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Caching Geo Tile Server using graceful, httpcache and gfx.
package main
import (
"flag"
"io/ioutil"
"net/http"
"net/url"
"os"
"strconv"
"github.com/TV4/graceful"
"github.com/gregjones/httpcache"
"github.com/gregjones/httpcache/diskcache"
"github.com/peterhellberg/gfx"
)
const (
defaultTileSize = 512
defaultFormat = "https://a.basemaps.cartocdn.com/rastertiles/voyager/%d/%d/%d@2x.png"
defaultPort = "2019"
)
type server struct {
*http.Client
gfx.GeoTileServer
}
func (s *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
gt := geoTile(r)
rawurl := gt.Rawurl(s.Format)
resp, err := s.Get(rawurl)
if err != nil {
return
}
defer resp.Body.Close()
if b, err := ioutil.ReadAll(resp.Body); err == nil {
gfx.Log("%#v from %s", gt, rawurl)
w.Header().Set("Content-Type", resp.Header.Get("Content-Type"))
w.Header().Set("Content-Length", resp.Header.Get("Content-Length"))
w.Header().Set("Cache-Control", resp.Header.Get("Cache-Control"))
w.Header().Set("X-From-Cache", resp.Header.Get("X-From-Cache"))
w.Header().Set("Server", resp.Header.Get("Server"))
w.Header().Set("Date", resp.Header.Get("Date"))
w.WriteHeader(resp.StatusCode)
w.Write(b)
}
}
func main() {
var tileSize int
var format string
flag.IntVar(&tileSize, "tileSize", defaultTileSize, "")
flag.StringVar(&format, "format", defaultFormat, "")
flag.Parse()
c := diskcache.New("data/")
t := httpcache.NewTransport(c)
graceful.LogListenAndServe(&http.Server{
Addr: addr(),
Handler: &server{
Client: t.Client(),
GeoTileServer: gfx.GTS(tileSize, format),
},
})
}
func geoTile(r *http.Request) gfx.GeoTile {
q := r.URL.Query()
return gfx.GT(getInt(q, "zoom"), getInt(q, "x"), getInt(q, "y"))
}
func getInt(q url.Values, name string) int {
i, _ := strconv.Atoi(q.Get(name))
return i
}
func addr() string {
if port := os.Getenv("PORT"); port != "" {
return ":" + port
}
return ":" + defaultPort
}
@peterhellberg
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package main

import "github.com/peterhellberg/gfx"

const (
	zoomLevels = 18
	tileSize   = 512
	tileFormat = "http://0.0.0.0:2019?zoom=%d&x=%d&y=%d"
)

func main() {
	p := gfx.GP(59.270889, 18.048125)
	s := gfx.GTS(tileSize, tileFormat)
	a := gfx.Animation{Delay: 50, LoopCount: -1}

	for zoom := 0; zoom < zoomLevels; zoom++ {
		dst := gfx.NewImage(tileSize/2+tileSize, tileSize/2+tileSize, PaletteBasemaps[28])

		s.DrawTileAndNeighbors(dst, p.GeoTile(zoom), p)

		gfx.DrawCircleFilled(dst, gfx.BoundsCenter(dst.Bounds()), 2, gfx.ColorBlack)

