[vtkusers] graph
debbie larson
debbielarson_9 at hotmail.com
Fri Jun 1 15:15:30 EDT 2007
Thanks for the suggestions Brian. I am not all that good with VTK so let me
ask a few last questions about Simple2D graph layout
1) When I set the coordinates of the vertices with
for loop
pts->InsertNextPoint(x,y,0);
graph->AddVertex();
end loop
graph->SetPoints(pts)
are the x and y coordinates above, the horizontal and vertical coordinates
of the vertex in the window? Does x and y have to be within a certain range?
2) What does the SetIterationsPerLayout, SetTemperature, SetMaxIterations
do? I noticed that changing the temperature will change the graph. What is
the temperature variable controlling?
Thanks
deb
>From: "Wylie, Brian" <bnwylie at sandia.gov>
>To: "debbie larson" <debbielarson_9 at hotmail.com>,vtkusers at vtk.org
>Subject: RE: [vtkusers] graph
>Date: Fri, 1 Jun 2007 12:08:12 -0600
>
>Oh, sorry,
>
>The call should be SetJitter and not vtkSetJitter....
>
>So you just want to see edges?
>
>You can (same file) change
>
>this->VertexActor->VisibilityOn();
>to
>this->VertexActor->VisibilityOff();
>
>
>Also, from a higher perspective..., if you familiar with VTK you might
>not want to use the vtkGraphLayoutViewer... That class combines lots of
>functionality (including layout) into a meta class.
>
>If you want to have lots of flexibility and you don't want layout,
>vertices, etc... You can simply use the vtkGraphToPolyData class
>
>This takes any vtkGraph data structure and converts it to simple
>vtkPolyData... Then you could do whatever you want... Put tubes around
>the edges... Have your own glyphs for the vertices, etc...
>
> Brian Wylie - Org 1424
> Sandia National Laboratories
> MS 0822 - Building 880/A1-J
> (505)844-2238 FAX(505)845-0833
> _______ __
> /_ __(_) /_____ _____
> / / / / __/ __ `/ __ \
> / / / / /_/ /_/ / / / /
> /_/ /_/\__/\__,_/_/ /_/
> VTK Informatics Toolkit
>
>
> > -----Original Message-----
> > From: debbie larson [mailto:debbielarson_9 at hotmail.com]
> > Sent: Friday, June 01, 2007 12:00 PM
> > To: Wylie, Brian; vtkusers at vtk.org
> > Subject: RE: [vtkusers] graph
> >
> >
> > Thanks Brian. Yes that did change things. But regarding your
> > code below, I get an error message on
> > vtkSimple2DLayoutStrategy::SafeDownCast(strategy)
> > > ->vtkSetJitter(false);
> >
> > (doesnt know about vtkSetJitter). Also how can I get rid of
> > the gliphs that
> > represent the vertices?
> >
> > I basically want to see a graph whose layout looks like this
> >
> > **
> > / \
> > ** **
> > \ /
> > **
> > Is this possible?
> >
> > Thanks
> >
> > deb
> > >From: "Wylie, Brian" <bnwylie at sandia.gov>
> > >To: "debbie larson" <debbielarson_9 at hotmail.com>,vtkusers at vtk.org
> > >Subject: RE: [vtkusers] graph
> > >Date: Fri, 1 Jun 2007 11:18:08 -0600
> > >
> > >Hmmmm...
> > >
> > >Well good news and bad news....
> > >
> > >The good news is that in our sandbox we have a
> > vtkPassThrough strategy
> > >that doesn't change the position of the vertices at all...
> > The bad news
> > >is that it's not yet in vtk. :(
> > >
> > >I think the best way to "hack" it until we get that in VTK
> > (like 2 weeks
> > >from now probably) is to do the following....
> > >
> > >In vtkGraphLayoutViewer.cxx line 415 ish...
> > >
> > > else if (!strcmp(strategyName, "Simple2D"))
> > > {
> > > strategy = vtkSimple2DLayoutStrategy::New();
> > > vtkSimple2DLayoutStrategy::SafeDownCast(strategy)
> > > ->SetMaxNumberOfIterations(100);
> > > vtkSimple2DLayoutStrategy::SafeDownCast(strategy)
> > > ->SetIterationsPerLayout(100);
> > > vtkSimple2DLayoutStrategy::SafeDownCast(strategy)
> > > ->SetInitialTemperature(1);
> > > }
> > >
> > >Change to something like....
