mapnik

sij/mapnik

History

artemp 0702679bb0 don't call *params.get<std::string>("type"), instead use static datasource::name() (FIXME: consider removing redundant 'name' in feature_layer_descriptor)		2014-06-26 10:51:24 +01:00
..
build.py	scons: support MAPNIK_NAME option to customize libmapnik name for custom packaging	2014-06-09 13:55:56 -07:00
hello_datasource.cpp	don't call *params.get<std::string>("type"), instead use static datasource::name()	2014-06-26 10:51:24 +01:00
hello_datasource.hpp	+ replace <boost/shared_ptr.hpp> with <memory>	2013-09-20 14:13:23 +01:00
hello_featureset.cpp	c++11 compile fixes	2013-10-22 16:05:44 -04:00
hello_featureset.hpp	use const std::unique_ptr<> instead of boost::scoped_ptr<>	2013-09-20 14:22:58 +01:00
Makefile	Makefile tweaks for helloworld template plugin	2014-06-16 09:52:26 -07:00
README.md	tests: make consistent the proj4 string for epsg:4326	2013-01-25 00:49:55 -08:00
test.xml	tests: make consistent the proj4 string for epsg:4326	2013-01-25 00:49:55 -08:00

README.md

hello world plugin

This is a very simple sample plugin. It is designed to help developers see the skeletal basics needed to achieve a functional datasource plugin.

It is not a model plugin of best practices as much as a model of the bare minimum you need to have a working plugin that returns a single feature.

Code comments attempt to highlight which code is mandatory, which is simply recommended, and which is purely fluff used to get the plugin to actually show some data.

When added to a map it provides a single point geometry representing the center of any query. This means that it should place a point in the middle of any map tile and display a "hello world!" label if used like:

style hello

Or used in python like:

from mapnik import * m = Map(600,400) m.background = Color('white') s = Style() r = Rule() r.symbols.append(PointSymbolizer()) t = TextSymbolizer(Expression("[key]"),"DejaVu Sans Book",10,Color('black')) t.displacement = (15,15) r.symbols.append(t) s.rules.append(r) m.append_style('style',s) ds = Datasource(type="hello") l = Layer('test') l.styles.append('style') l.datasource = ds m.layers.append(l) m.zoom_all() render_to_file(m,'test.png')