Doc update, mainly with respect to num_{geometries, points, interior_rings}

[SVN r68811]

doc/src/examples/algorithms/num_points.cpp

@@ -0,0 +1,47 @@
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+//
+// Copyright Barend Gehrels 2011, Geodan, Amsterdam, the Netherlands
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// Quickbook Example
+
+//[num_points
+//` Get the number of points in a geometry
+
+#include <iostream>
+
+#include <boost/geometry/geometry.hpp>
+#include <boost/geometry/multi/multi.hpp>
+#include <boost/geometry/geometries/geometries.hpp>
+#include <boost/geometry/multi/geometries/multi_polygon.hpp>
+#include <boost/geometry/extensions/gis/io/wkt/wkt.hpp>
+
+
+int main()
+{
+    boost::geometry::model::multi_polygon
+        <
+            boost::geometry::model::polygon
+                <
+                    boost::geometry::model::d2::point_xy<double>
+                >
+        > mp;
+    boost::geometry::read_wkt("MULTIPOLYGON(((0 0,0 10,10 0,0 0),(1 1,1 9,9 1,1 1)),((10 10,10 7,7 10,10 10)))", mp);
+    std::cout << "Number of points: " << boost::geometry::num_points(mp) << std::endl;
+
+    return 0;
+}
+
+//]
+
+
+//[num_points_output
+/*`
+Output:
+[pre
+ Number of points: 12
+]
+*/
+//]