1 files changed, 75 insertions, 0 deletions
diff --git a/src/game-server/collisiondetection.cpp b/src/game-server/collisiondetection.cpp
new file mode 100644
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+++ b/src/game-server/collisiondetection.cpp
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+/*
+ *  The Mana World Server
+ *  Copyright 2004 The Mana World Development Team
+ *
+ *  This file is part of The Mana World.
+ *
+ *  The Mana World  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 any later version.
+ *
+ *  The Mana  World 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 The Mana  World; if not, write to the  Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *  $Id: being.cpp 3010 2007-01-05 20:12:51Z gmelquio $
+ */
+
+#include "collisiondetection.hpp"
+
+#include "point.h"
+
+#include <cmath>
+
+bool
+Collision::circleWithCirclesector(  const Point& circlePos, int circleRadius,
+                                    const Point& secPos, int secRadius, float secAngle, float secSize)
+{
+    float targetAngle;
+
+    //calculate distance
+    int distX = circlePos.x - secPos.x;
+    int distY = circlePos.y - secPos.y;
+    float dist = sqrt(distX * distX + distY * distY);
+
+    //if out of range we can't hit it
+    if (dist > secRadius + circleRadius) {
+        return false;
+    }
+    //if we are standing in it we hit it in any case
+    if (dist < circleRadius) {
+        return true;
+    }
+
+    //calculate target angle
+    if (distX > 0)
+    {
+        targetAngle = asin(-distY / dist);
+    } else {
+        if (distY < 0)
+        {
+            targetAngle = M_PI - asin(-distY / dist);
+        } else {
+            targetAngle = -M_PI - asin(-distY / dist);
+        }
+
+    }
+
+    //calculate difference from segment angle
+    float targetDiff = fabs(targetAngle - secAngle);
+    if (targetDiff > M_PI)
+    {
+        targetDiff = fabs(targetDiff - M_PI * 2);
+    }
+
+
+    //Add hit circle
+    secSize += asin(circleRadius/dist) * 2;
+
+    return (targetDiff < secSize / 2.0f);
+}