Hello, *Overview* I am attempting to control ParaView v3.14.1 with something other than a mouse and keyboard. I don't know how to do this - I've taken some wild guesses and bits 'n' pieces have started to work. I could really use some help from someone that knows the inner-workings though.
*What I'd Like to Happen* I have an class, foo, with some events and callbacks of its own. Foo is not related to ParaView in any way other than foo needs to make ParaView do stuff as it sees fit. In the callbacks, I'd like to do things like zoom, pan and rotate. Eventually I'd like foo to be able add filters and such too, but that's a long way down the road. *What I've Tried* foo has 3 events similar to OnButtonDown, OnMouseMove, and OnButtonUp. I figure, why not just call these methods (within vtkPVInteractorStyle) from foo? This is what I've been trying. I have made foo a friend of vtkPVInteractorStyle. I've created a global pointer variable, g_pInteractorStyle, which points to vtkPVInteractorStyle. I've created a mutator and two integer variables - m_x and m_y - within foo to hold mouse coordinates. Any time that GetEventPosition()[0/1] is called, I save those values to local variables - x and y - and pass them into foo's mutator. This way, any time a real mouse is used, foo gets updated coordinates. This also now gives me starting points to pass into OnMouseMove. >From foo I first call g_pInteractorStyle->OnButtonDown(3, 0, 0). Ideally, this will initiate zoom, which it seems to. Following that, I make a series of calls following the pattern: g_pInteractorStyle->Current->OnMouseMove(m_x, m_y + *offset*, g_pInteractorStyle->CurrentRenderer, g_pInteractorStyle->Interactor), where *offset* is some integer value from -49 to 49 and neither m_x or m_y change during the series of calls. Finally, I call g_pInteractorStyle->OnButtonup(3). I have also commented out one line each from OnButonDown and OnButtonUp: this->InvokeEvent(vtkCommand::[Start/End]InteractionEvent). With these two lines in place, OnButtonUp causes a crash. Without these lines in place (when they're commented out), ParaView acts just fine. I know this is NOT a good fix and I'm open to other suggestions, but it (this aspect) seems to be working at the moment. I've also tried looking into the QT libraries and moving the cursor via QT. Unfortunately, I've been unable to find the right cursor because nothing I've done has had any effect on the cursor I'm staring at (tried setPos() and setShape()). *The Problem* OnMouseMove() has caused problem after problem. In our current setup OnButtonDown(3, 0, 0) works great. OnMouseMove() kills paraview when it reaches vtkPVRenderView::Render() called from somewhere within vtkPVGenericRenderWindowInteractor. In a weak attempt to "fix" the problem, I tried commenting out this Render() call. Nothing too major seemed to break except that I'm blind as i try to zoom until I release the mouse button (tests were done using the mouse at first). In other words: Everything still working, but no rendering during zoom - only renders upon releasing the mouse. I now try it with foo, and it acts as though OnButtonUp(3) was never called - the whole foo routine finishes then I use the mouse and click somewhere to start a new interaction, and it zooms to wherever it should have zoomed when it finished foo's routines. So two options: I can either let it die every time it tries to render, or hold off rendering until I finish "moving the mouse" and then still be required to click the mouse somewhere when I'm finished. This is broken. And something tells me I'm going about this in a very wrong fashion. How should I be doing this? Thanks, David Zemon Computer
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