018e33cda8
- Do not force use of clang++ to build the plugin (broken on recent debian and derivates: https://bugs.debian.org/643959) - Do not force clean on install - Use -fPIC to build objects (or g++ complains) |
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|---|---|---|
| .. | ||
| build.py | ||
| hello_datasource.cpp | ||
| hello_datasource.hpp | ||
| hello_featureset.cpp | ||
| hello_featureset.hpp | ||
| Makefile | ||
| README.md | ||
| test.xml | ||
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 helloOr 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')