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// Boost.Geometry (aka GGL, Generic Geometry Library)
// QuickBook Example
// Copyright (c) 2011-2012 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)
//[transform_with_strategy
//` Shows how points can be scaled, translated or rotated
#include <iostream>
#include <boost/geometry.hpp>
int main()
{
namespace trans = boost::geometry::strategy::transform;
using boost::geometry::dsv;
typedef boost::geometry::model::point<double, 2, boost::geometry::cs::cartesian> point_type;
point_type p1(1.0, 1.0);
// Translate over (1.5, 1.5)
point_type p2;
trans::translate_transformer<point_type, point_type> translate(1.5, 1.5);
boost::geometry::transform(p1, p2, translate);
// Scale with factor 3.0
point_type p3;
trans::scale_transformer<point_type, point_type> scale(3.0);
boost::geometry::transform(p1, p3, scale);
// Rotate with respect to the origin (0,0) over 90 degrees (clockwise)
point_type p4;
trans::rotate_transformer<point_type, point_type, boost::geometry::degree> rotate(90.0);
boost::geometry::transform(p1, p4, rotate);
std::cout
<< "p1: " << dsv(p1) << std::endl
<< "p2: " << dsv(p2) << std::endl
<< "p3: " << dsv(p3) << std::endl
<< "p4: " << dsv(p4) << std::endl;
return 0;
}
//]
//[transform_with_strategy_output
/*`
Output:
[pre
p1: (1, 1)
p2: (2.5, 2.5)
p3: (3, 3)
p4: (1, -1)
]
*/
//]
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