Move more functions into private methods
This commit is contained in:
Tom Payne
+379
-366
@@ -69,116 +69,139 @@ ol.structs.RTree = function(opt_maxWidth) {
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({extent: [0, 0, 0, 0], nodes: []});
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({extent: [0, 0, 0, 0], nodes: []});
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/**
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/**
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* Find the best specific node(s) for object to be deleted from.
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* Non-recursive search function
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*
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*
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* @param {ol.structs.RTreeNode} rect Rectangle.
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* @param {ol.Extent} extent Extent.
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* @param {Object} obj Object.
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* @param {string=} opt_type Optional type of the objects we want to find.
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* @param {ol.structs.RTreeNode} root Root to start search.
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* @return {Array} Result.
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* @return {Array} Leaf node parent.
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* @this {ol.structs.RTree}
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*/
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*/
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var removeSubtree = function(rect, obj, root) {
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this.search = function(extent, opt_type) {
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var hitStack = []; // Contains the elements that overlap
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var rect = /** @type {ol.structs.RTreeNode} */ ({extent: extent});
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var countStack = []; // Contains the elements that overlap
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return /** @type {Array} */ (that.searchSubtree_.apply(this,
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var returnArray = [];
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[rect, false, [], rootTree, opt_type]));
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var currentDepth = 1;
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if (!rect || !ol.extent.intersects(rect.extent, root.extent)) {
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return returnArray;
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}
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/** @type {ol.structs.RTreeNode} */
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var workingObject = /** @type {ol.structs.RTreeNode} */
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({extent: rect.extent.concat(), target: obj});
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countStack.push(root.nodes.length);
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hitStack.push(root);
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do {
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var tree = hitStack.pop();
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var i = countStack.pop() - 1;
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if (goog.isDef(workingObject.target)) {
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// We are searching for a target
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while (i >= 0) {
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var lTree = tree.nodes[i];
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if (ol.extent.intersects(workingObject.extent, lTree.extent)) {
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if ((workingObject.target && goog.isDef(lTree.leaf) &&
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lTree.leaf === workingObject.target) ||
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(!workingObject.target && (goog.isDef(lTree.leaf) ||
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ol.extent.containsExtent(workingObject.extent, lTree.extent))))
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{ // A Match !!
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// Yup we found a match...
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// we can cancel search and start walking up the list
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if (goog.isDef(lTree.nodes)) {
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// If we are deleting a node not a leaf...
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returnArray = searchSubtree(lTree, true, [], lTree);
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tree.nodes.splice(i, 1);
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} else {
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returnArray = tree.nodes.splice(i, 1);
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}
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// Resize MBR down...
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ol.structs.RTree.makeMBR_(tree.nodes, tree);
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workingObject.target = undefined;
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if (tree.nodes.length < that.minWidth_) { // Underflow
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workingObject.nodes = /** @type {Array} */
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(searchSubtree(tree, true, [], tree));
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}
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break;
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} else if (goog.isDef(lTree.nodes)) {
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// Not a Leaf
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currentDepth += 1;
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countStack.push(i);
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hitStack.push(tree);
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tree = lTree;
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i = lTree.nodes.length;
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}
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}
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i -= 1;
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}
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} else if (goog.isDef(workingObject.nodes)) {
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// We are unsplitting
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tree.nodes.splice(i + 1, 1); // Remove unsplit node
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// workingObject.nodes contains a list of elements removed from the
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// tree so far
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if (tree.nodes.length > 0) {
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ol.structs.RTree.makeMBR_(tree.nodes, tree);
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}
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for (var t = 0, tt = workingObject.nodes.length; t < tt; ++t) {
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insertSubtree(workingObject.nodes[t], tree);
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}
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workingObject.nodes.length = 0;
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if (hitStack.length === 0 && tree.nodes.length <= 1) {
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// Underflow..on root!
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workingObject.nodes = /** @type {Array} */
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(searchSubtree(tree, true, workingObject.nodes, tree));
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tree.nodes.length = 0;
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hitStack.push(tree);
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countStack.push(1);
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} else if (hitStack.length > 0 && tree.nodes.length < that.minWidth_) {
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// Underflow..AGAIN!
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workingObject.nodes = /** @type {Array} */
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(searchSubtree(tree, true, workingObject.nodes, tree));
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tree.nodes.length = 0;
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} else {
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workingObject.nodes = undefined; // Just start resizing
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}
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} else { // we are just resizing
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ol.structs.RTree.makeMBR_(tree.nodes, tree);
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}
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currentDepth -= 1;
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} while (hitStack.length > 0);
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return returnArray;
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};
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};
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/**
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* Non-recursive search function
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*
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* @param {ol.Extent} extent Extent.
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* @param {string=} opt_type Optional type of the objects we want to find.
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* @return {Object} Result. Keys are UIDs of the values.
