Small wrapper for the Mapnik 3/4 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 on Ubuntu/Debian, mapnik in Homebrew).
Since v3 of this package you need to call go generate . to create a build_config.go file with all system dependent build flags.
Before v3, go-mapnik required setting CGO_* environment variables. The new method is easier, but it does not work when you go get/import go-mapnik.
It is recommended to manually vendorize the package into your repo (e.g via git subtree).
func Example() {
m := mapnik.New()
if err := m.Load("test/map.xml"); err != nil {
log.Fatal(err)
}
m.Resize(1000, 500)
m.ZoomTo(-180, -90, 180, 90)
opts := mapnik.RenderOpts{Format: "png32"}
if err := m.RenderToFile(opts, "/tmp/go-mapnik-example-1.png"); err != nil {
log.Fatal(err)
}
}
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.