[vtkusers] labelling iso-lines

[rashedk]

Thanks Bill. I found the example very useful and helpful. 

One small problem which you had put as a note: the labels are 2D actors and
thus show up even when they are obstructed in the field-of-view by a 3D
surface. I guess there is no easy workaround if one uses
vtkLabeledDataMapper as it is sub-classed from vtkMapper2D. But a quick
dirty fix is to drop vtkLabeledDataMapper and instead use vtkVectorText and
vtkFollower to print 3D text iso-contour labels. 


Rashed. 


David Gobbi-3 wrote:
> 
> The vtkCell subclasses are chock full of unwrappable methods.  I ain't
> touching them.
> 
>    David
> 
> 
> On Wed, May 19, 2010 at 1:15 PM, Jothy <jothybasu at gmail.com> wrote:
>> Thanks very much!
>>
>> Could you please have a look at sometime "PointInPolygon" method in
>> vtkPolygon. This method is not available in python. I suspect the reason
>> could be same.
>>
>> Thanks again,
>>
>> Jothy
>>
>> On Wed, May 19, 2010 at 8:11 PM, David Gobbi <david.gobbi at gmail.com>
>> wrote:
>>>
>>> Now in the nightlies: GetNextCell(vtkIdList *pts), GetCell(vtkIdType
>>> loc, vtkIdList *pts).
>>>
>>>  David
>>>
>>>
>>> On Wed, May 19, 2010 at 12:10 PM, Jothy <jothybasu at gmail.com> wrote:
>>> > Thanks very much. Alert us on the list, when do this.
>>> >
>>> > Jothy
>>> >
>>> > On Wed, May 19, 2010 at 7:08 PM, David Gobbi <david.gobbi at gmail.com>
>>> > wrote:
>>> >>
>>> >> Hi Jothy,
>>> >>
>>> >> The GetNextCell() method's arguments are not wrappable:
>>> >>
>>> >>  int GetNextCell(vtkIdType& npts, vtkIdType* &pts);
>>> >>
>>> >> Since this same problem has bitten me, too, and since there are no
>>> >> easy workarounds, I'll add a wrappable method to the nightly VTK:
>>> >>
>>> >>  int GetNextCell(vtkIdList *pts);
>>> >>
>>> >> This will form a nice symmetry with the InsertNextCell(vtkIdList
>>> *pts)
>>> >> method.
>>> >>
>>> >>   David
>>> >>
>>> >>
>>> >> On Wed, May 19, 2010 at 11:46 AM, Jothy <jothybasu at gmail.com> wrote:
>>> >> > Could someone convert it to python. I tried, but it throws some
>>> error
>>> >> > at
>>> >> >
>>> >> > vtkIdType *indices;
>>> >> >
>>> >> >   vtkIdType numberOfPoints;
>>> >> >   unsigned int lineCount = 0;
>>> >> >   for (cells->InitTraversal();
>>> >> >
>>> >> >        cells->GetNextCell(numberOfPoints, indices);
>>> >> >        lineCount++)
>>> >> >
>>> >> >
>>> >> >
>>> >> > Thanks,
>>> >> >
>>> >> > Jothy
>>> >> >
>>> >> >
>>> >> >
>>> >> > On Wed, May 19, 2010 at 1:24 PM, Bill Lorensen
>>> >> > <bill.lorensen at gmail.com>
>>> >> > wrote:
>>> >> >>
>>> >> >> I've added an example that illustrates one way to place labels on
>>> >> >> isolines generated by vtkContourFilter.
>>> >> >>
>>> >> >> http://vtk.org/Wiki/VTK/Examples/Visualization/LabelContours
>>> >> >>
>>> >> >> Bill
>>> >> >>
>>> >> >> On Tue, May 18, 2010 at 9:35 PM, rashedk
>>> <rashed.vtk at googlemail.com>
>>> >> >> wrote:
>>> >> >> >
>>> >> >> > Thanks Bill!  I agree to your T&C :)
>>> >> >> >
>>> >> >> >
>>> >> >> >
>>> >> >> > rashedk wrote:
>>> >> >> >>
>>> >> >> >> Hi all,
>>> >> >> >>
>>> >> >> >> vtkContourFilter can draw contours on a dataset, however, is it
>>> >> >> >> possible
>>> >> >> >> to label/annotate these contours? I looked at
>>> >> >> >> vtkLabeledDataMapper
>>> >> >> >> but
>>> >> >> >> it
>>> >> >> >> only seems to label points, cells, etc.
>>> >> >> >>
>>> >> >> >> Rashed.
>>> >> >> >>
>>> >> >> >
>>> >> >> > --
>>> >> >> > View this message in context:
>>> >> >> >
>>> http://old.nabble.com/labelling-iso-lines-tp28597889p28603314.html
>>> >> >> > Sent from the VTK - Users mailing list archive at Nabble.com.
>>> >> >> >
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>>
>>
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