		a.AddFrame(dst, append(PaletteBasemaps, gfx.ColorMagenta).AsColorPalette())
	}

	a.SaveGIF("gfx-geo-tiles-carto-basemaps-animated.gif")
}

var PaletteBasemaps = gfx.Palette{
	{0x41, 0x5C, 0x77, 0xFF},
	{0x56, 0x6E, 0x85, 0xFF},
	{0x68, 0x7D, 0x91, 0xFF},
	{0x87, 0x91, 0x9D, 0xFF},
	{0x8B, 0x94, 0xA0, 0xFF},
	{0x95, 0x9F, 0xAA, 0xFF},
	{0x96, 0xA4, 0xB0, 0xFF},
	{0x9B, 0xA3, 0xAD, 0xFF},
	{0xA4, 0xAB, 0xB3, 0xFF},
	{0xAE, 0xCE, 0xD4, 0xFF},
	{0xB3, 0xD1, 0xD6, 0xFF},
	{0xB9, 0xBF, 0xC5, 0xFF},
	{0xBB, 0xD6, 0xDB, 0xFF},
	{0xBC, 0xD4, 0xD5, 0xFF},
	{0xBE, 0xC3, 0xC8, 0xFF},
	{0xC0, 0xDB, 0xE0, 0xFF},
	{0xC2, 0xC9, 0xCE, 0xFF},
	{0xC3, 0xDC, 0xE1, 0xFF},
	{0xC6, 0xDE, 0xE2, 0xFF},
	{0xC8, 0xE0, 0xE4, 0xFF},
	{0xC9, 0xD6, 0xC9, 0xFF},
	{0xCB, 0xE0, 0xE3, 0xFF},
	{0xCB, 0xE1, 0xE5, 0xFF},
	{0xCD, 0xCC, 0xCA, 0xFF},
	{0xCE, 0xE3, 0xE6, 0xFF},
	{0xD1, 0xE5, 0xE9, 0xFF},
	{0xD3, 0xE6, 0xEA, 0xFF},
	{0xD5, 0xE3, 0xD7, 0xFF},
	{0xD5, 0xE8, 0xEB, 0xFF},
	{0xD7, 0xD8, 0xD9, 0xFF},
	{0xD9, 0xE7, 0xCE, 0xFF},
	{0xDA, 0xE8, 0xCF, 0xFF},
	{0xDC, 0xE9, 0xDB, 0xFF},
	{0xDD, 0xE0, 0xE0, 0xFF},
	{0xDF, 0xDE, 0xDD, 0xFF},
	{0xE1, 0xC7, 0xC9, 0xFF},
	{0xE1, 0xE0, 0xDF, 0xFF},
	{0xE2, 0xEB, 0xEB, 0xFF},
	{0xE2, 0xED, 0xD8, 0xFF},
	{0xE3, 0xE1, 0xDA, 0xFF},
	{0xE3, 0xE2, 0xE0, 0xFF},
	{0xE3, 0xE5, 0xE4, 0xFF},
	{0xE3, 0xEC, 0xD9, 0xFF},
	{0xE4, 0xDC, 0xD1, 0xFF},
	{0xE4, 0xE3, 0xE0, 0xFF},
	{0xE5, 0xDB, 0xC7, 0xFF},
	{0xE5, 0xEE, 0xDB, 0xFF},
	{0xE5, 0xEE, 0xED, 0xFF},
	{0xE6, 0xE5, 0xE1, 0xFF},
	{0xE6, 0xEF, 0xDD, 0xFF},
	{0xE7, 0xDA, 0xC8, 0xFF},
	{0xE7, 0xDB, 0xCA, 0xFF},
	{0xE7, 0xE0, 0xD5, 0xFF},
	{0xE8, 0xDB, 0xB8, 0xFF},
	{0xE8, 0xF0, 0xDD, 0xFF},
	{0xE9, 0xD6, 0xD6, 0xFF},
	{0xE9, 0xE9, 0xE9, 0xFF},
	{0xE9, 0xF0, 0xDF, 0xFF},
