First Commit

For Azeroth!

src/server/game/Entities/Object/ObjectPosSelector.cpp

@@ -0,0 +1,153 @@
+/*
+ * Copyright (C) 
+ * Copyright (C) 
+ *
+ * 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 = 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(1.0f, 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;
+}