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feat: allow static map as tile provider
- make TileProvider interface - add StaticMapProvider implementation - add static google map example
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
|
|
||
| sm "github.com/flopp/go-staticmaps" | ||
| "github.com/fogleman/gg" | ||
| "github.com/golang/geo/s2" | ||
| ) | ||
|
|
||
| const googleStaticMapURL = "https://maps.googleapis.com/maps/api/staticmap?" | ||
|
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| // GMapOption . | ||
| type GMapOption func(*GMapOptions) | ||
|
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| // GMapOptions . | ||
| type GMapOptions struct { | ||
| clientID string | ||
| signature string | ||
| key string | ||
| styles []string | ||
| } | ||
|
|
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| // GoogleClientID . | ||
| func GMapClientID(clientID, signature string) GMapOption { | ||
| return func(gmo *GMapOptions) { | ||
| gmo.clientID = clientID | ||
| gmo.signature = signature | ||
| } | ||
| } | ||
|
|
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| // GMapKey . | ||
| func GMapKey(key string) GMapOption { | ||
| return func(gmo *GMapOptions) { | ||
| gmo.key = key | ||
| } | ||
| } | ||
|
|
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| // GMapStyles . | ||
| func GMapStyles(styles ...string) GMapOption { | ||
| return func(gmo *GMapOptions) { | ||
| gmo.styles = append(gmo.styles, styles...) | ||
| } | ||
| } | ||
|
|
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| func GMapTileProvider(options ...GMapOption) sm.TileProvider { | ||
| // default option | ||
| opt := &GMapOptions{ | ||
| styles: make([]string, 0), | ||
| } | ||
|
|
||
| for _, option := range options { | ||
| option(opt) | ||
| } | ||
|
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| t := new(gMapProvider) | ||
| t.name = "google-map" | ||
| t.attribution = "Google Map (inc)" | ||
| t.options = opt | ||
|
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| return t | ||
| } | ||
|
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| // gMapProvider . | ||
| type gMapProvider struct { | ||
| name string | ||
| attribution string | ||
| options *GMapOptions | ||
| } | ||
|
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| func (p *gMapProvider) Name() string { | ||
| return p.name | ||
| } | ||
|
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| func (p *gMapProvider) Attribution() string { | ||
| return p.attribution | ||
| } | ||
|
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| func (p *gMapProvider) GetURL(zoom int, x, y float64, width, height int) string { | ||
| // construct google static map url | ||
| var url string | ||
| if p.options.key != "" { | ||
| url = googleStaticMapURL + "key=" + p.options.key | ||
| } else { | ||
| url = googleStaticMapURL + "client-id=" + p.options.clientID + "&signature=" + p.options.signature | ||
| } | ||
|
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| if width > 0 && height > 0 { | ||
| url += fmt.Sprintf("&size=%dx%d", width, height) | ||
| } | ||
|
|
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| if x > 0 && y > 0 { | ||
| url += fmt.Sprintf("¢er=%f,%f", y, x) | ||
| } | ||
|
|
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| if zoom > 0 { | ||
| url += fmt.Sprintf("&zoom=%d", zoom) | ||
| } | ||
|
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| return url | ||
| } | ||
|
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| func main() { | ||
| ctx := sm.NewContext() | ||
| ctx.SetSize(400, 300) | ||
| ctx.SetCenter(s2.LatLngFromDegrees(1.3011624468555132, 103.85775516239742)) | ||
| ctx.SetZoom(17) | ||
| ctx.SetTileProvider( | ||
| GMapTileProvider( | ||
| GMapKey(os.Getenv("GOOGLE_MAP_KEY")), | ||
| ), | ||
| ) | ||
|
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||
| img, err := ctx.Render() | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| if err := gg.SavePNG("google-map.png", img); err != nil { | ||
| panic(err) | ||
| } | ||
| } |
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