Add Zoomify stuff

src/ol/tilegrid/zoomifytilegrid.exports

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+@exportClass ol.tilegrid.Zoomify ol.tilegrid.ZoomifyOptions

src/ol/tilegrid/zoomifytilegrid.js

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+goog.provide('ol.tilegrid.Zoomify');
+
+goog.require('goog.math');
+goog.require('ol.TileCoord');
+goog.require('ol.proj');
+goog.require('ol.tilegrid.TileGrid');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.tilegrid.TileGrid}
+ * @param {ol.tilegrid.ZoomifyOptions} options Zoomify options.
+ * @todo stability experimental
+ */
+ol.tilegrid.Zoomify = function(options) {
+  goog.base(this, {
+    origin: [0, 0],
+    resolutions: options.resolutions
+  });
+
+};
+goog.inherits(ol.tilegrid.Zoomify, ol.tilegrid.TileGrid);
+
+
+/**
+ * @inheritDoc
+ */
+ol.tilegrid.Zoomify.prototype.createTileCoordTransform = function(opt_options) {
+  var options = goog.isDef(opt_options) ? opt_options : {};
+  var minZ = this.minZoom;
+  var maxZ = this.maxZoom;
+  var tmpTileCoord = new ol.TileCoord(0, 0, 0);
+  /** @type {Array.<ol.TileRange>} */
+  var tileRangeByZ = null;
+  if (goog.isDef(options.extent)) {
+    tileRangeByZ = new Array(maxZ + 1);
+    var z;
+    for (z = 0; z <= maxZ; ++z) {
+      if (z < minZ) {
+        tileRangeByZ[z] = null;
+      } else {
+        tileRangeByZ[z] = this.getTileRangeForExtentAndZ(options.extent, z);
+      }
+    }
+  }
+  return (
+      /**
+       * @param {ol.TileCoord} tileCoord Tile coordinate.
+       * @param {ol.proj.Projection} projection Projection.
+       * @param {ol.TileCoord=} opt_tileCoord Destination tile coordinate.
+       * @return {ol.TileCoord} Tile coordinate.
+       */
+      function(tileCoord, projection, opt_tileCoord) {
+        var z = tileCoord.z;
+        if (z < minZ || maxZ < z) {
+          return null;
+        }
+        var n = Math.pow(2, z);
+        var x = tileCoord.x;
+        if (x < 0 || n <= x) {
+          return null;
+        }
+        var y = tileCoord.y;
+        if (y < -n || -1 < y) {
+          return null;
+        }
+        if (!goog.isNull(tileRangeByZ)) {
+          tmpTileCoord.z = z;
+          tmpTileCoord.x = x;
+          tmpTileCoord.y = y;
+          if (!tileRangeByZ[z].contains(tmpTileCoord)) {
+            return null;
+          }
+        }
+        if (goog.isDef(opt_tileCoord)) {
+          opt_tileCoord.z = z;
+          opt_tileCoord.x = x;
+          opt_tileCoord.y = -y - 1;
+          return opt_tileCoord;
+        } else {
+          return new ol.TileCoord(z, x, -y - 1);
+        }
+      });
+};