Skip to content

Latest commit

 

History

History
73 lines (57 loc) · 1.64 KB

BeginGroupN.md

File metadata and controls

73 lines (57 loc) · 1.64 KB

BeginGroupN

Description

May be used to create objects in an existing group by passing a group handle; if a handle initialized to NIL is passed a new group is created.

PROCEDURE BeginGroupN(VAR groupHandle : HANDLE);
def vs.BeginGroupN(groupHandle):
    return groupHandle

Parameters

Name Type Description
groupHandle HANDLE The group handle to be used; if handle is initialized to NIL a new group is created.

Remarks

_c_ 2021.02.24:

Be very careful with BeginGroupN, this won't automatically return NIL if empty. Used in Plug-in object it will crash VW upon attempting to use the common Group operation routines and the Group handle is not valid (Tested up to VW 2021 SP3).

gr1 := NIL;
BeginGroupN(gr1);
EndGroup;
{ gr1 now unexpectedly is not NIL }
		
BeginGroup;
EndGroup;
gr2 := LNewObj;
{ this is NIL }

{ 
 IF gr1 <> NIL THEN
 	killer := CreateDuplicateObject(gr1, NIL); this hangs VW in pios }
		
{ 
IF gr1 <> NIL THEN
	killer := FInGroup(gr1); this causes VW to instantly quit in pios }

{ solution: make sure that the handle is valid adding some basic geometry that you might delete later }
BeginGroupN(gr1);
Locus(0, 0);
EndGroup;

Examples

BeginGroupN(groupHandle);
  Rect(-1,1,0.5,0);
EndGroup;
{ adds created rect to existing group }

groupHandle := nil;
BeginGroupN(groupHandle);
  Rect(-1,1,0.5,0);
EndGroup;
{ creates new group and adds created rect to created group }

See Also

VS Functions: BeginGroup | EndGroup

Version

Availability: from Vectorworks 2011

Category