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* @this {ol.structs.RTree}
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*/
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this.searchReturningObject = function(extent, opt_type) {
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var rect = /** @type {ol.structs.RTreeNode} */ ({extent: extent});
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return /** @type {Object} */ (that.searchSubtree_.apply(this,
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[rect, false, [], rootTree, opt_type, true]));
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};
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/**
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* Non-recursive function that deletes a specific region.
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*
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* @param {ol.Extent} extent Extent.
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* @param {Object=} opt_obj Object.
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* @return {Array} Result.
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* @this {ol.structs.RTree}
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*/
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this.remove = function(extent, opt_obj) {
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arguments[0] = /** @type {ol.structs.RTreeNode} */ ({extent: extent});
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switch (arguments.length) {
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case 1:
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arguments[1] = false; // opt_obj == false for conditionals
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case 2:
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arguments[2] = rootTree; // Add root node to end of argument list
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default:
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arguments.length = 3;
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}
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if (arguments[1] === false) { // Do area-wide †
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var numberDeleted = 0;
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var result = [];
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do {
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numberDeleted = result.length;
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result = result.concat(this.removeSubtree_.apply(this, arguments));
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} while (numberDeleted != result.length);
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return result;
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} else { // Delete a specific item
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return this.removeSubtree_.apply(this, arguments);
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}
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};
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/**
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* Non-recursive insert function.
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*
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* @param {ol.Extent} extent Extent.
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* @param {Object} obj Object to insert.
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* @param {string=} opt_type Optional type to store along with the object.
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*/
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this.insert = function(extent, obj, opt_type) {
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var node = /** @type {ol.structs.RTreeNode} */
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({extent: extent, leaf: obj});
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if (goog.isDef(opt_type)) {
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node.type = opt_type;
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}
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that.insertSubtree_(node, rootTree);
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};
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//End of RTree
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};
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/**
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* Generates a minimally bounding rectangle for all rectangles in
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* array "nodes". `rect` is modified into the MBR.
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*
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* @param {Array} nodes Nodes.
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* @param {ol.structs.RTreeNode} rect Rectangle.
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* @private
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* @return {ol.structs.RTreeNode} Rectangle.
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*/
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ol.structs.RTree.makeMBR_ = function(nodes, rect) {
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if (nodes.length < 1) {
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return {extent: [0, 0, 0, 0]};
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}
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rect.extent = nodes[0].extent.concat();
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for (var i = nodes.length - 1; i > 0; --i) {
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ol.extent.extend(rect.extent, nodes[i].extent);
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}
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return rect;
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};
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/**
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* This is Jon-Carlos Rivera's special addition to the world of r-trees.
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* Every other (simple) method he found produced poor trees.
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* This skews insertions to prefering squarer and emptier nodes.
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*
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* @param {number} l L.
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* @param {number} w W.
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* @param {number} fill Fill.
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* @private
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* @return {number} Squarified ratio.
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*/
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ol.structs.RTree.squarifiedRatio_ = function(l, w, fill) {
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// Area of new enlarged rectangle
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var peri = (l + w) / 2; // Average size of a side of the new rectangle
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var area = l * w; // Area of new rectangle
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// return the ratio of the perimeter to the area - the closer to 1 we are,
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// the more "square" a rectangle is. conversly, when approaching zero the
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// more elongated a rectangle is
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var geo = area / (peri * peri);
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return area * fill / geo;
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};
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/**
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/**
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* Choose the best damn node for rectangle to be inserted into.
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* Choose the best damn node for rectangle to be inserted into.
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*
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*
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* @param {ol.structs.RTreeNode} rect Rectangle.
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* @param {ol.structs.RTreeNode} rect Rectangle.
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* @param {ol.structs.RTreeNode} root Root to start search.
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* @param {ol.structs.RTreeNode} root Root to start search.
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* @private
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* @return {Array} Leaf node parent.
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* @return {Array} Leaf node parent.
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*/
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*/
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var chooseLeafSubtree = function(rect, root) {
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ol.structs.RTree.prototype.chooseLeafSubtree_ = function(rect, root) {
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var bestChoiceIndex = -1;
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var bestChoiceIndex = -1;
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var bestChoiceStack = [];
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var bestChoiceStack = [];
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var bestChoiceArea;
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var bestChoiceArea;
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@@ -231,92 +254,94 @@ ol.structs.RTree = function(opt_maxWidth) {
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return bestChoiceStack;
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return bestChoiceStack;
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};
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};
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/**
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* Split a set of nodes into two roughly equally-filled nodes.
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*
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* @param {Array.<ol.structs.RTreeNode>} nodes Array of nodes.
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* @return {Array.<Array.<ol.structs.RTreeNode>>} An array of two new arrays
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* of nodes.
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*/
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var linearSplit = function(nodes) {
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var n = pickLinear(nodes);
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while (nodes.length > 0) {
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pickNext(nodes, n[0], n[1]);
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}
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return n;
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};
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/**
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/**
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* Insert the best source rectangle into the best fitting parent node: a or b.
