kopia lustrzana https://github.com/hholzgra/ocitysmap
371 wiersze
13 KiB
Python
371 wiersze
13 KiB
Python
# -*- coding: utf-8 -*-
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# ocitysmap, city map and street index generator from OpenStreetMap data
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# Copyright (C) 2010 David Decotigny
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# Copyright (C) 2010 Frédéric Lehobey
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# Copyright (C) 2010 Pierre Mauduit
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# Copyright (C) 2010 David Mentré
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# Copyright (C) 2010 Maxime Petazzoni
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# Copyright (C) 2010 Thomas Petazzoni
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# Copyright (C) 2010 Gaël Utard
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""OCitySMap 2.
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"""
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__author__ = 'The MapOSMatic developers'
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__version__ = '0.2'
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import cairo
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import ConfigParser
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import gzip
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import logging
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import os
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import psycopg2
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import re
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import tempfile
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import coords
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import i18n
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import index
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import renderers
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l = logging.getLogger('ocitysmap')
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class RenderingConfiguration:
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"""
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The RenderingConfiguration class encapsulate all the information concerning
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a rendering request. This data is used by the layout renderer, in
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conjonction with its rendering mode (defined by its implementation), to
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produce the map.
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"""
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def __init__(self):
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self.title = None # str
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self.osmid = None # None / int (shading + city name)
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self.bounding_box = None # bbox (from osmid if None)
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self.language = None # str (locale)
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self.stylesheet = None # Obj Stylesheet
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self.paper_width_mm = None
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self.paper_height_mm = None
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class Stylesheet:
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"""
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A Stylesheet object defines how the map features will be rendered. It
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contains information pointing to the Mapnik stylesheet and other styling
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parameters.
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"""
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def __init__(self):
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self.name = None # str
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self.path = None # str
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self.description = '' # str
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self.zoom_level = 16
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self.grid_line_color = 'black'
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self.grid_line_alpha = 0.5
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self.grid_line_width = 3
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self.shade_color = 'black'
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self.shade_alpha = 0.1
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@staticmethod
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def create_from_config_section(parser, section_name):
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"""Creates a Stylesheet object from the OCitySMap configuration.
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Args:
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parser (ConfigParser.ConfigParser): the configuration parser
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object.
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section_name (string): the stylesheet section name in the
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configuration.
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"""
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s = Stylesheet()
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def assign_if_present(key, cast_fn=str):
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if parser.has_option(section_name, key):
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setattr(s, key, cast_fn(parser.get(section_name, key)))
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s.name = parser.get(section_name, 'name')
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s.path = parser.get(section_name, 'path')
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assign_if_present('description')
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assign_if_present('zoom_level', int)
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assign_if_present('grid_line_color')
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assign_if_present('grid_line_alpha', float)
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assign_if_present('grid_line_width', int)
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assign_if_present('shade_color')
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assign_if_present('shade_alpha', float)
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return s
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@staticmethod
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def create_all_from_config(parser):
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styles = parser.get('rendering', 'available_stylesheets')
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if not styles:
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raise ValueError, \
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'OCitySMap configuration does not contain any stylesheet!'
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return [Stylesheet.create_from_config_section(parser, name)
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for name in styles.split(',')]
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class OCitySMap:
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DEFAULT_REQUEST_TIMEOUT_MIN = 15
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DEFAULT_ZOOM_LEVEL = 16
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DEFAULT_RESOLUTION_KM_IN_MM = 150
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STYLESHEET_REGISTRY = []
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def __init__(self, config_files=['/etc/ocitysmap.conf', '~/.ocitysmap.conf'],
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grid_table_prefix=None):
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"""..."""
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config_files = map(os.path.expanduser, config_files)
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l.info('Reading OCitySMap configuration from %s...' %
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', '.join(config_files))
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self._parser = ConfigParser.RawConfigParser()
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if not self._parser.read(config_files):
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raise IOError, 'None of the configuration files could be read!'
