geojson-vt - npm Package Compare versions

Comparing version 2.1.2 to 2.1.3

package.json

 {
   "name": "geojson-vt",
-  "version": "2.1.2",
+  "version": "2.1.3",
   "description": "Slice GeoJSON data into vector tiles efficiently",
@@ -5,0 +5,0 @@ "homepage": "https://github.com/mapbox/geojson-vt",

README.md

@@ -60,2 +60,3 @@ ## geojson-vt — GeoJSON Vector Tiles
 	indexMaxPoints: 100000, // max number of points per tile in the index
+	solidChildren: false    // whether to include solid tile children in the index
 });
@@ -74,2 +75,7 @@ ```
 
+##### 2.1.3 (Aug 14, 2015)
+
+- Added `solidChildren` option that includes children of solid filled square tiles in the index (off by default).
+- Added back solid tile heuristics (not tiling solid filled square tiles further).
+
 ##### 2.1.2 (Aug 13, 2015)
@@ -76,0 +82,0 @@

src/index.js

@@ -51,2 +51,3 @@ 'use strict';
     indexMaxPoints: 100000, // max number of points per tile in the tile index
+    solidChildren: false,   // whether to tile solid square tiles further
     tolerance: 3,           // simplification tolerance (higher means simpler)
@@ -64,3 +65,4 @@ extent: 4096,           // tile extent
         extent = options.extent,
-        buffer = options.buffer;
+        buffer = options.buffer,
+        solidChildren = options.solidChildren;
 
@@ -99,2 +101,5 @@ // avoid recursion by using a processing queue
 
+        // stop tiling if the tile is solid clipped square
+        if (!solidChildren && isClippedSquare(tile, extent, buffer)) continue;
+
         // if it's the first-pass tiling
@@ -180,2 +185,4 @@ if (!cz) {
     if (parent.source) {
+        if (isClippedSquare(parent, extent, options.buffer)) return transformTile(parent, extent);
+
         if (debug > 1) console.time('drilling down');
@@ -239,1 +246,22 @@ this.splitTile(parent.source, z0, x0, y0, z, x, y);
 }
+
+// checks whether a tile is a whole-area fill after clipping; if it is, there's no sense slicing it further
+function isClippedSquare(tile, extent, buffer) {
+
+    var features = tile.source;
+    if (features.length !== 1) return false;
+
+    var feature = features[0];
+    if (feature.type !== 3 || feature.geometry.length > 1) return false;
+
+    var len = feature.geometry[0].length;
+    if (len !== 5) return false;
+
+    for (var i = 0; i < len; i++) {
+        var p = transformPoint(feature.geometry[0][i], extent, tile.z2, tile.x, tile.y);
+        if ((p[0] !== -buffer && p[0] !== extent + buffer) ||
+            (p[1] !== -buffer && p[1] !== extent + buffer)) return false;
+    }
+
+    return true;
+}

No alert changes

Improved metrics

Total package byte prevSize

1803962

increased by0.08%

Lines of code

8087

increased by0.25%

Number of lines in readme file

112

increased by5.66%

No dependency changes