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* Non-recursive internal insert function.
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*
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*
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* @param {Array.<ol.structs.RTreeNode>} nodes Source node array.
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* @param {ol.structs.RTreeNode} node Node to insert.
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* @param {ol.structs.RTreeNode} a Target node array a.
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* @param {ol.structs.RTreeNode} root Root to begin insertion at.
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* @param {ol.structs.RTreeNode} b Target node array b.
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* @private
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*/
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*/
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var pickNext = function(nodes, a, b) {
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ol.structs.RTree.prototype.insertSubtree_ = function(node, root) {
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// Area of new enlarged rectangle
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var bc; // Best Current node
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var areaA = ol.structs.RTree.squarifiedRatio_(a.extent[1] - a.extent[0],
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// Initial insertion is special because we resize the Tree and we don't
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a.extent[3] - a.extent[2], a.nodes.length + 1);
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// care about any overflow (seriously, how can the first object overflow?)
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var areaB = ol.structs.RTree.squarifiedRatio_(b.extent[1] - b.extent[0],
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if (root.nodes.length === 0) {
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b.extent[3] - b.extent[2], b.nodes.length + 1);
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root.extent = node.extent.concat();
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var highAreaDelta;
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root.nodes.push(node);
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var highAreaNode;
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return;
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var lowestGrowthGroup;
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}
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for (var i = nodes.length - 1; i >= 0; --i) {
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// Find the best fitting leaf node
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var l = nodes[i];
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// chooseLeaf returns an array of all tree levels (including root)
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// that were traversed while trying to find the leaf
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var treeStack = this.chooseLeafSubtree_(node, root);
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var workingObject = node;
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var newAreaA = [
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// Walk back up the tree resizing and inserting as needed
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a.extent[0] < l.extent[0] ? a.extent[0] : l.extent[0],
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do {
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a.extent[1] > l.extent[1] ? a.extent[1] : l.extent[1],
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//handle the case of an empty node (from a split)
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a.extent[2] < l.extent[2] ? a.extent[2] : l.extent[2],
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if (bc && goog.isDef(bc.nodes) && bc.nodes.length === 0) {
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a.extent[3] > l.extent[3] ? a.extent[3] : l.extent[3]
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var pbc = bc; // Past bc
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];
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bc = treeStack.pop();
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var changeNewAreaA = Math.abs(ol.structs.RTree.squarifiedRatio_(
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for (var t = 0, tt = bc.nodes.length; t < tt; ++t) {
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newAreaA[1] - newAreaA[0],
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if (bc.nodes[t] === pbc || bc.nodes[t].nodes.length === 0) {
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newAreaA[3] - newAreaA[2], a.nodes.length + 2) - areaA);
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bc.nodes.splice(t, 1);
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break;
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var newAreaB = [
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b.extent[0] < l.extent[0] ? b.extent[0] : l.extent[0],
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b.extent[1] > l.extent[1] ? b.extent[1] : l.extent[1],
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b.extent[2] < l.extent[2] ? b.extent[2] : l.extent[2],
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b.extent[3] > l.extent[3] ? b.extent[3] : l.extent[3]
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];
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var changeNewAreaB = Math.abs(ol.structs.RTree.squarifiedRatio_(
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newAreaB[1] - newAreaB[0], newAreaB[3] - newAreaB[2],
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b.nodes.length + 2) - areaB);
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var changeNewAreaDelta = Math.abs(changeNewAreaB - changeNewAreaA);
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if (!highAreaNode || !highAreaDelta ||
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changeNewAreaDelta < highAreaDelta) {
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highAreaNode = i;
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highAreaDelta = changeNewAreaDelta;
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lowestGrowthGroup = changeNewAreaB < changeNewAreaA ? b : a;
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}
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}
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}
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}
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var tempNode = nodes.splice(highAreaNode, 1)[0];
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} else {
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if (a.nodes.length + nodes.length + 1 <= that.minWidth_) {
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bc = treeStack.pop();
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a.nodes.push(tempNode);
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ol.extent.extend(a.extent, tempNode.extent);
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} else if (b.nodes.length + nodes.length + 1 <= that.minWidth_) {
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b.nodes.push(tempNode);
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ol.extent.extend(b.extent, tempNode.extent);
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}
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}
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else {
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lowestGrowthGroup.nodes.push(tempNode);
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// If there is data attached to this workingObject
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ol.extent.extend(lowestGrowthGroup.extent, tempNode.extent);
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var isArray = goog.isArray(workingObject);
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if (goog.isDef(workingObject.leaf) ||
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goog.isDef(workingObject.nodes) || isArray) {
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// Do Insert
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if (isArray) {
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for (var ai = 0, aii = workingObject.length; ai < aii; ++ai) {
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ol.extent.extend(bc.extent, workingObject[ai].extent);
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}
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}
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bc.nodes = bc.nodes.concat(workingObject);
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} else {
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ol.extent.extend(bc.extent, workingObject.extent);
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bc.nodes.push(workingObject); // Do Insert
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}
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if (bc.nodes.length <= this.maxWidth_) { // Start Resizeing Up the Tree
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workingObject = {extent: bc.extent.concat()};
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} else { // Otherwise Split this Node
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// linearSplit_() returns an array containing two new nodes
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// formed from the split of the previous node's overflow
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||||||
|
var a = this.linearSplit_(bc.nodes);
|
||||||
|
workingObject = a;//[1];
|
||||||
|
|
||||||
|
if (treeStack.length < 1) { // If are splitting the root..