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self._locale_path = os.path.join(os.path.dirname(__file__), '..', 'locale')
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self._grid_table_prefix = '%sgrid_squares' % (grid_table_prefix or '')
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self.__db = None
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# Read stylesheet configuration
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self.STYLESHEET_REGISTRY = Stylesheet.create_all_from_config(self._parser)
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def _get_db(self):
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if self.__db:
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return self.__db
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# Database connection
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datasource = dict(self._parser.items('datasource'))
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l.info('Connecting to database %s on %s as %s...' %
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(datasource['dbname'], datasource['host'], datasource['user']))
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db = psycopg2.connect(user=datasource['user'],
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password=datasource['password'],
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host=datasource['host'],
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database=datasource['dbname'])
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# Force everything to be unicode-encoded, in case we run along Django
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# (which loads the unicode extensions for psycopg2)
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db.set_client_encoding('utf8')
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try:
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timeout = self._parser.get('datasource', 'request_timeout')
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except ConfigParser.NoOptionError:
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timeout = OCitySMap.DEFAULT_REQUEST_TIMEOUT_MIN
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self._set_request_timeout(db, timeout)
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self.__db = db
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return self.__db
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_db = property(_get_db)
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def _set_request_timeout(self, db, timeout_minutes=15):
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"""Sets the PostgreSQL request timeout to avoid long-running queries on
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the database."""
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cursor = db.cursor()
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cursor.execute('set session statement_timeout=%d;' %
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(timeout_minutes * 60 * 1000))
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cursor.execute('show statement_timeout;')
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l.debug('Configured statement timeout: %s.' %
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cursor.fetchall()[0][0])
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def _get_bounding_box(self, osmid):
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l.debug('Searching bounding box around OSM ID %d...' % osmid)
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cursor = self._db.cursor()
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cursor.execute("""select st_astext(st_transform(st_envelope(way), 4002))
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from planet_osm_polygon where osm_id=%d;""" %
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osmid)
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records = cursor.fetchall()
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if not records:
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raise ValueError, 'OSM ID %d not found in the database!' % osmid
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bbox = coords.BoundingBox.parse_wkt(records[0][0])
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l.debug('Found bounding box %s.' % bbox)
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return bbox
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def _cleanup_tempdir(self, tmpdir):
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l.debug('Cleaning up %s...' % tmpdir)
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for root, dirs, files in os.walk(tmpdir, topdown=False):
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for name in files:
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os.remove(os.path.join(root, name))
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for name in dirs:
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os.rmdir(os.path.join(root, name))
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os.rmdir(tmpdir)
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_regexp_polygon = re.compile('^POLYGON\(\(([^)]*)\)\)$')
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def _get_shade_wkt(self, bounding_box, osmid):
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l.info('Looking for contour around OSM ID %d...' % osmid)
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cursor = self._db.cursor()
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cursor.execute("""select st_astext(st_transform(st_buildarea(way), 4002))
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as polygon
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from planet_osm_polygon
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where osm_id=%d;""" % osmid)
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data = cursor.fetchall()
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try:
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polygon = data[0][0].strip()
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except (KeyError, IndexError, AttributeError):
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l.error('Invalid database structure!')
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return None
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if not polygon:
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return None
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matches = self._regexp_polygon.match(polygon)
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if not matches:
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l.error('Administrative boundary looks invalid!')
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return None
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inside = matches.groups()[0]
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bounding_box = bounding_box.create_expanded(0.05, 0.05)
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xmax, ymin = bounding_box.get_top_left()
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xmin, ymax = bounding_box.get_bottom_right()
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poly = "MULTIPOLYGON(((%f %f, %f %f, %f %f, %f %f, %f %f)),((%s)))" % \
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(ymin, xmin, ymin, xmax, ymax, xmax, ymax, xmin, ymin, xmin,
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inside)
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return poly
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def get_all_style_configurations(self):
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"""Returns the list of all available stylesheet configurations (list of
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Stylesheet objects)."""
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return self.STYLESHEET_REGISTRY
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def get_stylesheet_by_name(self, name):
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"""Returns a stylesheet by its key name."""
