Feature: offline basemaps: first working version (without ability to install basemaps from the UI)

scripts/generatePmTilesExtractionScript.ts

@@ -0,0 +1,39 @@
+import Script from "./Script"
+import { Tiles } from "../src/Models/TileRange"
+
+class GeneratePmTilesExtractionScript extends Script {
+
+    constructor() {
+        super("Generates a bash script to extract all subpyramids of maxzoom=8 from planet-latest.pmtiles")
+    }
+
+    private emitRange(z: number, x: number, y: number, maxzoom?: number): string {
+        const [[max_lat, min_lon], [min_lat, max_lon]] = Tiles.tile_bounds(z, x, y)
+        let maxzoomflag = ""
+        if(maxzoom !== undefined){
+            maxzoomflag = " --maxzoom="+maxzoom
+        }
+        return (`./pmtiles extract planet-latest.pmtiles --minzoom=${z}${maxzoomflag} --bbox=${[min_lon, min_lat + 0.0001, max_lon, max_lat].join(",")} ${z}-${x}-${y}.pmtiles`)
+    }
+
+    private generateField(z: number, maxzoom?:number){
+        const boundary = 2 << z
+        for (let x = 0; x < boundary; x++) {
+            const xCommands = []
+            for (let y = 0; y < boundary; y++) {
+                xCommands.push(this.emitRange(z, x, y,maxzoom))
+            }
+            console.log(xCommands.join(" && ") + " && echo 'All pyramids for x = " + x + " are generated' & ")
+        }
+
+    }
+
+    async main(): Promise<void> {
+        this.generateField(0, 4)
+        this.generateField(5, 8)
+        this.generateField(9)
+    }
+
+}
+
+new GeneratePmTilesExtractionScript().run()