|
||||||
|
bc.nodes.push(a[0]);
|
||||||
|
treeStack.push(bc); // Reconsider the root element
|
||||||
|
workingObject = a[1];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
} else { // Otherwise Do Resize
|
||||||
|
//Just keep applying the new bounding rectangle to the parents..
|
||||||
|
ol.extent.extend(bc.extent, workingObject.extent);
|
||||||
|
workingObject = ({extent: bc.extent.concat()});
|
||||||
|
}
|
||||||
|
} while (treeStack.length > 0);
|
||||||
};
|
};
|
||||||
|
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* Pick the "best" two starter nodes to use as seeds using the "linear"
|
* Pick the "best" two starter nodes to use as seeds using the "linear"
|
||||||
* criteria.
|
* criteria.
|
||||||
*
|
*
|
||||||
* @param {Array.<ol.structs.RTreeNode>} nodes Array of source nodes.
|
* @param {Array.<ol.structs.RTreeNode>} nodes Array of source nodes.
|
||||||
|
* @private
|
||||||
* @return {Array.<ol.structs.RTreeNode>} An array of two new arrays
|
* @return {Array.<ol.structs.RTreeNode>} An array of two new arrays
|
||||||
* of nodes.
|
* of nodes.
|
||||||
*/
|
*/
|
||||||
var pickLinear = function(nodes) {
|
ol.structs.RTree.prototype.pickLinear_ = function(nodes) {
|
||||||
var lowestHighX = nodes.length - 1;
|
var lowestHighX = nodes.length - 1;
|
||||||
var highestLowX = 0;
|
var highestLowX = 0;
|
||||||
var lowestHighY = nodes.length - 1;
|
var lowestHighY = nodes.length - 1;
|
||||||
@@ -366,6 +391,192 @@ ol.structs.RTree = function(opt_maxWidth) {
|
|||||||
};
|
};
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Insert the best source rectangle into the best fitting parent node: a or b.
|
||||||
|
*
|
||||||
|
* @param {Array.<ol.structs.RTreeNode>} nodes Source node array.
|
||||||
|
* @param {ol.structs.RTreeNode} a Target node array a.
|
||||||
|
* @param {ol.structs.RTreeNode} b Target node array b.
|
||||||
|
* @private
|
||||||
|
*/
|
||||||
|
ol.structs.RTree.prototype.pickNext_ = function(nodes, a, b) {
|
||||||
|
// Area of new enlarged rectangle
|
||||||
|
var areaA = ol.structs.RTree.squarifiedRatio_(a.extent[1] - a.extent[0],
|
||||||
|
a.extent[3] - a.extent[2], a.nodes.length + 1);
|
||||||
|
var areaB = ol.structs.RTree.squarifiedRatio_(b.extent[1] - b.extent[0],
|
||||||
|
b.extent[3] - b.extent[2], b.nodes.length + 1);
|
||||||
|
var highAreaDelta;
|
||||||
|
var highAreaNode;
|
||||||
|
var lowestGrowthGroup;
|
||||||
|
|
||||||
|
for (var i = nodes.length - 1; i >= 0; --i) {
|
||||||
|
var l = nodes[i];
|
||||||
|
|
||||||
|
var newAreaA = [
|
||||||
|
a.extent[0] < l.extent[0] ? a.extent[0] : l.extent[0],
|
||||||
|
a.extent[1] > l.extent[1] ? a.extent[1] : l.extent[1],
|
||||||
|
a.extent[2] < l.extent[2] ? a.extent[2] : l.extent[2],
|
||||||
|
a.extent[3] > l.extent[3] ? a.extent[3] : l.extent[3]
|
||||||
|
];
|
||||||
|
var changeNewAreaA = Math.abs(ol.structs.RTree.squarifiedRatio_(
|
||||||
|
newAreaA[1] - newAreaA[0],
|
||||||
|
newAreaA[3] - newAreaA[2], a.nodes.length + 2) - areaA);
|
||||||
|
|
||||||
|
var newAreaB = [
|
||||||
|
b.extent[0] < l.extent[0] ? b.extent[0] : l.extent[0],
|
||||||
|
b.extent[1] > l.extent[1] ? b.extent[1] : l.extent[1],
|
||||||
|
b.extent[2] < l.extent[2] ? b.extent[2] : l.extent[2],
|
||||||
|
b.extent[3] > l.extent[3] ? b.extent[3] : l.extent[3]
