354 lines
13 KiB
Python
354 lines
13 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# $Id$
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#
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# This file is part of Mapnik (c++ mapping toolkit)
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# Copyright (C) 2005 Jean-Francois Doyon
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#
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# Mapnik is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or any later version.
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#
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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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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# Import everything. In this case this is safe, in more complex systems, you
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# will want to be more selective.
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try:
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import mapnik
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except:
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print '\n\nThe mapnik library and python bindings must have been compiled and \
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installed successfully before running this script.\n\n'
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raise
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# Instanciate a map, giving it a width and height. Remember: the word "map" is
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# reserved in Python! :)
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m = mapnik.Map(800,600,"+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")
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# Set its background colour. More on colours later ...
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m.background = mapnik.Color('white')
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# Now we can start adding layers, in stacking order (i.e. bottom layer first)
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# Canadian Provinces (Polygons)
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# Instanciate a layer. The parameters depend on the type of data:
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# shape:
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# type='shape'
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# file='/path/to/shape'
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# raster:
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# type='raster'
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# file='/path/to/raster'
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# postgis:
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# type='postgis'
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# host='127.0.0.1'
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# dbname='mydatabase'
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# user='myusername'
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# password='mypassword'
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# table= TODO
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provpoly_lyr = mapnik.Layer('Provinces')
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provpoly_lyr.srs = "+proj=lcc +ellps=GRS80 +lat_0=49 +lon_0=-95 +lat+1=49 +lat_2=77 +datum=NAD83 +units=m +no_defs"
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provpoly_lyr.datasource = mapnik.Shapefile(file='../data/boundaries', encoding='latin1')
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# We then define a style for the layer. A layer can have one or many styles.
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# Styles are named, so they can be shared across different layers.
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# Multiple styles per layer behaves functionally like multiple layers. The
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# data is completely re-scanned for each style within one layer, and a style
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# will be drawn entirely "above" the previous one. Performance wise using
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# multiple styles in one layer is the same has having multiple layers.
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# The paradigm is useful mostly as a convenience.
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provpoly_style = mapnik.Style()
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# A Style needs one or more rules. A rule will normally consist of a filter
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# for feature selection, and one or more symbolizers.
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provpoly_rule_on = mapnik.Rule()
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# A Expression() allows the selection of features to which the symbology will
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# be applied. More on Mapnik expressions can be found in Tutorial #2.
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# A given feature can only match one filter per rule per style.
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provpoly_rule_on.filter = mapnik.Expression("[NAME_EN] = 'Ontario'")
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# Here a symbolizer is defined. Available are:
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# - LineSymbolizer(Color(),<width>)
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# - LineSymbolizer(Stroke())
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# - PolygonSymbolizer(Color())
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# - PointSymbolizer(<file>,<type>,<width>,<height>)
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# Some of them can accept a Color() instance, which can be created with:
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# - Color(<red>, <green>, <blue>)
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# - Color(<red>, <green>, <blue>, <alpha>)
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# - Color(<string>) where <string> will be something like '#00FF00'
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# or '#0f0' or 'green'
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provpoly_rule_on.symbols.append(mapnik.PolygonSymbolizer(mapnik.Color(250, 190, 183)))
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provpoly_style.rules.append(provpoly_rule_on)
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provpoly_rule_qc = mapnik.Rule()
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provpoly_rule_qc.filter = mapnik.Expression("[NOM_FR] = 'Québec'")
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provpoly_rule_qc.symbols.append(mapnik.PolygonSymbolizer(mapnik.Color(217, 235, 203)))
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provpoly_style.rules.append(provpoly_rule_qc)
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# Add the style to the map, giving it a name. This is the name that will be
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# used to refer to it from here on. Having named styles allows them to be
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# re-used throughout the map.
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m.append_style('provinces', provpoly_style)
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# Then associate the style to the layer itself.
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provpoly_lyr.styles.append('provinces')
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# Then add the layer to the map. In reality, it's the order in which you
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# append them to the map that will determine the drawing order, though by
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# convention it is recommended to define them in drawing order as well.
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m.layers.append(provpoly_lyr)
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# Drainage
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# A simple example ...
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qcdrain_lyr = mapnik.Layer('Quebec Hydrography')
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qcdrain_lyr.srs = "+proj=lcc +ellps=GRS80 +lat_0=49 +lon_0=-95 +lat+1=49 +lat_2=77 +datum=NAD83 +units=m +no_defs"
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qcdrain_lyr.datasource = mapnik.Shapefile(file='../data/qcdrainage')
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qcdrain_style = mapnik.Style()
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qcdrain_rule = mapnik.Rule()
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qcdrain_rule.filter = mapnik.Expression('[HYC] = 8')
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qcdrain_rule.symbols.append(mapnik.PolygonSymbolizer(mapnik.Color(153, 204, 255)))
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qcdrain_style.rules.append(qcdrain_rule)
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m.append_style('drainage', qcdrain_style)
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qcdrain_lyr.styles.append('drainage')
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m.layers.append(qcdrain_lyr)
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# In this case, we have 2 data sets with similar schemas (same filtering
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# attributes, and same desired style), so we're going to
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# re-use the style defined in the above layer for the next one.
