Start work on Transform classes, which can transform the output of draw operations.

Drawing/BrushFactories/BrushFactory.cs

@@ -47,18 +47,18 @@ namespace MCGalaxy.Drawing.Brushes {
         public static string Available { get { return Brushes.Join(b => b.Name); } }
         
         public static BrushFactory Find(string name) {
-            foreach (BrushFactory brush in Brushes) {
-                if (brush.Name.CaselessEq(name)) return brush;
+            foreach (BrushFactory entry in Brushes) {
+                if (entry.Name.CaselessEq(name)) return entry;
             }
             return null;
         }
     }
     
     public struct BrushArgs {
-        /// <summary> Player that is providing arguments for this brush. </summary>
+        /// <summary> Player that is providing arguments. </summary>
         public Player Player;
         
-        /// <summary> Raw message provided for arguments to the brush, including spaces. </summary>
+        /// <summary> Raw message provided for arguments, including spaces. </summary>
         public string Message;
         
         /// <summary> Raw block the player is currently holding. </summary>

Drawing/Transform/SimpleTransforms.cs

@@ -0,0 +1,34 @@
+/*
+    Copyright 2015 MCGalaxy
+        
+    Dual-licensed under the Educational Community License, Version 2.0 and
+    the GNU General Public License, Version 3 (the "Licenses"); you may
+    not use this file except in compliance with the Licenses. You may
+    obtain a copy of the Licenses at
+    
+    http://www.opensource.org/licenses/ecl2.php
+    http://www.gnu.org/licenses/gpl-3.0.html
+    
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the Licenses are distributed on an "AS IS"
+    BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+    or implied. See the Licenses for the specific language governing
+    permissions and limitations under the Licenses.
+ */
+using System;
+using System.Collections.Generic;
+using MCGalaxy.Drawing.Brushes;
+using MCGalaxy.Drawing.Ops;
+
+namespace MCGalaxy.Drawing.Transforms {
+    public sealed class NoTransform : Transform {
+        
+        /// <summary> Human friendly name of this transform. </summary>
+        public override string Name { get { return "None"; } }
+        
+        public override IEnumerable<DrawOpBlock> Perform(Vec3S32[] marks, Player p, 
+                                                        Level lvl, DrawOp op, Brush brush) {
+            return op.Perform(marks, p, lvl, brush);
+        }
+    }
+}

Drawing/Transform/Transform.cs

@@ -0,0 +1,35 @@
+/*
+    Copyright 2015 MCGalaxy
+        
+    Dual-licensed under the Educational Community License, Version 2.0 and
+    the GNU General Public License, Version 3 (the "Licenses"); you may
+    not use this file except in compliance with the Licenses. You may
+    obtain a copy of the Licenses at
+    
+    http://www.opensource.org/licenses/ecl2.php
+    http://www.gnu.org/licenses/gpl-3.0.html
+    
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the Licenses are distributed on an "AS IS"
+    BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+    or implied. See the Licenses for the specific language governing
+    permissions and limitations under the Licenses.
+ */
+using System;
+using System.Collections.Generic;
+using MCGalaxy.Drawing.Brushes;
+using MCGalaxy.Drawing.Ops;
+
+namespace MCGalaxy.Drawing.Transforms {
+    public abstract class Transform {
+        
+        /// <summary> Human friendly name of this transform. </summary>
+        public abstract string Name { get; }
+        
+        /// <summary> Performs calcuations (if necessary) for the given drawop. </summary>
+        public virtual void Configure(DrawOp op, Player p) { }
+        
+        public abstract IEnumerable<DrawOpBlock> Perform(Vec3S32[] marks, Player p, 
+                                                        Level lvl, DrawOp op, Brush brush);
+    }
+}

