How to read/edit/change/copy neig for drawings or the equivalent sub-elements identified by neig?

AllanP — Thu, 28 Aug 2025 11:14:34 GMT

Working in Archicad 25

I am creating new drawings on a layout based on an old drawing on a layout, but with a different navigator item.

(in the example i just linked it to a different view map item of the same detail to see what isn't/is copied)

newElement.header.typeID = API_DrawingID; newElement = oldElement; newElement.drawing.drawingGuid = newNavItem.guid; API_ElementMemo memo; BNZeroMemory(&memo, sizeof(API_ElementMemo)); err = ACAPI_Element_GetMemo(oldGuid, &memo, APIMemoMask_DrawingData); err = ACAPI_Element_Create(&newElement, &memo); ACAPI_DisposeElemMemoHdls(&memo);

the neig items/equivalent sub-element of the new drawing are different from the old drawing.

(P.S. the neig definition images are missing from the online documentation for Archicad 28, so no-one can tell what they refer to unless you have old copies of the developer documentation)

Missing images

How do i copy Nieg settings or equivalent sub-element from one drawing and apply them to another drawing

The ElementHead_To_Neig only sets the NeigID to APINeig_DrawingCenter

How do i access/change/update the APINeig_DrawingTitle[3] field or the equivalent sub-element setting for the position of the drawing title?

The only example i have been able to find that even mentions the neig, but doesn't try to change any of the sub-element related to the neig equivalent sub-element.

Is this just not possible to move the drawing title, or even get the drawing title location from another drawing?

/*----------------------------------------------------------** ** Insert a new node into the clicked poly edge ** **----------------------------------------------------------*/ static void Do_Poly_InsertNode(void) { API_ElementMemo memo; API_Neig neig; API_ElemTypeID idElem; API_Coord3D begC; API_EdgeTrim edgeTrim; Int32 nodeInd; GSErrCode err; if (!ClickAnElem("Click an edge to insert new node", API_ZombieElemID, &neig, nullptr, nullptr, &begC)) { GiveMessage("Please click a polygon node", true); return; } if (neig.neigID != APINeig_CeilOn && neig.neigID != APINeig_RoofOn) { GiveMessage("Please click a ceil or roof edge", true); return; } idElem = Neig_To_ElemID(neig.neigID); err = ACAPI_Element_GetMemo(neig.guid, &memo); if (err) { GiveMessage_Err("ACAPI_Element_GetMemo", err); return; } nodeInd = neig.inIndex + 1; err = ACAPI_Goodies(APIAny_InsertPolyNodeID, &memo, &nodeInd, (API_Coord*)(&begC)); if (!err) { switch (idElem) { case API_SlabID: //* nothing to do break; case API_RoofID: if (memo.edgeTrims != nullptr && *memo.edgeTrims != nullptr) { //* insert edgeTrim rec; [neig.inIndex] } break; default: return; //* never got there } err = ACAPI_Element_ChangeMemo(neig.guid, APIMemoMask_Polygon, &memo); if (err) GiveMessage_Err("ACAPI_Element_ChangeMemo", err); } else GiveMessage_Err("APIAny_InsertPolyNodeID", err); ACAPI_DisposeElemMemoHdls(&memo); return; }

Re: How to read/edit/change/copy neig for drawings or the equivalent sub-elements identified by neig

Hiromichi Shinkawa — Wed, 10 Sep 2025 05:33:57 GMT

Hi, I'd suggest you to modify two places of your code for dealing with drawing local placement issue:

err = ACAPI_Element_GetMemo(oldGuid, &memo, APIMemoMask_Polygon); // only need polygon info.

After created a new drawing element, force to change pos:

API_Element mask; ACAPI_ELEMENT_MASK_CLEAR(mask); ACAPI_ELEMENT_MASK_SET(mask, API_DrawingType, pos); newElement.drawing.pos = element.drawing.pos; err = ACAPI_Element_Change (&newElement, &mask, nullptr, 0, true);

Also, you can change newElement.drawing.name parameter for drawing title.

(Sorry I didn't check AC25, it should work on latest version)

HTH.

topic Re: How to read/edit/change/copy neig for drawings or the equivalent sub-elements identified by neig in Archicad C++ API

How to read/edit/change/copy neig for drawings or the equivalent sub-elements identified by neig?

Re: How to read/edit/change/copy neig for drawings or the equivalent sub-elements identified by neig