|
||||||
|
];
|
||||||
|
var changeNewAreaB = Math.abs(ol.structs.RTree.squarifiedRatio_(
|
||||||
|
newAreaB[1] - newAreaB[0], newAreaB[3] - newAreaB[2],
|
||||||
|
b.nodes.length + 2) - areaB);
|
||||||
|
|
||||||
|
var changeNewAreaDelta = Math.abs(changeNewAreaB - changeNewAreaA);
|
||||||
|
if (!highAreaNode || !highAreaDelta ||
|
||||||
|
changeNewAreaDelta < highAreaDelta) {
|
||||||
|
highAreaNode = i;
|
||||||
|
highAreaDelta = changeNewAreaDelta;
|
||||||
|
lowestGrowthGroup = changeNewAreaB < changeNewAreaA ? b : a;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
var tempNode = nodes.splice(highAreaNode, 1)[0];
|
||||||
|
if (a.nodes.length + nodes.length + 1 <= this.minWidth_) {
|
||||||
|
a.nodes.push(tempNode);
|
||||||
|
ol.extent.extend(a.extent, tempNode.extent);
|
||||||
|
} else if (b.nodes.length + nodes.length + 1 <= this.minWidth_) {
|
||||||
|
b.nodes.push(tempNode);
|
||||||
|
ol.extent.extend(b.extent, tempNode.extent);
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
lowestGrowthGroup.nodes.push(tempNode);
|
||||||
|
ol.extent.extend(lowestGrowthGroup.extent, tempNode.extent);
|
||||||
|
}
|
||||||
|
};
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Find the best specific node(s) for object to be deleted from.
|
||||||
|
*
|
||||||
|
* @param {ol.structs.RTreeNode} rect Rectangle.
|
||||||
|
* @param {Object} obj Object.
|
||||||
|
* @param {ol.structs.RTreeNode} root Root to start search.
|
||||||
|
* @private
|
||||||
|
* @return {Array} Leaf node parent.
|
||||||
|
*/
|
||||||
|
ol.structs.RTree.prototype.removeSubtree_ = function(rect, obj, root) {
|
||||||
|
var hitStack = []; // Contains the elements that overlap
|
||||||
|
var countStack = []; // Contains the elements that overlap
|
||||||
|
var returnArray = [];
|
||||||
|
var currentDepth = 1;
|
||||||
|
|
||||||
|
if (!rect || !ol.extent.intersects(rect.extent, root.extent)) {
|
||||||
|
return returnArray;
|
||||||
|
}
|
||||||
|
|
||||||
|
/** @type {ol.structs.RTreeNode} */
|
||||||
|
var workingObject = /** @type {ol.structs.RTreeNode} */
|
||||||
|
({extent: rect.extent.concat(), target: obj});
|
||||||
|
|
||||||
|
countStack.push(root.nodes.length);
|
||||||
|
hitStack.push(root);
|
||||||
|
|
||||||
|
do {
|
||||||
|
var tree = hitStack.pop();
|
||||||
|
var i = countStack.pop() - 1;
|
||||||
|
|
||||||
|
if (goog.isDef(workingObject.target)) {
|
||||||
|
// We are searching for a target
|
||||||
|
while (i >= 0) {
|
||||||
|
var lTree = tree.nodes[i];
|
||||||
|
if (ol.extent.intersects(workingObject.extent, lTree.extent)) {
|
||||||
|
if ((workingObject.target && goog.isDef(lTree.leaf) &&
|
||||||
|
lTree.leaf === workingObject.target) ||
|
||||||
|
(!workingObject.target && (goog.isDef(lTree.leaf) ||
|
||||||
|
ol.extent.containsExtent(workingObject.extent, lTree.extent))))
|
||||||
|
{ // A Match !!
|
||||||
|
// Yup we found a match...
|
||||||
|
// we can cancel search and start walking up the list
|
||||||
|
if (goog.isDef(lTree.nodes)) {
|
||||||
|
// If we are deleting a node not a leaf...
|
||||||
|
returnArray = this.searchSubtree_(lTree, true, [], lTree);
|
||||||
|
tree.nodes.splice(i, 1);
|
||||||
|
} else {
|
||||||
|
returnArray = tree.nodes.splice(i, 1);
|
||||||
|
}
|
||||||
|
// Resize MBR down...
