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June 6, 2021 06:00
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MapLibre Protocol: PMTiles implementation
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <title>MapLibre GL JS debug page</title> | |
| <meta charset='utf-8'> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| <link rel='stylesheet' href='../dist/maplibre-gl.css' /> | |
| <style> | |
| body { margin: 0; padding: 0; } | |
| html, body, #map { height: 100%; } | |
| </style> | |
| </head> | |
| <body> | |
| <div id='map'></div> | |
| <script src='../dist/maplibre-gl-dev.js'></script> | |
| <script src="https://unpkg.com/pmtiles@latest/index.js"></script> | |
| <script> | |
| // protocol issues | |
| // zxy issues | |
| var style = { | |
| "version": 8, | |
| "sources": { | |
| "tpe_sample": { | |
| "type": "vector", | |
| "tiles": ["pmtiles://https://protomaps-static.sfo3.digitaloceanspaces.com/tpe_sample.pmtiles/{z}/{x}/{y}"], | |
| "maxzoom":14 | |
| } | |
| }, | |
| "layers": [ | |
| { | |
| "id": "buildings", | |
| "type": "fill", | |
| "source":"tpe_sample", | |
| "source-layer":"buildings", | |
| "paint": { | |
| "fill-color":"black" | |
| } | |
| }, | |
| { | |
| "id": "roads", | |
| "type": "line", | |
| "source":"tpe_sample", | |
| "source-layer":"roads", | |
| "paint": { | |
| "line-color":"red" | |
| } | |
| }, | |
| { | |
| "id": "mask", | |
| "type": "fill", | |
| "source":"tpe_sample", | |
| "source-layer":"mask", | |
| "paint": { | |
| "fill-color":"white" | |
| } | |
| } | |
| ] | |
| }; | |
| let re = new RegExp(/pmtiles:\/\/(.+)\/(\d+)\/(\d+)\/(\d+)/) | |
| let pmtiles_instances = new Map() | |
| maplibregl.addProtocol('pmtiles', (params, callback) => { | |
| let result = params.url.match(re) | |
| let pmtiles_url = result[1] | |
| if (!pmtiles_instances.has(pmtiles_url)) { | |
| pmtiles_instances.set(pmtiles_url,new pmtiles.PMTiles(pmtiles_url)) | |
| } | |
| let instance = pmtiles_instances.get(pmtiles_url) | |
| let z = result[2] | |
| let x = result[3] | |
| let y = result[4] | |
| instance.getZxy(+z,+x,+y).then(val => { | |
| if (val) { | |
| let headers = {'Range':'bytes=' + val[0] + '-' + (val[0]+val[1]-1)} | |
| fetch(pmtiles_url,{headers:headers}).then(resp => { | |
| return resp.arrayBuffer() | |
| }).then(arr => { | |
| callback(null,arr,null,null) | |
| }) | |
| } else { | |
| callback(null,new Uint8Array(),null,null) | |
| } | |
| }) | |
| return { cancel: () => { console.log("Cancel not implemented") } }; | |
| }); | |
| var map = new maplibregl.Map({ | |
| container: 'map', | |
| center: [121.5177,25.0412], | |
| zoom: 14, | |
| style: style | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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