> > >
> > > else if (!strcmp(strategyName, "Simple2D"))
> > > {
> > > strategy = vtkSimple2DLayoutStrategy::New();
> > > vtkSimple2DLayoutStrategy::SafeDownCast(strategy)
> > > ->SetMaxNumberOfIterations(0);
> > > vtkSimple2DLayoutStrategy::SafeDownCast(strategy)
> > > ->SetIterationsPerLayout(0);
> > > vtkSimple2DLayoutStrategy::SafeDownCast(strategy)
> > > ->SetInitialTemperature(0);
> > > vtkSimple2DLayoutStrategy::SafeDownCast(strategy)
> > > ->vtkSetJitter(false);
> > > }
> > >
> > >This means the layout basically shouldn't DO anything
> > >
> > >
> > >Should work.... Sorry for making you hack the code... Like I said the
> > >'pass-through' strategy should be in soon....
> > >
> > > Brian Wylie - Org 1424
> > > Sandia National Laboratories
> > > MS 0822 - Building 880/A1-J
> > > (505)844-2238 FAX(505)845-0833
> > > _______ __
> > > /_ __(_) /_____ _____
> > > / / / / __/ __ `/ __ \
> > > / / / / /_/ /_/ / / / /
> > > /_/ /_/\__/\__,_/_/ /_/
> > > VTK Informatics Toolkit
> > >
> > >
> > > > -----Original Message-----
> > > > From: vtkusers-bounces+bnwylie=sandia.gov at vtk.org
> > > > [mailto:vtkusers-bounces+bnwylie=sandia.gov at vtk.org] On
> > > > Behalf Of debbie larson
> > > > Sent: Friday, June 01, 2007 10:44 AM
> > > > To: vtkusers at vtk.org
> > > > Subject: Re: [vtkusers] graph
> > > >
> > > > Hi,
> > > >
> > > > I tried to set the coordinates of the vertices and then
> > > > visualize the graph with vtkGraphLayout but it seems it
> > > > doesnt care about the positions of the vertices. I must be
> > > > missing something when I set the coordinates of those
> > > > vertices. But what? Here it is the code
> > > >
> > > > //Add vertices
> > > > VTK_CREATE(vtkPoints,pts);
> > > > VTK_CREATE(vtkGraph,graph);
> > > > graph->AddVertex();
> > > > for loop
> > > > pts->InsertNextPoint(x,y,0);
> > > > graph->AddVertex();
> > > > end loop
> > > > graph->SetPoints(pts);
> > > >
> > > > //Add Edges
> > > > for loop
> > > > graph->AddEdge(v,p);
> > > > end loop
> > > >
> > > > //view
> > > > VTK_CREATE(vtkGraphLayoutViewer,viewer);
> > > > viewer->SetInput(graph);
> > > > viewer->SetLayoutStrategy("Simple2D");//Tried also
> > ForceDirected
> > > >
> > > > VTK_CREATE(vtkRenderer,ren);
> > > > VTK_CREATE(vtkRenderWindow,win);
> > > > win->AddRenderer(ren);
> > > > VTK_CREATE(vtkRenderWindowInteractor,interact);
> > > > interact->SetRenderWindow(win);
> > > > viewer->SetRenderWindow(win);
> > > > win->GetInteractor()->Initialize();
> > > > win->GetInteractor()->Start();
> > > >
> > > >
> > > > Thanks
> > > >
> > > > deb
> > > > >From: "Jeff Baumes" <jeff.baumes at kitware.com>
> > > > >To: "debbie larson" <debbielarson_9 at hotmail.com>
> > > > >CC: vtkusers at vtk.org
> > > > >Subject: Re: [vtkusers] graph
> > > > >Date: Thu, 31 May 2007 09:17:22 -0400
> > > > >
> > > > >If you use the CVS version of VTK, the following should
> > give you a
> > > > >start. Recyclying the vertex points and using a low initial
> > > > >temperature on the layout strategy gives a jittery but reasonable
> > > > >dynamic layout. I should also point you to
> > > > vtkGraphLayoutViewer, which
> > > > >wraps most of this stuff up (but doesn't allow access to
> > the inner
> > > > >workings to do the dynamic graph layout like this), and to
> > > > >vtkDynamic2DLabelMapper in VTK/Graphics if you want to label the
> > > > >vertices.