|
||||||
|
ol.structs.RTree.makeMBR_(tree.nodes, tree);
|
||||||
|
workingObject.target = undefined;
|
||||||
|
if (tree.nodes.length < this.minWidth_) { // Underflow
|
||||||
|
workingObject.nodes = /** @type {Array} */
|
||||||
|
(this.searchSubtree_(tree, true, [], tree));
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
} else if (goog.isDef(lTree.nodes)) {
|
||||||
|
// Not a Leaf
|
||||||
|
currentDepth += 1;
|
||||||
|
countStack.push(i);
|
||||||
|
hitStack.push(tree);
|
||||||
|
tree = lTree;
|
||||||
|
i = lTree.nodes.length;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
i -= 1;
|
||||||
|
}
|
||||||
|
} else if (goog.isDef(workingObject.nodes)) {
|
||||||
|
// We are unsplitting
|
||||||
|
tree.nodes.splice(i + 1, 1); // Remove unsplit node
|
||||||
|
// workingObject.nodes contains a list of elements removed from the
|
||||||
|
// tree so far
|
||||||
|
if (tree.nodes.length > 0) {
|
||||||
|
ol.structs.RTree.makeMBR_(tree.nodes, tree);
|
||||||
|
}
|
||||||
|
for (var t = 0, tt = workingObject.nodes.length; t < tt; ++t) {
|
||||||
|
this.insertSubtree_(workingObject.nodes[t], tree);
|
||||||
|
}
|
||||||
|
workingObject.nodes.length = 0;
|
||||||
|
if (hitStack.length === 0 && tree.nodes.length <= 1) {
|
||||||
|
// Underflow..on root!
|
||||||
|
workingObject.nodes = /** @type {Array} */
|
||||||
|
(this.searchSubtree_(tree, true, workingObject.nodes, tree));
|
||||||
|
tree.nodes.length = 0;
|
||||||
|
hitStack.push(tree);
|
||||||
|
countStack.push(1);
|
||||||
|
} else if (hitStack.length > 0 && tree.nodes.length < this.minWidth_) {
|
||||||
|
// Underflow..AGAIN!
|
||||||
|
workingObject.nodes = /** @type {Array} */
|
||||||
|
(this.searchSubtree_(tree, true, workingObject.nodes, tree));
|
||||||
|
tree.nodes.length = 0;
|
||||||
|
} else {
|
||||||
|
workingObject.nodes = undefined; // Just start resizing
|
||||||
|
}
|
||||||
|
} else { // we are just resizing
|
||||||
|
ol.structs.RTree.makeMBR_(tree.nodes, tree);
|
||||||
|
}
|
||||||
|
currentDepth -= 1;
|
||||||
|
} while (hitStack.length > 0);
|
||||||
|
|
||||||
|
return returnArray;
|
||||||
|
};
|
||||||
|
|
||||||
|
|
||||||
|
/**
|
||||||
|
* Split a set of nodes into two roughly equally-filled nodes.
|
||||||
|
*
|
||||||
|
* @param {Array.<ol.structs.RTreeNode>} nodes Array of nodes.
|
||||||
|
* @private
|
||||||
|
* @return {Array.<Array.<ol.structs.RTreeNode>>} An array of two new arrays
|
||||||
|
* of nodes.
|
||||||
|
*/
|
||||||
|
ol.structs.RTree.prototype.linearSplit_ = function(nodes) {
|
||||||
|
var n = this.pickLinear_(nodes);
|
||||||
|
while (nodes.length > 0) {
|
||||||
|
this.pickNext_(nodes, n[0], n[1]);
|
||||||
|
}
|
||||||
|
return n;
|
||||||
|
};
|
||||||
|
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* Non-recursive internal search function
|
* Non-recursive internal search function
|
||||||
*
|
*
|
||||||
@@ -376,10 +587,11 @@ ol.structs.RTree = function(opt_maxWidth) {
|
|||||||
* @param {string=} opt_type Optional type to search for.
|
* @param {string=} opt_type Optional type to search for.
|
||||||
* @param {boolean=} opt_resultAsObject If set, result will be an object keyed
|
* @param {boolean=} opt_resultAsObject If set, result will be an object keyed
|
||||||
* by UID.
|
* by UID.
|
||||||
|
* @private
|
||||||
* @return {Array|Object} Result.
|
* @return {Array|Object} Result.
|
||||||
*/
|
*/
|
||||||
var searchSubtree = function(rect, returnNode, result, root, opt_type,
|
ol.structs.RTree.prototype.searchSubtree_ = function(
|
||||||
opt_resultAsObject) {
|
rect, returnNode, result, root, opt_type, opt_resultAsObject) {
|
||||||
var resultObject = {};
|
var resultObject = {};
|
||||||
var hitStack = []; // Contains the elements that overlap
|
var hitStack = []; // Contains the elements that overlap
|
||||||
|
|
||||||
@@ -423,202 +635,3 @@ ol.structs.RTree = function(opt_maxWidth) {
|
|||||||
return result;
|
return result;
|
||||||
}
|
}
|
||||||
};
|
};
|
||||||
|
|
||||||
/**
|
|
||||||
* Non-recursive internal insert function.
