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""" |
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@author: John NGUI |
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""" |
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|
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import vtk |
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from constant import Source |
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|
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class DataCollector: |
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""" |
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Class that defines a data collector which dealrs with the source |
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of data for the visualisation. |
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""" |
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|
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def __init__(self, source = Source.XML): |
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""" |
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Initialise the data collector. |
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|
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@type source: L{Source <constant.Source>} constant |
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@param source: Source data type |
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""" |
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|
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if(source == Source.XML): # Source is an XML file. |
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self.__vtk_xml_reader = vtk.vtkXMLUnstructuredGridReader() |
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|
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def setFileName(self, file_name): |
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""" |
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Set the source file name to read. |
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|
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@type file_name: String |
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@param file_name: Name of the file to read |
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""" |
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|
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self.__vtk_xml_reader.SetFileName(file_name) |
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self.__output = self.__vtk_xml_reader.GetOutput() |
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|
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# NOTE: Update must be called after SetFileName to make the reader |
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# up to date. Otherwise, some output values may be incorrect. |
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self.__vtk_xml_reader.Update() |
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|
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def _setActiveScalar(self, scalar): |
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""" |
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Specify the scalar field to load from the source file. |
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|
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@type scalar: String |
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@param scalar: Scalar field to load from the file. |
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""" |
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|
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self._getOutput().GetPointData().SetActiveScalars(scalar) |
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|
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def _setActiveVector(self, vector): |
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""" |
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Specify the vector field to load from the source file. |
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|
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@type vector: String |
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@param vector: Vector field to load from the file. |
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""" |
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|
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self._getOutput().GetPointData().SetActiveVectors(vector) |
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|
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def _setActiveTensor(self, tensor): |
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""" |
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Specify the tensor field to load from the source file. |
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|
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@type tensor: String |
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@param tensor: Tensor field to load from the file. |
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""" |
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|
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self._getOutput().GetPointData().SetActiveTensors(tensor) |
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|
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def _getScalarRange(self): |
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""" |
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Return the scalar range. |
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|
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@rtype: Two column tuple |
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@return: Scalar range |
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""" |
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|
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return self._getOutput().GetPointData().GetScalars().GetRange(-1) |
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|
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def _getVectorRange(self): |
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""" |
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Return the vector range. |
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|
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@rtype: Two column tuple |
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@return: Vector range |
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""" |
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|
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vector_range = self._getOutput().GetPoitData().GetVectors().GetRange(-1) |
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|
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# NOTE: Generally GetRange(-1) returns the correct vector range. |
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# However, there are certain data sets where GetRange(-1) seems |
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# to return incorrect mimimum vector although the maximum vector is |
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# correct. As a result, the mimimum vector has been hard coded to 0.0 |
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# to accommodate those incorrect cases. |
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return (0.0, vector_range[1]) |
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|
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def _getTensorRange(self): |
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""" |
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Return the tensor range. |
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|
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@rtype: Two column table |
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@return: Tensor range |
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""" |
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|
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return self._getOutput().GetPointData().GetTensors().GetRange() |
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|
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def _getOutput(self): |
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""" |
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Return the output of the data collector. |
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|
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@rtype: vtkUnstructuredGrid |
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@return: Unstructured grid |
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""" |
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|
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return self.__output |
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|
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|
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############################################################################### |
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|
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|
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from constant import ImageFormat |
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|
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class ImageReader: |
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""" |
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Class that defines an image reader. |
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""" |
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|
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def __init__(self, format): |
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""" |
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Initialise the image reader. |
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|
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@type format: String |
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@param format: Format of the image |
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""" |
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|
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self.__format = format |
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self.__vtk_image_reader = self.getImageReader() |
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|
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def getImageReader(self): |
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""" |
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Return the appropriate image reader based on the supplied image |
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format. |
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|
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@rtype: vtkImageReader2 (i.e. vtkJPEGReader, etc) |
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@return: Image reader |
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""" |
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|
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if(self.__format == ImageFormat.JPG): |
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return vtk.vtkJPEGReader() |
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elif(self.__format == ImageFormat.BMP): |
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return vtk.vtkBMPReader() |
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elif(self.__format == ImageFormat.PNM): |
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return vtk.vtkPNMReader() |
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elif(self.__format == ImageFormat.PNG): |
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return vtk.vtkPNGReader() |
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elif(self.__format == ImageFormat.TIF): |
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return vtk.vtkTIFFReader() |
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|
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def setFileName(self, file_name): |
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""" |
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Set the image file name. |
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|
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@type file_name: String |
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@param file_name: Image file name to be read |
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""" |
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|
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self.__vtk_image_reader.SetFileName(file_name) |
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|
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def _getOutput(self): |
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""" |
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Return the output of the image reader. |
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|
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@rtype: vtkImageData |
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@return Image data |
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""" |
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|
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return self.__vtk_image_reader.GetOutput() |
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