From eae7be1e36733580f67da742403147701f8a8d08 Mon Sep 17 00:00:00 2001
From: Adam Frisby <adam@gwala.net>
Date: Tue, 26 Feb 2008 14:51:13 +0000
Subject: [PATCH] * 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.

---
 .../Modules/Terrain/FloodBrushes/RaiseArea.cs | 30 ++++++++++++++
 .../Terrain/PaintBrushes/RaiseSphere.cs       | 41 +++++++++++++++++++
 .../Modules/Terrain/TerrainModule.cs          | 10 +++++
 3 files changed, 81 insertions(+)
 create mode 100644 OpenSim/Region/Environment/Modules/Terrain/FloodBrushes/RaiseArea.cs
 create mode 100644 OpenSim/Region/Environment/Modules/Terrain/PaintBrushes/RaiseSphere.cs

diff --git a/OpenSim/Region/Environment/Modules/Terrain/FloodBrushes/RaiseArea.cs b/OpenSim/Region/Environment/Modules/Terrain/FloodBrushes/RaiseArea.cs
new file mode 100644
index 0000000000..ce83a4caf4
--- /dev/null
+++ b/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
+    }
+}
diff --git a/OpenSim/Region/Environment/Modules/Terrain/PaintBrushes/RaiseSphere.cs b/OpenSim/Region/Environment/Modules/Terrain/PaintBrushes/RaiseSphere.cs
new file mode 100644
index 0000000000..cf95f3fb2e
--- /dev/null
+++ b/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
+    }
+}
diff --git a/OpenSim/Region/Environment/Modules/Terrain/TerrainModule.cs b/OpenSim/Region/Environment/Modules/Terrain/TerrainModule.cs
index 1b765eb63b..4f8b377eda 100644
--- a/OpenSim/Region/Environment/Modules/Terrain/TerrainModule.cs
+++ b/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>