|
|
||||||
*
|
|
||||||
* @param {ol.structs.RTreeNode} node Node to insert.
|
|
||||||
* @param {ol.structs.RTreeNode} root Root to begin insertion at.
|
|
||||||
*/
|
|
||||||
var insertSubtree = function(node, root) {
|
|
||||||
var bc; // Best Current node
|
|
||||||
// Initial insertion is special because we resize the Tree and we don't
|
|
||||||
// care about any overflow (seriously, how can the first object overflow?)
|
|
||||||
if (root.nodes.length === 0) {
|
|
||||||
root.extent = node.extent.concat();
|
|
||||||
root.nodes.push(node);
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
|
|
||||||
// Find the best fitting leaf node
|
|
||||||
// chooseLeaf returns an array of all tree levels (including root)
|
|
||||||
// that were traversed while trying to find the leaf
|
|
||||||
var treeStack = chooseLeafSubtree(node, root);
|
|
||||||
var workingObject = node;
|
|
||||||
|
|
||||||
// Walk back up the tree resizing and inserting as needed
|
|
||||||
do {
|
|
||||||
//handle the case of an empty node (from a split)
|
|
||||||
if (bc && goog.isDef(bc.nodes) && bc.nodes.length === 0) {
|
|
||||||
var pbc = bc; // Past bc
|
|
||||||
bc = treeStack.pop();
|
|
||||||
for (var t = 0, tt = bc.nodes.length; t < tt; ++t) {
|
|
||||||
if (bc.nodes[t] === pbc || bc.nodes[t].nodes.length === 0) {
|
|
||||||
bc.nodes.splice(t, 1);
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
} else {
|
|
||||||
bc = treeStack.pop();
|
|
||||||
}
|
|
||||||
|
|
||||||
// If there is data attached to this workingObject
|
|
||||||
var isArray = goog.isArray(workingObject);
|
|
||||||
if (goog.isDef(workingObject.leaf) ||
|
|
||||||
goog.isDef(workingObject.nodes) || isArray) {
|
|
||||||
// Do Insert
|
|
||||||
if (isArray) {
|
|
||||||
for (var ai = 0, aii = workingObject.length; ai < aii; ++ai) {
|
|
||||||
ol.extent.extend(bc.extent, workingObject[ai].extent);
|
|
||||||
}
|
|
||||||
bc.nodes = bc.nodes.concat(workingObject);
|
|
||||||
} else {
|
|
||||||
ol.extent.extend(bc.extent, workingObject.extent);
|
|
||||||
bc.nodes.push(workingObject); // Do Insert
|
|
||||||
}
|
|
||||||
|
|
||||||
if (bc.nodes.length <= that.maxWidth_) { // Start Resizeing Up the Tree
|
|
||||||
workingObject = {extent: bc.extent.concat()};
|
|
||||||
} else { // Otherwise Split this Node
|
|
||||||
// linearSplit() returns an array containing two new nodes
|
|
||||||
// formed from the split of the previous node's overflow
|
|
||||||
var a = linearSplit(bc.nodes);
|
|
||||||
workingObject = a;//[1];
|
|
||||||
|
|
||||||
if (treeStack.length < 1) { // If are splitting the root..
|
|
||||||
bc.nodes.push(a[0]);
|
|
||||||
treeStack.push(bc); // Reconsider the root element
|
|
||||||
workingObject = a[1];
|
|
||||||
}
|
|
||||||
}
|
|
||||||
} else { // Otherwise Do Resize
|
|
||||||
//Just keep applying the new bounding rectangle to the parents..
|
|
||||||
ol.extent.extend(bc.extent, workingObject.extent);
|
|
||||||
workingObject = ({extent: bc.extent.concat()});
|
|
||||||
}
|
|
||||||
} while (treeStack.length > 0);
|
|
||||||
};
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Non-recursive search function
|
|
||||||
*
|
|
||||||
* @param {ol.Extent} extent Extent.
|
|
||||||
* @param {string=} opt_type Optional type of the objects we want to find.
|
|
||||||
* @return {Array} Result.
|
|
||||||
* @this {ol.structs.RTree}
|
|
||||||
*/
|
|
||||||
this.search = function(extent, opt_type) {
|
|
||||||
var rect = /** @type {ol.structs.RTreeNode} */ ({extent: extent});
|
|
||||||
return /** @type {Array} */ (searchSubtree.apply(this, [rect, false, [],
|
|
||||||
rootTree, opt_type]));
|
|
||||||
};
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Non-recursive search function
|
|
||||||
*
|
|
||||||
* @param {ol.Extent} extent Extent.
|
|
||||||
* @param {string=} opt_type Optional type of the objects we want to find.
|
|
||||||
* @return {Object} Result. Keys are UIDs of the values.