	{0xEA, 0xD5, 0xD7, 0xFF},
	{0xEA, 0xE2, 0xD6, 0xFF},
	{0xEA, 0xE4, 0xDF, 0xFF},
	{0xEB, 0xDD, 0xC9, 0xFF},
	{0xEB, 0xE4, 0xDA, 0xFF},
	{0xEB, 0xEB, 0xE8, 0xFF},
	{0xEC, 0xE2, 0xDD, 0xFF},
	{0xEC, 0xF1, 0xEE, 0xFF},
	{0xED, 0xE7, 0xDD, 0xFF},
	{0xED, 0xF2, 0xE4, 0xFF},
	{0xEE, 0xDD, 0xDE, 0xFF},
	{0xEE, 0xE1, 0xCE, 0xFF},
	{0xEE, 0xE5, 0xE3, 0xFF},
	{0xEE, 0xE9, 0xCE, 0xFF},
	{0xEE, 0xEE, 0xEC, 0xFF},
	{0xEE, 0xF2, 0xF1, 0xFF},
	{0xEF, 0xEA, 0xE0, 0xFF},
	{0xEF, 0xEE, 0xEA, 0xFF},
	{0xF0, 0xEE, 0xE7, 0xFF},
	{0xF1, 0xE6, 0xD6, 0xFF},
	{0xF1, 0xEE, 0xE3, 0xFF},
	{0xF1, 0xF2, 0xEE, 0xFF},
	{0xF2, 0xE6, 0xE5, 0xFF},
	{0xF2, 0xE9, 0xDA, 0xFF},
	{0xF2, 0xF0, 0xEA, 0xFF},
	{0xF2, 0xF5, 0xF8, 0xFF},
	{0xF3, 0xF6, 0xED, 0xFF},
	{0xF4, 0xEB, 0xD4, 0xFF},
	{0xF4, 0xEC, 0xE0, 0xFF},
	{0xF4, 0xF2, 0xEE, 0xFF},
	{0xF5, 0xED, 0xE3, 0xFF},
	{0xF5, 0xF3, 0xF0, 0xFF},
	{0xF5, 0xF5, 0xF2, 0xFF},
	{0xF6, 0xEF, 0xE5, 0xFF},
	{0xF6, 0xF0, 0xE5, 0xFF},
	{0xF6, 0xF4, 0xEB, 0xFF},
	{0xF6, 0xF6, 0xF5, 0xFF},
	{0xF7, 0xF1, 0xE7, 0xFF},
	{0xF8, 0xDD, 0xAA, 0xFF},
	{0xF8, 0xF2, 0xEE, 0xFF},
	{0xF8, 0xF4, 0xEB, 0xFF},
	{0xF9, 0xE0, 0xAF, 0xFF},
	{0xF9, 0xE6, 0xC3, 0xFF},
	{0xF9, 0xF6, 0xEE, 0xFF},
	{0xF9, 0xF6, 0xEF, 0xFF},
	{0xFA, 0xDC, 0x9E, 0xFF},
	{0xFA, 0xDD, 0xA1, 0xFF},
	{0xFA, 0xE4, 0xBC, 0xFF},
	{0xFA, 0xE7, 0xC0, 0xFF},
	{0xFB, 0xED, 0xD2, 0xFF},
	{0xFB, 0xEE, 0xD5, 0xFF},
	{0xFB, 0xF8, 0xF3, 0xFF},
	{0xFC, 0xE1, 0xA4, 0xFF},
	{0xFC, 0xF2, 0xE3, 0xFF},
	{0xFC, 0xFA, 0xF6, 0xFF},
	{0xFD, 0xEB, 0xCE, 0xFF},
	{0xFD, 0xEC, 0xD0, 0xFF},
	{0xFD, 0xEF, 0xD6, 0xFF},
	{0xFD, 0xFB, 0xF6, 0xFF},
	{0xFE, 0xE8, 0xA9, 0xFF},
	{0xFE, 0xF8, 0xED, 0xFF},
	{0xFE, 0xF9, 0xEF, 0xFF},
	{0xFE, 0xFC, 0xDA, 0xFF},
	{0xFF, 0xE8, 0xB7, 0xFF},
	{0xFF, 0xFF, 0xFE, 0xFF},
}

