:
syms.extend(translator(possible_sym))
else:
log.warn("Could not translate symbolizer '%s'",
possible_sym.tag)
for sym in syms:
m_rule.symbols.append(sym)
return m_rule
_translators = {}
def translates_sld(tag):
def wrap(func):
_translators[_sld_tag(tag)] = func
return func
return wrap
def _sld_tag(name):
return "{http://www.opengis.net/sld}"+name
def get_translator(node):
return _translators.get(node.tag)
@translates_sld('LineSymbolizer')
def ogc_LineSymbolyzer_to_mapnik(sym):
stroke = sym.Stroke
m_stroke = stroke_to_mapnik(stroke)
yield mapnik.LineSymbolizer(m_stroke)
@translates_sld('PolygonSymbolizer')
def ogc_PolygonSymbolizer_to_mapnik(sym):
m_poly = mapnik.PolygonSymbolizer()
if hasattr(sym,'Fill'):
fill = sym.Fill
for css in fill.CssParameter:
if css.get('name') == 'fill':
m_poly.fill = mapnik.Color(css.text)
elif css.get('name') == 'fill-opacity':
m_poly.opacity = float(css.text)
else:
raise Exception('unhanded: ' + css.get('name'))
if hasattr(sym,'Stroke'):
stroke = sym.Stroke
m_stroke = stroke_to_mapnik(stroke)
yield mapnik.LineSymbolizer(m_stroke)
yield m_poly
@translates_sld('PointSymbolizer')
def ogc_PointSymbolizer_to_mapnik(sym):
#fill = rule.PolygonSymbolizer.Fill
#m_point = point_to_mapnik(point)
# TODO
yield mapnik.PointSymbolizer()
@translates_sld('TextSymbolizer')
def ogc_TextSymbolizer_to_mapnik(text):
name = text.Label.find("{%s}PropertyName" % rule.nsmap['ogc'])
if not name and hasattr(text,'Label'):
name = shlex.split(str(text.Label))[0]
#face_name = '[%s]' % text.Font
face_name = 'DejaVu Sans Book'
size = 10
for css in text.Font.CssParameter:
if css.get('name') == 'font-family':
face_name = css.text
elif css.get('name') == 'font-size':
size = int(float(css.text))
color = mapnik.Color('black')
for css in text.Fill.CssParameter:
if css.get('name') == 'fill':
color = mapnik.Color(css.text)
m_text = mapnik.TextSymbolizer(
mapnik.Expression('[%s]'%name),str(face_name), int(size), color)
if hasattr(text,'LabelPlacement'):
if hasattr(text.LabelPlacement,'LinePlacement'):
m_text.label_placement = mapnik.label_placement.LINE_PLACEMENT
if hasattr(text,'Halo'):
h = text.Halo
if hasattr(h,'Radius'):
m_text.halo_radius = float(h.Radius)
if hasattr(h,'Fill'):
for css in h.Fill.CssParameter:
if css.get('name') == 'fill':
m_text.halo_fill = mapnik.Color(css.text)
yield m_text
@translates_sld('RasterSymbolizer')
def ogc_RasterSymbolizer_to_mapnik(sym):
if hasattr(sym, 'ColorMap'):
m_sym = mapnik.RasterSymbolizer()
type = sym.ColorMap.attrib.get('type', 'ramp')
type_map = {
'ramp': mapnik.COLORIZER_LINEAR,
'intervals': mapnik.COLORIZER_DISCRETE,
'values': mapnik.COLORIZER_EXACT,
}
mode = type_map[type]
colorizer = mapnik.RasterColorizer(mode, mapnik.Color('transparent'))
for c in sym.ColorMap.ColorMapEntry:
color = mapnik.Color(c.attrib['color'])
color.a = int(float(c.attrib.get('opacity', 1))*255)
value = float(c.attrib['quantity'])
label = c.attrib.get('label', '')
stop = mapnik.ColorizerStop(value, mapnik.COLORIZER_INHERIT, color)
stop.label = label
colorizer.add_stop(stop)
m_sym.colorizer = colorizer
yield m_sym
if __name__ == '__main__':
parser = optparse.OptionParser(usage="""geotools2mapnik.py <sld.xml> [shapefile] [OPTIONS]""")
parser.add_option('--srid',
type='int', dest='srid',
help='Provide an epsg code for the srs')
parser.add_option('-d','--datasource',
type='str', dest='datasource',
help='Provide an path to a shapefile datasource')
(options, args) = parser.parse_args()
if len(args) < 1:
sys.exit('provide path to an sld file')
xml = args[0]
tree = objectify.parse(xml)
root = tree.getroot()
main(root,**options.__dict__)