sm

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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

How?

Installation

Installing go-staticmaps is as easy as

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

For the command line tool, use

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:

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 for a complete documentation and the source code of the command line tool 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)
  --background=COLOR       Background color (default: transparent)
  -u, --useragent=USERAGENT
                           Overwrite the default HTTP user agent string
  -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. If neither --bbox, --center, nor --zoom are given, the map extent is determined from the specified markers, paths and areas.

--background lets you specify a color used for map areas that are not covered by map tiles (areas north of 85°/south of -85°).

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:

$ create-static-map --width 600 --height 400 -o map1.png -c "52.514536,13.350151" -z 10

Example 1

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)):

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

Example 2

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:

$ 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

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

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

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

Acknowledgements

Besides the go standard library, go-staticmaps uses

Contributors

  • Kooper: fixed library usage examples
  • felix: added more tile servers
  • wiless: suggested to add user definable marker label colors
  • noki: suggested to add a user definable bounding box
  • digitocero: reported and fixed type mismatch error
  • bcicen: reported and fixed syntax error in examples
  • pshevtsov: fixed drawing of empty attribution strings
  • 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.

Documentation

Overview

Package sm (~ static maps) renders static map images from OSM tiles with markers, paths, and filled areas.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func CanDisplay 

func CanDisplay(pos s2.LatLng) bool

CanDisplay checks if pos is generally displayable (i.e. its latitude is in [-85,85])

func CreateBBox 

func CreateBBox(nwlat float64, nwlng float64, selat float64, selng float64) (*s2.Rect, error)

CreateBBox creates a bounding box from a north-western point (lat/lng in degrees) and a south-eastern point (lat/lng in degrees). Note that you can create a bounding box wrapping over the antimeridian at lng=+-/180° by nwlng > selng.

func GetTileProviders 

func GetTileProviders() map[string]*TileProvider

GetTileProviders returns a map of all available TileProviders

func Luminance 

func Luminance(col color.Color) float64

Luminance computes the luminance (~ brightness) of the given color. Range: 0.0 for black to 1.0 for white.

func ParseColorString 

func ParseColorString(s string) (color.Color, error)

ParseColorString parses hex color strings (i.e. `0xRRGGBB`, `#RRGGBB`, `0xRRGGBBAA`, `#RRGGBBAA`), and names colors (e.g. 'black', 'blue', ...)

Types

type Area 

type Area struct {
	MapObject
	Positions []s2.LatLng
	Color     color.Color
	Fill      color.Color
	Weight    float64
}

Area represents a area or area on the map

func ParseAreaString 

func ParseAreaString(s string) (*Area, error)

ParseAreaString parses a string and returns an area

type Context 

type Context struct {
	// contains filtered or unexported fields
}

Context holds all information about the map image that is to be rendered

func NewContext 

func NewContext() *Context

NewContext creates a new instance of Context

func (*Context) AddArea 

func (m *Context) AddArea(area *Area)

AddArea adds an area to the Context

func (*Context) AddMarker 

func (m *Context) AddMarker(marker *Marker)

AddMarker adds a marker to the Context

func (*Context) AddPath 

func (m *Context) AddPath(path *Path)

AddPath adds a path to the Context

func (*Context) ClearAreas 

func (m *Context) ClearAreas()

ClearAreas removes all areas from the Context

func (*Context) ClearMarkers 

func (m *Context) ClearMarkers()

ClearMarkers removes all markers from the Context

func (*Context) ClearPaths 

func (m *Context) ClearPaths()

ClearPaths removes all paths from the Context

func (*Context) GetTiles 

func (m *Context) GetTiles(cancel <-chan struct{}) (tiles <-chan Tile, zoom int)

GetTiles requests a set of tiles, which will be sent over the returned channel. The channel will closed when all tiles have been returned.

func (*Context) Render 

func (m *Context) Render() (image.Image, error)

Render actually renders the map image including all map objects (markers, paths, areas)

func (*Context) RenderWithBounds 

func (m *Context) RenderWithBounds() (image.Image, s2.Rect, error)

RenderWithBounds actually renders the map image including all map objects (markers, paths, areas) returned image covers requested area as well as any tiles necessary to cover that area, which may be larger than the request

Specific bounding box of as-returned image is provided to support image registratino with other data

func (*Context) SetBackground 

func (m *Context) SetBackground(col color.Color)

SetBackground sets the background color (used as a fallback for areas without map tiles)

func (*Context) SetBoundingBox 

func (m *Context) SetBoundingBox(bbox s2.Rect)

SetBoundingBox sets the bounding box

func (*Context) SetCenter 

func (m *Context) SetCenter(center s2.LatLng)

SetCenter sets the center coordinates

func (*Context) SetSize 

func (m *Context) SetSize(width, height int)

SetSize sets the size of the generated image

func (*Context) SetTileProvider 

func (m *Context) SetTileProvider(t *TileProvider)