@peterhellberg
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gfx-geo-tiles-carto-basemaps-animated

@peterhellberg
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package main

import "github.com/peterhellberg/gfx"

const (
	zoomLevels = 18
	tileSize   = 512
	tileFormat = "http://0.0.0.0:2019?zoom=%d&x=%d&y=%d"
)

func main() {
	p := gfx.GP(59.270889, 18.048125)
	s := gfx.GTS(tileSize, tileFormat)
	a := gfx.Animation{Delay: 30, LoopCount: -1}

	cp := gfx.PaletteBasemaps.AsColorPalette()

	for zoom := 2; zoom < zoomLevels; zoom++ {
		dst := gfx.NewImage(tileSize/2+tileSize, tileSize/2+tileSize)

		s.DrawTileAndNeighbors(dst, p.GeoTile(zoom), p)

		gfx.DrawCircleFilled(dst, gfx.BoundsCenter(dst.Bounds()), 2, gfx.ColorBlack)

		a.AddFrame(dst, cp)
	}

	a.SaveGIF("gfx-geo-tiles-carto-basemaps-animated.gif")
}

@peterhellberg
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gfx-geo-tiles-carto-basemaps-animated

@peterhellberg
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gfx-geo-tiles-stamen-toner

@peterhellberg
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gfx-tiles-osmand

@peterhellberg
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Comparison of a few different tilesets: http://mapstyle.petschge.de/

