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55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// QuickBook Example
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// Copyright (c) 2011 Barend Gehrels, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//[transform
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//` Shows how points can be transformed using the default strategy
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#include <iostream>
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#include <boost/geometry.hpp>
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int main()
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{
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namespace bg = boost::geometry;
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// Select a point near the pole (theta=5.0, phi=15.0)
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bg::model::point<long double, 2, bg::cs::spherical<bg::degree> > p1(15.0, 5.0);
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// Transform from degree to radian. Default strategy is automatically selected,
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// it will convert from degree to radian
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bg::model::point<long double, 2, bg::cs::spherical<bg::radian> > p2;
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bg::transform(p1, p2);
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// Transform from degree (lon-lat) to 3D (x,y,z). Default strategy is automatically selected,
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// it will consider points on a unit sphere
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bg::model::point<long double, 3, bg::cs::cartesian> p3;
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bg::transform(p1, p3);
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std::cout
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<< "p1: " << bg::dsv(p1) << std::endl
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<< "p2: " << bg::dsv(p2) << std::endl
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<< "p3: " << bg::dsv(p3) << std::endl;
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return 0;
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}
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//]
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//[transform_output
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/*`
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Output:
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[pre
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p1: (15, 5)
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p2: (0.261799, 0.0872665)
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p3: (0.084186, 0.0225576, 0.996195)
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]
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*/
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//]
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