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README.md

@@ -82,7 +82,31 @@ function geometryToCells(geometry: GeoJSONGeometry, resolution: bigint): bigint
 ## cellToBoundary
 
 ```javascript
-function cellToBoundary(quadbin: bigint): GeoJSONGeometry 
+function cellToBoundary(quadbin: bigint): Polygon 
 ```
 
 Converts a Quadbin cell identifier into a geographical boundary represented as a polygon
+
+## quadbinToOffset
+
+```javascript
+function quadbinToOffset(quadbin: bigint): [number, number, number]
+```
+
+Converts a Quadbin cell identifier into world coordinates offset values
+
+## quadbinToWorldBounds
+
+```javascript
+function quadbinToWorldBounds(quadbin: bigint, coverage: number): [number[], number[]]
+```
+
+Computes the world bounds (in Web Mercator coordinates) for a given Quadbin cell, taking into account the cell's coverage area
+
+## getQuadbinPolygon
+
+```javascript
+function getQuadbinPolygon(quadbin: bigint, coverage = 1): number[]
+```
+
+Generates the geographical polygon (in longitude and latitude) that represents the boundaries of a Quadbin cell, optionally taking into account coverage

src/index.ts

@@ -17,21 +17,21 @@ type Tile = {x: number; y: number; z: number};
 
 const TILE_SIZE = 512;
 
-function quadbinToOffset(quadbin: bigint): [number, number, number] {
+export function quadbinToOffset(quadbin: bigint): [number, number, number] {
   const {x, y, z} = cellToTile(quadbin);
   const scale = TILE_SIZE / (1 << z);
   return [x * scale, TILE_SIZE - y * scale, scale];
 }
 
-function quadbinToWorldBounds(quadbin: bigint, coverage: number): [number[], number[]] {
+export function quadbinToWorldBounds(quadbin: bigint, coverage: number): [number[], number[]] {
   const [xOffset, yOffset, scale] = quadbinToOffset(quadbin);
   return [
     [xOffset, yOffset],
     [xOffset + coverage * scale, yOffset - coverage * scale]
   ];
 }
 
-function getQuadbinPolygon(quadbin: bigint, coverage = 1): number[] {
+export function getQuadbinPolygon(quadbin: bigint, coverage = 1): number[] {
   const [topLeft, bottomRight] = quadbinToWorldBounds(quadbin, coverage);
   const [w, n] = worldToLngLat(topLeft);
   const [e, s] = worldToLngLat(bottomRight);