Drawing/TransformFactories/SimpleTransforms.cs

@@ -0,0 +1,38 @@
+/*
+    Copyright 2015 MCGalaxy
+        
+    Dual-licensed under the Educational Community License, Version 2.0 and
+    the GNU General Public License, Version 3 (the "Licenses"); you may
+    not use this file except in compliance with the Licenses. You may
+    obtain a copy of the Licenses at
+    
+    http://www.opensource.org/licenses/ecl2.php
+    http://www.gnu.org/licenses/gpl-3.0.html
+    
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the Licenses are distributed on an "AS IS"
+    BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+    or implied. See the Licenses for the specific language governing
+    permissions and limitations under the Licenses.
+ */
+using System;
+using MCGalaxy.Commands.Building;
+using MCGalaxy.Drawing.Brushes;
+
+namespace MCGalaxy.Drawing.Transforms {
+    public sealed class NoTransformFactory : TransformFactory {        
+        public override string Name { get { return "None"; } }
+        public override string[] Help { get { return HelpString; } }
+        
+        static string[] HelpString = new [] {
+            "%TArguments: none",
+            "%HDoes not affect the output of draw operations.",
+        };
+        
+        public override Transform Construct(BrushArgs args) {
+            return new NoTransform();
+        }
+        
+        public override bool Validate(BrushArgs args) { return true; }
+    }
+}

Drawing/TransformFactories/TransformFactory.cs

@@ -0,0 +1,53 @@
+/*
+    Copyright 2015 MCGalaxy
+        
+    Dual-licensed under the Educational Community License, Version 2.0 and
+    the GNU General Public License, Version 3 (the "Licenses"); you may
+    not use this file except in compliance with the Licenses. You may
+    obtain a copy of the Licenses at
+    
+    http://www.opensource.org/licenses/ecl2.php
+    http://www.gnu.org/licenses/gpl-3.0.html
+    
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the Licenses are distributed on an "AS IS"
+    BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+    or implied. See the Licenses for the specific language governing
+    permissions and limitations under the Licenses.
+ */
+using System;
+using System.Collections.Generic;
+using MCGalaxy.Commands;
+using MCGalaxy.Drawing.Brushes;
+using MCGalaxy.Drawing.Ops;
+
+namespace MCGalaxy.Drawing.Transforms {
+    public abstract class TransformFactory {
+        
+        /// <summary> Human friendly name of this transform. </summary>
+        public abstract string Name { get; }
+        
+        /// <summary> Description of the transform, in addition to its syntax. </summary>
+        public abstract string[] Help { get; }
+        
+        /// <summary> Creates a transform from the given arguments, 
+        /// returning null if invalid arguments are specified. </summary>
+        public abstract Transform Construct(BrushArgs args);
+        
+        /// <summary> Validates the given arguments, returning false if they are invalid. </summary>
+        public virtual bool Validate(BrushArgs args) { return Construct(args) != null; }
+        
+        public static List<TransformFactory> Transforms = new List<TransformFactory>() {
+            new NoTransformFactory(),
+        };
+        
+        public static string Available { get { return Transforms.Join(b => b.Name); } }
+        
+        public static TransformFactory Find(string name) {
+            foreach (TransformFactory entry in Transforms) {
+                if (entry.Name.CaselessEq(name)) return entry;
+            }
+            return null;
+        }
+    }
+}

MCGalaxy_.csproj

@@ -452,6 +452,10 @@
     <Compile Include="Drawing\Flip.cs" />
     <Compile Include="Drawing\Image\ImagePalette.cs" />
     <Compile Include="Drawing\Image\IPalette.cs" />
+    <Compile Include="Drawing\TransformFactories\SimpleTransforms.cs" />
+    <Compile Include="Drawing\TransformFactories\TransformFactory.cs" />
+    <Compile Include="Drawing\Transform\SimpleTransforms.cs" />
+    <Compile Include="Drawing\Transform\Transform.cs" />
     <Compile Include="Economy\Awards.cs" />
     <Compile Include="Economy\ReviveItem.cs" />
     <Compile Include="Economy\ZombieItems.cs" />
@@ -700,6 +704,8 @@
     <Folder Include="Drawing\Brushes" />
     <Folder Include="Drawing\Image" />
     <Folder Include="Drawing\BrushFactories" />
+    <Folder Include="Drawing\TransformFactories" />
+    <Folder Include="Drawing\Transform" />
     <Folder Include="Games\Countdown" />
     <Folder Include="Games\LavaSurvival" />
     <Folder Include="Games\TntWars" />