83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
|
/*
|
||
|
|
Bullet Continuous Collision Detection and Physics Library
|
||
|
|
Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
|
||
|
|
|
||
|
|
This software is provided 'as-is', without any express or implied warranty.
|
||
|
|
In no event will the authors be held liable for any damages arising from the use of this software.
|
||
|
|
Permission is granted to anyone to use this software for any purpose,
|
||
|
|
including commercial applications, and to alter it and redistribute it freely,
|
||
|
|
subject to the following restrictions:
|
||
|
|
|
||
|
|
1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
|
||
|
|
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
|
||
|
|
3. This notice may not be removed or altered from any source distribution.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "btUnionFind.h"
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
btUnionFind::~btUnionFind()
|
||
|
|
{
|
||
|
|
Free();
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
btUnionFind::btUnionFind()
|
||
|
|
{
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
void btUnionFind::allocate(int N)
|
||
|
|
{
|
||
|
|
m_elements.resize(N);
|
||
|
|
}
|
||
|
|
void btUnionFind::Free()
|
||
|
|
{
|
||
|
|
m_elements.clear();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void btUnionFind::reset(int N)
|
||
|
|
{
|
||
|
|
allocate(N);
|
||
|
|
|
||
|
|
for (int i = 0; i < N; i++)
|
||
|
|
{
|
||
|
|
m_elements[i].m_id = i; m_elements[i].m_sz = 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
class btUnionFindElementSortPredicate
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
bool operator() ( const btElement& lhs, const btElement& rhs ) const
|
||
|
|
{
|
||
|
|
return lhs.m_id < rhs.m_id;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
///this is a special operation, destroying the content of btUnionFind.
|
||
|
|
///it sorts the elements, based on island id, in order to make it easy to iterate over islands
|
||
|
|
void btUnionFind::sortIslands()
|
||
|
|
{
|
||
|
|
|
||
|
|
//first store the original body index, and islandId
|
||
|
|
int numElements = m_elements.size();
|
||
|
|
|
||
|
|
for (int i=0;i<numElements;i++)
|
||
|
|
{
|
||
|
|
m_elements[i].m_id = find(i);
|
||
|
|
#ifndef STATIC_SIMULATION_ISLAND_OPTIMIZATION
|
||
|
|
m_elements[i].m_sz = i;
|
||
|
|
#endif //STATIC_SIMULATION_ISLAND_OPTIMIZATION
|
||
|
|
}
|
||
|
|
|
||
|
|
// Sort the vector using predicate and std::sort
|
||
|
|
//std::sort(m_elements.begin(), m_elements.end(), btUnionFindElementSortPredicate);
|
||
|
|
m_elements.quickSort(btUnionFindElementSortPredicate());
|
||
|
|
|
||
|
|
}
|