[vtkusers] vtkTexturedActor2D: scale an image with texture support (make use of bilinear filtering)

[Meister, Martin MM (E F CI C5 5)]

Hi guys,

wondering what I did wrong: I want to display a 2D image as an annotation. can do the job many ways, one is with imagemapper and actor2d but rescaling just looked bad.

So I decided to use vtkTexturedActor2D, since the vtkTexture works so well in 2D. I want to give the user the opportunity to scale ans position the image. Positioning works, but scaling the actor just wont work. Scaling the texture/imagedata itself is not an option.



Ideas are very much appreciated,

Thanks,
Martin


# ###############
# a plane and texcoords, image in "png"
plane = vtk.vtkPolyData();

X = png.GetOutput().GetDimensions()[0]
Y = png.GetOutput().GetDimensions()[1]

texcoords = vtk.vtkFloatArray()
texcoords.SetNumberOfComponents(2)
texcoords.InsertNextTuple([0,0])
texcoords.InsertNextTuple([0,1])
texcoords.InsertNextTuple([1,1])
texcoords.InsertNextTuple([1,0])

points = vtk.vtkPoints();
points.InsertNextPoint([0  , 0  , 0]);
points.InsertNextPoint([0  , Y  , 0]);
points.InsertNextPoint([X  , Y  , 0]);
points.InsertNextPoint([X  , 0  , 0]);

poly = vtk.vtkPolygon()
poly.GetPointIds().SetNumberOfIds(4)
poly.GetPointIds().SetId(0,0)
poly.GetPointIds().SetId(1,1)
poly.GetPointIds().SetId(2,2)
poly.GetPointIds().SetId(3,3)

polygons = vtk.vtkCellArray()
polygons.InsertNextCell(poly)

pd2d = vtk.vtkPolyData()
pd2d.SetPoints(points)
pd2d.GetPointData().SetTCoords(texcoords)
pd2d.SetPolys(polygons)

pdm = vtk.vtkPolyDataMapper2D()
pdm.SetInput(pd2d)


# vtktexturedActor stuff
act5 = vtk.vtkTexturedActor2D()
act5.SetMapper(pdm)
act5.SetTexture(tex2d)
act5.GetPositionCoordinate().SetCoordinateSystemToNormalizedViewport()
act5.GetPositionCoordinate().SetValue(0.333, 0.333)

# all of these do not work
act5.GetPosition2Coordinate().SetValue(0.333, 0.333)
act5.SetHeight(120)
act5.SetWidth(90)
act5.SetPosition2(0.1,0.1)



# add to renderer
ren.AddActor2D(act5)
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