Imported MaNGOS revision 6767 from http://mangos.svn.sourceforge.net/svnroot/mangos/trunk/

src/game/ObjectPosSelector.cpp

@@ -0,0 +1,157 @@
+/*
+ * Copyright (C) 2005-2008 MaNGOS <http://getmangos.com/>
+ *
+ * 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;
+}