@peterhellberg
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@peterhellberg
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var PaletteOsmand = gfx.Palette{
	{0x00, 0x92, 0xDA, 0xFF},
	{0x0B, 0x0C, 0xFD, 0xFF},
	{0x11, 0x11, 0xFE, 0xFF},
	{0x16, 0x16, 0xFC, 0xFF},
	{0x18, 0x18, 0xFD, 0xFF},
	{0x1B, 0x1A, 0x1A, 0xFF},
	{0x1E, 0x9F, 0xDD, 0xFF},
	{0x3B, 0x3B, 0x3A, 0xFF},
	{0x41, 0xAD, 0xE2, 0xFF},
	{0x44, 0xB5, 0x53, 0xFF},
	{0x45, 0xB6, 0x54, 0xFF},
	{0x45, 0xB7, 0x54, 0xFF},
	{0x4A, 0x4A, 0x4A, 0xFF},
	{0x4F, 0xB3, 0xE3, 0xFF},
	{0x50, 0xB1, 0xE1, 0xFF},
	{0x57, 0x57, 0x57, 0xFF},
	{0x5E, 0xBB, 0x5C, 0xFF},
	{0x5E, 0xBC, 0x5C, 0xFF},
	{0x60, 0x5F, 0x5E, 0xFF},
	{0x68, 0xBE, 0x5F, 0xFF},
	{0x74, 0x4C, 0x0B, 0xFF},
	{0x75, 0xC3, 0xEA, 0xFF},
	{0x78, 0x51, 0x12, 0xFF},
	{0x79, 0x81, 0xB0, 0xFF},
	{0x80, 0x80, 0x80, 0xFF},
	{0x83, 0x7B, 0x7B, 0xFF},
	{0x87, 0x86, 0x86, 0xFF},
	{0x87, 0x86, 0xF3, 0xFF},
	{0x87, 0xC4, 0x6A, 0xFF},
	{0x8C, 0xC3, 0x6B, 0xFF},
	{0x8D, 0xC5, 0x6C, 0xFF},
	{0x8F, 0xC5, 0x70, 0xFF},
	{0x91, 0x8D, 0x87, 0xFF},
	{0x91, 0x91, 0x91, 0xFF},
	{0x94, 0x76, 0x4D, 0xFF},
	{0x96, 0x77, 0x46, 0xFF},
	{0x99, 0x99, 0x99, 0xFF},
	{0xA0, 0xD2, 0xED, 0xFF},
	{0xA1, 0xA0, 0x9E, 0xFF},
	{0xA2, 0x89, 0x69, 0xFF},
	{0xA7, 0xA4, 0xA6, 0xFF},
	{0xAA, 0x87, 0xA6, 0xFF},
	{0xAF, 0x9A, 0xA8, 0xFF},
	{0xB0, 0x9F, 0x91, 0xFF},
	{0xB4, 0xB3, 0xB2, 0xFF},
	{0xB7, 0xAE, 0xB5, 0xFF},
	{0xBA, 0xA8, 0xA0, 0xFF},
	{0xBB, 0xBB, 0xBB, 0xFF},
	{0xBB, 0xBC, 0xBB, 0xFF},
	{0xBD, 0xAA, 0x8C, 0xFF},
	{0xBD, 0xBD, 0xBD, 0xFF},
	{0xBE, 0xBE, 0xBE, 0xFF},
	{0xC0, 0xAF, 0xAF, 0xFF},
	{0xC1, 0xB0, 0xB0, 0xFF},
	{0xC1, 0xB6, 0xC6, 0xFF},
	{0xC2, 0xB1, 0xB0, 0xFF},
	{0xC2, 0xB2, 0xB1, 0xFF},
	{0xC2, 0xB3, 0xB2, 0xFF},
	{0xC2, 0xB3, 0xC2, 0xFF},
	{0xC2, 0xBF, 0xB3, 0xFF},
	{0xC4, 0xDD, 0xE5, 0xFF},
	{0xC7, 0xC6, 0xC6, 0xFF},
	{0xCC, 0x5F, 0xA3, 0xFF},
	{0xCC, 0xCC, 0xCC, 0xFF},
	{0xCD, 0xF1, 0xF3, 0xFF},
	{0xD3, 0xD1, 0xCF, 0xFF},
	{0xD5, 0x25, 0x98, 0xFF},
	{0xD7, 0xB4, 0xDA, 0xFF},
	{0xD8, 0xB7, 0xDB, 0xFF},
	{0xD9, 0x05, 0x93, 0xFF},
	{0xD9, 0x93, 0x80, 0xFF},
	{0xDA, 0x96, 0x80, 0xFF},
	{0xDA, 0xDA, 0xDA, 0xFF},
	{0xDD, 0xDD, 0xDD, 0xFF},
	{0xDF, 0xD8, 0xB2, 0xFF},
	{0xE1, 0xC8, 0xE3, 0xFF},
	{0xE6, 0xBD, 0x7E, 0xFF},
	{0xE6, 0xCB, 0xC8, 0xFF},
	{0xE9, 0xE6, 0xE1, 0xFF},
	{0xE9, 0xEC, 0xE3, 0xFF},
	{0xEB, 0xEB, 0xEA, 0xFF},
	{0xED, 0xB0, 0xA4, 0xFF},
	{0xF2, 0xEF, 0xE9, 0xFF},
	{0xF3, 0xEB, 0xB4, 0xFF},
	{0xF5, 0xF3, 0xF1, 0xFF},
	{0xF6, 0xF5, 0xF5, 0xFF},
	{0xF7, 0xA2, 0x97, 0xFF},
	{0xF8, 0x88, 0x7C, 0xFF},
	{0xF9, 0x82, 0x75, 0xFF},
	{0xF9, 0x84, 0x76, 0xFF},
	{0xFD, 0xFC, 0xFD, 0xFF},
	{0xFF, 0xD0, 0x80, 0xFF},
	{0xFF, 0xFF, 0xFF, 0xFF},
}

