/usr/lib/python2.7/dist-packages/chaco/lasso_overlay.py is in python-chaco 4.5.0-1.
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 | """ Defines the LassoOverlay class.
"""
from __future__ import with_statement
from numpy import concatenate, newaxis
# Enthought library imports
from enable.api import ColorTrait, LineStyle
from traits.api import Float, Instance, Bool
# Local imports
from abstract_overlay import AbstractOverlay
class LassoOverlay(AbstractOverlay):
""" Draws a lasso selection region on top of a plot.
LassoOverlay gets its data from a LassoSelection.
"""
# The LassoSelection that provides the data for this overlay.
lasso_selection = Instance('chaco.tools.lasso_selection.LassoSelection')
# The fill color for the selection region.
selection_fill_color = ColorTrait('lightskyblue')
# The border color for the selection region.
selection_border_color = ColorTrait('dodgerblue')
# The transparency level for the selection fill color.
selection_alpha = Float(0.8)
# The width of the selection border.
selection_border_width = Float(2.0)
# The line style of the selection border.
selection_border_dash = LineStyle
# The background color (overrides AbstractOverlay).
bgcolor = 'clear'
# Whether to draw the lasso
# depends on the state of the lasso tool
_draw_selection = Bool(False)
def overlay(self, other_component, gc, view_bounds=None, mode="normal"):
""" Draws this component overlaid on another component.
Implements AbstractOverlay.
"""
if not self._draw_selection:
return
with gc:
c = other_component
gc.clip_to_rect(c.x, c.y, c.width, c.height)
self._draw_component(gc, view_bounds, mode)
return
def _updated_changed_for_lasso_selection(self):
self.component.invalidate_draw()
self.component.request_redraw()
def _event_state_fired_for_lasso_selection(self, val):
self._draw_selection = val == 'selecting'
self.component.invalidate_draw()
self.component.request_redraw()
def _draw_component(self, gc, view_bounds=None, mode='normal'):
""" Draws the component.
This method is preserved for backwards compatibility with _old_draw().
Overrides PlotComponent.
"""
with gc:
# We may need to make map_screen more flexible in the number of dimensions
# it accepts for ths to work well.
for selection in self.lasso_selection.disjoint_selections:
points = self.component.map_screen(selection)
if len(points) == 0:
return
points = concatenate((points, points[0, newaxis]), axis=0)
gc.set_line_width(self.selection_border_width)
gc.set_line_dash(self.selection_border_dash_)
gc.set_fill_color(self.selection_fill_color_)
gc.set_stroke_color(self.selection_border_color_)
gc.set_alpha(self.selection_alpha)
gc.lines(points)
gc.draw_path()
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