Fix #29253: 3D Manipulator: "Active Element" not supported for curves

This funcitonality simply wasn't implemented for curves yet, implemented it now.

source/blender/editors/curve/editcurve.c

@@ -5468,6 +5468,24 @@ static int point_on_nurb(Nurb *nu, void *point)
 	}
 }
 
+static Nurb *get_lastsel_nurb(Curve *cu)
+{
+	ListBase *nubase= curve_editnurbs(cu);
+	Nurb *nu= nubase->first;
+
+	if(!cu->lastsel)
+		return NULL;
+
+	while (nu) {
+		if (point_on_nurb(nu, cu->lastsel))
+			return nu;
+
+		nu= nu->next;
+	}
+
+	return NULL;
+}
+
 static void select_nth_bezt(Nurb *nu, BezTriple *bezt, int nth)
 {
 	int a, start;
@@ -5517,21 +5535,11 @@ static void select_nth_bp(Nurb *nu, BPoint *bp, int nth)
 int CU_select_nth(Object *obedit, int nth)
 {
 	Curve *cu= (Curve*)obedit->data;
-	ListBase *nubase= curve_editnurbs(cu);
 	Nurb *nu;
-	int ok=0;
 
-	/* Search nurb to which selected point belongs to */
-	nu= nubase->first;
-	while (nu) {
-		if (point_on_nurb(nu, cu->lastsel)) {
-			ok= 1;
-			break;
-		}
-		nu= nu->next;
-	}
-
-	if (!ok) return 0;
+	nu= get_lastsel_nurb(cu);
+	if (!nu)
+		return 0;
 
 	if (nu->bezt) {
 		select_nth_bezt(nu, cu->lastsel, nth);
@@ -7070,3 +7078,24 @@ void ED_curve_bpcpy(EditNurb *editnurb, BPoint *dst, BPoint *src, int count)
 	memcpy(dst, src, count*sizeof(BPoint));
 	keyIndex_updateBP(editnurb, src, dst, count);
 }
+
+int ED_curve_actSelection(Curve *cu, float center[3])
+{
+	Nurb *nu= get_lastsel_nurb(cu);
+
+	if(!nu)
+		return 0;
+
+	if(nu->bezt) {
+		BezTriple *bezt= cu->lastsel;
+
+		copy_v3_v3(center, bezt->vec[1]);
+	}
+	else {
+		BPoint *bp= cu->lastsel;
+
+		copy_v3_v3(center, bp->vec);
+	}
+
+	return 1;
+}

source/blender/editors/include/ED_curve.h

@@ -89,6 +89,8 @@ void ED_curve_bpcpy(struct EditNurb *editnurb, struct BPoint *dst, struct BPoint
 
 int ED_curve_updateAnimPaths(struct Object *obedit);
 
+int ED_curve_actSelection(struct Curve *cu, float center[3]);
+
 /* debug only */
 void printknots(struct Object *obedit);
 

source/blender/editors/transform/transform_generics.c

@@ -1548,14 +1548,26 @@ void calculateCenter(TransInfo *t)
 		
 		/* EDIT MODE ACTIVE EDITMODE ELEMENT */
 
-		if (t->obedit && t->obedit->type == OB_MESH) {
-			EditSelection ese;
-			EditMesh *em = BKE_mesh_get_editmesh(t->obedit->data);
+		if (t->obedit) {
+			if(t->obedit->type == OB_MESH) {
+				EditSelection ese;
+				EditMesh *em = BKE_mesh_get_editmesh(t->obedit->data);
 			
