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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 mapper import DataSetMapper |
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from lookuptable import LookupTable |
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from actor import Actor3D |
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from constant import Viewport, Color, Lut, ColorMode |
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from streamlinemodule import StreamLineModule |
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from tube import Tube |
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from point import PointSource |
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from outline import Outline |
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from average import CellDataToPointData |
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from position import GlobalPosition |
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|
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# NOTE: DataSetMapper, Actor3D, PointSource, StreamLineModule and Tube were |
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# inherited to allow access to their public methods from the driver. |
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class StreamLine(DataSetMapper, Actor3D, PointSource, StreamLineModule, Tube): |
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""" |
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Class that shows the direction of particles of a vector field using |
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streamlines.The streamlines can either be colored or grey-scaled, |
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depending on the lookup table used. If the streamlines are colored, |
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there are two possible coloring modes: (1) using vector data or (2) |
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using scalar data. |
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""" |
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|
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# The SOUTH_WEST default viewport is used when there is only one viewport. |
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# This saves the user from specifying the viewport when there is only one. |
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# If no lut is specified, the color scheme will be used. |
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def __init__(self, scene, data_collector, viewport = Viewport.SOUTH_WEST, |
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color_mode = ColorMode.VECTOR, lut = Lut.COLOR, cell_to_point = False, |
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outline = True): |
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""" |
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Initialise the StreamLine. |
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|
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@attention: The source can either be point or cell data. If the |
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source is cell data, a conversion to point data may or may not be |
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required, in order for the object to be rendered correctly. |
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If a conversion is needed, the 'cell_to_point' flag must be set to |
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'True', otherwise 'False' (which is the default). |
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|
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@type scene: L{Scene <scene.Scene>} object |
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@param scene: Scene in which objects are to be rendered on |
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@type data_collector: L{DataCollector <datacollector.DataCollector>} |
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object |
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@param data_collector: Deal with source of data for visualisation |
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@type viewport: L{Viewport <constant.Viewport>} constant |
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@param viewport: Viewport in which the object is to be rendered on |
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@type color_mode: L{ColorMode <constant.ColorMode>} constant |
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@param color_mode: Type of color mode |
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@type lut : L{Lut <constant.Lut>} constant |
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@param lut: Lookup table color scheme |
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@type cell_to_point: Boolean |
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@param cell_to_point: Converts cell data to point data (by averaging) |
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@type outline: Boolean |
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@param outline: Places an outline around the domain surface |
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""" |
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|
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self.__scene = scene |
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self.__data_collector = data_collector |
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self.__viewport = viewport |
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self.__color_mode = color_mode |
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self.__lut = lut |
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self.__cell_to_point = cell_to_point |
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self.__outline = outline |
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|
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# Keeps track whether Streamline has been modified. |
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self.__modified = True |
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PointSource.__init__(self) |
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StreamLineModule.__init__(self) |
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Tube.__init__(self) |
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DataSetMapper.__init__(self) |
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Actor3D.__init__(self) |
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scene._addVisualizationModules(self) |
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|
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# ----- Outline ----- |
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|
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# NOTE: Changes cannot be made to the Outline's properties from the |
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# driver. |
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if(self.__outline == True): |
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outline = Outline(self.__data_collector._getDataCollectorOutput()) |
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mapper = DataSetMapper() |
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mapper._setupDataSetMapper(outline._getOutlineOutput()) |
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|
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actor3D = Actor3D() |
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actor3D._setupActor3D(mapper._getDataSetMapper()) |
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# Default outline color is black. |
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actor3D.setColor(Color.BLACK) |
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|
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# Default line width is 1. |
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actor3D._setLineWidth(1) |
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self.__scene._addActor3D(self.__viewport, actor3D._getActor3D()) |
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|
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# ----- Streamline ----- |
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|
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# NOTE: Lookup table color mapping (color or grey scale) MUST be set |
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# before DataSetMapper. If it is done after DataSetMapper, no effect |
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# will take place. |
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if(self.__lut == Lut.COLOR): # Colored lookup table. |
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lookup_table = LookupTable() |
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lookup_table._setTableValue() |
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elif(self.__lut == Lut.GREY_SCALE): # Grey scaled lookup table. |
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lookup_table = LookupTable() |
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lookup_table._setLookupTableToGreyScale() |
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|
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if(self.__cell_to_point == True): # Converts cell data to point data. |
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c2p = CellDataToPointData( |
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self.__data_collector._getDataCollectorOutput()) |
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self._setupPointSource(c2p._getCellToPointOutput()) |
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self._setupStreamLineModule(c2p._getCellToPointOutput(), |
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self._getPointSourceOutput()) |
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elif(self.__cell_to_point == False): # No conversion happens. |
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self._setupPointSource( |
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self.__data_collector._getDataCollectorOutput()) |
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self._setupStreamLineModule( |
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self.__data_collector._getDataCollectorOutput(), |
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self._getPointSourceOutput()) |
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|
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self._setupTube(self._getStreamLineModuleOutput()) |
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self._setupDataSetMapper(self._getTubeOutput(), |
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lookup_table._getLookupTable()) |
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|
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self._setupActor3D(self._getDataSetMapper()) |
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self.__scene._addActor3D(self.__viewport, self._getActor3D()) |
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|
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def _isModified(self): |
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""" |
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Return whether the StreamLine or DataCollector has been modified. |
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|
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@rtype: Boolean |
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@return: True or False |
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""" |
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|
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return self.__modified or self.__data_collector._isModified() |
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|
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def _render(self): |
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""" |
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Render the streamline. |
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""" |
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|
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if (self._isModified() == True): |
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if(self._isPointSourceCenterSet() != True): |
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center = self.__data_collector._getCenter() |
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center = GlobalPosition(center[0], center[1], center[2]) |
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self.setPointSourceCenter(center) |
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|
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self._setPointSourceCenter() |
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|
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if(self.__data_collector._isScalarSet() == True): |
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self.__data_collector._setActiveScalar() |
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if(self.__data_collector._isVectorSet() == True): |
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self.__data_collector._setActiveVector() |
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|
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# Color streamline by vector. |
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if(self.__color_mode == ColorMode.VECTOR): |
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self._setScalarVisibilityOn() |
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self._setSpeedScalarsOn() |
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self._setScalarRange(self.__data_collector._getVectorRange()) |
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# Color streamline by scalar. |
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elif(self.__color_mode == ColorMode.SCALAR): |
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self._setScalarVisibilityOn() |
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self._setSpeedScalarsOff() |
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self._setScalarRange(self.__data_collector._getScalarRange()) |
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|
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self.__modified = False |
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|
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