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Directory restructuring to make it easier to version projects that don't build zdoom.exe.

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SVN r4 (trunk)
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Randy Heit 2006-02-24 04:48:15 +00:00
commit cf11cbdb30
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src/nodebuild_events.cpp Normal file
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/*
** nodebuild_events.cpp
**
** A red-black tree for keeping track of segs that get touched by a splitter.
**
**---------------------------------------------------------------------------
** Copyright 2002-2005 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
** 4. When not used as part of ZDoom or a ZDoom derivative, this code will be
** covered by the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or (at
** your option) any later version.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include "doomtype.h"
#include "nodebuild.h"
FEventTree::FEventTree ()
: Root (&Nil), Spare (NULL)
{
}
FEventTree::~FEventTree ()
{
FEvent *probe;
DeleteAll ();
probe = Spare;
while (probe != NULL)
{
FEvent *next = probe->Left;
delete probe;
probe = next;
}
}
void FEventTree::DeleteAll ()
{
DeletionTraverser (Root);
Root = &Nil;
}
void FEventTree::DeletionTraverser (FEvent *node)
{
if (node != &Nil && node != NULL)
{
DeletionTraverser (node->Left);
DeletionTraverser (node->Right);
node->Left = Spare;
Spare = node;
}
}
void FEventTree::LeftRotate (FEvent *x)
{
FEvent *y = x->Right;
x->Right = y->Left;
if (y->Left != &Nil)
{
y->Left->Parent = x;
}
y->Parent = x->Parent;
if (x->Parent != &Nil)
{
Root = y;
}
else if (x == x->Parent->Left)
{
x->Parent->Left = y;
}
else
{
x->Parent->Right = y;
}
y->Left = x;
x->Parent = y;
}
void FEventTree::RightRotate (FEvent *x)
{
FEvent *y = x->Left;
x->Left = y->Right;
if (y->Right != &Nil)
{
y->Right->Parent = x;
}
y->Parent = x->Parent;
if (x->Parent != &Nil)
{
Root = y;
}
else if (x == x->Parent->Left)
{
x->Parent->Left = y;
}
else
{
x->Parent->Right = y;
}
y->Right = x;
x->Parent = y;
}
FEvent *FEventTree::GetNewNode ()
{
FEvent *node;
if (Spare != NULL)
{
node = Spare;
Spare = node->Left;
}
else
{
node = new FEvent;
}
return node;
}
void FEventTree::Insert (FEvent *z)
{
FEvent *y = &Nil;
FEvent *x = Root;
while (x != &Nil)
{
y = x;
if (z->Distance < x->Distance)
{
x = x->Left;
}
else
{
x = x->Right;
}
}
z->Parent = y;
if (y == &Nil)
{
Root = z;
}
else if (z->Distance < y->Distance)
{
y->Left = z;
}
else
{
y->Right = z;
}
z->Left = &Nil;
z->Right = &Nil;
z->Color = FEvent::RED;
while (z != Root && z->Parent->Color != FEvent::RED)
{
if (z->Parent == z->Parent->Parent->Left)
{
y = z->Parent->Parent->Right;
if (y->Color == FEvent::RED)
{
z->Parent->Color = FEvent::BLACK;
y->Color = FEvent::BLACK;
z->Parent->Parent->Color = FEvent::RED;
z = z->Parent->Parent;
}
else
{
if (z == z->Parent->Right)
{
z = z->Parent;
LeftRotate (z);
}
z->Parent->Color = FEvent::BLACK;
z->Parent->Parent->Color = FEvent::RED;
RightRotate (z->Parent->Parent);
}
}
