Multi-Objects: CURVE_OT_select_similar

Implemented the following methods:
* SIMCURHAND_TYPE
* SIMCURHAND_RADIUS
* SIMCURHAND_WEIGHT
* SIMCURHAND_DIRECTION

Limits:
* DIRECTION does not support surfaces, because `BKE_nurb_bpoint_calc_normal`
  does not work with Nurbs of type `CU_CARDINAL`. This also didn't work prior
  to this patch, so we wait until surfaces are properly supported in EditMode.

* Also DIRECTION should take scaling into consideration. We need our own
  versions of BKE_nurb_bpoint_calc_normal/bezt.

* Threshold default is too large. Not sure if it's better to change the default
  or scale the threshold in code.

Differential Revision: https://developer.blender.org/D3846

Changes from committer (Dalai Felinto):
 * Moved nurb_bpoint_direction_worldspace_get/bezt to functions.
 * Comments hinting at the mode (direction) that require scaling to be
   taken into account - to be addressed by patch creator in a future
   patch.

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_curve.h b/source/blender/editors/include/ED_curve.h
index 5133fb46dc7..e4eea9921db 100644
--- a/source/blender/editors/include/ED_curve.h
+++ b/source/blender/editors/include/ED_curve.h
@@ -74,6 +74,7 @@ void ED_curve_deselect_all(struct EditNurb *editnurb);
 void ED_curve_deselect_all_multi(struct Object **objects, int objects_len);
 void ED_curve_select_all(struct EditNurb *editnurb);
 void ED_curve_select_swap(struct EditNurb *editnurb, bool hide_handles);
+int ED_curve_select_count(struct View3D *v3d, struct EditNurb *editnurb);
 
 /* editcurve_undo.c */
 void ED_curve_undosys_type(struct UndoType *ut);