Allow geometries to use a shared vertex array

The ol.geom.SharedVertices structure represents a flattened array of vertex coordinates. This is intended to support optimal WebGL rendering.
2013-03-02 18:39:24 +01:00
parent bdfa2cc88c
commit b52d283641
23 changed files with 1086 additions and 217 deletions
@@ -0,0 +1,79 @@
+goog.provide('ol.geom.AbstractCollection');
+
+goog.require('ol.Extent');
+goog.require('ol.geom.Geometry');
+
+
+
+/**
+ * A collection of geometries.  This constructor is not to be used directly.
+ *
+ * @constructor
+ * @extends {ol.geom.Geometry}
+ */
+ol.geom.AbstractCollection = function() {
+  goog.base(this);
+
+  /**
+   * @type {number}
+   */
+  this.dimension;
+
+  /**
+   * @type {Array.<ol.geom.Geometry>}
+   */
+  this.components = null;
+
+  /**
+   * @type {ol.Extent}
+   * @protected
+   */
+  this.bounds = null;
+
+};
+goog.inherits(ol.geom.AbstractCollection, ol.geom.Geometry);
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.AbstractCollection.prototype.getBounds = function() {
+  if (goog.isNull(this.bounds)) {
+    var minX,
+        minY = minX = Number.POSITIVE_INFINITY,
+        maxX,
+        maxY = maxX = Number.NEGATIVE_INFINITY,
+        components = this.components,
+        len = components.length,
+        bounds, i;
+
+    for (i = 0; i < len; ++i) {
+      bounds = components[i].getBounds();
+      minX = Math.min(bounds.minX, minX);
+      minY = Math.min(bounds.minY, minY);
+      maxX = Math.max(bounds.maxX, maxX);
+      maxY = Math.max(bounds.maxY, maxY);
+    }
+    this.bounds = new ol.Extent(minX, minY, maxX, maxY);
+  }
+  return this.bounds;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.AbstractCollection.prototype.getCoordinates = function() {
+  var count = this.components.length;
+  var coordinates = new Array(count);
+  for (var i = 0; i < count; ++i) {
+    coordinates[i] = this.components[i].getCoordinates();
+  }
+  return coordinates;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.geom.AbstractCollection.prototype.getType = goog.abstractMethod;