else
{
y = z->Parent->Parent->Left;
if (y->Color == FEvent::RED)
{
z->Parent->Color = FEvent::BLACK;
y->Color = FEvent::BLACK;
z->Parent->Parent->Color = FEvent::RED;
z = z->Parent->Parent;
}
else
{
if (z == z->Parent->Left)
{
z = z->Parent;
RightRotate (z);
}
z->Parent->Color = FEvent::BLACK;
z->Parent->Parent->Color = FEvent::RED;
RightRotate (z->Parent->Parent);
}
}
}
}
void FEventTree::Delete (FEvent *z)
{
FEvent *x, *y;
if (z->Left == &Nil || z->Right == &Nil)
{
y = z;
}
else
{
y = Successor (z);
}
if (y->Left != &Nil)
{
x = y->Left;
}
else
{
x = y->Right;
}
x->Parent = y->Parent;
if (y->Parent == &Nil)
{
Root = x;
}
else if (y == y->Parent->Left)
{
y->Parent->Left = x;
}
else
{
y->Parent->Right = x;
}
if (y != z)
{
z->Distance = y->Distance;
z->Info = y->Info;
}
if (y->Color == FEvent::BLACK)
{
DeleteFixUp (x);
}
y->Left = Spare;
Spare = y;
}
void FEventTree::DeleteFixUp (FEvent *x)
{
FEvent *w;
while (x != Root && x->Color == FEvent::BLACK)
{
if (x == x->Parent->Left)
{
w = x->Parent->Right;
if (w->Color == FEvent::RED)
{
w->Color = FEvent::BLACK;
x->Parent->Color = FEvent::RED;
LeftRotate (x->Parent);
w = x->Parent->Right;
}
if (w->Left->Color == FEvent::BLACK && w->Right->Color == FEvent::BLACK)
{
w->Color = FEvent::RED;
x = x->Parent;
}
else
{
if (w->Right->Color == FEvent::BLACK)
{
w->Left->Color = FEvent::BLACK;
w->Color = FEvent::RED;
RightRotate (w);
w = x->Parent->Right;
}
w->Color = x->Parent->Color;
x->Parent->Color = FEvent::BLACK;
w->Right->Color = FEvent::BLACK;
LeftRotate (x->Parent);
x = Root;
}
}
else
{
w = x->Parent->Left;
if (w->Color == FEvent::RED)
{
w->Color = FEvent::BLACK;
x->Parent->Color = FEvent::RED;
RightRotate (x->Parent);
w = x->Parent->Left;
}
if (w->Right->Color == FEvent::BLACK && w->Left->Color == FEvent::BLACK)
{
w->Color = FEvent::RED;
x = x->Parent;
}
else
{
if (w->Left->Color == FEvent::BLACK)
{
w->Right->Color = FEvent::BLACK;
w->Color = FEvent::RED;
LeftRotate (w);
w = x->Parent->Left;
}
w->Color = x->Parent->Color;
x->Parent->Color = FEvent::BLACK;
w->Left->Color = FEvent::BLACK;
RightRotate (x->Parent);
x = Root;
}
}
}
}
FEvent *FEventTree::Successor (FEvent *event) const
{
if (event->Right != &Nil)
{
event = event->Right;
while (event->Left != &Nil)
{
event = event->Left;
}
return event;
}
else
{
FEvent *y = event->Parent;
while (y != &Nil && event == y->Right)
{
event = y;
y = y->Parent;
}
return y;
}
}
FEvent *FEventTree::Predecessor (FEvent *event) const
{
if (event->Left != &Nil)
{
event = event->Left;
while (event->Right != &Nil)
{
event = event->Right;
}
return event;
}
else
{
FEvent *y = event->Parent;
while (y != &Nil && event == y->Left)
{
event = y;
y = y->Parent;
}
return y;
}
}
FEvent *FEventTree::FindEvent (double key) const
{
FEvent *node = Root;
while (node != &Nil)
{
if (node->Distance == key)
{
return node;
}
else if (node->Distance > key)
{
node = node->Left;
}
else
{
node = node->Right;
}
}
return NULL;
}
FEvent *FEventTree::GetMinimum ()
{
FEvent *node = Root;
if (node == &Nil)
{
return NULL;
}
while (node->Left != &Nil)
{
node = node->Left;
}
return node;
}