This file is indexed.

/usr/share/pyshared/tvtk/pyface/picker.py is in mayavi2 4.1.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
#------------------------------------------------------------------------------
# Copyright (c) 2005, Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license.  The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
# Thanks for using Enthought open source!
#
# Author: Enthought, Inc.
# Description: <Enthought pyface package component>
#------------------------------------------------------------------------------
"""This module provides basic picking functionality.  Using this, one
can interactively select a point and/or a cell in the data.  One can
also can use a world point picker (i.e. a generic point in space) and
probe for the data at that point.

"""
# Author: Prabhu Ramachandran <prabhu_r@users.sf.net>
# Copyright (c) 2004, Enthought, Inc.
# License: BSD Style.

from traits.api import HasTraits, Trait, Long, Array, Any, Float, \
                                 Instance, Range, true, Str
from traitsui.api import View, Group, Item, Handler
from tvtk.api import tvtk
from tvtk.tvtk_base import TraitRevPrefixMap, false_bool_trait
from apptools.persistence import state_pickler


######################################################################
# Utility functions.
######################################################################
def get_last_input(data):
    """Attempts to get the deepest possible data value in the
    pipeline.  Used when probing a selected point."""
    tmp = inp = data
    while tmp:
        try:
            tmp = inp.input
            if tmp:
                inp = tmp
        except AttributeError:
            tmp = None
    return inp


######################################################################
# `PickedData` class.
######################################################################
class PickedData(HasTraits):
    """This class stores the picked data."""

    # Was there a valid picked point?
    valid = Trait(false_bool_trait,
                  desc='specifies the validity of the pick event')
    # Id of picked point (-1 implies none was picked)
    point_id = Long(-1, desc='the picked point ID')
    # Id of picked cell (-1 implies none was picked)
    cell_id = Long(-1, desc='the picked cell ID')
    # World pick -- this has no ID.
    world_pick = Trait(false_bool_trait,
                       desc='specifies if the pick is a world pick.')
    # Coordinate of picked point.
    coordinate = Array('d', (3,), labels=['x', 'y', 'z'], cols=3,
                       desc='the coordinate of the picked point')

    # The picked data -- usually a tvtk.PointData or tvtk.CellData of
    # the object picked.  The user can use this data and extract any
    # necessary values.
    data = Any


######################################################################
# `PickerHandler` class.
######################################################################
class PickHandler(HasTraits):
    """This is the handler for the picked data.  Subclass this to do
    what you need.  Each time a pick occurs the handle_pick is called
    by the `Picker` class."""

    def handle_pick(self, data):
        """Called when a pick event happens.

        Parameters
        ----------

        - data : `PickedData` instance.
        """
        pass


######################################################################
# `DefaultPickerHandler` class.
######################################################################
class DefaultPickHandler(PickHandler):
    """The default handler for the picked data."""

    # Traits.
    ID = Trait(None, None, Long, desc='the picked ID')

    coordinate = Trait(None, None, Array('d', (3,)),
                       desc='the coordinate of the picked point')

    scalar = Trait(None, None, Float, desc='the scalar at picked point')

    vector = Trait(None, None, Array('d', (3,)),
                   desc='the vector at picked point')

    tensor = Trait(None, None, Array('d', (3,3)),
                   desc='the tensor at picked point')

    # History of picked data.
    history = Str

    default_view = View(Item(name='ID', style='readonly'),
                        Item(name='coordinate', style='readonly'),
                        Item(name='scalar', style='readonly'),
                        Item(name='vector', style='readonly'),
                        Item(name='tensor', style='readonly'),
                        Item(name='history', style='custom'),
                        )

    def __init__(self, **traits):
        super(DefaultPickHandler, self).__init__(**traits)
        # This saves all the data picked earlier.
        self.data = {'ID':[], 'coordinate':[], 'scalar':[], 'vector':[],
                     'tensor':[]}

    #################################################################
    # `DefaultPickHandler` interface.
    #################################################################
    def handle_pick(self, data):
        """Called when a pick event happens.
        """
        if data.valid_:
            if data.point_id > -1:
                self.ID = data.point_id
            elif data.cell_id > -1:
                self.ID = data.cell_id
            self.coordinate = data.coordinate

            if data.data:
                array_data = {'scalar': data.data.scalars,
                              'vector': data.data.vectors,
                              'tensor': data.data.tensors}
            else:
                array_data = {'scalar': None,
                              'vector': None,
                              'tensor': None}
            for name in array_data.keys():
                if array_data[name]:
                    setattr(self, name, array_data[name][self.ID])
                else:
                    setattr(self, name, None)
        else:
            for name in ['ID', 'coordinate', 'scalar', 'vector', 'tensor']:
                setattr(self, name, None)
        self._update_data()

