mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-30 17:14:22 +03:00
104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
|
|
|
|
// Copyright (c) 2012-2014 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)
|
|
|
|
#ifndef BOOST_GEOMETRY_STRATEGIES_CARTESIAN_BUFFER_HPP
|
|
#define BOOST_GEOMETRY_STRATEGIES_CARTESIAN_BUFFER_HPP
|
|
|
|
namespace boost { namespace geometry
|
|
{
|
|
|
|
namespace strategy { namespace buffer
|
|
{
|
|
|
|
/*
|
|
|
|
A Buffer-join strategy gets 4 input points.
|
|
On the two consecutive segments s1 and s2 (joining at vertex v):
|
|
|
|
The lines from parallel at s1, s2 (at buffer-distance) end/start
|
|
in two points perpendicular to the segments: p1 and p2.
|
|
These parallel lines interesct in point ip
|
|
|
|
(s2)
|
|
|
|
|
|
|
|
^
|
|
|
|
|
(p2) |(v)
|
|
* +----<--- (s1)
|
|
|
|
x(ip) *(p1)
|
|
|
|
|
|
So, in clockwise order:
|
|
v : vertex point
|
|
p1: perpendicular on left side of segment1<1> (perp1)
|
|
ip: intersection point
|
|
p2: perpendicular on left side of segment2<0> (perp2)
|
|
*/
|
|
|
|
|
|
|
|
/*!
|
|
\brief Enumerates options for side of buffer (left/right w.r.t. directed
|
|
segment)
|
|
\ingroup enum
|
|
\details Around a linestring, a buffer can be defined left or right.
|
|
Around a polygon, assumed clockwise internally,
|
|
a buffer is either on the left side (inflates the polygon), or on the
|
|
right side (deflates the polygon)
|
|
*/
|
|
enum buffer_side_selector { buffer_side_left, buffer_side_right };
|
|
|
|
/*!
|
|
\brief Enumerates types of pieces (parts of buffer) around geometries
|
|
\ingroup enum
|
|
*/
|
|
enum piece_type
|
|
{
|
|
buffered_segment,
|
|
buffered_join,
|
|
buffered_round_end,
|
|
buffered_flat_end,
|
|
buffered_point,
|
|
buffered_concave, // always on the inside
|
|
piece_type_unknown
|
|
};
|
|
|
|
|
|
/*!
|
|
\brief Enumerates types of joins
|
|
\ingroup enum
|
|
*/
|
|
enum join_selector
|
|
{
|
|
join_convex,
|
|
join_concave,
|
|
join_continue, // collinear, next segment touches previous segment
|
|
join_spike // collinear, with overlap, next segment goes back
|
|
};
|
|
|
|
/*!
|
|
\brief Enumerates types of result codes from buffer strategies
|
|
\ingroup enum
|
|
*/
|
|
enum result_code
|
|
{
|
|
result_normal,
|
|
result_error_numerical,
|
|
result_no_output
|
|
};
|
|
|
|
|
|
}} // namespace strategy::buffer
|
|
|
|
|
|
}} // namespace boost::geometry
|
|
|
|
#endif // BOOST_GEOMETRY_STRATEGIES_CARTESIAN_BUFFER_HPP
|