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ondrain_lyr = mapnik.Layer('Ontario Hydrography')
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ondrain_lyr.srs = "+proj=lcc +ellps=GRS80 +lat_0=49 +lon_0=-95 +lat+1=49 +lat_2=77 +datum=NAD83 +units=m +no_defs"
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ondrain_lyr.datasource = mapnik.Shapefile(file='../data/ontdrainage')
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ondrain_lyr.styles.append('drainage')
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m.layers.append(ondrain_lyr)
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# Provincial boundaries
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provlines_lyr = mapnik.Layer('Provincial borders')
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provlines_lyr.srs = "+proj=lcc +ellps=GRS80 +lat_0=49 +lon_0=-95 +lat+1=49 +lat_2=77 +datum=NAD83 +units=m +no_defs"
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provlines_lyr.datasource = mapnik.Shapefile(file='../data/boundaries_l')
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# Here we define a "dash dot dot dash" pattern for the provincial boundaries.
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provlines_stk = mapnik.Stroke()
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provlines_stk.add_dash(8, 4)
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provlines_stk.add_dash(2, 2)
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provlines_stk.add_dash(2, 2)
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provlines_stk.color = mapnik.Color('black')
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provlines_stk.width = 1.0
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provlines_style = mapnik.Style()
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provlines_rule = mapnik.Rule()
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provlines_rule.symbols.append(mapnik.LineSymbolizer(provlines_stk))
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provlines_style.rules.append(provlines_rule)
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m.append_style('provlines', provlines_style)
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provlines_lyr.styles.append('provlines')
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m.layers.append(provlines_lyr)
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# Roads 3 and 4 (The "grey" roads)
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roads34_lyr = mapnik.Layer('Roads')
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roads34_lyr.srs = "+proj=lcc +ellps=GRS80 +lat_0=49 +lon_0=-95 +lat+1=49 +lat_2=77 +datum=NAD83 +units=m +no_defs"
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# create roads datasource (we're going to re-use it later)
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roads34_lyr.datasource = mapnik.Shapefile(file='../data/roads')
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roads34_style = mapnik.Style()
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roads34_rule = mapnik.Rule()
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roads34_rule.filter = mapnik.Expression('([CLASS] = 3) or ([CLASS] = 4)')
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# With lines of a certain width, you can control how the ends
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# are closed off using line_cap as below.
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roads34_rule_stk = mapnik.Stroke()
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roads34_rule_stk.color = mapnik.Color(171,158,137)
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roads34_rule_stk.line_cap = mapnik.line_cap.ROUND_CAP
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# Available options are:
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# line_cap: BUTT_CAP, SQUARE_CAP, ROUND_CAP
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# line_join: MITER_JOIN, MITER_REVERT_JOIN, ROUND_JOIN, BEVEL_JOIN
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# And one last Stroke() attribute not used here is "opacity", which
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# can be set to a numerical value.
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roads34_rule_stk.width = 2.0
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roads34_rule.symbols.append(mapnik.LineSymbolizer(roads34_rule_stk))
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roads34_style.rules.append(roads34_rule)
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m.append_style('smallroads', roads34_style)
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roads34_lyr.styles.append('smallroads')
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m.layers.append(roads34_lyr)
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# Roads 2 (The thin yellow ones)
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roads2_lyr = mapnik.Layer('Roads')
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roads2_lyr.srs = "+proj=lcc +ellps=GRS80 +lat_0=49 +lon_0=-95 +lat+1=49 +lat_2=77 +datum=NAD83 +units=m +no_defs"
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# Just get a copy from roads34_lyr
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roads2_lyr.datasource = roads34_lyr.datasource
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roads2_style_1 = mapnik.Style()
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roads2_rule_1 = mapnik.Rule()
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roads2_rule_1.filter = mapnik.Expression('[CLASS] = 2')
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roads2_rule_stk_1 = mapnik.Stroke()
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roads2_rule_stk_1.color = mapnik.Color(171,158,137)
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roads2_rule_stk_1.line_cap = mapnik.line_cap.ROUND_CAP
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roads2_rule_stk_1.width = 4.0
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roads2_rule_1.symbols.append(mapnik.LineSymbolizer(roads2_rule_stk_1))
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roads2_style_1.rules.append(roads2_rule_1)
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m.append_style('road-border', roads2_style_1)
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roads2_style_2 = mapnik.Style()
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roads2_rule_2 = mapnik.Rule()
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roads2_rule_2.filter = mapnik.Expression('[CLASS] = 2')
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roads2_rule_stk_2 = mapnik.Stroke()
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roads2_rule_stk_2.color = mapnik.Color(255,250,115)
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roads2_rule_stk_2.line_cap = mapnik.line_cap.ROUND_CAP
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roads2_rule_stk_2.width = 2.0
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roads2_rule_2.symbols.append(mapnik.LineSymbolizer(roads2_rule_stk_2))
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roads2_style_2.rules.append(roads2_rule_2)
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m.append_style('road-fill', roads2_style_2)
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roads2_lyr.styles.append('road-border')
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roads2_lyr.styles.append('road-fill')
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m.layers.append(roads2_lyr)
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# Roads 1 (The big orange ones, the highways)
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roads1_lyr = mapnik.Layer('Roads')
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roads1_lyr.srs = "+proj=lcc +ellps=GRS80 +lat_0=49 +lon_0=-95 +lat+1=49 +lat_2=77 +datum=NAD83 +units=m +no_defs"
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roads1_lyr.datasource = roads34_lyr.datasource
