Merge from branch giga

StgSharp.Model/Step/Items/StepPlacement.cs

@@ -28,15 +28,47 @@
 //     
 //-----------------------------------------------------------------------
 //-----------------------------------------------------------------------
+using StgSharp.Model.Step;
 using StgSharp.Script;
 using StgSharp.Script.Express;
 
-namespace StgSharp.Modeling.Items
+using System;
+
+namespace StgSharp.Model.Step
 {
-    public abstract class StepPlacement : StepGeometricRepresentationItem
+    public class StepPlacement : StepGeometricRepresentationItem, IExpConvertableFrom<StepPlacement>
     {
 
-        protected StepPlacement( string name ) : base( name ) { }
+        private StepCartesianPoint _location;
+
+        public StepPlacement( StepModel model ) : base( model ) { }
+
+        public StepPlacement( StepModel model, StepCartesianPoint location )
+            : base( model )
+        {
+            _location = location;
+        }
+
+        public StepCartesianPoint Location
+        {
+            get { return _location; }
+            set
+            {
+                ArgumentNullException.ThrowIfNull( value );
+                _location = value;
+            }
+        }
+
+        public void FromInstance( StepPlacement entity )
+        {
+            base.FromInstance( entity );
+            this.Location = entity.Location;
+        }
+
+        public override bool IsConvertableTo( string entityName )
+        {
+            return base.IsConvertableTo( entityName ) || entityName == "StepPlacement";
+        }
 
     }
 }