SetTileProvider sets the TileProvider to be used

func (*Context) SetUserAgent 

func (m *Context) SetUserAgent(a string)

SetUserAgent sets the HTTP user agent string used when downloading map tiles

func (*Context) SetZoom 

func (m *Context) SetZoom(zoom int)

SetZoom sets the zoom level

type MapObject 

type MapObject interface {
	// contains filtered or unexported methods
}

MapObject is the interface for all objects on the map

type Marker 

type Marker struct {
	MapObject
	Position   s2.LatLng
	Color      color.Color
	Size       float64
	Label      string
	LabelColor color.Color
}

Marker represents a marker on the map

func NewMarker 

func NewMarker(pos s2.LatLng, col color.Color, size float64) *Marker

NewMarker creates a new Marker

func ParseMarkerString 

func ParseMarkerString(s string) ([]*Marker, error)

ParseMarkerString parses a string and returns an array of markers

func (*Marker) SetLabelColor 

func (m *Marker) SetLabelColor(col color.Color)

SetLabelColor sets the color of the marker's text label

type Path 

type Path struct {
	MapObject
	Positions []s2.LatLng
	Color     color.Color
	Weight    float64
}

Path represents a path or area on the map

func ParsePathString 

func ParsePathString(s string) ([]*Path, error)

ParsePathString parses a string and returns a path

type Tile 

type Tile struct {
	image.Image       // Image is data in this tile
	s2.Rect           // Rect provides the Lat/Lng bounding box for this tile
	Err         error // Err reports any error attempting to retrieve this tile
}

Tile represents an image tile with an associated lat/lng boundign rectangle

type TileFetcher 

type TileFetcher struct {
	// contains filtered or unexported fields
}

TileFetcher downloads map tile images from a TileProvider

func NewTileFetcher 

func NewTileFetcher(tileProvider *TileProvider) *TileFetcher

NewTileFetcher creates a new Tilefetcher struct

func (*TileFetcher) Fetch 

func (t *TileFetcher) Fetch(zoom, x, y int) (image.Image, error)

Fetch download (or retrieves from the cache) a tile image for the specified zoom level and tile coordinates

func (*TileFetcher) SetUserAgent 

func (t *TileFetcher) SetUserAgent(a string)

SetUserAgent sets the HTTP user agent string used when downloading map tiles

func (*TileFetcher) ToggleCaching 

func (t *TileFetcher) ToggleCaching(enabled bool)

ToggleCaching enables/disables caching

type TileProvider 

type TileProvider struct {
	Name        string
	Attribution string
	TileSize    int
	URLPattern  string // "%[1]s" => shard, "%[2]d" => zoom, "%[3]d" => x, "%[4]d" => y
	Shards      []string
}

TileProvider encapsulates all infos about a map tile provider service (name, url scheme, attribution, etc.)

func NewTileProviderCartoDark 

func NewTileProviderCartoDark() *TileProvider

NewTileProviderCartoDark creates a TileProvider struct for Carto's tile service (dark variant)

func NewTileProviderCartoLight 

func NewTileProviderCartoLight() *TileProvider

NewTileProviderCartoLight creates a TileProvider struct for Carto's tile service (light variant)

func NewTileProviderOpenCycleMap 

func NewTileProviderOpenCycleMap() *TileProvider

NewTileProviderOpenCycleMap creates a TileProvider struct for OpenCycleMap's tile service

func NewTileProviderOpenStreetMaps 

func NewTileProviderOpenStreetMaps() *TileProvider

NewTileProviderOpenStreetMaps creates a TileProvider struct for OSM's tile service

func NewTileProviderOpenTopoMap 

func NewTileProviderOpenTopoMap() *TileProvider

NewTileProviderOpenTopoMap creates a TileProvider struct for opentopomap's tile service

func NewTileProviderStamenTerrain 

func NewTileProviderStamenTerrain() *TileProvider

NewTileProviderStamenTerrain creates a TileProvider struct for stamens' 'terrain' tile service

func NewTileProviderStamenToner 

func NewTileProviderStamenToner() *TileProvider

NewTileProviderStamenToner creates a TileProvider struct for stamens' 'toner' tile service

func NewTileProviderThunderforestLandscape 

func NewTileProviderThunderforestLandscape() *TileProvider

NewTileProviderThunderforestLandscape creates a TileProvider struct for thundeforests's 'landscape' tile service

func NewTileProviderThunderforestOutdoors 

func NewTileProviderThunderforestOutdoors() *TileProvider

NewTileProviderThunderforestOutdoors creates a TileProvider struct for thundeforests's 'outdoors' tile service

func NewTileProviderThunderforestTransport 

func NewTileProviderThunderforestTransport() *TileProvider

NewTileProviderThunderforestTransport creates a TileProvider struct for thundeforests's 'transport' tile service

func NewTileProviderWikimedia 

func NewTileProviderWikimedia() *TileProvider

NewTileProviderWikimedia creates a TileProvider struct for Wikimedia's tile service

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