    #################################################################
    # Non-public interface.
    #################################################################
    def _update_data(self):
        for name in ['ID', 'coordinate', 'scalar', 'vector', 'tensor']:
            value = getattr(self, name)
            self.data.get(name).append(getattr(self, name))
            self.history += '%s: %r\n'%(name, value)



######################################################################
# `CloseHandler` class.
######################################################################
class CloseHandler(Handler):
    """This class cleans up after the UI for the Picker is closed."""
    def close(self, info, is_ok):
        """This method is invoked when the user closes the UI."""
        picker = info.object
        picker.on_ui_close()
        return True


######################################################################
# `Picker` class.
######################################################################
class Picker(HasTraits):
    """This module creates a 'Picker' that can interactively select a
    point and/or a cell in the data.  It also can use a world point
    picker (i.e. a generic point in space) and will probe for the data
    at that point.

    The Picker is usually called via a callback from the GUI
    interactor window.  After performing a pick on the VTK scene, a
    Picker object creates a `PickedData` object and passes it on to
    the pick_handler trait for further handling.
    """

    # The version of this class.  Used for persistence.
    __version__ = 0

    # Speficifies the pick type.  The 'point_picker' and 'cell_picker'
    # options are self-explanatory.  The 'world_picker' picks a point
    # using a WorldPointPicker and additionally uses a ProbeFilter to
    # probe the data at the picked point.
    pick_type = Trait('point', TraitRevPrefixMap({'point_picker':1,
                                                  'cell_picker':2,
                                                  'world_picker':3}),
                      desc='specifies the picker type to use')

    # The pick_handler.  Set this to your own subclass if you want do
    # do something different from the default.
    pick_handler = Trait(DefaultPickHandler(), Instance(PickHandler))

    # Picking tolerance.
    tolerance = Range(0.0, 0.25, 0.025)

    # show the GUI on pick ?
    show_gui = true(desc = "whether to show the picker GUI on pick")

    # Raise the GUI on pick ?
    auto_raise = true(desc = "whether to raise the picker GUI on pick")

    default_view = View(Group(Group(Item(name='pick_type'),
                                    Item(name='tolerance'), show_border=True),
                              Group(Item(name='pick_handler', style='custom'),
                                    show_border=True, show_labels=False),
                              Group(Item(name='show_gui'),
                                    Item(name='auto_raise'), show_border=True),
                              ),
                        resizable=True,
                        buttons=['OK'],
                        handler=CloseHandler())

    #################################################################
    # `object` interface.
    #################################################################
    def __init__(self, renwin, **traits):
        super(Picker, self).__init__(**traits)

        self.renwin = renwin
        self.pointpicker = tvtk.PointPicker()
        self.cellpicker = tvtk.CellPicker()
        self.worldpicker = tvtk.WorldPointPicker()
        self.probe_data = tvtk.PolyData()
        self._tolerance_changed(self.tolerance)

        # Use a set of axis to show the picked point.
        self.p_source = tvtk.Axes()
        self.p_mapper = tvtk.PolyDataMapper()
        self.p_actor = tvtk.Actor ()
        self.p_source.symmetric = 1
        self.p_actor.pickable = 0
        self.p_actor.visibility = 0
        prop = self.p_actor.property
        prop.line_width = 2
        prop.ambient = 1.0
        prop.diffuse = 0.0
        self.p_mapper.input = self.p_source.output
        self.p_actor.mapper = self.p_mapper

        self.probe_data.points = [[0.0, 0.0, 0.0]]

        self.ui = None

    def __get_pure_state__(self):
        d = self.__dict__.copy()
        for x in ['renwin', 'ui', 'pick_handler', '__sync_trait__', '__traits_listener__']:
            d.pop(x, None)
        return d

    def __getstate__(self):
        return state_pickler.dumps(self)

    def __setstate__(self, str_state):
        # This method is unnecessary since this object will almost
        # never be pickled by itself and only via the scene, therefore
        # __init__ will be called when the scene is constructed.
        # However, setstate is defined just for completeness.
        state_pickler.set_state(self, state_pickler.loads_state(str_state))

    #################################################################
    # `Picker` interface.
    #################################################################
    def pick(self, x, y):
        """Calls one of the current pickers and then passes the
        obtained data to the `self.pick_handler` object's
        `handle_pick` method.

        Parameters
        ----------

        - x : X position of the mouse in the window.