var PaletteHikeBike = gfx.Palette{
	{0x19, 0x9B, 0xD5, 0xFF},
	{0x27, 0xA0, 0xD3, 0xFF},
	{0x3A, 0x3A, 0x3A, 0xFF},
	{0x56, 0x56, 0x56, 0xFF},
	{0x57, 0xB2, 0xCD, 0xFF},
	{0x6C, 0x6C, 0xF4, 0xFF},
	{0x75, 0x62, 0x5E, 0xFF},
	{0x79, 0x82, 0xB0, 0xFF},
	{0x81, 0x88, 0xFB, 0xFF},
	{0x83, 0x83, 0x83, 0xFF},
	{0x88, 0x9B, 0xAC, 0xFF},
	{0x92, 0x92, 0x92, 0xFF},
	{0x97, 0xB7, 0x9B, 0xFF},
	{0x98, 0x97, 0x95, 0xFF},
	{0x99, 0x99, 0x99, 0xFF},
	{0x9B, 0x79, 0x72, 0xFF},
	{0x9D, 0xD3, 0x9D, 0xFF},
	{0xA5, 0x8B, 0x60, 0xFF},
	{0xA6, 0x8C, 0x62, 0xFF},
	{0xA8, 0xA8, 0xA8, 0xFF},
	{0xAA, 0x92, 0x6B, 0xFF},
	{0xAB, 0xD4, 0xD5, 0xFF},
	{0xAC, 0xCD, 0x9F, 0xFF},
	{0xAE, 0xC2, 0xF9, 0xFF},
	{0xAE, 0xD5, 0xD6, 0xFF},
	{0xAF, 0x96, 0x74, 0xFF},
	{0xB0, 0xD7, 0xA9, 0xFF},
	{0xB1, 0xCF, 0xAB, 0xFF},
	{0xB3, 0xCF, 0xA7, 0xFF},
	{0xB5, 0xCA, 0xF9, 0xFF},
	{0xB6, 0xB6, 0xB6, 0xFF},
	{0xB6, 0xCA, 0xF7, 0xFF},
	{0xBC, 0xCE, 0xB5, 0xFF},
	{0xBC, 0xD1, 0xBC, 0xFF},
	{0xBC, 0xDD, 0xEA, 0xFF},
	{0xBE, 0xD7, 0xB1, 0xFF},
	{0xC0, 0xD5, 0xB3, 0xFF},
	{0xC2, 0xC2, 0xEE, 0xFF},
	{0xC4, 0xC4, 0xC3, 0xFF},
	{0xC9, 0xE4, 0xF9, 0xFF},
	{0xCB, 0xDD, 0xD2, 0xFF},
	{0xCC, 0xCC, 0xCC, 0xFF},
	{0xCF, 0xE2, 0xEF, 0xFF},
	{0xD4, 0xD0, 0xC7, 0xFF},
	{0xD6, 0xE1, 0xE8, 0xFF},
	{0xD7, 0xDC, 0xC6, 0xFF},
	{0xD7, 0xDD, 0xD1, 0xFF},
	{0xD8, 0xDF, 0xC8, 0xFF},
	{0xD9, 0x9E, 0x91, 0xFF},
	{0xD9, 0xE0, 0xC9, 0xFF},
	{0xDC, 0xA2, 0x90, 0xFF},
	{0xDE, 0xE0, 0xD7, 0xFF},
	{0xDE, 0xE1, 0xE2, 0xFF},
	{0xDE, 0xE5, 0xB9, 0xFF},
	{0xDF, 0xE0, 0xDC, 0xFF},
	{0xE0, 0xD4, 0xBF, 0xFF},
	{0xE0, 0xD5, 0xBC, 0xFF},
	{0xE0, 0xE0, 0xDD, 0xFF},
	{0xE0, 0xE1, 0xE0, 0xFF},
	{0xE1, 0xE1, 0xE0, 0xFF},
	{0xE2, 0xDC, 0xBC, 0xFF},
	{0xE5, 0xE3, 0xE1, 0xFF},
	{0xE7, 0xD2, 0xA7, 0xFF},
	{0xF5, 0xE8, 0xAF, 0xFF},
	{0xF5, 0xEC, 0xB2, 0xFF},
	{0xF6, 0xEE, 0xB6, 0xFF},
	{0xF6, 0xF8, 0xDB, 0xFF},
	{0xF8, 0xC0, 0x7B, 0xFF},
	{0xFD, 0xBC, 0x70, 0xFF},
}

@peterhellberg
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hydda tileset + PaletteHikeBike:

gfx-geo-tiles-hydda-palettehikebike

@peterhellberg
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gfx-geo-tiles-hydda

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