-			if (EM_get_actSelection(em, &ese)) {
-				EM_editselection_center(t->center, &ese);
-				calculateCenter2D(t);
-				break;
+				if (EM_get_actSelection(em, &ese)) {
+					EM_editselection_center(t->center, &ese);
+					calculateCenter2D(t);
+					break;
+				}
+			}
+			else if (ELEM(t->obedit->type, OB_CURVE, OB_SURF)) {
+				float center[3];
+				Curve *cu= (Curve *)t->obedit->data;
+
+				if (ED_curve_actSelection(cu, center)) {
+					copy_v3_v3(t->center, center);
+					calculateCenter2D(t);
+					break;
+				}
 			}
 		} /* END EDIT MODE ACTIVE ELEMENT */
 		

source/blender/editors/transform/transform_manipulator.c

@@ -71,6 +71,7 @@
 #include "WM_types.h"
 
 #include "ED_armature.h"
+#include "ED_curve.h"
 #include "ED_mesh.h"
 #include "ED_particle.h"
 #include "ED_view3d.h"
@@ -390,56 +391,64 @@ int calc_manipulator_stats(const bContext *C)
 		}
 		else if ELEM(obedit->type, OB_CURVE, OB_SURF) {
 			Curve *cu= obedit->data;
-			Nurb *nu;
-			BezTriple *bezt;
-			BPoint *bp;
-			ListBase *nurbs= curve_editnurbs(cu);
+			float center[3];
 
-			nu= nurbs->first;
-			while(nu) {
-				if(nu->type == CU_BEZIER) {
-					bezt= nu->bezt;
-					a= nu->pntsu;
-					while(a--) {
-						/* exceptions
-						 * if handles are hidden then only check the center points.
-						 * If the center knot is selected then only use this as the center point.
-						 */
-						if (cu->drawflag & CU_HIDE_HANDLES) {
-							if (bezt->f2 & SELECT) {
+			if (v3d->around==V3D_ACTIVE && ED_curve_actSelection(cu, center)) {
+			calc_tw_center(scene, center);
+				totsel++;
+			}
+			else {
+				Nurb *nu;
+				BezTriple *bezt;
+				BPoint *bp;
+				ListBase *nurbs= curve_editnurbs(cu);
+
+				nu= nurbs->first;
+				while(nu) {
+					if(nu->type == CU_BEZIER) {
+						bezt= nu->bezt;
+						a= nu->pntsu;
+						while(a--) {
+							/* exceptions
+							 * if handles are hidden then only check the center points.
+							 * If the center knot is selected then only use this as the center point.
+							 */
+							if (cu->drawflag & CU_HIDE_HANDLES) {
+								if (bezt->f2 & SELECT) {
+									calc_tw_center(scene, bezt->vec[1]);
+									totsel++;
+								}
+							}
+							else if (bezt->f2 & SELECT) {
 								calc_tw_center(scene, bezt->vec[1]);
 								totsel++;
 							}
+							else {
+								if(bezt->f1) {
+									calc_tw_center(scene, bezt->vec[0]);
+									totsel++;
+								}
+								if(bezt->f3) {
+									calc_tw_center(scene, bezt->vec[2]);
+									totsel++;
+								}
+							}
+							bezt++;
 						}
-						else if (bezt->f2 & SELECT) {
-							calc_tw_center(scene, bezt->vec[1]);
-							totsel++;
-						}
-						else {
-							if(bezt->f1) {
-								calc_tw_center(scene, bezt->vec[0]);
-								totsel++;
-							}
-							if(bezt->f3) {
-								calc_tw_center(scene, bezt->vec[2]);
+					}
+					else {
+						bp= nu->bp;
+						a= nu->pntsu*nu->pntsv;
+						while(a--) {
+							if(bp->f1 & SELECT) {
+								calc_tw_center(scene, bp->vec);
 								totsel++;
 							}
+							bp++;
 						}
-						bezt++;
 					}
+					nu= nu->next;
 				}
-				else {
-					bp= nu->bp;
-					a= nu->pntsu*nu->pntsv;
-					while(a--) {
-						if(bp->f1 & SELECT) {
-							calc_tw_center(scene, bp->vec);
-							totsel++;
-						}
-						bp++;
-					}
-				}
-				nu= nu->next;
 			}
 		}
 		else if(obedit->type==OB_MBALL) {