mapnik

sij/mapnik

History

Dane Springmeyer ae5f4d26d1 tests: make consistent the proj4 string for epsg:4326		2013-01-25 00:49:55 -08:00
..
build.py	add back depedence of hello world plugin on libmapnik accidentally removed in refactoring in `3e67c1d694`	2013-01-13 22:16:43 -08:00
hello_datasource.cpp	remove bind option for datasources - refs #962	2012-12-17 10:03:07 -08:00
hello_datasource.hpp	remove as much mutable as possible	2012-12-17 12:59:15 -08:00
hello_featureset.cpp	fixup includes and value type and params usage across plugins	2013-01-04 09:23:06 -08:00
hello_featureset.hpp	fixup includes and value type and params usage across plugins	2013-01-04 09:23:06 -08:00
Makefile	recompile stale targets during deploy	2012-07-10 14:50:43 -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')