== Armature Centering Tools ==

After all these years, it is now possible to (re)center armatures like you
can do with meshes and curves.

At the moment, you can only access this functionality from the menus
(Spacebar->Transform) as the armature button panels are pretty
crowded.

source/blender/include/BIF_editarmature.h

@@ -75,6 +75,7 @@ void	adduplicate_armature(void);
 void	addvert_armature(void);
 void	add_primitiveArmature(int type);
 void	apply_rot_armature (struct Object *ob, float mat[3][3]);
+void 	docentre_armature (struct Object *ob, int centremode);
 
 void	clear_armature(struct Object *ob, char mode);
 

source/blender/src/editarmature.c

@@ -365,6 +365,67 @@ void apply_rot_armature (Object *ob, float mat[3][3])
 	}
 }
 
+/* 0 == do centre, 1 == centre new, 2 == centre cursor */
+void docentre_armature (Object *ob, int centremode)
+{
+	ListBase	list;
+	EditBone *ebone;
+	bArmature *arm;
+	float cent[3] = {0.0f, 0.0f, 0.0f};
+	float min[3], max[3];
+	float omat[3][3];
+		
+	arm = get_armature(ob);
+	if (!arm) return;
+
+	/* Put the armature into editmode */
+	list.first= list.last = NULL;
+	make_boneList(&list, &arm->bonebase, NULL);
+
+	/* Find the centrepoint */
+	if (centremode == 2) {
+		VECCOPY(cent, give_cursor());
+		Mat4Invert(ob->imat, ob->obmat);
+		Mat4MulVecfl(ob->imat, cent);
+	}
+	else {
+		INIT_MINMAX(min, max);
+		
+		for (ebone= list.first; ebone; ebone=ebone->next) {
+			DO_MINMAX(ebone->head, min, max);
+			DO_MINMAX(ebone->tail, min, max);
+		}
+		
+		cent[0]= (min[0]+max[0])/2.0f;
+		cent[1]= (min[1]+max[1])/2.0f;
+		cent[2]= (min[2]+max[2])/2.0f;
+	}
+	
+	/* Do the adjustments */
+	for (ebone= list.first; ebone; ebone=ebone->next){
+		VecSubf(ebone->head, ebone->head, cent);
+		VecSubf(ebone->tail, ebone->tail, cent);
+	}
+	
+	/* Turn the list into an armature */
+	editbones_to_armature(&list, ob);
+	
+	/* Free the editbones */
+	if (list.first){
+		BLI_freelistN(&list);
+	}
+	
+	/* Adjust object location for new centrepoint */
+	if(centremode && G.obedit==0) {
+		Mat3CpyMat4(omat, ob->obmat);
+		
+		Mat3MulVecfl(omat, cent);
+		ob->loc[0]+= cent[0];
+		ob->loc[1]+= cent[1];
+		ob->loc[2]+= cent[2];
+	}
+}
+
 int join_armature(void)
 {
 	Object	*ob;

source/blender/src/editobject.c

@@ -1998,6 +1998,22 @@ void docentre(int centremode)
 
 					allqueue(REDRAWBUTSEDIT, 0);
 				}
+				else if(base->object->type==OB_ARMATURE) {
+					bArmature *arm = base->object->data;
+					
+					if(arm->id.us>1) {
+						error("Can't apply to a multi user armature");
+						return;
+					}
+					
+					/* Function to recenter armatures in editarmature.c 
+					 * Bone + object locations are handled there.
+					 */
+					docentre_armature(base->object, centremode);
+					
+					if(G.obedit) 
+						break;
+				}
 				base->object->recalc= OB_RECALC_OB|OB_RECALC_DATA;
 			}
 		}