+ Implemented Position on Cylinder, Sphere, Text3D

+ Made the executive decision that Text3D in OSCADSharp is always centered in script output, to facilitate correct position calculation.

OSCADSharp/OSCADSharp.ConsoleTests/Program.cs

@@ -13,15 +13,15 @@ namespace OSCADSharp.ConsoleTests
     {
         static void Main(string[] args)
         {
-            var cube = new Cube(13, 13, 13).Rotate(90, 37.5, -180);
+            var obj = new Text3D("Hello, it's Meeeee.");
 
-            var pos = cube.Position();
+            var pos = obj.Position();
             var cyl1 = new Cylinder(1, 100, true).Translate(pos);
             var cyl2 = new Cylinder(1, 100, true).Rotate(0, 90, 0).Translate(pos);
             var cyl3 = new Cylinder(1, 100, true).Rotate(90, 0, 0).Translate(pos);
             var axisHelper = cyl1.Union(cyl2, cyl3).Color("Red");
 
-            string script = cube.Union(axisHelper).ToString();
+            string script = obj.Union(axisHelper).ToString();
 
             File.WriteAllLines("test.scad", new string[] { script.ToString() });
             //Console.ReadKey();

OSCADSharp/OSCADSharp.UnitTests/CylinderTests.cs

@@ -23,5 +23,21 @@ namespace OSCADSharp.UnitTests
             Assert.IsTrue(script.Contains("h = 12.1"));
             Assert.IsTrue(script.Contains("center = true"));
         }
+
+        [TestMethod]
+        public void Cylinder_UncenteredPositionZValueIsHalfTheHeight()
+        {
+            var cylinder = new Cylinder(3, 40);
+
+            Assert.AreEqual(new Vector3(0, 0, 20), cylinder.Position());
+        }
+
+        [TestMethod]
+        public void Cylinder_CenteredCylinderPositionIsZero()
+        {
+            var cylinder = new Cylinder(5, 20, true);
+
+            Assert.AreEqual(new Vector3(), cylinder.Position());
+        }
     }
 }

OSCADSharp/OSCADSharp.UnitTests/OSCADSharp.UnitTests.csproj

@@ -59,6 +59,7 @@
     <Compile Include="OSCADObjectTests.cs" />
     <Compile Include="SphereTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Text3DTests.cs" />
     <Compile Include="UnionTests.cs" />
   </ItemGroup>
   <ItemGroup>

OSCADSharp/OSCADSharp.UnitTests/SphereTests.cs

@@ -69,5 +69,13 @@ namespace OSCADSharp.UnitTests
 
             Assert.IsTrue(sphere.IsSameAs(clone));
         }
+
+        [TestMethod]
+        public void Sphere_PositionIsAtZero()
+        {
+            var sphere = new Sphere();
+
+            Assert.AreEqual(new Vector3(), sphere.Position());
+        }
     }
 }

OSCADSharp/OSCADSharp.UnitTests/Text3DTests.cs

@@ -0,0 +1,22 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using OSCADSharp.Solids;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OSCADSharp.UnitTests
+{
+    [TestClass]
+    public class Text3DTests
+    {
+        [TestMethod]
+        public void Text_PositionIsCentered()
+        {
+            var text = new Text3D("Bom chicka bow wow");
+
+            Assert.AreEqual(new Vector3(), text.Position());
+        }
+    }
+}

OSCADSharp/OSCADSharp/Solids/Cylinder.cs

@@ -140,7 +140,17 @@ namespace OSCADSharp.Solids
 
         public override Vector3 Position()
         {
-            throw new NotImplementedException();
+            Vector3 position;
+            if (this.Center == false)
+            {
+                position = new Vector3(0, 0, this.Height / 2);
+            }
+            else
+            {
+                position = new Vector3();
+            }
+
+            return position;
         }
         #endregion
     }

OSCADSharp/OSCADSharp/Solids/Sphere.cs

@@ -83,7 +83,7 @@ namespace OSCADSharp.Solids
 
         public override Vector3 Position()
         {
-            throw new NotImplementedException();
+            return new Vector3();
         }
         #endregion
     }

OSCADSharp/OSCADSharp/Solids/Text3D.cs

@@ -116,6 +116,11 @@ namespace OSCADSharp.Solids
             sb.Append("\"");
 
             appendIfValueNotNullOrEmpty("size", this.Size?.ToString(), sb);
+            // Text is always centered in OSCADSharp to ensure correctness of
+            // position interpolation
+            appendIfValueNotNullOrEmpty("halign", "\"center\"", sb);
+            appendIfValueNotNullOrEmpty("valign", "\"center\"", sb);
+
             appendIfValueNotNullOrEmpty("font", this.Font, sb);
             appendIfValueNotNullOrEmpty("spacing", this.Spacing?.ToString(), sb);
             appendIfValueNotNullOrEmpty("direction", this.TextDirection?.ToString(), sb);
@@ -127,9 +132,16 @@ namespace OSCADSharp.Solids
             return formatter.ToString();
         }
 
+        /// <summary>
+        /// In reaction to the need for this value to be correct, halign and valign will always
+        /// be "center" by default, since non-centered text would vary dramatically in position based upon
+        /// the font of the text
+        /// - MLS 2/15/2016
+        /// </summary>
+        /// <returns></returns>
         public override Vector3 Position()
         {
-            throw new NotImplementedException();
+            return new Vector3();
         }
         #endregion
     }