/usr/lib/python2.7/dist-packages/chaco/tools/range_selection_2d.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 | """ Defines the RangeSelection controller class.
"""
# Major library imports
import numpy
# Chaco imports
from range_selection import RangeSelection
class RangeSelection2D(RangeSelection):
""" Selects a range along the index or value axis for plots on 2D data,
such as image plots
The user right-click-drags to select a region, which stays selected until
the user left-clicks to deselect.
"""
#------------------------------------------------------------------------
# Event handlers for the "selected" event state
#------------------------------------------------------------------------
def selected_left_down(self, event):
""" Handles the left mouse button being pressed when the tool is in
the 'selected' state.
If the user is allowed to resize the selection, and the event occurred
within the resize margin of an endpoint, then the tool switches to the
'selecting' state so that the user can resize the selection.
If the event is within the bounds of the selection region, then the tool
switches to the 'moving' states.
Otherwise, the selection becomes deselected.
"""
screen_bounds = self._get_selection_screencoords()
if screen_bounds is None:
self.deselect(event)
return
low = min(screen_bounds)
high = max(screen_bounds)
tmp = (event.x, event.y)
ndx = self._determine_axis()
mouse_coord = tmp[ndx]
if self.enable_resize:
if (abs(mouse_coord - high) <= self.resize_margin) or \
(abs(mouse_coord - low) <= self.resize_margin):
return self.selected_right_down(event)
if tmp[self.axis_index] >= low and tmp[self.axis_index] <= high:
self.event_state = "moving"
self._down_point = numpy.array([event.x, event.y])
self._down_data_coord = self._map_data([self._down_point])[0][self.axis_index]
self._original_selection = numpy.array(self.selection)
elif self.allow_deselection:
self.deselect(event)
else:
# Treat this as a combination deselect + left down
self.deselect(event)
self.normal_left_down(event)
event.handled = True
return
def selected_right_down(self, event):
""" Handles the right mouse button being pressed when the tool is in
the 'selected' state.
If the user is allowed to resize the selection, and the event occurred
within the resize margin of an endpoint, then the tool switches to the
'selecting' state so that the user can resize the selection.
Otherwise, the selection becomes deselected, and a new selection is
started..
"""
if self.enable_resize:
coords = self._get_selection_screencoords()
if coords is not None:
start, end = coords
tmp = (event.x, event.y)
ndx = self._determine_axis()
mouse_coord = tmp[ndx]
# We have to do a little swapping; the "end" point
# is always what gets updated, so if the user
# clicked on the starting point, we have to reverse
# the sense of the selection.
if abs(mouse_coord - end) <= self.resize_margin:
self.event_state = "selecting"
self._drag_edge = "high"
self.selecting_mouse_move(event)
elif abs(mouse_coord - start) <= self.resize_margin:
self.event_state = "selecting"
self._drag_edge = "low"
self.selecting_mouse_move(event)
elif self.allow_deselection:
self.deselect(event)
else:
# Treat this as a combination deselect + right down
self.deselect(event)
self.normal_right_down(event)
else:
# Treat this as a combination deselect + right down
self.deselect(event)
self.normal_right_down(event)
event.handled = True
return
def selected_mouse_move(self, event):
""" Handles the mouse moving when the tool is in the 'selected' state.
If the user is allowed to resize the selection, and the event
occurred within the resize margin of an endpoint, then the cursor
changes to indicate that the selection could be resized.
Otherwise, the cursor is set to an arrow.
"""
if self.enable_resize:
# Change the mouse cursor when the user moves within the resize margin
coords = self._get_selection_screencoords()
if coords is not None:
start, end = coords
tmp = (event.x, event.y)
ndx = self._determine_axis()
mouse_coord = tmp[ndx]
if abs(mouse_coord - end) <= self.resize_margin or \
abs(mouse_coord - start) <= self.resize_margin:
self._set_sizing_cursor(event)
return
event.window.set_pointer("arrow")
event.handled = True
return
#------------------------------------------------------------------------
# Event handlers for the "moving" event state
#------------------------------------------------------------------------
def moving_mouse_move(self, event):
""" Handles the mouse moving when the tool is in the 'moving' state.
Moves the selection range by an amount corresponding to the amount
that the mouse has moved since its button was pressed. If the new
selection range overlaps the endpoints of the data, it is truncated to
that endpoint.
