/usr/lib/python3/dist-packages/matplotlib/backend_tools.py is in python3-matplotlib 1.5.1-1ubuntu1.
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Abstract base classes define the primitives for Tools.
These tools are used by `matplotlib.backend_managers.ToolManager`
:class:`ToolBase`
Simple stateless tool
:class:`ToolToggleBase`
Tool that has two states, only one Toggle tool can be
active at any given time for the same
`matplotlib.backend_managers.ToolManager`
"""
from matplotlib import rcParams
from matplotlib._pylab_helpers import Gcf
import matplotlib.cbook as cbook
from weakref import WeakKeyDictionary
import numpy as np
from matplotlib.externals import six
import warnings
class Cursors(object):
"""Simple namespace for cursor reference"""
HAND, POINTER, SELECT_REGION, MOVE = list(range(4))
cursors = Cursors()
# Views positions tool
_views_positions = 'viewpos'
class ToolBase(object):
"""
Base tool class
A base tool, only implements `trigger` method or not method at all.
The tool is instantiated by `matplotlib.backend_managers.ToolManager`
Attributes
----------
toolmanager: `matplotlib.backend_managers.ToolManager`
ToolManager that controls this Tool
figure: `FigureCanvas`
Figure instance that is affected by this Tool
name: String
Used as **Id** of the tool, has to be unique among tools of the same
ToolManager
"""
default_keymap = None
"""
Keymap to associate with this tool
**String**: List of comma separated keys that will be used to call this
tool when the keypress event of *self.figure.canvas* is emited
"""
description = None
"""
Description of the Tool
**String**: If the Tool is included in the Toolbar this text is used
as a Tooltip
"""
image = None
"""
Filename of the image
**String**: Filename of the image to use in the toolbar. If None, the
`name` is used as a label in the toolbar button
"""
def __init__(self, toolmanager, name):
warnings.warn('Treat the new Tool classes introduced in v1.5 as ' +
'experimental for now, the API will likely change in ' +
'version 2.1, and some tools might change name')
self._name = name
self._figure = None
self.toolmanager = toolmanager
self.figure = toolmanager.canvas.figure
@property
def figure(self):
return self._figure
def trigger(self, sender, event, data=None):
"""
Called when this tool gets used
This method is called by
`matplotlib.backend_managers.ToolManager.trigger_tool`
Parameters
----------
event: `Event`
The Canvas event that caused this tool to be called
sender: object
Object that requested the tool to be triggered
data: object
Extra data
"""
pass
@figure.setter
def figure(self, figure):
"""
Set the figure
Set the figure to be affected by this tool
Parameters
----------
figure: `Figure`
"""
self._figure = figure
@property
def name(self):
"""Tool Id"""
return self._name
def destroy(self):
"""
Destroy the tool
This method is called when the tool is removed by
`matplotlib.backend_managers.ToolManager.remove_tool`
"""
pass
class ToolToggleBase(ToolBase):
"""
Toggleable tool
Every time it is triggered, it switches between enable and disable
"""
radio_group = None
"""Attribute to group 'radio' like tools (mutually exclusive)
**String** that identifies the group or **None** if not belonging to a
group
"""
cursor = None
"""Cursor to use when the tool is active"""
def __init__(self, *args, **kwargs):
ToolBase.__init__(self, *args, **kwargs)
self._toggled = False
def trigger(self, sender, event, data=None):
"""Calls `enable` or `disable` based on `toggled` value"""
if self._toggled:
self.disable(event)
else:
self.enable(event)
self._toggled = not self._toggled
def enable(self, event=None):
"""
Enable the toggle tool
`trigger` calls this method when `toggled` is False
"""
pass
def disable(self, event=None):
"""
Disable the toggle tool
`trigger` call this method when `toggled` is True.
This can happen in different circumstances
* Click on the toolbar tool button
* Call to `matplotlib.backend_managers.ToolManager.trigger_tool`
* Another `ToolToggleBase` derived tool is triggered
(from the same `ToolManager`)
"""
pass
@property
def toggled(self):
"""State of the toggled tool"""
return self._toggled
class SetCursorBase(ToolBase):
"""
Change to the current cursor while inaxes
This tool, keeps track of all `ToolToggleBase` derived tools, and calls
set_cursor when a tool gets triggered
"""
def __init__(self, *args, **kwargs):
ToolBase.__init__(self, *args, **kwargs)
self._idDrag = self.figure.canvas.mpl_connect(
'motion_notify_event', self._set_cursor_cbk)
self._cursor = None
self._default_cursor = cursors.POINTER
self._last_cursor = self._default_cursor
self.toolmanager.toolmanager_connect('tool_added_event',
self._add_tool_cbk)
# process current tools
for tool in self.toolmanager.tools.values():
self._add_tool(tool)
def _tool_trigger_cbk(self, event):
if event.tool.toggled:
self._cursor = event.tool.cursor
else:
self._cursor = None
self._set_cursor_cbk(event.canvasevent)
def _add_tool(self, tool):
"""set the cursor when the tool is triggered"""
if getattr(tool, 'cursor', None) is not None:
self.toolmanager.toolmanager_connect('tool_trigger_%s' % tool.name,
self._tool_trigger_cbk)
def _add_tool_cbk(self, event):
"""Process every newly added tool"""
if event.tool is self:
return
self._add_tool(event.tool)
def _set_cursor_cbk(self, event):
if not event:
return
