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# go-staticmaps
A go (golang) library and command line tool to render static map images using OpenStreetMap tiles.

## What?
go-staticmaps is a golang library that allows you to create nice static map images from OpenStreetMap tiles, along with markers of different size and color, as well as paths and colored areas.

go-staticmaps comes with a command line tool called `create-static-map` for use in shell scripts, etc.

![Static map of the Berlin Marathon](https://raw.githubusercontent.com/flopp/flopp.github.io/master/go-staticmaps/berlin-marathon.png)

## How?

### Installation

Installing go-staticmaps is as easy as

```bash
go get -u github.com/flopp/go-staticmaps
```

For the command line tool, use
```bash
go get -u github.com/flopp/go-staticmaps/create-static-map
```

Of course, your local Go installation must be setup up properly.

### Library Usage

Create a 400x300 pixel map with a red marker:

```go
import (
  "image/color"

  "github.com/flopp/go-staticmaps"
  "github.com/fogleman/gg"
  "github.com/golang/geo/s2"
)

func main() {
  ctx := sm.NewContext()
  ctx.SetSize(400, 300)
  ctx.AddMarker(sm.NewMarker(s2.LatLngFromDegrees(52.514536, 13.350151), color.RGBA{0xff, 0, 0, 0xff}, 16.0))

  img, err := ctx.Render()
  if err != nil {
    panic(err)
  }

  if err := gg.SavePNG("my-map.png", img); err != nil {
    panic(err)
  }
}
```


See [GoDoc](https://godoc.org/github.com/flopp/go-staticmaps) for a complete documentation and the source code of the [command line tool](https://github.com/flopp/go-staticmaps/blob/master/create-static-map/create-static-map.go) for an example how to use the package.


### Command Line Usage

    Usage:
      create-static-map [OPTIONS]

    Creates a static map

    Application Options:
          --width=PIXELS       Width of the generated static map image (default: 512)
          --height=PIXELS      Height of the generated static map image (default: 512)
      -o, --output=FILENAME    Output file name (default: map.png)
      -t, --type=MAPTYPE       Select the map type; list possible map types with '--type list'
      -c, --center=LATLNG      Center coordinates (lat,lng) of the static map
      -z, --zoom=ZOOMLEVEL     Zoom factor
      -b, --bbox=NW_LATLNG|SE_LATLNG
                               Set the bounding box (NW_LATLNG = north-western point of the
                               bounding box, SW_LATLNG = southe-western point of the bounding
                               box)
      -m, --marker=MARKER      Add a marker to the static map
      -p, --path=PATH          Add a path to the static map
      -a, --area=AREA          Add an area to the static map

    Help Options:
      -h, --help               Show this help message

### General
The command line interface tries to resemble [Google's Static Maps API](https://developers.google.com/maps/documentation/static-maps/intro).
If neither `--bbox`, `--center`, nor `--zoom` are given, the map extent is determined from the specified markers, paths and areas.

### Markers
The `--marker` option defines one or more map markers of the same style. Use multiple `--marker` options to add markers of different styles.

    --marker MARKER_STYLES|LATLNG|LATLNG|...

`LATLNG` is a comma separated pair of latitude and longitude, e.g. `52.5153,13.3564`.

`MARKER_STYLES` consists of a set of style descriptors separated by the pipe character `|`:

- `color:COLOR` - where `COLOR` is either of the form `0xRRGGBB`, `0xRRGGBBAA`, or one of `black`, `blue`, `brown`, `green`, `orange`, `purple`, `red`, `yellow`, `white` (default: `red`)
- `size:SIZE` - where `SIZE` is one of `mid`, `small`, `tiny`, or some number > 0 (default: `mid`)
- `label:LABEL` - where `LABEL` is an alpha numeric character, i.e. `A`-`Z`, `a`-`z`, `0`-`9`; (default: no label)
- `labelcolor:COLOR` - where `COLOR` is either of the form `0xRRGGBB`, `0xRRGGBBAA`, or one of `black`, `blue`, `brown`, `green`, `orange`, `purple`, `red`, `yellow`, `white` (default: `black` or `white`, depending on the marker color)


### Paths
The `--path` option defines a path on the map. Use multiple `--path` options to add multiple paths to the map.

    --path PATH_STYLES|LATLNG|LATLNG|...

or

    --path PATH_STYLES|gpx:my_gpx_file.gpx

`PATH_STYLES` consists of a set of style descriptors separated by the pipe character `|`:

- `color:COLOR` - where `COLOR` is either of the form `0xRRGGBB`, `0xRRGGBBAA`, or one of `black`, `blue`, `brown`, `green`, `orange`, `purple`, `red`, `yellow`, `white` (default: `red`)
- `weight:WEIGHT` - where `WEIGHT` is the line width in pixels (defaut: `5`)

### Areas
The `--area` option defines a closed area on the map. Use multiple `--area` options to add multiple areas to the map.

    --area AREA_STYLES|LATLNG|LATLNG|...

