Make Body inherit Item

Previously Body was a root class and all subclasses of Body inherited both
Item and Body. This seemed strange.

stepcore/CLASSES

@@ -30,7 +30,7 @@ Legend
          * GslSolver
          * GslAdaptiveSolver
 
-   * Item{world.h}		Root class for world items (bodies, forces)
+   * Item{item.h}		Root class for world items (bodies, forces)
      [world, group, objectErrors, color]
 
       * NoteImage		Image embedded in a Note
@@ -42,17 +42,18 @@ Legend
 	 * World		The root object for everything visible
 	   [time, timeScale, bodies, forces, joints, solvers...]
 
-* Body{world.h}			Anything that has dynamic variables that 
+      * Body{body.h}			Anything that has dynamic variables that 
 				require ODE integration
-   * Particle(Item, Body)
-      * ChargedParticle
-      * GasParticle
-   * RigidBody(Item, Body)
-      * Disk
-      * BasePolygon
-         * Box
-         * Polygon
-   * Plane(Item, Body)		Unmovable rigid plane
+         * Particle(Item, Body)
+            * ChargedParticle
+            * GasParticle
+         * RigidBody(Item, Body)
+            * Disk
+            * BasePolygon
+               * Box
+               * Polygon
+         * Plane(Item, Body)		Unmovable rigid plane
+
 
 * Force{world.h}		Anything that acts upon bodies changing 
 				derivatives of dynamic variables

stepcore/body.h

@@ -28,31 +28,27 @@
 #include <vector> // XXX: Replace if Qt is enabled.
 
 #include "types.h"
-#include "object.h"
+#include "item.h"
 
 
 namespace StepCore
 {
 
-//class World;
-//class Solver;
-//class Item;
-//class ItemGroup;
-//class CollisionSolver;
-//class ConstraintSolver;
-
 
 /** \ingroup bodies
  *  \brief Interface for bodies
  *
  *  Body is anything that has dynamic variables that require ODE integration
  */
-class Body
+class Body : public Item
 {
     STEPCORE_OBJECT(Body)
 
 public:
-    Body(): _variablesOffset(0) {}
+    Body(const QString& name = QString())
+        : Item(name)
+	, _variablesOffset(0)
+    {}
     virtual ~Body() {}
 
     /** Get count of dynamic variables (not including velocities) */

stepcore/particle.h

@@ -100,7 +100,7 @@ protected:
 /** \ingroup bodies
  *  \brief Particle with mass
  */
-class Particle: public Item, public Body
+class Particle: public Body
 {
     STEPCORE_OBJECT(Particle)
 

stepcore/rigidbody.h

@@ -141,7 +141,7 @@ protected:
 /** \ingroup bodies
  *  \brief Rigid body
  */
-class RigidBody: public Item, public Body
+class RigidBody: public Body
 {
     STEPCORE_OBJECT(RigidBody)
 
@@ -358,7 +358,7 @@ public:
 /** \ingroup bodies
  *  \brief Unmovable rigid plane
  */
-class Plane: public Item, public Body
+class Plane: public Body
 {
     STEPCORE_OBJECT(Plane)
 

stepcore_tests/worldcopy.cc

@@ -21,8 +21,7 @@
 #include <stepcore/solver.h>
 #include <stepcore/types.h>
 
-class WorldCopyTestItem: public StepCore::Item,
-                         public StepCore::Body,
+class WorldCopyTestItem: public StepCore::Body,
                          public StepCore::Force
 {
     STEPCORE_OBJECT(WorldCopyTestItem)