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CustomGridPlane.py

"""

This module shows a grid plane of the given input grid.  The plane can
be shown as a wireframe or coloured surface with or without scalar
visibility and contour lines.  The module basically wraps around the
vtk*GeometryFilters.  This module enables one to completely configure
the grid plane.  It works only for structured grid, structured point
and rectilinear grid datasets.  Note that one can either specify a
total number of contours between the minimum and maximum values by
entering a single integer or specify the individual contours by
specifying a Python list/tuple in the GUI.

This code is distributed under the conditions of the BSD license.  See
LICENSE.txt for details.

Copyright (c) 2001-2002, Prabhu Ramachandran.
"""

__author__ = "Prabhu Ramachandran <prabhu_r@users.sf.net>"
__version__ = "$Revision: 1.10 $"
__date__ = "$Date: 2004/07/06 04:29:31 $"

import Base.Objects, Common
import Tkinter, tkColorChooser
import vtkpython
import vtkPipeline.vtkMethodParser

debug = Common.debug

def set_extents (plane, lst):
    debug ("In set_extents ()")
    plane.SetExtent (lst[0], lst[1], lst[2], lst[3], lst[4], lst[5])

00034 class CustomGridPlane (Base.Objects.Module):

    """This module shows a grid plane of the given input grid.  The
    plane can be shown as a wireframe or coloured surface with or
    without scalar visibility and contour lines.  The module basically
    wraps around the vtk*GeometryFilters.  This module enables one to
    completely configure the grid plane.  It works only for structured
    grid, structured point and rectilinear grid datasets.  Note that
    one can either specify a total number of contours between the
    minimum and maximum values by entering a single integer or specify
    the individual contours by specifying a Python list/tuple in the
    GUI."""
    
00047     def __init__ (self, mod_m): 
        debug ("In CustomGridPlane::__init__ ()")
        Common.state.busy ()
        Base.Objects.Module.__init__ (self, mod_m)
        self.act = None
        out = self.mod_m.GetOutput ()
        if out.IsA('vtkStructuredGrid'):
            self.plane = vtkpython.vtkStructuredGridGeometryFilter ()
        elif out.IsA ('vtkStructuredPoints') or out.IsA('vtkImageData'):
            if hasattr (vtkpython, 'vtkImageDataGeometryFilter'):
                self.plane = vtkpython.vtkImageDataGeometryFilter ()
            else:
                self.plane = vtkpython.vtkStructuredPointsGeometryFilter ()
        elif out.IsA ('vtkRectilinearGrid'):
            self.plane = vtkpython.vtkRectilinearGridGeometryFilter ()
        else:
            msg = "This module does not support the %s dataset."%(out.GetClassName())
            raise Base.Objects.ModuleException, msg

        self.cont_fil = vtkpython.vtkContourFilter ()
        self.mapper = self.map = vtkpython.vtkPolyDataMapper ()
        self.actor = self.act = vtkpython.vtkActor ()
        self._initialize ()
        self._gui_init ()
        self.renwin.Render ()
        Common.state.idle ()

    def __del__ (self): 
        debug ("In CustomGridPlane::__del__ ()")
        if self.act:
            self.renwin.remove_actors (self.act)
        self.renwin.Render ()

    def _initialize (self): 
        debug ("In CustomGridPlane::_initialize ()")
        self.map.SetLookupTable (self.mod_m.get_scalar_lut ())
        self.data_range = self.mod_m.get_scalar_data_range ()
        self.map.SetScalarRange (self.data_range)
        data_out = self.mod_m.GetOutput ()
        dim = data_out.GetDimensions ()
        self.dim = [dim[0] -1, dim[1] -1, dim[2] -1]
        self.plane.SetInput (data_out)
        self.map.SetInput (self.plane.GetOutput ())
        self.act.SetMapper (self.map)
        self.act.GetProperty ().SetColor (*Common.config.fg_color)
        self.act.GetProperty ().BackfaceCullingOff ()
        self.act.GetProperty ().FrontfaceCullingOff ()
        self.act.GetProperty ().SetLineWidth (1.0)
        self.act.GetProperty ().SetRepresentation (1)
        self.map.SetScalarVisibility (0)
        data_out = self.mod_m.GetOutput ()
        self.renwin.add_actors (self.act)
        # used for the pipeline browser
        self.pipe_objs = self.act
        
    def _gui_init (self): 
        debug ("In CustomGridPlane::_gui_init ()")
        self.slider = []
        self.slider_pos = [0, self.dim[0], 0, self.dim[1], 0, 0]
        self.config_extents ()
        self._contour_init ()  
        
00109     def _contour_init (self):
        debug ("In CustomGridPlane::_contour_init ()")
        Base.Objects.Module._contour_init (self)
        self.contour_on.set (0)
        self.linew_var.set (self.act.GetProperty ().GetLineWidth ())
        self.n_cnt.set ("10")
        dr = self.mod_m.get_scalar_data_range ()
        self.min_cnt.set (dr[0])
        self.max_cnt.set (dr[1])
        
