mapnik

sij/mapnik

History

Dane Springmeyer 15a624fa79 update readmes for template plugins		2012-07-10 14:54:05 -07:00
..
build.py	link to boost system	2012-02-09 16:00:39 -08:00
hello_datasource.cpp	Revert "update rasterlite, occi, csv, hello_world, and rundemo"	2012-03-09 15:33:36 +00:00
hello_datasource.hpp	Revert "update rasterlite, occi, csv, hello_world, and rundemo"	2012-03-09 15:33:36 +00:00
hello_featureset.cpp	properly populate the context	2012-07-10 14:51:13 -07:00
hello_featureset.hpp	merge master with feature_impl	2012-01-17 17:47:27 -05:00
Makefile	recompile stale targets during deploy	2012-07-10 14:50:43 -07:00
README.md	update readmes for template plugins	2012-07-10 14:54:05 -07:00
test.xml	upgrade syntax to mapnik2	2011-04-09 05:35:25 +00:00

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')