Hello to all,
I have succesfully rendered a map through Postgres datasource using Python API.
Now I am trying to do the same through C++ API.
The map doesn't get shown when through C++ program.
The only major difference I found in compilation output was the "Scale"
Here by I have attached the Python as well as C++ code as well as their
respective outputs.
Kindly help,
Thanks!
--
Regards,
Anisha Kaul
#!/usr/bin/env python
from mapnik import *
m = Map (2600, 2300, "+proj=latlong +datum=WGS84")
m.background = Color ('white')
""" Defining rules and style for Layer 1 ________________________________________________________ """
r = Rule ()
# For showing roads
r.symbols.append (LineSymbolizer (Color ('darkorange'), 2))
s1 = Style ()
s1.rules.append (r)
m.append_style ('style1', s1)
lyr = Layer ('roads')
lyr.datasource = PostGIS (host='127.0.0.1',user='anisha',password='',dbname='gis',table='planet_osm_roads')
lyr.styles.append ('style1')
""" Defining rules and style for Layer 2 ________________________________________________________ """
r2 = Rule()
# For showing text
r2.symbols.append (TextSymbolizer ('name', 'DejaVu Sans Book', 30, Color('green')))
s2 = Style()
s2.rules.append (r2)
m.append_style ('style2', s2)
lyr2 = Layer('places')
lyr2.datasource = PostGIS (host='127.0.0.1',user='anisha',password='',dbname='gis',table='planet_osm_line')
lyr2.styles.append ('style2')
# Append the second, background layer first, since Mapnik uses the painter's model
m.layers.append (lyr2)
m.layers.append (lyr)
m.zoom_all ()
render_to_file (m, 'postgis_geometry.png')
ani...@linux:~/mapnikCode/18Jan> python layersPostgres.py
registered datasource : raster
registered datasource : osm
registered datasource : shape
registered datasource : postgis
registered datasource : sqlite
size = 6
dbname=gis
host=127.0.0.1
password=
table=planet_osm_roads
type=postgis
user=anisha
datasource=0x70b4c0 type=1
size = 6
dbname=gis
host=127.0.0.1
password=
table=planet_osm_line
type=postgis
user=anisha
datasource=0x7099a0 type=1
layer1 - > Envelope(68.1872177124023,6.74739980697632,97.4028778076172,35.5042037963867)
layer2 - > Envelope(68.1872177124023,6.74739980697632,97.4028778076172,35.5042037963867)
layer1 - > Envelope(68.1872177124023,8.076608657836911,97.4028778076172,35.5038909912109)
layer2 - > Envelope(68.1872177124023,8.076608657836911,97.4028778076172,35.5038909912109)
scale=0.012503
start map processing bbox=Envelope(66.54120202686475,6.74739980697632,99.04889349315475,35.5042037963867)
scale denominator = 4.9708e+06
start layer processing : places
datasource = 0x7099a0
end layer processing
start layer processing : roads
datasource = 0x70b4c0
end layer processing
end map processing
5.16 s
~font_face: Clean up face "DejaVu Sans Book"
destroyed singleton
destroyed singleton
destroyed singleton
#include <mapnik/map.hpp>
#include <mapnik/datasource_cache.hpp>
#include <mapnik/font_engine_freetype.hpp>
#include <mapnik/agg_renderer.hpp>
#include <mapnik/filter_factory.hpp>
#include <mapnik/color_factory.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/config_error.hpp>
#include <iostream>
int main (int argc ,char** argv)
{
using namespace mapnik;
std::string mapnik_dir (argv[1]);
datasource_cache::instance()->register_datasources (mapnik_dir + "/input/");
freetype_engine::register_font(mapnik_dir + "/fonts/DejaVuSans.ttf");
Map m (2600, 2300, "+proj=latlong +datum=WGS84");
m.set_background (color_factory::from_string ("white"));
// Defining rules and style for Layer 1 ________________________________________________________
stroke line1 (color(0,0,0),1.0);
line1.add_dash (8, 4);
line1.add_dash (2, 2);
line1.add_dash (2, 2);
feature_type_style style1;
rule_type rule1;
rule1.append (line_symbolizer (line1));
style1.add_rule (rule1);
m.insert_style ("roads", style1);
parameters p1;
p1["type"] ="postgis";
p1["host"] ="127.0.0.1";
p1["port"] ="5432";
p1["dbname"] ="gis";
p1["user"] ="anisha";
p1["password"] ="";
p1["table"] ="planet_osm_roads";
Layer lyr1("roads");
lyr1.set_datasource(datasource_cache::instance()->create(p1));
lyr1.add_style("style1");
// Defining rules and style for Layer 2 ________________________________________________________
feature_type_style style2;
rule_type rule2;
rule2.append (text_symbolizer ("DejaVu Sans Book", 30, color(250, 190, 183)));
style2.add_rule (rule2);
m.insert_style ("places", style2);
parameters p2;
p2["type"] ="postgis";
p2["host"] ="127.0.0.1";
p2["port"] ="5432";
p2["dbname"] ="gis";
p2["user"] ="anisha";
p2["password"] ="";
p2["table"] ="planet_osm_line";
Layer lyr2("places");
lyr2.set_datasource(datasource_cache::instance()->create (p2));
lyr2.add_style("style2");
// Append the second, background layer first, since Mapnik uses the painter's model
m.addLayer (lyr2);
m.addLayer (lyr1);
m.zoom_all ();
Image32 buf (m.getWidth(),m.getHeight());
agg_renderer<Image32> ren (m, buf);
ren.apply();
save_to_file<ImageData32> (buf.data(), "demo.jpg", "jpeg");
}
ani...@linux:~/mapnik-0.6.0> demo/c++/./rundemo /usr/local/lib64/mapnik/
registered datasource : raster
registered datasource : osm
registered datasource : shape
registered datasource : postgis
registered datasource : sqlite
size = 7
dbname=gis
host=127.0.0.1
password=
port=5432
table=planet_osm_roads
type=postgis
user=anisha
datasource=0x80ca40 type=1
size = 7
dbname=gis
host=127.0.0.1
password=
port=5432
table=planet_osm_line
type=postgis
user=anisha
datasource=0x7f94d0 type=1
layer1 - > Envelope(68.1872177124023,6.74739980697632,97.4028778076172,35.5042037963867)
layer2 - > Envelope(68.1872177124023,6.74739980697632,97.4028778076172,35.5042037963867)
layer1 - > Envelope(68.1872177124023,8.076608657836911,97.4028778076172,35.5038909912109)
layer2 - > Envelope(68.1872177124023,8.076608657836911,97.4028778076172,35.5038909912109)
scale=3.84282e-06
start map processing bbox=Envelope(66.54120202686475,6.74739980697632,99.04889349315475,35.5042037963867)
scale denominator = 1527.79
start layer processing : places
datasource = 0x7f94d0
end layer processing
start layer processing : roads
datasource = 0x80ca40
end layer processing
end map processing
0.00 s
destroyed singleton
destroyed singleton
-------------------------------------
Hi-Tech Gears Limited, Gurgaon, India
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