Core/Object: Range check, Needs tested.

Port From (https://github.com/TrinityCore/TrinityCore/commit/b717603a9b3a676e800fc401f4544735287791a9)
2021-12-01 22:57:42 -05:00
parent 112970fb72
commit b4febb11c8
7 changed files with 291 additions and 31 deletions
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2012-2020 CypherCore <http://github.com/CypherCore>
+ * 
+ * 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 3 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/>.
+ */
+
+using System;
+using System.Numerics;
+
+namespace Framework.GameMath
+{
+    public class Box
+    {
+        public Vector3[] _edgeVector = new Vector3[3];
+        public Vector3 _center;
+        public float _area;
+        public float _volume;
+
+        public Box(Vector3 min, Vector3 max)
+        {
+            Vector3 bounds = new Vector3(max.X - min.X, max.Y - min.Y, max.Z - min.Z);
+            _edgeVector[0] = new Vector3(bounds.X, 0, 0);
+            _edgeVector[1] = new Vector3(0, bounds.Y, 0);
+            _edgeVector[2] = new Vector3(0, 0, bounds.Z);
+            bool finiteExtent = true;
+
+            for (int i = 0; i < 3; ++i)
+            {
+                if (!float.IsInfinity(_edgeVector[i].Length()))
+                {
+                    finiteExtent = false;
+                    // If the extent is infinite along an axis, make the center zero to avoid NaNs
+                    _center.SetAt(0.0f, i);
+                }
+            }
+
+
+            if (finiteExtent)
+            {
+                _volume = bounds.X * bounds.Y * bounds.Z;
+            }
+            else
+            {
+                _volume = float.PositiveInfinity;
+            }
+
+            _area = 2 *
+                (bounds.X * bounds.Y +
+                 bounds.Y * bounds.Z +
+                 bounds.Z * bounds.X);
+        }
+
+        public bool Contains(Vector3 point)
+        {
+            Vector3 u = _edgeVector[2];
+            Vector3 v = _edgeVector[1];
+            Vector3 w = _edgeVector[0];
+
+            Matrix4x4 M = new(u.X, v.X, w.X, 0.0f, u.Y, v.Y, w.Y, 0.0f, u.Z, v.Z, w.Z, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
+
+            // M^-1 * (point - _corner[0]) = point in unit cube's object space
+            // compute the inverse of M
+            Matrix4x4.Invert(M, out M);
+            Vector3 osPoint = Vector3.Transform(point - Corner(0), M);
+
+            return (osPoint.X >= 0) && (osPoint.Y >= 0) && (osPoint.Z >= 0) &&
+                (osPoint.X <= 1) && (osPoint.Y <= 1) && (osPoint.Z <= 1);
+        }
+
+        Vector3 Corner(int i)
+        {
+            switch (i)
+            {
+                case 0: return _center + (0.5f * (-_edgeVector[0] - _edgeVector[1] - _edgeVector[2]));
+                case 1: return _center + (0.5f * (_edgeVector[0] - _edgeVector[1] - _edgeVector[2]));
+                case 2: return _center + (0.5f * (-_edgeVector[0] + _edgeVector[1] - _edgeVector[2]));
+                case 3: return _center + (0.5f * (_edgeVector[0] + _edgeVector[1] - _edgeVector[2]));
+                case 4: return _center + (0.5f * (-_edgeVector[0] - _edgeVector[1] + _edgeVector[2]));
+                case 5: return _center + (0.5f * (_edgeVector[0] - _edgeVector[1] + _edgeVector[2]));
+                case 6: return _center + (0.5f * (-_edgeVector[0] + _edgeVector[1] + _edgeVector[2]));
+                default: return _center + (0.5f * (_edgeVector[0] + _edgeVector[1] + _edgeVector[2]));//case 7
+            }
+        }
+
+        public bool isFinite()
+        {
+            return float.IsInfinity(_volume);
+        }
+    }
+}