globe

Globe wireframe visualizations in Golang backed by pinhole.

Getting Started

Install globe with

$ go get -u github.com/mmcloughlin/globe

Start with a blank globe with a graticule at 10 degree intervals.

g := globe.New()
g.DrawGraticule(10.0)
g.SavePNG("graticule.png", 400)

Add some land boundaries and center it on a point. Alternatively DrawCountryBoundaries will give you countries.

g := globe.New()
g.DrawGraticule(10.0)
g.DrawLandBoundaries()
g.CenterOn(51.453349, -2.588323)
g.SavePNG("land.png", 400)

Here's all the Starbucks locations. Note color.NRGBA recommended to avoid artifacts.

shops, err := LoadCoffeeShops("./starbucks.json")
if err != nil {
    log.Fatal(err)
}

green := color.NRGBA{0x00, 0x64, 0x3c, 192}
g := globe.New()
g.DrawGraticule(10.0)
for _, s := range shops {
    g.DrawDot(s.Lat, s.Lng, 0.05, globe.Color(green))
}
g.CenterOn(40.645423, -73.903879)
err = g.SavePNG("starbucks.png", 400)
if err != nil {
    log.Fatal(err)
}

You can also do lines along great circles.

g := globe.New()
g.DrawGraticule(10.0)
g.DrawLandBoundaries()
g.DrawLine(
    51.453349, -2.588323,
    40.645423, -73.903879,
    globe.Color(color.NRGBA{255, 0, 0, 255}),
)
g.CenterOn(50.244440, -37.207949)
g.SavePNG("line.png", 400)

Also rectangles.

g := globe.New()
g.DrawGraticule(10.0)
g.DrawLandBoundaries()
g.DrawRect(
    41.897209, 12.500285,
    55.782693, 37.615993,
    globe.Color(color.NRGBA{255, 0, 0, 255}),
)
g.CenterOn(48, 25)
g.SavePNG("rect.png", 400)

See examples and package documentation for more.

License

globe is available under the ISC License.