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roads1_style_1 = mapnik.Style()
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roads1_rule_1 = mapnik.Rule()
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roads1_rule_1.filter = mapnik.Expression('[CLASS] = 1')
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roads1_rule_stk_1 = mapnik.Stroke()
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roads1_rule_stk_1.color = mapnik.Color(188,149,28)
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roads1_rule_stk_1.line_cap = mapnik.line_cap.ROUND_CAP
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roads1_rule_stk_1.width = 7.0
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roads1_rule_1.symbols.append(mapnik.LineSymbolizer(roads1_rule_stk_1))
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roads1_style_1.rules.append(roads1_rule_1)
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m.append_style('highway-border', roads1_style_1)
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roads1_style_2 = mapnik.Style()
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roads1_rule_2 = mapnik.Rule()
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roads1_rule_2.filter = mapnik.Expression('[CLASS] = 1')
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roads1_rule_stk_2 = mapnik.Stroke()
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roads1_rule_stk_2.color = mapnik.Color(242,191,36)
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roads1_rule_stk_2.line_cap = mapnik.line_cap.ROUND_CAP
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roads1_rule_stk_2.width = 5.0
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roads1_rule_2.symbols.append(mapnik.LineSymbolizer(roads1_rule_stk_2))
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roads1_style_2.rules.append(roads1_rule_2)
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m.append_style('highway-fill', roads1_style_2)
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roads1_lyr.styles.append('highway-border')
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roads1_lyr.styles.append('highway-fill')
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m.layers.append(roads1_lyr)
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# Populated Places
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popplaces_lyr = mapnik.Layer('Populated Places')
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popplaces_lyr.srs = "+proj=lcc +ellps=GRS80 +lat_0=49 +lon_0=-95 +lat+1=49 +lat_2=77 +datum=NAD83 +units=m +no_defs"
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popplaces_lyr.datasource = mapnik.Shapefile(file='../data/popplaces',encoding='latin1')
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popplaces_style = mapnik.Style()
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popplaces_rule = mapnik.Rule()
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# And here we have a TextSymbolizer, used for labeling.
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# The first parameter is the name of the attribute to use as the source of the
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# text to label with. Then there is font size in points (I think?), and colour.
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popplaces_text_symbolizer = mapnik.TextSymbolizer(mapnik.Expression("[GEONAME]"),
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'DejaVu Sans Book',
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10, mapnik.Color('black'))
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# We set a "halo" around the text, which looks like an outline if thin enough,
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# or an outright background if large enough.
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popplaces_text_symbolizer.label_placement= mapnik.label_placement.POINT_PLACEMENT
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popplaces_text_symbolizer.halo_fill = mapnik.Color('white')
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popplaces_text_symbolizer.halo_radius = 1
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popplaces_text_symbolizer.avoid_edges = True
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popplaces_rule.symbols.append(popplaces_text_symbolizer)
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popplaces_style.rules.append(popplaces_rule)
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m.append_style('popplaces', popplaces_style)
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popplaces_lyr.styles.append('popplaces')
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m.layers.append(popplaces_lyr)
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# Draw map
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# Set the initial extent of the map in 'master' spherical Mercator projection
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m.zoom_to_box(mapnik.Box2d(-8024477.28459,5445190.38849,-7381388.20071,5662941.44855))
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# Render two maps, two PNGs, one JPEG.
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im = mapnik.Image(m.width,m.height)
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mapnik.render(m, im)
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# Save image to files
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images = []
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im.save('demo.png', 'png') # true-colour RGBA
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images.append('demo.png')
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im.save('demo256.png', 'png256') # save to palette based (max 256 colours) png
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images.append('demo256.png')
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im.save('demo.jpg', 'jpeg')
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images.append('demo.jpg')
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# Render cairo examples
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if mapnik.has_pycairo():
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import cairo
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svg_surface = cairo.SVGSurface('demo.svg', m.width,m.height)
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mapnik.render(m, svg_surface)
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svg_surface.finish()
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images.append('demo.svg')
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pdf_surface = cairo.PDFSurface('demo.pdf', m.width,m.height)
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mapnik.render(m, pdf_surface)
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images.append('demo.pdf')
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pdf_surface.finish()
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postscript_surface = cairo.PSSurface('demo.ps', m.width,m.height)
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mapnik.render(m, postscript_surface)
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images.append('demo.ps')
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postscript_surface.finish()
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else:
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print '\n\nSkipping cairo examples as Mapnik Pycairo support not available'
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print "\n\n", len(images), "maps have been rendered in the current directory:"
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for image in images:
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print "-", image
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print "\n\nHave a look!\n\n"
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mapnik.save_map(m,"map.xml")
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