CRhinoOnTransformObject sample in C++

Rhino Developer
1

Hi;

Can anyone give me an example of how to use CRhinoOnTransformObject in c++ ? :smiley:

2

Hi,

I’ve used it in Bongo and it’s fairly straightforward. You’ll need to create a class that inherits from CRhinoOnTransformObject. That in turn inherits from CRhinoEventWatcherEx so you have access to Register and Enable to set it up. The Notify override is called when a transform event has happened. The CRhinoOnTransformObject::CParameters passed into Notify gives you a list all the objects and grips that are being transformed as well as the transformation being applied.

class CYourOnTransformObject : CRhinoOnTransformObject
{
public:
	CYourOnTransformObject () : CRhinoOnTransformObject(Your_PlugIn_Id) { }

	~CYourOnTransformObject () { }

	void Notify(const class CRhinoOnTransformObject::CParameters& params) override
    {
        //Your logic here
    }
};

From there it’s as simple as creating and registering an instance and enabling it when you need it to be.

3

Hi@Joshua_Kennedy;
Thank you for your help.
I still don’t quite understand, I want to get the Transformation when have some object move, roatate or scale, I have try to do that in OnReplaceObject event, but failed :sweat_smile:

class CRhinoEventWatcher : public CRhinoEventWatcher 
{
  void OnReplaceObject( CRhinoDoc& doc, CRhinoObject& old_object, CRhinoObject& new_object );
};
void CRhinoEventWatcherr::OnReplaceObject(CRhinoDoc& doc, CRhinoObject& old_object, CRhinoObject& new_object)
{
	CYourOnTransformObject my;
}
class CYourOnTransformObject : CRhinoOnTransformObject
{
public:
	CYourOnTransformObject() : CRhinoOnTransformObject(ON_UuidFromString(L"5D281573-6581-4227-A72A-FD5DFEB1F3B7")) { }

	~CYourOnTransformObject() = default;

	void Notify(const class CRhinoOnTransformObject::CParameters& params) override
	{
		RhinoApp().Print(L"%d\n", params.m_object_count);
	}
};
4

Hi @pythonuser,

This on on CRhinoOnTransformObject::CParameters:

// Transformation that will be applied
ON_Xform m_xform;

for example:

void CTestOnTransformObject ::Notify(const class CRhinoOnTransformObject::CParameters& params)
{
  ON_Xform xform = params.m_xform;
  // todo...
}

Is this what you are looking for?

– Dale