Small wrapper for the Mapnik 3 API to render beautiful maps from Go.
Features:
- Render to
[]byte,image.Image, or file. - Set scale denominator or scale factor.
- Enable/disable single layers.
This package requires Mapnik (libmapnik-dev on Ubuntu/Debian, mapnik in Homebrew).
Make sure mapnik-config is in your PATH.
You need to set the CGO_LDFLAGS and CGO_CXXFLAGS environment variables for successful compilation and linking with Mapnik.
Refer to the Makefile how mapnik-config can be used to extract the required CGO_LDFLAGS and CGO_CXXFLAGS values. Use -ldflags to overwrite the default location of the input plugins and default fonts.
go-mapnik is independent of the Proj version. Make sure that your mapfiles and SRS strings use the correct syntax (epsg:4326 vs. +init=epsg:4326).
You can set the environment PROJ_USE_PROJ4_INIT_RULES=YES for backwards compatibility. This supports +init=epsg:xxx definitions and keeps the fixed long/lat and E/N axis orientation.
API documentation can be found here: http://godoc.org/github.com/omniscale/go-mapnik
MIT, see LICENSE file.
Oliver Tonnhofer, Omniscale
This package is inspired/based on mapnik-c-api by Dane Springmeyer and go-mapnik by Fabian Wickborn.