`AREA_STYLES` consists of a set of style descriptors separated by the pipe character `|`:

- `color:COLOR` - where `COLOR` is either of the form `0xRRGGBB`, `0xRRGGBBAA`, or one of `black`, `blue`, `brown`, `green`, `orange`, `purple`, `red`, `yellow`, `white` (default: `red`)
- `weight:WEIGHT` - where `WEIGHT` is the line width in pixels (defaut: `5`)
- `fill:COLOR` - where `COLOR` is either of the form `0xRRGGBB`, `0xRRGGBBAA`, or one of `black`, `blue`, `brown`, `green`, `orange`, `purple`, `red`, `yellow`, `white` (default: none)


## Examples

### Basic Maps

Centered at "N 52.514536 E 13.350151" with zoom level 10:

```bash
$ create-static-map --width 600 --height 400 -o map1.png -c "52.514536,13.350151" -z 10
```
![Example 1](https://raw.githubusercontent.com/flopp/flopp.github.io/master/go-staticmaps/map1.png)

A map with a marker at "N 52.514536 E 13.350151" with zoom level 14 (no need to specify the map's center - it is automatically computed from the marker(s)):

```bash
$ create-static-map --width 600 --height 400 -o map2.png -z 14 -m "52.514536,13.350151"
```

![Example 2](https://raw.githubusercontent.com/flopp/flopp.github.io/master/go-staticmaps/map2.png)

A map with two markers (red and green). If there are more than two markers in the map, a *good* zoom level can be determined automatically:

```bash
$ create-static-map --width 600 --height 400 -o map3.png -m "color:red|52.514536,13.350151" -m "color:green|52.516285,13.377746"
```

![Example 3](https://raw.githubusercontent.com/flopp/flopp.github.io/master/go-staticmaps/map3.png)


### Create a map of the Berlin Marathon

    create-static-map --width 800 --height 600 \
      --marker "color:green|52.5153,13.3564" \
      --marker "color:red|52.5160,13.3711" \
      --output "berlin-marathon.png" \
      --path "color:blue|weight:2|gpx:berlin-marathon.gpx"

![Static map of the Berlin Marathon](https://raw.githubusercontent.com/flopp/flopp.github.io/master/go-staticmaps/berlin-marathon.png)

### Create a map of the US capitals

    create-static-map --width 800 --height 400 \
      --output "us-capitals.png" \
      --marker "color:blue|size:tiny|32.3754,-86.2996|58.3637,-134.5721|33.4483,-112.0738|34.7244,-92.2789|\
        38.5737,-121.4871|39.7551,-104.9881|41.7665,-72.6732|39.1615,-75.5136|30.4382,-84.2806|33.7545,-84.3897|\
        21.2920,-157.8219|43.6021,-116.2125|39.8018,-89.6533|39.7670,-86.1563|41.5888,-93.6203|39.0474,-95.6815|\
        38.1894,-84.8715|30.4493,-91.1882|44.3294,-69.7323|38.9693,-76.5197|42.3589,-71.0568|42.7336,-84.5466|\
        44.9446,-93.1027|32.3122,-90.1780|38.5698,-92.1941|46.5911,-112.0205|40.8136,-96.7026|39.1501,-119.7519|\
        43.2314,-71.5597|40.2202,-74.7642|35.6816,-105.9381|42.6517,-73.7551|35.7797,-78.6434|46.8084,-100.7694|\
        39.9622,-83.0007|35.4931,-97.4591|44.9370,-123.0272|40.2740,-76.8849|41.8270,-71.4087|34.0007,-81.0353|\
        44.3776,-100.3177|36.1589,-86.7821|30.2687,-97.7452|40.7716,-111.8882|44.2627,-72.5716|37.5408,-77.4339|\
        47.0449,-122.9016|38.3533,-81.6354|43.0632,-89.4007|41.1389,-104.8165"

![Static map of the US capitals](https://raw.githubusercontent.com/flopp/flopp.github.io/master/go-staticmaps/us-capitals.png)

### Create a map of Australia
...where the Northern Territory is highlighted and the capital Canberra is marked.

    create-static-map --width 800 --height 600 \
      --center="-26.284973,134.303764" \
      --output "australia.png" \
      --marker "color:blue|-35.305200,149.121574" \
      --area "color:0x00FF00|fill:0x00FF007F|weight:2|-25.994024,129.013847|-25.994024,137.989677|-16.537670,138.011649|\
        -14.834820,135.385917|-12.293236,137.033866|-11.174554,130.398124|-12.925791,130.167411|-14.866678,129.002860"

![Static map of Australia](https://raw.githubusercontent.com/flopp/flopp.github.io/master/go-staticmaps/australia.png)

## Acknowledgements
Besides the go standard library, go-staticmaps uses

- [OpenStreetMap](http://openstreetmap.org/), [Thunderforest](http://www.thunderforest.com/), [OpenTopoMap](http://www.opentopomap.org/), [Stamen](http://maps.stamen.com/) and [Carto](http://carto.com) as map tile providers
- [Go Graphics](https://github.com/fogleman/gg) for 2D drawing
- [S2 geometry library](https://github.com/golang/geo) for spherical geometry calculations
- [appdirs](https://github.com/Wessie/appdirs) for platform specific system directories
- [gpxgo](github.com/tkrajina/gpxgo) for loading GPX files
- [go-coordsparser](https://github.com/flopp/go-coordsparser) for parsing geo coordinates

## Contributors
- [Kooper](https://github.com/Kooper): fixed *library usage examples*
- [felix](https://github.com/felix): added *more tile servers*
- [wiless](https://github.com/wiless): suggested to add user definable *marker label colors*
- [noki](https://github.com/Noki): suggested to add a user definable *bounding box*
- [digitocero](https://github.com/digitocero): reported and fixed *type mismatch error*
- [bcicen](https://github.com/bcicen): reported and fixed *syntax error in examples*
- [pshevtsov](https://github.com/pshevtsov): fixed *drawing of empty attribution strings*
- [Luzifer](https://github.com/Luzifer): added *overwritable user agent strings* to comply with the OSM tile usage policy 


## License
Copyright 2016, 2017 Florian Pigorsch & Contributors. All rights reserved.

Use of this source code is governed by a MIT-style license that can be found in the LICENSE file.