"""
cur_point = numpy.array([event.x, event.y])
cur_data_point = self._map_data([cur_point])[0]
original_selection = self._original_selection
new_selection = original_selection + (cur_data_point[self.axis_index] \
- self._down_data_coord)
selection_data_width = original_selection[1] - original_selection[0]
range = self.mapper.range
range_low = range.low[self.axis_index]
range_high = range.high[self.axis_index]
if min(new_selection) < range_low:
new_selection = (range_low, range_low + selection_data_width)
elif max(new_selection) > range_high:
new_selection = (range_high - selection_data_width, range_high)
self.selection = new_selection
self.selection_completed = new_selection
self.component.request_redraw()
event.handled = True
return
#------------------------------------------------------------------------
# Event handlers for the "normal" event state
#------------------------------------------------------------------------
def normal_right_down(self, event):
""" Handles the right mouse button being pressed when the tool is in
the 'normal' state.
Puts the tool into 'selecting' mode, changes the cursor to show that it
is selecting, and starts defining the selection.
"""
x_pos = self._get_axis_coord(event, "index")
y_pos = self._get_axis_coord(event, "value")
self._down_point = numpy.array([x_pos, y_pos])
mapped_pos = self._map_data([(x_pos,y_pos)])[0][self.axis_index]
self.selection = (mapped_pos, mapped_pos)
self._set_sizing_cursor(event)
self.event_state = "selecting"
self.selecting_mouse_move(event)
return
#------------------------------------------------------------------------
# Event handlers for the "selecting" event state
#------------------------------------------------------------------------
def selecting_mouse_move(self, event):
""" Handles the mouse being moved when the tool is in the 'selecting'
state.
Expands the selection range at the appropriate end, based on the new
mouse position.
"""
if self.selection is not None:
axis_index = self.axis_index
low = self.plot.position[axis_index]
high = low + self.plot.bounds[axis_index] - 1
tmp = self._get_axis_coord(event)
if tmp >= low and tmp <= high:
x_pos = self._get_axis_coord(event, "index")
y_pos = self._get_axis_coord(event, "value")
new_edge = self._map_data([(x_pos,y_pos)])[0][self.axis_index]
if self._drag_edge == "high":
low_val = self.selection[0]
# the selection should be a range consisting of 2 points,
# if it appears that only 1 point is selected, move one
# edge over a pixel
if new_edge == low_val:
new_edge = self._map_data([(x_pos+1,y_pos+1)])[0][self.axis_index]
if new_edge > low_val:
self.selection = (low_val, new_edge)
else:
self.selection = (new_edge, low_val)
self._drag_edge = "low"
else:
high_val = self.selection[1]
# the selection should be a range consisting of 2 points,
# if it appears that only 1 point is selected, move one
# edge over a pixel
if new_edge == high_val:
new_edge = self._map_data([(x_pos-1,y_pos-1)])[0][self.axis_index]
if new_edge < high_val:
self.selection = (new_edge, high_val)
else:
self.selection = (high_val, new_edge)
self._drag_edge = "high"
self.component.request_redraw()
event.handled = True
return
def selecting_mouse_leave(self, event):
""" Handles the mouse leaving the plot when the tool is in the
'selecting' state.
Determines whether the event's position is outside the component's
bounds, and if so, clips the selection. Sets the cursor to an arrow.
"""
axis_index = self.axis_index
low = self.plot.position[axis_index]
high = low + self.plot.bounds[axis_index] - 1
old_selection = self.selection
selection_low = old_selection[0]
selection_high = old_selection[1]
pos = self._get_axis_coord(event)
if pos >= high:
if self.axis == 'index':
selection_high = self._map_data([(high, 0)])[0][self.axis_index]
else:
selection_high = self._map_data([(0, high)])[0][self.axis_index]
elif pos <= low:
if self.axis == 'index':
selection_low = self._map_data([(low, 0)])[0][self.axis_index]
else:
selection_low = self._map_data([(0, low)])[0][self.axis_index]
self.selection = (selection_low, selection_high)
event.window.set_pointer("arrow")
self.component.request_redraw()
return
#------------------------------------------------------------------------
# Private methods
#------------------------------------------------------------------------
def _map_data(self, screen_pts):
return self.mapper.map_data(screen_pts)
def _map_screen(self, data_pts):
return self.mapper.map_screen(data_pts)
def _get_selection_screencoords(self):
""" Returns a tuple of (x1, x2) screen space coordinates of the start
and end selection points.
If there is no current selection, then it returns None.
"""
selection = self.selection
if selection is not None and len(selection) == 2:
if self.axis == 'index':
return [x for x,y in self._map_screen([(x,0) for x in self.selection])]
else:
return [y for x,y in self._map_screen([(0,y) for y in self.selection])]
else:
return None
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