[vtkusers] vtkWeb - sending data to the client

[Dan Lipsa]

Thanks Seb,
So I'll have to make regular arrays out of the numpy arrays and send those
over?
What about multi-dimensional numpy arrays? (2D, 3D) Do I have to flatten
them on the server and then get them into the right format on the client?

What about the numpy masked arrays? This have missing values, similar with
VTK blanking.

How efficient is this?

Thanks,
Dan


On Fri, Oct 7, 2016 at 5:27 PM, Sebastien Jourdain <
sebastien.jourdain at kitware.com> wrote:

> We do that all the time, so yes, vtk/paraview web can handle it.
>
> Just need to create a new RPC method that will build the structure the
> client expect based on its request.
>
> Here is a ParaView example which should apply to VTK if you ignore the
> ParaView proxy magic (self.reader.GetClientSideObject())
>
>     @exportRpc("my.super.app.get.table")
>     def getTable(self):
>         from vtk.util.numpy_support import vtk_to_numpy
>         returnValue = {}
>         dataTable = self.reader.GetClientSideObject().
> GetOutputDataObject(0)
>         count = dataTable.GetNumberOfColumns()
>         for idx in range(count):
>             array = dataTable.GetColumn(idx)
>             if SUPPORTED_TYPES[VTK_DATA_TYPES[array.GetDataType()]]:
>                 npArray = vtk_to_numpy(array)
>                 returnValue[array.GetName()] = [ i.item() for i in npArray
> ]
>             else:
>                 returnValue[array.GetName()] = [ array.GetValue(i) for i
> in xrange(array.GetNumberOfValues()) ]
>         return returnValue
>
> with that for our constant settings for filtering arrays we don't want to
> get on the client side.
>
> VTK_DATA_TYPES = [ 'void',            # 0
>                    'bit',             # 1
>                    'char',            # 2
>                    'unsigned_char',   # 3
>                    'short',           # 4
>                    'unsigned_short',  # 5
>                    'int',             # 6
>                    'unsigned_int',    # 7
>                    'long',            # 8
>                    'unsigned_long',   # 9
>                    'float',           # 10
>                    'double',          # 11
>                    'id_type',         # 12
>                    'unspecified',     # 13
>                    'unspecified',     # 14
>                    'signed_char' ]    # 15
>
> SUPPORTED_TYPES = { 'void': False,
>                    'bit': False,
>                    'char': True,
>                    'unsigned_char': True,
>                    'short': True,
>                    'unsigned_short': True,
>                    'int': True,
>                    'unsigned_int': True,
>                    'long': True,
>                    'unsigned_long': True,
>                    'float': True,
>                    'double': True,
>                    'id_type': True,
>                    'unspecified': False,
>                    'unspecified': False,
>                    'signed_char': True }
>
> On Fri, Oct 7, 2016 at 3:09 PM, Dan Lipsa <dan.lipsa at kitware.com> wrote:
>
>> Hi Seb and all,
>> One of the features we want to implement in our application is the
>> ability to render plots on the client (in certain cases) using alternate
>> means such as plotly.
>>
>> For this we need to send data = a numpy or numpy masked array = to the
>> client. Is there any capability in vtkWeb or do you have any advise on how
>> to do that?
>>
>> Thanks,
>> Dan
>>
>>
>
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