[vtkusers] vtkMutableDirectedGraph and Python

[Jeff Baumes]

In recent VTK, SetInput has been superceeded by SetInputData. Try using
that method name and it should work for you.

Jeff

On Thursday, November 7, 2013, Meehan, Bernard wrote:

> I was trying to convert some of the C++ examples into python, mostly so
> that I could learn about how all of the classes work together, and can't
> seem to get a vtkMutableDirectedGraph hooked up with a vtkGraphLayout in a
> pipeline Š the original code was here
> (http://www.vtk.org/Wiki/VTK/Examples/Cxx/Graphs/VisualizeDirectedGraph).
>
> Here is what I had done in Python:
> import vtk
>
> g = vtk.vtkMutableDirectedGraph()
>
> verts = [g.AddVertex() for i in range(4)]
>
> g.AddGraphEdge(verts[0], verts[1])
> g.AddGraphEdge(verts[1], verts[2])
> g.AddGraphEdge(verts[2], verts[0])
>
> g_layout = vtk.vtkGraphLayout()
> # If I uncomment this line and run, I get the following error:
> # TypeError: SetInputConnection argument 1: method requires a
> vtkAlgorithmOutput, a vtkMutableDirectedGraph was provided.
> # g_layout.SetInputConnection(g)
>
> # If I uncomment this line and run, I get the following error:
> # AttributeError: SetInput
> # g_layout.SetInput(g)
>
> # ?? any ideas on how to hook these up ??
>
> g_layout.SetLayoutStrategy(vtk.vtkSimple2DLayoutStrategy())
>
> # Do layout manually before handing graph to the view. This allows us to
> know
> # the positions of the edge arrows.
> g_layout_v = vtk.vtkGraphLayoutView()
>
> # Tell the view to use the vertex layout we provide.
> g_layout_v.SetStrategyToPassThrough()
>
> # The arrows will be positioned on a straight line between the two
> vertices so
> # tell the view not to draw arcs for the parallel edges.
> g_layout_v.SetEdgeLayoutStrategyToPassThrough()
>
> # Add the graph to the view. This will render vertices and edges, but not
> the
> # edge arrows.
> g_layout_v.AddRepresentationFromInputConnection(g_layout.GetOutputPort())
>
> # Manually create an actor containing the glyphed arrows.
> g2pd = vtk.vtkGraphToPolyData()
> g2pd.SetInputConnection(g_layout.GetOutputPort())
> g2pd.EdgeGlyphOutputOn()
>
> # Set the position (0: edge start, 1: edge end) where the edge arrows
> should
> # go.
> g2pd.SetEdgeGlyphPosition(0.98)
>
> # Make a simple edge arrow for glyphing.
> arrow = vtk.vtkArrowSource()
> arrow.SetGlyphTypeToEdgeArrow()
> arrow.SetScale(0.1)
> arrow.Update() # necessary?
>
> # Use a vtkGlyph3D to repeat the glyph on all edges.
> glyph = vtk.vtkGlyph3D()
> glyph.SetInputConnection(0, g2pd.GetOutputPort(1)) # what?
> glyph.SetInputConnection(1, arrow.GetOutputPort())
>
> mapper = vtk.vtkPolyDataMapper()
> mapper.SetInputConnection(glyph.GetOutputPort())
>
> actor = vtk.vtkActor()
> actor.SetMapper(mapper)
>
> g_layout_v.ResetCamera()
> g_layout_v.Render()
> g_layout_v.GetInteractor().Start()
>
>
>
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