mirror of https://github.com/axmolengine/axmol.git
120 lines
4.0 KiB
C++
120 lines
4.0 KiB
C++
/*******************************************************************************
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* Author : Angus Johnson *
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* Version : Clipper2 - ver.1.0.0 *
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* Date : 3 August 2022 *
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* Website : http://www.angusj.com *
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* Copyright : Angus Johnson 2010-2022 *
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* Purpose : Minkowski Sum and Difference *
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* License : http://www.boost.org/LICENSE_1_0.txt *
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*******************************************************************************/
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#ifndef CLIPPER_MINKOWSKI_H
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#define CLIPPER_MINKOWSKI_H
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#include <cstdlib>
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#include <vector>
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#include <string>
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#include "clipper.core.h"
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namespace Clipper2Lib
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{
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namespace detail
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{
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inline Paths64 Minkowski(const Path64& pattern, const Path64& path, bool isSum, bool isClosed)
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{
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size_t delta = isClosed ? 0 : 1;
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size_t patLen = pattern.size(), pathLen = path.size();
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if (patLen == 0 || pathLen == 0) return Paths64();
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Paths64 tmp;
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tmp.reserve(pathLen);
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if (isSum)
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{
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for (Point64 pt : path)
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{
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Path64 path2(pattern.size());
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std::transform(pattern.cbegin(), pattern.cend(),
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path2.begin(), [pt](const Point64& pt2) {return pt + pt2; });
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tmp.push_back(path2);
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}
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}
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else
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{
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for (Point64 pt : path)
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{
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Path64 path2(pattern.size());
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std::transform(pattern.cbegin(), pattern.cend(),
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path2.begin(), [pt](const Point64& pt2) {return pt - pt2; });
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tmp.push_back(path2);
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}
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}
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Paths64 result;
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result.reserve((pathLen - delta) * patLen);
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size_t g = isClosed ? pathLen - 1 : 0;
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for (size_t h = patLen - 1, i = delta; i < pathLen; ++i)
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{
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for (size_t j = 0; j < patLen; j++)
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{
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Path64 quad;
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quad.reserve(4);
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{
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quad.push_back(tmp[g][h]);
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quad.push_back(tmp[i][h]);
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quad.push_back(tmp[i][j]);
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quad.push_back(tmp[g][j]);
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};
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if (!IsPositive(quad))
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std::reverse(quad.begin(), quad.end());
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result.push_back(quad);
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h = j;
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}
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g = i;
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}
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return result;
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}
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inline Paths64 Union(const Paths64& subjects, FillRule fillrule)
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{
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Paths64 result;
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Clipper64 clipper;
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clipper.AddSubject(subjects);
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clipper.Execute(ClipType::Union, fillrule, result);
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return result;
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}
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} // namespace internal
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inline Paths64 MinkowskiSum(const Path64& pattern, const Path64& path, bool isClosed)
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{
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return detail::Union(detail::Minkowski(pattern, path, true, isClosed), FillRule::NonZero);
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}
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inline PathsD MinkowskiSum(const PathD& pattern, const PathD& path, bool isClosed, int decimalPlaces = 2)
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{
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double scale = pow(10, decimalPlaces);
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Path64 pat64 = ScalePath<int64_t, double>(pattern, scale);
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Path64 path64 = ScalePath<int64_t, double>(path, scale);
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Paths64 tmp = detail::Union(detail::Minkowski(pat64, path64, true, isClosed), FillRule::NonZero);
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return ScalePaths<double, int64_t>(tmp, 1 / scale);
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}
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inline Paths64 MinkowskiDiff(const Path64& pattern, const Path64& path, bool isClosed)
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{
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return detail::Union(detail::Minkowski(pattern, path, false, isClosed), FillRule::NonZero);
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}
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inline PathsD MinkowskiDiff(const PathD& pattern, const PathD& path, bool isClosed, int decimalPlaces = 2)
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{
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double scale = pow(10, decimalPlaces);
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Path64 pat64 = ScalePath<int64_t, double>(pattern, scale);
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Path64 path64 = ScalePath<int64_t, double>(path, scale);
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Paths64 tmp = detail::Union(detail::Minkowski(pat64, path64, false, isClosed), FillRule::NonZero);
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return ScalePaths<double, int64_t>(tmp, 1 / scale);
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}
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} // Clipper2Lib namespace
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#endif // CLIPPER_MINKOWSKI_H
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