00119     def SetInput (self, source): 
        debug ("In CustomGridPlane::SetInput ()")
        Common.state.busy ()
        self.plane.SetInput (source)
        dim = source.GetDimensions ()
        self.dim = [dim[0] -1, dim[1] -1, dim[2] -1]
        if self.slider:
            for i in range (6):
                val = self.dim[i/2]
                self.slider[i].config (from_=0, to=val)
                
        dr = self.mod_m.get_scalar_data_range ()
        if (dr[0] != self.data_range[0]) or (dr[1] != self.data_range[1]):
            self.map.SetScalarRange (dr)
            self.data_range = dr
            self.min_cnt.set (dr[0])
            self.max_cnt.set (dr[1])
            self.change_contour ()
        Common.state.idle ()

00139     def save_config (self, file): 
        debug ("In CustomGridPlane::save_config ()")
        file.write ("%s\n"%str (self.slider_pos))
        file.write ("%d, %s, %f, %f\n"%(self.contour_on.get (),
                                        self.n_cnt.get (),
                                        self.min_cnt.get (),
                                        self.max_cnt.get ()))
        p = vtkPipeline.vtkMethodParser.VtkPickler ()
        for obj in (self.plane, self.cont_fil, self.map, self.act,
                    self.act.GetProperty ()):
            p.dump (obj, file)

00151     def load_config (self, file): 
        debug ("In CustomGridPlane::load_config ()")
        self.slider_pos = eval (file.readline ())
        cnt_on, n_cnt, min_cnt, max_cnt = eval (file.readline ())
        self.contour_on.set (cnt_on)
        self.n_cnt.set (str(n_cnt))
        self.min_cnt.set (min_cnt)
        self.max_cnt.set (max_cnt)
        p = vtkPipeline.vtkMethodParser.VtkPickler ()
        if self.plane.GetClassName () == 'vtkImageDataGeometryFilter':
            p.load (self.plane, file, 'vtkStructuredPointsGeometryFilter')
        else:
            p.load (self.plane, file, 'vtkImageDataGeometryFilter')        
        for obj in (self.cont_fil, self.map, self.act,
                    self.act.GetProperty ()):        
            p.load (obj, file)
        self.config_extents ()
        self.do_contour ()
        
00170     def config_changed (self):
        debug ("In CustomGridPlane::config_changed ()")
        self.act.GetProperty ().SetColor (*Common.config.fg_color)

    def make_main_gui (self):
        debug ("In CustomGridPlane::make_main_gui ()")
        self.make_slider_gui ()
        self.make_options_gui ()

    def make_slider_gui (self):
        debug ("In CustomGridPlane::make_slider_gui ()")
        frame = Tkinter.Frame (self.root, relief='ridge', bd=2)
        frame.pack (side='top', fill='both', expand=1)
        txt = ("X Min", "X Max", "Y Min", "Y Max", "Z Min", "Z Max")
        self.slider = []
        for i in range (6):
            val = self.dim[i/2]
            sl = Tkinter.Scale (frame, label=txt[i], from_=0,
                                to=val, length="8c", orient='horizontal')
            sl.set (self.slider_pos[i])
            sl.grid (row=i, column=0)
            sl.bind ("<ButtonRelease>", self.change_slider)
            self.slider.append (sl)

    def make_options_gui (self): 
        debug ("In CustomGridPlane::make_options_gui ()")
        self.make_actor_gui (compact=1)
        self.make_contour_gui ()

    def config_extents (self): 
        debug ("In CustomGridPlane::config_extents ()")
        Common.state.busy ()
        set_extents (self.plane, self.slider_pos)
        self.renwin.Render ()
        Common.state.idle ()

    def change_slider (self, event=None): 
        debug ("In CustomGridPlane::change_slider ()")
        for i in range (6):
            self.slider_pos[i] = self.slider[i].get ()
        self.config_extents ()

00212     def do_contour (self, event=None):
        debug ("In CustomGridPlane::do_contour ()")
        Common.state.busy ()
        if self.contour_on.get ():
            if not self.mod_m.get_scalar_data_name ():
                self.contour_on.set (0)
                msg = "Warning: No scalar data present to contour!"
                Common.print_err (msg)
                return
            self.cont_fil.SetInput (self.plane.GetOutput ())
            self.map.SetInput (self.cont_fil.GetOutput ())
        else:
            self.map.SetInput (self.plane.GetOutput ())
        self.change_contour ()
        Common.state.idle ()

00228     def change_contour (self, event=None):
        debug ("In CustomGridPlane::change_contour ()")
        Common.state.busy ()
        min_cnt = self.min_cnt.get ()
        max_cnt = self.max_cnt.get ()        
        if max_cnt < min_cnt:
            msg = "Error: Max. contour less than min. contour.  "\
                  "Setting to defaults."
            debug (msg)
            dr = self.data_range
            min_cnt, max_cnt = dr[0], dr[1]
            self.min_cnt.set (min_cnt)
            self.max_cnt.set (max_cnt)

        n_cnt = eval (self.n_cnt.get ())
        auto = 1
        if hasattr(n_cnt, "__getitem__"):
            auto = 0
        if self.contour_on.get ():
            if auto:
                self.cont_fil.GenerateValues (n_cnt, min_cnt, max_cnt)
            else:
                self.cont_fil.SetNumberOfContours(len(n_cnt))
                for i in range(len(n_cnt)):
                    self.cont_fil.SetValue(i, n_cnt[i])
            self.cont_fil.Update ()
        self.renwin.Render ()
        Common.state.idle ()

00257     def close_gui (self, event=None):
        debug ("In CustomGridPlane::close_gui ()")
        Base.Objects.Module.close_gui (self, event)
        self.slider = []

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