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"""
Displaying large NumPy arrays with TabularEditor
A demonstration of how the TabularEditor can be used to display (large) NumPy
arrays, in this case 100,000 random 3D points from a unit cube.
In addition to showing the coordinates of each point, it also displays the
index of each point in the array, as well as a red flag if the point lies within
0.25 of the center of the cube.
"""
#-- Imports --------------------------------------------------------------
from __future__ import absolute_import
from numpy import sqrt
from numpy.random import random
from traits.api import HasTraits, Property, Array, Font
from traitsui.api import View, Item, TabularEditor
from traitsui.tabular_adapter import TabularAdapter
#-- Tabular Adapter Definition -------------------------------------------
class ArrayAdapter(TabularAdapter):
columns = [('i', 'index'), ('x', 0), ('y', 1), ('z', 2)]
# Font fails with wx in OSX; see traitsui issue #13:
# font = Font('Courier 10')
alignment = 'right'
format = '%.4f'
index_text = Property
index_image = Property
def _get_index_text(self):
return str(self.row)
def _get_index_image(self):
x, y, z = self.item
if sqrt((x - 0.5) ** 2 + (y - 0.5) ** 2 + (z - 0.5) ** 2) <= 0.25:
return '@icons:red_ball'
return None
#-- ShowArray Class Definition -------------------------------------------
class ShowArray(HasTraits):
data = Array
view = View(
Item('data',
show_label=False,
style='readonly',
editor=TabularEditor(adapter=ArrayAdapter())
),
title='Array Viewer',
width=0.3,
height=0.8,
resizable=True
)
# Create the demo:
demo = ShowArray(data=random((100000, 3)))
# Run the demo (if invoked from the command line):
if __name__ == '__main__':
demo.configure_traits()
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