* Reimplementing Terrain as Region Modules

* New method involves interfaces for
** Terrain Paint Brushes (ie raise brush, lower brush, etc)
** Terrain Flood Brushes (ie raise area, lower area, etc)
** Terrain Effects (ie erosion, etc) [= W.I.P, not committed]
* Provided sample implementation for Raise Paint and Raise Area brushes.

OpenSim/Region/Environment/Modules/Terrain/FloodBrushes/RaiseArea.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using OpenSim.Region.Environment.Modules.Terrain;
+using OpenSim.Region.Environment.Interfaces;
+
+namespace OpenSim.Region.Environment.Modules.Terrain.FloodBrushes
+{
+    class RaiseArea : ITerrainFloodEffect
+    {
+        #region ITerrainFloodEffect Members
+
+        public void FloodEffect(ITerrainChannel map, bool[,] fillArea, double strength)
+        {
+            int x, y;
+            for (x = 0; x < map.Width; x++)
+            {
+                for (y = 0; y < map.Height; y++)
+                {
+                    if (fillArea[x, y] == true)
+                    {
+                        map[x, y] += strength;
+                    }
+                }
+            }
+        }
+
+        #endregion
+    }
+}

OpenSim/Region/Environment/Modules/Terrain/PaintBrushes/RaiseSphere.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using OpenSim.Region.Environment.Modules.Terrain;
+using OpenSim.Region.Environment.Interfaces;
+
+namespace OpenSim.Region.Environment.Modules.Terrain.PaintBrushes
+{
+    class RaiseSphere : ITerrainPaintableEffect
+    {
+        #region ITerrainPaintableEffect Members
+
+        public void PaintEffect(ITerrainChannel map, double rx, double ry, double strength)
+        {
+            int x, y;
+            for (x = 0; x < map.Width; x++)
+            {
+                // Skip everything unlikely to be affected
+                if (Math.Abs(x - rx) > strength * 1.1)
+                    continue;
+
+                for (y = 0; y < map.Height; y++)
+                {
+                    // Skip everything unlikely to be affected
+                    if (Math.Abs(y - ry) > strength * 1.1)
+                        continue;
+
+                    // Calculate a sphere and add it to the heighmap
+                    double z = strength;
+                    z *= z;
+                    z -= ((x - rx) * (x - rx)) + ((y - ry) * (y - ry));
+
+                    if (z > 0.0)
+                        map[x, y] += z;
+                }
+            }
+        }
+
+        #endregion
+    }
+}

OpenSim/Region/Environment/Modules/Terrain/TerrainModule.cs

@@ -39,6 +39,16 @@ using libsecondlife;
 
 namespace OpenSim.Region.Environment.Modules.Terrain
 {
+    public interface ITerrainPaintableEffect
+    {
+        void PaintEffect(ITerrainChannel map, double x, double y, double strength);
+    }
+
+    public interface ITerrainFloodEffect
+    {
+        void FloodEffect(ITerrainChannel map, Boolean[,] fillArea, double strength);
+    }
+
     /// <summary>
     /// A new version of the old Channel class, simplified
     /// </summary>