        - y : Y position of the mouse in the window.

          Note that the origin of x, y must be at the left bottom
          corner of the window.  Thus, for most GUI toolkits, y must
          be flipped appropriately such that y=0 is the bottom of the
          window.
        """

        data = None
        if self.pick_type_ == 1:
            data = self.pick_point(x, y)
        elif self.pick_type_ == 2:
            data = self.pick_cell(x, y)
        elif self.pick_type_ == 3:
            data = self.pick_world(x, y)

        self.pick_handler.handle_pick(data)
        if self.show_gui:
            self._setup_gui()

    def pick_point(self, x, y):
        """ Picks the nearest point. Returns a `PickedData` instance."""
        self.pointpicker.pick((float(x), float(y), 0.0), self.renwin.renderer)

        pp = self.pointpicker
        id = pp.point_id
        picked_data = PickedData()
        coord = pp.pick_position
        picked_data.coordinate = coord

        if id > -1:
            data = pp.mapper.input.point_data
            bounds = pp.mapper.input.bounds

            picked_data.valid = 1
            picked_data.point_id = id
            picked_data.data = data

            self._update_actor(coord, bounds)
        else:
            self.p_actor.visibility = 0

        self.renwin.render()
        return picked_data

    def pick_cell (self, x, y):
        """ Picks the nearest cell. Returns a `PickedData` instance."""
        try:
            self.cellpicker.pick(float(x), float(y), 0.0,
                                 self.renwin.renderer)
        except TypeError:
            # On old versions of VTK, the signature used to be different
            self.cellpicker.pick((float(x), float(y), 0.0),
                                 self.renwin.renderer)

        cp = self.cellpicker
        id = cp.cell_id
        picked_data = PickedData()
        coord = cp.pick_position
        picked_data.coordinate = coord

        if id > -1:
            data = cp.mapper.input.cell_data
            bounds = cp.mapper.input.bounds

            picked_data.valid = 1
            picked_data.cell_id = id
            picked_data.data = data

            self._update_actor(coord, bounds)
        else:
            self.p_actor.visibility = 0

        self.renwin.render()
        return picked_data

    def pick_world(self, x, y):
        """ Picks a world point and probes for data there. Returns a
        `PickedData` instance."""
        self.worldpicker.pick((float(x), float(y), 0.0), self.renwin.renderer)

        # Use the cell picker to get the data that needs to be probed.
        self.cellpicker.pick( (float(x), float(y), 0.0), self.renwin.renderer)

        wp = self.worldpicker
        cp = self.cellpicker
        coord = wp.pick_position
        self.probe_data.points = [list(coord)]
        picked_data = PickedData()
        picked_data.coordinate = coord

        if cp.mapper:
            data = get_last_input(cp.mapper.input)
            # Need to create the probe each time because otherwise it
            # does not seem to work properly.
            probe = tvtk.ProbeFilter()
            probe.source = data
            probe.input = self.probe_data
            probe.update()
            data = probe.output.point_data
            bounds = cp.mapper.input.bounds

            picked_data.valid = 1
            picked_data.world_pick = 1
            picked_data.point_id = 0
            picked_data.data = data

            self._update_actor(coord, bounds)
        else:
            self.p_actor.visibility = 0

        self.renwin.render()
        return picked_data

    def on_ui_close(self):
        """This method makes the picker actor invisible when the GUI
        dialog is closed."""
        self.p_actor.visibility = 0
        self.renwin.renderer.remove_actor(self.p_actor)
        self.ui = None

    #################################################################
    # Non-public interface.
    #################################################################
    def _tolerance_changed(self, val):
        """ Trait handler for the tolerance trait."""
        self.pointpicker.tolerance = val
        self.cellpicker.tolerance = val

    def _update_actor(self, coordinate, bounds):
        """Updates the actor by setting its position and scale."""
        dx = 0.3*(bounds[1]-bounds[0])
        dy = 0.3*(bounds[3]-bounds[2])
        dz = 0.3*(bounds[5]-bounds[4])
        scale = max(dx,dy,dz)
        self.p_source.origin = coordinate
        self.p_source.scale_factor = scale
        self.p_actor.visibility = 1

    def _setup_gui(self):
        """Pops up the GUI control widget."""
        # Popup the GUI control.
        if self.ui is None:
            self.ui = self.edit_traits()
            # Note that we add actors to the renderer rather than to
            # renwin to prevent event notifications on actor
            # additions.
            self.renwin.renderer.add_actor(self.p_actor)
        elif self.auto_raise:
            try:
                self.ui.control.Raise()
            except AttributeError:
                pass