topic Can Archicad Api control visibility of one Element? in Archicad C++ API

Can Archicad Api control visibility of one Element?

Anonymous — Thu, 29 Sep 2022 07:59:01 GMT

Hi.
Is there any method to control the visibility of one element by Archicad Api？

Re: Can ArchiCad Api control visibility of one Element?

Tibor Lorantfy — Tue, 12 Nov 2019 15:58:38 GMT

Hi,

Yes.
For example if you move the element to an invisible layer, that way the element will become invisible. If your element is on an invisible layer, then you can move it to a visible layer to make the element visible also:

GS::Array<API_Guid> walls;
ACAPI_Element_GetElemList (API_WallID, &walls);

const API_AttributeIndex hiddenLayerIndex = GetIndexOfHiddenNotLockedLayer ();

if (walls.GetSize () > 0 && hiddenLayerIndex > 0) {
	ACAPI_CallUndoableCommand (GS::UniString ("Move walls to an invisible layer"), [&] () -> GSErrCode {
		API_Element newParameters = {};
		API_Element newParametersMask = {};

		newParameters.header.layer = hiddenLayerIndex;
		ACAPI_ELEMENT_MASK_SET (newParametersMask, API_Elem_Head, layer);

		return ACAPI_Element_ChangeMore (walls, &newParameters, nullptr, &newParametersMask, 0, true);
	});
}

//------------------------------------------------------

static API_AttributeIndex GetIndexOfHiddenNotLockedLayer ()
{
	API_AttributeIndex	count;
	ACAPI_Attribute_GetNum (API_LayerID, &count);

	for (API_AttributeIndex ii = 1; ii <= count; ++ii) {
		API_Attribute attr = {};
		attr.header.typeID = API_LayerID;
		attr.header.index = ii;
		if (ACAPI_Attribute_Get (&attr) == NoError) {
			const bool isHidden = (attr.layer.head.flags & APILay_Hidden) != 0;
			const bool isLocked = (attr.layer.head.flags & APILay_Locked) != 0;
			if (isHidden && !isLocked)
				return attr.header.index;
		}
	}

	return -1;
}

Please note, that if you want to highlight elements in 3D, then you can use APIIo_HighlightElementsID method. That function highlights the given elements with the given color and the other (non-highlighted) elements can be switched to wireframed mode:

GS::Array<API_Guid> walls;
ACAPI_Element_GetElemList (API_WallID, &walls);

if (walls.GetSize () > 0) {
	GS::HashTable<API_Guid, API_RGBAColor>	highlightedElements;
	API_RGBAColor	highlightColor = { 0.0, 0.5, 0.75, 0.5 };
	for (const API_Guid& wallGuid : walls) {
		highlightedElements.Add (wallGuid, highlightColor);
		highlightColor.f_red += 0.2;
		if (highlightColor.f_red > 1.0)
			highlightColor.f_red = 0.0;
	}

	bool showNotHighlightedElementsWithWireframe = true;
	ACAPI_Interface (APIIo_HighlightElementsID, &highlightedElements, &showNotHighlightedElementsWithWireframe);
}

You can switch off the highlight with the following line:

ACAPI_Interface (APIIo_HighlightElementsID);

Regards,
Tibor

Re: Can ArchiCad Api control visibility of one Element?

Anonymous — Thu, 14 Nov 2019 03:41:09 GMT

Tibor wrote:
Hi,

Yes.
For example if you move the element to an invisible layer, that way the element will become invisible. If your element is on an invisible layer, then you can move it to a visible layer to make the element visible also:

GS::Array<API_Guid> walls;
ACAPI_Element_GetElemList (API_WallID, &walls);

const API_AttributeIndex hiddenLayerIndex = GetIndexOfHiddenNotLockedLayer ();

if (walls.GetSize () > 0 && hiddenLayerIndex > 0) {
	ACAPI_CallUndoableCommand (GS::UniString ("Move walls to an invisible layer"), [&] () -> GSErrCode {
		API_Element newParameters = {};
		API_Element newParametersMask = {};

		newParameters.header.layer = hiddenLayerIndex;
		ACAPI_ELEMENT_MASK_SET (newParametersMask, API_Elem_Head, layer);

		return ACAPI_Element_ChangeMore (walls, &newParameters, nullptr, &newParametersMask, 0, true);
	});
}

//------------------------------------------------------

static API_AttributeIndex GetIndexOfHiddenNotLockedLayer ()
{
	API_AttributeIndex	count;
	ACAPI_Attribute_GetNum (API_LayerID, &count);

	for (API_AttributeIndex ii = 1; ii <= count; ++ii) {
		API_Attribute attr = {};
		attr.header.typeID = API_LayerID;
		attr.header.index = ii;
		if (ACAPI_Attribute_Get (&attr) == NoError) {
			const bool isHidden = (attr.layer.head.flags & APILay_Hidden) != 0;
			const bool isLocked = (attr.layer.head.flags & APILay_Locked) != 0;
			if (isHidden && !isLocked)
				return attr.header.index;
		}
	}

	return -1;
}

GS::Array<API_Guid> walls;
ACAPI_Element_GetElemList (API_WallID, &walls);

if (walls.GetSize () > 0) {
	GS::HashTable<API_Guid, API_RGBAColor>	highlightedElements;
	API_RGBAColor	highlightColor = { 0.0, 0.5, 0.75, 0.5 };
	for (const API_Guid& wallGuid : walls) {
		highlightedElements.Add (wallGuid, highlightColor);
		highlightColor.f_red += 0.2;
		if (highlightColor.f_red > 1.0)
			highlightColor.f_red = 0.0;
	}

	bool showNotHighlightedElementsWithWireframe = true;
	ACAPI_Interface (APIIo_HighlightElementsID, &highlightedElements, &showNotHighlightedElementsWithWireframe);
}

You can switch off the highlight with the following line:

ACAPI_Interface (APIIo_HighlightElementsID);

Regards,
Tibor

Thank you very much.