> > > > >
> > > > >I'm using the simple macro
> > > > >#define VTK_CREATE(type, name) \
> > > > > vtkSmartPointer<type> name = vtkSmartPointer<type>::New()
> > > > >
> > > > >int main()
> > > > >{
> > > > > // Create initial cycle graph
> > > > > VTK_CREATE(vtkGraph, graph);
> > > > > for (int i = 0; i < 100; i++)
> > > > > {
> > > > > graph->AddEdge(i, (i+1)%100);
> > > > > }
> > > > >
> > > > > // Set up graph layout pipeline
> > > > > VTK_CREATE(vtkSimple2DLayoutStrategy, strategy);
> > > > > strategy->SetInitialTemperature(0.5);
> > > > > VTK_CREATE(vtkGraphLayout, layout);
> > > > > layout->SetInput(graph);
> > > > > layout->SetLayoutStrategy(strategy);
> > > > > VTK_CREATE(vtkGraphToPolyData, poly);
> > > > > poly->SetInputConnection(layout->GetOutputPort());
> > > > > VTK_CREATE(vtkPolyDataMapper, mapper);
> > > > > mapper->SetInputConnection(poly->GetOutputPort());
> > > > > VTK_CREATE(vtkActor, actor);
> > > > > actor->SetMapper(mapper);
> > > > > VTK_CREATE(vtkGlyphSource2D, glyphSource);
> > > > > glyphSource->SetGlyphTypeToVertex();
> > > > > VTK_CREATE(vtkGlyph3D, glyph);
> > > > > glyph->SetInputConnection(0, poly->GetOutputPort());
> > > > > glyph->SetInputConnection(1, glyphSource->GetOutputPort());
> > > > > VTK_CREATE(vtkPolyDataMapper, vmapper);
> > > > > vmapper->SetInputConnection(glyph->GetOutputPort());
> > > > > VTK_CREATE(vtkActor, vactor);
> > > > > vactor->SetMapper(vmapper);
> > > > > vactor->GetProperty()->SetPointSize(5);
> > > > > vactor->GetProperty()->SetColor(1, 0, 0);
> > > > >
> > > > > // Setup renderer / render window
> > > > > VTK_CREATE(vtkRenderer, ren);
> > > > > VTK_CREATE(vtkRenderWindow, win);
> > > > > win->AddRenderer(ren);
> > > > > VTK_CREATE(vtkRenderWindowInteractor, iren);
> > > > > iren->SetRenderWindow(win); VTK_CREATE(vtkInteractorStyleImage,
> > > > > style); iren->SetInteractorStyle(style); ren->AddActor(actor);
> > > > > ren->AddActor(vactor); iren->Initialize();
> > > > >
> > > > > // Render in a loop
> > > > > for (int i = 0; i < 400; i++)
> > > > > {
> > > > > // Start the layout with the existing layout
> > > > > graph->SetPoints(layout->GetOutput()->GetPoints());
> > > > > graph->AddEdge((int)(vtkMath::Random()*100),
> > > > >(int)(vtkMath::Random()*100));
> > > > > graph->Modified();
> > > > > ren->ResetCamera();
> > > > > iren->Render();
> > > > > }
> > > > > iren->Start();
> > > > > return 0;
> > > > >}
> > > > >
> > > > >Jeff
> > > > >
> > > > >On 5/28/07, debbie larson <debbielarson_9 at hotmail.com> wrote:
> > > > >>Hi,
> > > > >>
> > > > >>I would like to plot an evolving (directed) graph. I.e. I
> > > > would like
> > > > >>to display it as nodes and edges are added. The graph is
> > > > being updated
> > > > >>by some computer code and I want to redraw the graph after a few
> > > > >>node/edge additions to see how it is evolving. I would like
> > > > to display
> > > > >>it in a 2D layout (hopefully without edges intersecting
> > > > each other).
> > > > >>Can this be done in vtk?
> > > > >>Any pointers would be appreciated.
> > > > >>
> > > > >>Thanks
> > > > >>
> > > > >>deb
> > > > >>
> > > >
> > >>_________________________________________________________________
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> > > > >>_______________________________________________
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> > > > >
> > > > >
> > > > >--
> > > > >Jeff Baumes
> > > > >R&D Engineer, Kitware Inc.
> > > > >(518) 371-3971 x132
> > > > >jeff.baumes at kitware.com
> > > >
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