ObjectPosSelector.cpp

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
 
#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 = std::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] = nullptr;
 m_smallStepNextUsedPos[USED_POS_MINUS] = nullptr;
}
 
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 nullptr;
 }
 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(1.0f, size, dist)));
 else
 m_UsedPosLists[USED_POS_MINUS].insert(UsedPosList::value_type(-angle, UsedPos(-1.0f, 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(), 1.0f, 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(), -1.0f, 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(1.0f, USED_POS_PLUS, angle);
 else
 ok = NextAngleFor(*m_nextUsedPos[USED_POS_PLUS], 1.0f, 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(-1.0f, USED_POS_MINUS, angle);
 else
 ok = NextAngleFor(*m_nextUsedPos[USED_POS_MINUS], -1.0f, 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(1.0f, USED_POS_PLUS, angle);
 // -- direction less updated
 else if (m_smallStepOk[USED_POS_MINUS])
 return NextSmallStepAngle(-1.0f, USED_POS_MINUS, angle);
 }
 
 // no angles
 return false;
}