Added a sphere constructor that takes variables to pre-bind internal values

OSCADSharp/OSCADSharp.UnitTests/Solids/SphereTests.cs

@@ -166,5 +166,22 @@ namespace OSCADSharp.UnitTests
             Assert.IsTrue(script.Contains("$fa = angle"));
             Assert.IsTrue(script.Contains("$fs = fragSize"));
         }
+
+        [TestMethod]
+        public void Sphere_CanCreateSphereWithBindingsFromConstructor()
+        {
+            var diam = new Variable("width", Sizes.OneInch);
+            var resolution = new Variable("rez", 100);
+
+            var sphere = new Sphere(diam, resolution);
+
+            Assert.AreEqual(diam.Value, sphere.Diameter);
+            Assert.AreEqual(resolution.Value, sphere.Resolution);
+
+            string script = sphere.ToString();
+
+            Assert.IsTrue(script.Contains("d = width"));
+            Assert.IsTrue(script.Contains("$fn = rez"));
+        }
     }
 }

OSCADSharp/OSCADSharp/Solids/Sphere.cs

@@ -65,6 +65,25 @@ namespace OSCADSharp.Solids
         {
             this.Diameter = diameter;
         }
+
+        /// <summary>
+        /// Creates a sphere with one more more pre-bound properties
+        /// </summary>
+        /// <param name="diameter"></param>
+        /// <param name="resolution"></param>
+        /// <param name="minimumAngle"></param>
+        /// <param name="minimumFragmentSize"></param>
+        public Sphere(Variable diameter = null, Variable resolution = null, Variable minimumAngle = null, Variable minimumFragmentSize = null)
+        {
+            if (diameter != null)
+                this.Bind("diameter", diameter);
+            if (resolution != null)
+                this.Bind("resolution", resolution);
+            if (minimumAngle != null)
+                this.Bind("minimumangle", minimumAngle);
+            if (minimumFragmentSize != null)
+                this.Bind("minimumfragmentsize", minimumFragmentSize);
+        }
         #endregion
 
         #region Overrides