/usr/lib/python2.7/dist-packages/chaco/overlays/databox.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 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 | from __future__ import with_statement
from traits.api import (Bool, Enum, Float, Int, CList, Property, Trait,
on_trait_change)
from enable.api import ColorTrait
from chaco.api import AbstractOverlay
class DataBox(AbstractOverlay):
"""
An overlay that is a box defined by data space coordinates. This can be
used as a base class for various kinds of zoom boxes. Unlike the
"momentary" zoom box drawn for the ZoomTool, a ZoomBox is a more permanent
visual component.
"""
data_position = Property
data_bounds = Property
# Should the zoom box stay attached to the image or to the screen if the
# component moves underneath it?
# TODO: This basically works, but the problem is that it responds to both
# changes in X and Y independently. The DataRange2D needs to be updated
# to reflect changes from its two DataRange1Ds. The PanTool and ZoomTool
# need to be improved that they change both dimensions at once.
affinity = Enum("image", "screen")
#-------------------------------------------------------------------------
# Appearance properties (for Box mode)
#-------------------------------------------------------------------------
# The color of the selection box.
color = ColorTrait("lightskyblue")
# The alpha value to apply to **color** when filling in the selection
# region. Because it is almost certainly useless to have an opaque zoom
# rectangle, but it's also extremely useful to be able to use the normal
# named colors from Enable, this attribute allows the specification of a
# separate alpha value that replaces the alpha value of **color** at draw
# time.
alpha = Trait(0.3, None, Float)
# The color of the outside selection rectangle.
border_color = ColorTrait("dodgerblue")
# The thickness of selection rectangle border.
border_size = Int(1)
#-------------------------------------------------------------------------
# Private Traits
#-------------------------------------------------------------------------
_data_position = CList([0,0])
_data_bounds = CList([0,0])
_position_valid = False
_bounds_valid = False
# Are we in the middle of an event handler or a property setter
_updating = Bool(False)
def __init__(self, *args, **kw):
super(DataBox, self).__init__(*args, **kw)
if hasattr(self.component, "range2d"):
self.component.range2d._xrange.on_trait_change(self.my_component_moved, "updated")
self.component.range2d._yrange.on_trait_change(self.my_component_moved, "updated")
elif hasattr(self.component, "x_mapper") and hasattr(self.component, "y_mapper"):
self.component.x_mapper.range.on_trait_change(self.my_component_moved, "updated")
self.component.y_mapper.range.on_trait_change(self.my_component_moved, "updated")
else:
raise RuntimeError("DataBox cannot find a suitable mapper on its component.")
self.component.on_trait_change(self.my_component_resized, "bounds")
self.component.on_trait_change(self.my_component_resized, "bounds_items")
def overlay(self, component, gc, view_bounds=None, mode="normal"):
if not self._position_valid:
tmp = self.component.map_screen([self._data_position])
if len(tmp.shape) == 2:
tmp = tmp[0]
self._updating = True
self.position = tmp
self._updating = False
self._position_valid = True
if not self._bounds_valid:
data_x2 = self._data_position[0] + self._data_bounds[0]
data_y2 = self._data_position[1] + self._data_bounds[1]
tmp = self.component.map_screen((data_x2, data_y2))
if len(tmp.shape) == 2:
tmp = tmp[0]
x2, y2 = tmp
x, y = self.position
self._updating = True
self.bounds = [x2 - x, y2 - y]
self._updating = False
self._bounds_valid = True
with gc:
gc.set_antialias(0)
gc.set_line_width(self.border_size)
gc.set_stroke_color(self.border_color_)
gc.clip_to_rect(component.x, component.y, component.width, component.height)
rect = self.position + self.bounds
if self.color != "transparent":
if self.alpha:
color = list(self.color_)
if len(color) == 4:
color[3] = self.alpha
else:
color += [self.alpha]
else:
color = self.color_
gc.set_fill_color(color)
gc.rect(*rect)
gc.draw_path()
else:
gc.rect(*rect)
gc.stroke_path()
return
#-------------------------------------------------------------------------
# Property setters/getters, event handlers
#-------------------------------------------------------------------------
def _get_data_position(self):
return self._data_position
def _set_data_position(self, val):
self._data_position = val
self._position_valid = False
self.trait_property_changed("data_position", self._data_position)
def _get_data_bounds(self):
return self._data_bounds
def _set_data_bounds(self, val):
self._data_bounds = val
self._bounds_valid = False
self.trait_property_changed("data_bounds", self._data_bounds)
@on_trait_change('position,position_items')
def _update_position(self):
if self._updating:
return
tmp = self.component.map_data(self.position)
if len(tmp.shape) == 2:
tmp = tmp.T[0]
self._data_position = tmp
self.trait_property_changed("data_position", self._data_position)
@on_trait_change('bounds,bounds_items')
def _update_bounds(self):
if self._updating:
return
data_x2, data_y2 = self.component.map_data((self.x2, self.y2))
data_pos = self._data_position
self._data_bounds = [data_x2 - data_pos[0], data_y2 - data_pos[1]]
self.trait_property_changed("data_bounds", self._data_bounds)
def my_component_moved(self):
if self.affinity == "screen":
# If we have screen affinity, then we need to take our current position
# and map that back down into data coords
self._update_position()
self._update_bounds()
self._bounds_valid = False
self._position_valid = False
def my_component_resized(self):
self._bounds_valid = False
self._position_valid = False
|