add addzone and update zone in map-adapter interface

node_modules/geojson-vt/src/transform.js

@@ -0,0 +1,41 @@
+
+// Transforms the coordinates of each feature in the given tile from
+// mercator-projected space into (extent x extent) tile space.
+export default function transformTile(tile, extent) {
+    if (tile.transformed) return tile;
+
+    const z2 = 1 << tile.z;
+    const tx = tile.x;
+    const ty = tile.y;
+
+    for (const feature of tile.features) {
+        const geom = feature.geometry;
+        const type = feature.type;
+
+        feature.geometry = [];
+
+        if (type === 1) {
+            for (let j = 0; j < geom.length; j += 2) {
+                feature.geometry.push(transformPoint(geom[j], geom[j + 1], extent, z2, tx, ty));
+            }
+        } else {
+            for (let j = 0; j < geom.length; j++) {
+                const ring = [];
+                for (let k = 0; k < geom[j].length; k += 2) {
+                    ring.push(transformPoint(geom[j][k], geom[j][k + 1], extent, z2, tx, ty));
+                }
+                feature.geometry.push(ring);
+            }
+        }
+    }
+
+    tile.transformed = true;
+
+    return tile;
+}
+
+function transformPoint(x, y, extent, z2, tx, ty) {
+    return [
+        Math.round(extent * (x * z2 - tx)),
+        Math.round(extent * (y * z2 - ty))];
+}