BambuStudio/libigl/igl/copyleft/cgal/BinaryWindingNumberOperatio...

168 lines
5.2 KiB
C
Raw Normal View History

2024-12-20 06:44:50 +00:00
// This file is part of libigl, a simple c++ geometry processing library.
//
// Copyright (C) 2015 Qingnan Zhou <qnzhou@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License
// v. 2.0. If a copy of the MPL was not distributed with this file, You can
// obtain one at http://mozilla.org/MPL/2.0/.
//
#ifndef IGL_COPYLEFT_CGAL_BINARY_WINDING_NUMBER_OPERATIONS_H
#define IGL_COPYLEFT_CGAL_BINARY_WINDING_NUMBER_OPERATIONS_H
#include <stdexcept>
#include "../../igl_inline.h"
#include "../../MeshBooleanType.h"
#include <Eigen/Core>
// TODO: This is not written according to libigl style. These should be
// function handles.
//
// Why is this templated on DerivedW
//
// These are all generalized to n-ary operations
namespace igl
{
namespace copyleft
{
namespace cgal
{
template <igl::MeshBooleanType Op>
class BinaryWindingNumberOperations {
public:
template<typename DerivedW>
typename DerivedW::Scalar operator()(
const Eigen::PlainObjectBase<DerivedW>& /*win_nums*/) const {
throw (std::runtime_error("not implemented!"));
}
};
// A B ... Z
template <>
class BinaryWindingNumberOperations<MESH_BOOLEAN_TYPE_UNION> {
public:
template<typename DerivedW>
typename DerivedW::Scalar operator()(
const Eigen::PlainObjectBase<DerivedW>& win_nums) const
{
for(int i = 0;i<win_nums.size();i++)
{
if(win_nums(i) > 0) return true;
}
return false;
}
};
// A ∩ B ∩ ... ∩ Z
template <>
class BinaryWindingNumberOperations<MESH_BOOLEAN_TYPE_INTERSECT> {
public:
template<typename DerivedW>
typename DerivedW::Scalar operator()(
const Eigen::PlainObjectBase<DerivedW>& win_nums) const
{
for(int i = 0;i<win_nums.size();i++)
{
if(win_nums(i)<=0) return false;
}
return true;
}
};
// A \ B \ ... \ Z = A \ (B ... Z)
template <>
class BinaryWindingNumberOperations<MESH_BOOLEAN_TYPE_MINUS> {
public:
template<typename DerivedW>
typename DerivedW::Scalar operator()(
const Eigen::PlainObjectBase<DerivedW>& win_nums) const
{
assert(win_nums.size()>1);
// Union of objects 1 through n-1
bool union_rest = false;
for(int i = 1;i<win_nums.size();i++)
{
union_rest = union_rest || win_nums(i) > 0;
if(union_rest) break;
}
// Must be in object 0 and not in union of objects 1 through n-1
return win_nums(0) > 0 && !union_rest;
}
};
// A ∆ B ∆ ... ∆ Z (equivalent to set inside odd number of objects)
template <>
class BinaryWindingNumberOperations<MESH_BOOLEAN_TYPE_XOR> {
public:
template<typename DerivedW>
typename DerivedW::Scalar operator()(
const Eigen::PlainObjectBase<DerivedW>& win_nums) const
{
// If inside an odd number of objects
int count = 0;
for(int i = 0;i<win_nums.size();i++)
{
if(win_nums(i) > 0) count++;
}
return count % 2 == 1;
}
};
template <>
class BinaryWindingNumberOperations<MESH_BOOLEAN_TYPE_RESOLVE> {
public:
template<typename DerivedW>
typename DerivedW::Scalar operator()(
const Eigen::PlainObjectBase<DerivedW>& /*win_nums*/) const {
return true;
}
};
typedef BinaryWindingNumberOperations<MESH_BOOLEAN_TYPE_UNION> BinaryUnion;
typedef BinaryWindingNumberOperations<MESH_BOOLEAN_TYPE_INTERSECT> BinaryIntersect;
typedef BinaryWindingNumberOperations<MESH_BOOLEAN_TYPE_MINUS> BinaryMinus;
typedef BinaryWindingNumberOperations<MESH_BOOLEAN_TYPE_XOR> BinaryXor;
typedef BinaryWindingNumberOperations<MESH_BOOLEAN_TYPE_RESOLVE> BinaryResolve;
enum KeeperType {
KEEP_INSIDE,
KEEP_ALL
};
template<KeeperType T>
class WindingNumberFilter {
public:
template<typename DerivedW>
short operator()(
const Eigen::PlainObjectBase<DerivedW>& /*win_nums*/) const {
throw std::runtime_error("Not implemented");
}
};
template<>
class WindingNumberFilter<KEEP_INSIDE> {
public:
template<typename T>
short operator()(T out_w, T in_w) const {
if (in_w > 0 && out_w <= 0) return 1;
else if (in_w <= 0 && out_w > 0) return -1;
else return 0;
}
};
template<>
class WindingNumberFilter<KEEP_ALL> {
public:
template<typename T>
short operator()(T /*out_w*/, T /*in_w*/) const {
return 1;
}
};
typedef WindingNumberFilter<KEEP_INSIDE> KeepInside;
typedef WindingNumberFilter<KEEP_ALL> KeepAll;
}
}
}
#endif