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for style in self.STYLESHEET_REGISTRY:
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if style.name == name:
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return style
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raise LookupError, 'The requested stylesheet %s was not found!' % name
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def get_all_renderers(self):
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"""Returns the list of all available layout renderers (list of Renderer
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objects)."""
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pass
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def render(self, config, renderer_name, output_formats, file_prefix):
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"""Renders a job with the given rendering configuration, using the
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provided renderer, to the given output formats.
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Args:
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config (RenderingConfiguration): the rendering configuration
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object.
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renderer_name (string): the layout renderer to use for this rendering.
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output_formats (list): a list of output formats to render to, from
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the list of supported output formats (pdf, svgz, etc.).
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file_prefix (string): filename prefix for all output files.
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"""
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assert config.osmid or config.bounding_box, \
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'At least an OSM ID or a bounding box must be provided!'
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output_formats = map(lambda x: x.lower(), output_formats)
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self._i18n = i18n.install_translation(config.language,
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self._locale_path)
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config.rtl = self._i18n.isrtl()
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l.info('Rendering language: %s (rtl: %s).' %
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(self._i18n.language_code(), config.rtl))
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# Make sure we have a bounding box
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config.bounding_box = (config.bounding_box or
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self._get_bounding_box(config.osmid))
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# Create a temporary directory for all our shape files
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tmpdir = tempfile.mkdtemp(prefix='ocitysmap')
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l.debug('Rendering in temporary directory %s' % tmpdir)
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renderer_cls = renderers.get_renderer_class_by_name(renderer_name)
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renderer = renderer_cls(config, tmpdir)
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renderer.create_map_canvas()
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if config.osmid:
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shade_wkt = self._get_shade_wkt(
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renderer.canvas.get_actual_bounding_box(),
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config.osmid)
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renderer.render_shade(shade_wkt)
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renderer.canvas.render()
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street_index = index.StreetIndex(config.osmid,
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renderer.canvas.get_actual_bounding_box(),
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config.language, renderer.grid)
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try:
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for output_format in output_formats:
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output_filename = '%s.%s' % (file_prefix, output_format)
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self._render_one(renderer, street_index, output_filename,
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output_format)
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# TODO: street_index.as_csv()
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finally:
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self._cleanup_tempdir(tmpdir)
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def _render_one(self, renderer, street_index, filename, output_format):
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l.info('Rendering %s...' % filename)
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factory = None
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if output_format == 'png':
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factory = lambda w,h: cairo.ImageSurface(cairo.FORMAT_ARGB32, w, h)
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elif output_format == 'svg':
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factory = lambda w,h: cairo.SVGSurface(filename, w, h)
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elif output_format == 'svgz':
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factory = lambda w,h: cairo.SVGSurface(
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gzip.GzipFile(filename, 'wb'), w, h)
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elif output_format == 'pdf':
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factory = lambda w,h: cairo.PDFSurface(filename, w, h)
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elif output_format == 'ps':
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factory = lambda w,h: cairo.PSSurface(filename, w, h)
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elif output_format == 'csv':
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# We don't render maps into CSV.
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return
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else:
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raise ValueError, \
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'Unsupported output format: %s!' % output_format.upper()
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surface = factory(renderer.paper_width_pt, renderer.paper_height_pt)
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renderer.render(surface, street_index)
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surface.finish()
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if __name__ == '__main__':
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logging.basicConfig(level=logging.DEBUG)
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o = OCitySMap(['/home/sam/src/python/maposmatic/ocitysmap/ocitysmap.conf.mine'])
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c = RenderingConfiguration()
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c.title = 'Chevreuse'
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c.osmid = -943886 # -7444 (Paris)
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c.language = 'fr_FR'
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c.paper_width_mm = 210
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c.paper_height_mm = 297
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c.stylesheet = o.get_stylesheet_by_name('Default')
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o.render(c, 'plain', ['png', 'pdf'], '/tmp/mymap')
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