+ Reworked Sphere to use StatementBuilder as well to conditionally output $f* values

OSCADSharp/OSCADSharp.ConsoleTests/Program.cs

@@ -14,7 +14,7 @@ namespace OSCADSharp.ConsoleTests
         static void Main(string[] args)
         {
 
-            var obj = new Text3D("Whaat is thissss?");
+            var obj = new Sphere(30);
 
             var pos = obj.Position();
             var cyl1 = new Cylinder(1, 100, true).Translate(pos);

OSCADSharp/OSCADSharp.UnitTests/Solids/SphereTests.cs

@@ -86,5 +86,34 @@ namespace OSCADSharp.UnitTests
             Assert.AreEqual(new Vector3(15, 15, 15), obj.Bounds().TopRight);
             Assert.AreEqual(new Vector3(-15, -15, -15), obj.Bounds().BottomLeft);
         }
+
+        [TestMethod]
+        public void Sphere_ScriptOutputDoesNotContainResolutionValuesIfNotSpecified()
+        {
+            var sphere = new Sphere();
+
+            string script = sphere.ToString();
+
+            Assert.IsTrue(!script.Contains("$fn"));
+            Assert.IsTrue(!script.Contains("$fa"));
+            Assert.IsTrue(!script.Contains("$fs"));
+        }
+
+        [TestMethod]
+        public void Sphere_ScriptOutpuHasResolutionValuesIfSpecified()
+        {
+            var sphere = new Sphere()
+            {
+                Resolution = 40,
+                MinimumAngle = 5,
+                MinimumFragmentSize = 2
+            };
+
+            string script = sphere.ToString();
+
+            Assert.IsTrue(script.Contains("$fn"));
+            Assert.IsTrue(script.Contains("$fa"));
+            Assert.IsTrue(script.Contains("$fs"));
+        }
     }
 }

OSCADSharp/OSCADSharp/Solids/Sphere.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using OSCADSharp.Spatial;
+using OSCADSharp.Scripting;
 
 namespace OSCADSharp.Solids
 {
@@ -30,19 +31,19 @@ namespace OSCADSharp.Solids
         /// Minimum angle (in degrees) of each cylinder fragment.
         /// ($fa in OpenSCAD)
         /// </summary>
-        public int MinimumAngle { get; set; } = 12;
+        public int? MinimumAngle { get; set; }
 
         /// <summary>
         /// Fragment size in mm
         /// ($fs in OpenSCAD)
         /// </summary>
-        public int MinimumFragmentSize { get; set; } = 2;
+        public int? MinimumFragmentSize { get; set; }
 
         /// <summary>
         /// Number of fragments in 360 degrees. Values of 3 or more override MinimumAngle and MinimumCircumferentialLength
         /// ($fn in OpenSCAD)
         /// </summary>
-        public int Resolution { get; set; } = 0;
+        public int? Resolution { get; set; }
         #endregion
 
         #region Constructors
@@ -70,9 +71,16 @@ namespace OSCADSharp.Solids
         /// <returns>Script for this object</returns>
         public override string ToString()
         {
-            return String.Format("sphere($fn = {0}, $fa = {1}, $fs = {2}, r = {3});{4}", 
-                this.Resolution.ToString(), this.MinimumAngle.ToString(), 
-                this.MinimumFragmentSize.ToString(), this.Radius.ToString(), Environment.NewLine);
+            StatementBuilder sb = new StatementBuilder();
+            sb.Append("sphere(");
+            sb.AppendValuePairIfExists("r", this.Radius);
+            sb.AppendValuePairIfExists("$fn", this.Resolution, true);
+            sb.AppendValuePairIfExists("$fa", this.MinimumAngle, true);
+            sb.AppendValuePairIfExists("$fs", this.MinimumFragmentSize, true);
+            sb.Append(");");
+            sb.Append(Environment.NewLine);
+
+            return sb.ToString();
         }
 
         /// <summary>