Add ol.TileBounds

src/ol/tilebounds.js

@@ -0,0 +1,43 @@
+goog.provide('ol.TileBounds');
+
+goog.require('goog.asserts');
+goog.require('goog.math.Box');
+goog.require('ol.TileCoord');
+
+
+
+/**
+ * @constructor
+ * @extends {goog.math.Box}
+ * @param {number} top Top.
+ * @param {number} right Right.
+ * @param {number} bottom Bottom.
+ * @param {number} left Left.
+ */
+ol.TileBounds = function(top, right, bottom, left) {
+
+  goog.base(this, top, right, bottom, left);
+
+};
+goog.inherits(ol.TileBounds, goog.math.Box);
+
+
+/**
+ * @param {...ol.TileCoord} var_args Tile coordinates.
+ * @return {!ol.TileBounds} Bounding tile box.
+ */
+ol.TileBounds.boundingTileBounds = function(var_args) {
+  var tileCoord0 = arguments[0];
+  var tileBounds = new ol.TileBounds(tileCoord0.y, tileCoord0.x,
+                                     tileCoord0.y, tileCoord0.x);
+  var i;
+  for (i = 1; i < arguments.length; ++i) {
+    var tileCoord = arguments[i];
+    goog.asserts.assert(tileCoord.z == tileCoord0.z);
+    tileBounds.top = Math.min(tileBounds.top, tileCoord.y);
+    tileBounds.right = Math.max(tileBounds.right, tileCoord.x);
+    tileBounds.bottom = Math.max(tileBounds.bottom, tileCoord.y);
+    tileBounds.left = Math.min(tileBounds.left, tileCoord.x);
+  }
+  return tileBounds;
+};