|
|
||||||
* @this {ol.structs.RTree}
|
|
||||||
*/
|
|
||||||
this.searchReturningObject = function(extent, opt_type) {
|
|
||||||
var rect = /** @type {ol.structs.RTreeNode} */ ({extent: extent});
|
|
||||||
return /** @type {Object} */ (searchSubtree.apply(this, [rect, false, [],
|
|
||||||
rootTree, opt_type, true]));
|
|
||||||
};
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Non-recursive function that deletes a specific region.
|
|
||||||
*
|
|
||||||
* @param {ol.Extent} extent Extent.
|
|
||||||
* @param {Object=} opt_obj Object.
|
|
||||||
* @return {Array} Result.
|
|
||||||
* @this {ol.structs.RTree}
|
|
||||||
*/
|
|
||||||
this.remove = function(extent, opt_obj) {
|
|
||||||
arguments[0] = /** @type {ol.structs.RTreeNode} */ ({extent: extent});
|
|
||||||
switch (arguments.length) {
|
|
||||||
case 1:
|
|
||||||
arguments[1] = false; // opt_obj == false for conditionals
|
|
||||||
case 2:
|
|
||||||
arguments[2] = rootTree; // Add root node to end of argument list
|
|
||||||
default:
|
|
||||||
arguments.length = 3;
|
|
||||||
}
|
|
||||||
if (arguments[1] === false) { // Do area-wide †
|
|
||||||
var numberDeleted = 0;
|
|
||||||
var result = [];
|
|
||||||
do {
|
|
||||||
numberDeleted = result.length;
|
|
||||||
result = result.concat(removeSubtree.apply(this, arguments));
|
|
||||||
} while (numberDeleted != result.length);
|
|
||||||
return result;
|
|
||||||
} else { // Delete a specific item
|
|
||||||
return removeSubtree.apply(this, arguments);
|
|
||||||
}
|
|
||||||
};
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Non-recursive insert function.
|
|
||||||
*
|
|
||||||
* @param {ol.Extent} extent Extent.
|
|
||||||
* @param {Object} obj Object to insert.
|
|
||||||
* @param {string=} opt_type Optional type to store along with the object.
|
|
||||||
*/
|
|
||||||
this.insert = function(extent, obj, opt_type) {
|
|
||||||
var node = /** @type {ol.structs.RTreeNode} */
|
|
||||||
({extent: extent, leaf: obj});
|
|
||||||
if (goog.isDef(opt_type)) {
|
|
||||||
node.type = opt_type;
|
|
||||||
}
|
|
||||||
insertSubtree(node, rootTree);
|
|
||||||
};
|
|
||||||
|
|
||||||
//End of RTree
|
|
||||||
};
|
|
||||||
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Generates a minimally bounding rectangle for all rectangles in
|
|
||||||
* array "nodes". `rect` is modified into the MBR.
|
|
||||||
*
|
|
||||||
* @param {Array} nodes Nodes.
|
|
||||||
* @param {ol.structs.RTreeNode} rect Rectangle.
|
|
||||||
* @private
|
|
||||||
* @return {ol.structs.RTreeNode} Rectangle.
|
|
||||||
*/
|
|
||||||
ol.structs.RTree.makeMBR_ = function(nodes, rect) {
|
|
||||||
if (nodes.length < 1) {
|
|
||||||
return {extent: [0, 0, 0, 0]};
|
|
||||||
}
|
|
||||||
rect.extent = nodes[0].extent.concat();
|
|
||||||
|
|
||||||
for (var i = nodes.length - 1; i > 0; --i) {
|
|
||||||
ol.extent.extend(rect.extent, nodes[i].extent);
|
|
||||||
}
|
|
||||||
|
|
||||||
return rect;
|
|
||||||
};
|
|
||||||
|
|
||||||
|
|
||||||
/**
|
|
||||||
* This is Jon-Carlos Rivera's special addition to the world of r-trees.
|
|
||||||
* Every other (simple) method he found produced poor trees.
|
|
||||||
* This skews insertions to prefering squarer and emptier nodes.
|
|
||||||
*
|
|
||||||
* @param {number} l L.
|
|
||||||
* @param {number} w W.
|
|
||||||
* @param {number} fill Fill.
|
|
||||||
* @private
|
|
||||||
* @return {number} Squarified ratio.
|
|
||||||
*/
|
|
||||||
ol.structs.RTree.squarifiedRatio_ = function(l, w, fill) {
|
|
||||||
// Area of new enlarged rectangle
|
|
||||||
var peri = (l + w) / 2; // Average size of a side of the new rectangle
|
|
||||||
var area = l * w; // Area of new rectangle
|
|
||||||
// return the ratio of the perimeter to the area - the closer to 1 we are,
|
|
||||||
// the more "square" a rectangle is. conversly, when approaching zero the
|
|
||||||
// more elongated a rectangle is
|
|
||||||
var geo = area / (peri * peri);
|
|
||||||
return area * fill / geo;
|
|
||||||
};
|
|
||||||
|
|||||||
Reference in New Issue
Block a user