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/*
* Copyright (C) 2005-2008 MaNGOS <http://www.mangosproject.org/>
*
* This program is free software; you can redistribute it and/or modify
* it under 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "ObjectPosSelector.h"
ObjectPosSelector::ObjectPosSelector(float x,float y,float size,float dist)
: m_center_x(x),m_center_y(y),m_size(size),m_dist(dist)
{
m_anglestep = acos(m_dist/(m_dist+2*m_size));
m_nextUsedPos[USED_POS_PLUS] = m_UsedPosLists[USED_POS_PLUS].end();
m_nextUsedPos[USED_POS_MINUS] = m_UsedPosLists[USED_POS_MINUS].end();
m_smallStepAngle[USED_POS_PLUS] = 0;
m_smallStepAngle[USED_POS_MINUS] = 0;
m_smallStepOk[USED_POS_PLUS] = false;
m_smallStepOk[USED_POS_MINUS] = false;
m_smallStepNextUsedPos[USED_POS_PLUS] = NULL;
m_smallStepNextUsedPos[USED_POS_MINUS] = NULL;
}
ObjectPosSelector::UsedPosList::value_type const* ObjectPosSelector::nextUsedPos(UsedPosType uptype)
{
UsedPosList::const_iterator itr = m_nextUsedPos[uptype];
if(itr!=m_UsedPosLists[uptype].end())
++itr;
if(itr==m_UsedPosLists[uptype].end())
{
if(!m_UsedPosLists[~uptype].empty())
return &*m_UsedPosLists[~uptype].rbegin();
else
return NULL;
}
else
return &*itr;
}
void ObjectPosSelector::AddUsedPos(float size,float angle,float dist)
{
if(angle>=0)
m_UsedPosLists[USED_POS_PLUS].insert(UsedPosList::value_type(angle,UsedPos(1.0,size,dist)));
else
m_UsedPosLists[USED_POS_MINUS].insert(UsedPosList::value_type(-angle,UsedPos(-1.0,size,dist)));
}
void ObjectPosSelector::InitializeAngle()
{
m_nextUsedPos[USED_POS_PLUS] = m_UsedPosLists[USED_POS_PLUS].begin();
m_nextUsedPos[USED_POS_MINUS] = m_UsedPosLists[USED_POS_MINUS].begin();
m_smallStepAngle[USED_POS_PLUS] = 0;
m_smallStepAngle[USED_POS_MINUS] = 0;
m_smallStepOk[USED_POS_PLUS] = true;
m_smallStepOk[USED_POS_MINUS] = true;
}
bool ObjectPosSelector::FirstAngle(float& angle)
{
if(m_UsedPosLists[USED_POS_PLUS].empty() && !m_UsedPosLists[USED_POS_MINUS].empty() )
return NextAngleFor(*m_UsedPosLists[USED_POS_MINUS].begin(),1.0,USED_POS_PLUS,angle);
else if(m_UsedPosLists[USED_POS_MINUS].empty() && !m_UsedPosLists[USED_POS_PLUS].empty() )
return NextAngleFor(*m_UsedPosLists[USED_POS_PLUS].begin(),-1.0,USED_POS_MINUS,angle);
return false;
}
bool ObjectPosSelector::NextAngle(float& angle)
{
while(m_nextUsedPos[USED_POS_PLUS]!=m_UsedPosLists[USED_POS_PLUS].end() ||
m_nextUsedPos[USED_POS_MINUS]!=m_UsedPosLists[USED_POS_MINUS].end() ||
m_smallStepOk[USED_POS_PLUS] || m_smallStepOk[USED_POS_MINUS] )
{
// calculate next possible angle
if(NextPosibleAngle(angle))
return true;
}
return false;
}
bool ObjectPosSelector::NextUsedAngle(float& angle)
{
while(m_nextUsedPos[USED_POS_PLUS]!=m_UsedPosLists[USED_POS_PLUS].end() ||
m_nextUsedPos[USED_POS_MINUS]!=m_UsedPosLists[USED_POS_MINUS].end() )
{
// calculate next possible angle
if(!NextPosibleAngle(angle))
return true;
}
return false;
}
bool ObjectPosSelector::NextPosibleAngle( float& angle )
{
// ++ direction less updated
if( m_nextUsedPos[USED_POS_PLUS]!=m_UsedPosLists[USED_POS_PLUS].end() &&
(m_nextUsedPos[USED_POS_MINUS]==m_UsedPosLists[USED_POS_MINUS].end() || m_nextUsedPos[USED_POS_PLUS]->first <= m_nextUsedPos[USED_POS_MINUS]->first) )
{
bool ok;
if(m_smallStepOk[USED_POS_PLUS])
ok = NextSmallStepAngle(1.0,USED_POS_PLUS,angle);
else
ok = NextAngleFor(*m_nextUsedPos[USED_POS_PLUS],1.0,USED_POS_PLUS,angle);
if(!ok)
++m_nextUsedPos[USED_POS_PLUS]; // increase. only at fail (original or checked)
return ok;
}
// -- direction less updated
else if( m_nextUsedPos[USED_POS_MINUS]!=m_UsedPosLists[USED_POS_MINUS].end())
{
bool ok;
if(m_smallStepOk[USED_POS_MINUS])
ok = NextSmallStepAngle(-1.0,USED_POS_MINUS,angle);
else
ok = NextAngleFor(*m_nextUsedPos[USED_POS_MINUS],-1.0,USED_POS_MINUS,angle);
if(!ok)
++m_nextUsedPos[USED_POS_MINUS];
return ok;
}
else // both list empty
{
if( m_smallStepOk[USED_POS_PLUS] && (!m_smallStepOk[USED_POS_MINUS] || m_smallStepAngle[USED_POS_PLUS] <= m_smallStepAngle[USED_POS_MINUS]) )
{
return NextSmallStepAngle(1.0,USED_POS_PLUS,angle);
}
// -- direction less updated
else if( m_smallStepOk[USED_POS_MINUS] )
{
return NextSmallStepAngle(-1.0,USED_POS_MINUS,angle);
}
}
// no angles
return false;
}
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