[WIP] [Feature] Plotly extension

extensions/example/io/Jamfile

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+# Boost.Geometry (aka GGL, Generic Geometry Library)
+#
+# Copyright (c) 2020 Baidyanath Kundu, Haldia, India.
+
+# 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)
+
+project boost-geometry-extensions-io
+    : #requirements
+    ;
+
+exe plotly_example : plotly_example.cpp ;

extensions/example/io/plotly_example.cpp

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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+// QuickBook Example
+
+// Copyright (c) 2013 Barend Gehrels, 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)
+
+#include <iostream>
+#include <fstream>
+#include <boost/geometry.hpp>
+#include <boost/geometry/extensions/io/plotly/plotter.hpp>
+#include <boost/geometry/geometries/point_xy.hpp>
+
+namespace bg = boost::geometry;
+
+int main()
+{
+    typedef bg::model::point<double, 2, bg::cs::geographic<bg::degree>> point_t;
+    typedef bg::model::polygon<point_t> polygon_t;
+
+    polygon_t poly1;
+
+    bg::append(poly1.outer(), point_t(0.0, 0.0));
+    bg::append(poly1.outer(), point_t(0.0, 5.0));
+    bg::append(poly1.outer(), point_t(5.0, 5.0));
+    bg::append(poly1.outer(), point_t(5.0, 0.0));
+    bg::append(poly1.outer(), point_t(0.0, 0.0));
+
+    poly1.inners().resize(1);
+    bg::append(poly1.inners()[0], point_t(1.0, 1.0));
+    bg::append(poly1.inners()[0], point_t(4.0, 1.0));
+    bg::append(poly1.inners()[0], point_t(4.0, 4.0));
+    bg::append(poly1.inners()[0], point_t(1.0, 4.0));
+    bg::append(poly1.inners()[0], point_t(1.0, 1.0));
+
+    bg::plotly_plotter<std::ofstream> plotter("my_plot.json");
+    plotter.plot(poly1, bg::plotly_color(255, 39, 0));
+
+    return 0;
+}