[vtkusers] Python wrapping a custom class

[Kit Chambers]

Hi,

I am trying to wrap a custom class derived from vtkImageData in python. And it works except for when i try to access my custom methods. For example:

import vtkNewDataPython as idp

mydata = idp.vtkNewData()

print "\nvtkImageData functionality"
mydata.SetDimensions(2,3,1)
dims = mydata.GetDimensions()
print "image dimensions =",dims
print "Number of points: ",mydata.GetNumberOfPoints()
print "Number of cells: ",mydata.GetNumberOfCells()

print "\ncustom functionality" 
mydata.set_myvalue()
print "Myvalue = ", mydata.get_myvalue()


Produces:
vtkImageData functionality
image dimensions = (2, 3, 1)
Number of points:  6
Number of cells:  2

custom functionality
Traceback (most recent call last):
  File "./pytest.py", line 14, in <module>
    mydata.set_myvalue()
AttributeError: set_myvalue


Basically it is doing just fine up until I try to call a custom method

The class looks like this:

#include "vtkImageData.h"

class VTK_EXPORT vtkNewData: public vtkImageData
{
public:
  static vtkNewData *New();
  void set_myvalue(){
	  this->myvalue=3;
  }
  int get_myvalue(){
	  return this->myvalue;
  }
  int myvalue;
};


The CmakeLists.txt is adapted mostly from https://github.com/paulmelis/vtk-wrapping-example <https://github.com/paulmelis/vtk-wrapping-example> and looks like this


#######################################
# Pre-requisites

# C++11 flags
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -std=c++11")

# VTK
find_package(VTK REQUIRED
                vtkCommonCore
                vtkCommonDataModel
                vtkWrappingPythonCore                  
            )
include(${VTK_USE_FILE})

# Python and vtk wrapping
find_package(PythonLibs 2.7 EXACT REQUIRED)
include(vtkWrapPython)
include_directories("${PYTHON_INCLUDE_PATH}")

#######################################
# Building vtkNewData
add_library(vtkNewData SHARED vtkNewData.cxx)
TARGET_LINK_LIBRARIES(vtkNewData ${VTK_LIBRARIES} )
if(APPLE) 
    set_target_properties(vtkNewData PROPERTIES SUFFIX ".so")
endif()

#######################################
# Wrapping vtkNewData
vtk_wrap_python3(vtkNewDataPython vtkNewDataPython_SRCS vtkNewData.cxx)

add_library(vtkNewDataPythonD ${vtkNewDataPython_SRCS} vtkNewData.cxx)
target_link_libraries(vtkNewDataPythonD         
        ${VTK_LIBRARIES}
        vtkWrappingPythonCore 
        ${VTK_PYTHON_LIBRARIES})

add_library(vtkNewDataPython MODULE vtkNewDataPythonInit.cxx)

set(VTK_MODULES_USED vtkCommonDataModel vtkCommonCore) 
set(VTK_PYTHOND_LIBS)
foreach(TMP_LIB ${VTK_MODULES_USED})
   set(VTK_PYTHOND_LIBS ${VTK_PYTHOND_LIBS} ${TMP_LIB}PythonD)
endforeach()  

target_link_libraries(vtkNewDataPython vtkNewDataPythonD ${VTK_PYTHOND_LIBS})

set_target_properties(vtkNewDataPython PROPERTIES PREFIX "")
if(WIN32 AND NOT CYGWIN)
    set_target_properties(vtkNewDataPython PROPERTIES SUFFIX ".pyd")
endif(WIN32 AND NOT CYGWIN)


I suspect there is something very simple I am missing here but cannot for the life of me think what. Any help would be appreciated.


Cheers

Kit
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