ol-pmtiles/dist/cjs/index.cjs.map

PMTiles sources for OpenLayers

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see import style (.js) at https://openlayers.org/en/latest/examples/data-tiles.html\nimport { type Data } from \"ol/DataTile.js\";\nimport {\n  type Options as DataTileSourceOptions,\n  default as DataTileSource,\n} from \"ol/source/DataTile.js\";\nimport TileState from \"ol/TileState.js\";\nimport { MVT } from \"ol/format.js\";\nimport type TileSource from \"ol/source/Tile.js\";\nimport { type Extent } from \"ol/extent.js\";\nimport type Projection from \"ol/proj/Projection.js\";\nimport type Tile from \"ol/Tile.js\";\nimport type VectorTile from \"ol/VectorTile.js\";\nimport {\n  type Options as VectorTileSourceOptions,\n  default as VectorTileSource,\n} from \"ol/source/VectorTile.js\";\nimport type RenderFeature from \"ol/render/Feature.js\";\nimport { createXYZ, extentFromProjection } from \"ol/tilegrid.js\";\nimport { PMTiles, Header, Source } from \"pmtiles\";\n\nexport class PMTilesRasterSource extends DataTileSource {\n  loadImage = (src: string): Promise<HTMLImageElement> => {\n    return new Promise((resolve, reject) => {\n      const img = new Image();\n      img.addEventListener(\"load\", () => resolve(img));\n      img.addEventListener(\"error\", () => reject(new Error(\"load failed\")));\n      img.src = src;\n    });\n  };\n\n  constructor(options: DataTileSourceOptions & { url: string | Source }) {\n    super({\n      ...options,\n      ...{\n        state: \"loading\",\n      },\n    });\n\n    const p = new PMTiles(options.url);\n    p.getHeader().then((h: Header) => {\n      const projection =\n        options.projection === undefined ? \"EPSG:3857\" : options.projection;\n      this.tileGrid =\n        options.tileGrid ||\n        createXYZ({\n          extent: extentFromProjection(projection),\n          maxResolution: options.maxResolution,\n          minZoom: h.minZoom,\n          maxZoom: h.maxZoom,\n          tileSize: options.tileSize,\n        });\n      this.setLoader(async (z, x, y): Promise<Data> => {\n        const response = await p.getZxy(z, x, y);\n        if (!response) {\n          return new Uint8Array();\n        }\n        const src = URL.createObjectURL(new Blob([response.data]));\n        const image = await this.loadImage(src);\n        URL.revokeObjectURL(src);\n        return image;\n      });\n      this.setState(\"ready\");\n    });\n  }\n}\n\nexport class PMTilesVectorSource extends VectorTileSource {\n  pmtiles_: PMTiles;\n\n  tileLoadFunction = (tile: Tile, url: string) => {\n    const vtile = tile as VectorTile;\n    // the URL construction is done internally by OL, so we need to parse it\n    // back out here using a hacky regex\n    const re = new RegExp(/pmtiles:\\/\\/(\\d+)\\/(\\d+)\\/(\\d+)/);\n    const result = url.match(re);\n\n    if (!(result && result.length >= 4)) {\n      throw Error(\"Could not parse tile URL\");\n    }\n    const z = +result[1];\n    const x = +result[2];\n    const y = +result[3];\n\n    vtile.setLoader(\n      (extent: Extent, resolution: number, projection: Projection) => {\n        this.pmtiles_\n          .getZxy(z, x, y)\n          .then((tile_result) => {\n            if (tile_result) {\n              const format = vtile.getFormat();\n              vtile.setFeatures(\n                format.readFeatures(tile_result.data, {\n                  extent: extent,\n                  featureProjection: projection,\n                }),\n              );\n              vtile.setState(TileState.LOADED);\n            } else {\n              vtile.setFeatures([]);\n              vtile.setState(TileState.EMPTY);\n            }\n          })\n          .catch((err) => {\n            vtile.setFeatures([]);\n            vtile.setState(TileState.ERROR);\n          });\n      },\n    );\n  };\n\n  constructor(\n    options: VectorTileSourceOptions<RenderFeature> & { url: string | Source },\n  ) {\n    super({\n      ...options,\n      ...{\n        state: \"loading\",\n        url: \"pmtiles://{z}/{x}/{y}\",\n        format: options.format || new MVT(),\n      },\n    });\n\n    this.pmtiles_ = new PMTiles(options.url);\n    this.pmtiles_.getHeader().then((h: Header) => {\n      const projection = options.projection || \"EPSG:3857\";\n      const extent = options.extent || extentFromProjection(projection);\n      this.tileGrid =\n        options.tileGrid ||\n        createXYZ({\n          extent: extent,\n          maxResolution: options.maxResolution,\n          maxZoom: options.maxZoom !== undefined ? options.maxZoom : h.maxZoom,\n          minZoom: h.minZoom,\n          tileSize: options.tileSize || 512,\n        });\n      this.setTileLoadFunction(this.tileLoadFunction);\n      this.setState(\"ready\");\n    });\n  }\n}\n"]}