if not getattr(event, 'inaxes', False) or not self._cursor:
if self._last_cursor != self._default_cursor:
self.set_cursor(self._default_cursor)
self._last_cursor = self._default_cursor
elif self._cursor:
cursor = self._cursor
if cursor and self._last_cursor != cursor:
self.set_cursor(cursor)
self._last_cursor = cursor
def set_cursor(self, cursor):
"""
Set the cursor
This method has to be implemented per backend
"""
raise NotImplementedError
class ToolCursorPosition(ToolBase):
"""
Send message with the current pointer position
This tool runs in the background reporting the position of the cursor
"""
def __init__(self, *args, **kwargs):
ToolBase.__init__(self, *args, **kwargs)
self._idDrag = self.figure.canvas.mpl_connect(
'motion_notify_event', self.send_message)
def send_message(self, event):
"""Call `matplotlib.backend_managers.ToolManager.message_event`"""
if self.toolmanager.messagelock.locked():
return
message = ' '
if event.inaxes and event.inaxes.get_navigate():
try:
s = event.inaxes.format_coord(event.xdata, event.ydata)
except (ValueError, OverflowError):
pass
else:
message = s
self.toolmanager.message_event(message, self)
class RubberbandBase(ToolBase):
"""Draw and remove rubberband"""
def trigger(self, sender, event, data):
"""Call `draw_rubberband` or `remove_rubberband` based on data"""
if not self.figure.canvas.widgetlock.available(sender):
return
if data is not None:
self.draw_rubberband(*data)
else:
self.remove_rubberband()
def draw_rubberband(self, *data):
"""
Draw rubberband
This method must get implemented per backend
"""
raise NotImplementedError
def remove_rubberband(self):
"""
Remove rubberband
This method should get implemented per backend
"""
pass
class ToolQuit(ToolBase):
"""Tool to call the figure manager destroy method"""
description = 'Quit the figure'
default_keymap = rcParams['keymap.quit']
def trigger(self, sender, event, data=None):
Gcf.destroy_fig(self.figure)
class ToolEnableAllNavigation(ToolBase):
"""Tool to enable all axes for toolmanager interaction"""
description = 'Enables all axes toolmanager'
default_keymap = rcParams['keymap.all_axes']
def trigger(self, sender, event, data=None):
if event.inaxes is None:
return
for a in self.figure.get_axes():
if (event.x is not None and event.y is not None
and a.in_axes(event)):
a.set_navigate(True)
class ToolEnableNavigation(ToolBase):
"""Tool to enable a specific axes for toolmanager interaction"""
description = 'Enables one axes toolmanager'
default_keymap = (1, 2, 3, 4, 5, 6, 7, 8, 9)
def trigger(self, sender, event, data=None):
if event.inaxes is None:
return
n = int(event.key) - 1
for i, a in enumerate(self.figure.get_axes()):
if (event.x is not None and event.y is not None
and a.in_axes(event)):
a.set_navigate(i == n)
class ToolGrid(ToolToggleBase):
"""Tool to toggle the grid of the figure"""
description = 'Toogle Grid'
default_keymap = rcParams['keymap.grid']
def trigger(self, sender, event, data=None):
if event.inaxes is None:
return
ToolToggleBase.trigger(self, sender, event, data)
def enable(self, event):
event.inaxes.grid(True)
self.figure.canvas.draw_idle()
def disable(self, event):
event.inaxes.grid(False)
self.figure.canvas.draw_idle()
class ToolFullScreen(ToolToggleBase):
"""Tool to toggle full screen"""
description = 'Toogle Fullscreen mode'
default_keymap = rcParams['keymap.fullscreen']
def enable(self, event):
self.figure.canvas.manager.full_screen_toggle()
def disable(self, event):
self.figure.canvas.manager.full_screen_toggle()
class AxisScaleBase(ToolToggleBase):
"""Base Tool to toggle between linear and logarithmic"""
def trigger(self, sender, event, data=None):
if event.inaxes is None:
return
ToolToggleBase.trigger(self, sender, event, data)
def enable(self, event):
self.set_scale(event.inaxes, 'log')
self.figure.canvas.draw_idle()
def disable(self, event):
self.set_scale(event.inaxes, 'linear')
self.figure.canvas.draw_idle()
class ToolYScale(AxisScaleBase):
"""Tool to toggle between linear and logarithmic scales on the Y axis"""
description = 'Toogle Scale Y axis'
default_keymap = rcParams['keymap.yscale']
def set_scale(self, ax, scale):
ax.set_yscale(scale)
class ToolXScale(AxisScaleBase):
"""Tool to toggle between linear and logarithmic scales on the X axis"""
description = 'Toogle Scale X axis'
default_keymap = rcParams['keymap.xscale']
def set_scale(self, ax, scale):
ax.set_xscale(scale)
class ToolViewsPositions(ToolBase):
"""
Auxiliary Tool to handle changes in views and positions
Runs in the background and should get used by all the tools that
need to access the figure's history of views and positions, e.g.
* `ToolZoom`
* `ToolPan`
* `ToolHome`
* `ToolBack`
* `ToolForward`
"""
def __init__(self, *args, **kwargs):
self.views = WeakKeyDictionary()
self.positions = WeakKeyDictionary()
ToolBase.__init__(self, *args, **kwargs)
def add_figure(self):
"""Add the current figure to the stack of views and positions"""
if self.figure not in self.views:
self.views[self.figure] = cbook.Stack()
self.positions[self.figure] = cbook.Stack()
# Define Home
self.push_current()
# Adding the clear method as axobserver, removes this burden from
# the backend
self.figure.add_axobserver(self.clear)
def clear(self, figure):
"""Reset the axes stack"""
if figure in self.views:
self.views[figure].clear()
self.positions[figure].clear()
def update_view(self):
"""
Update the viewlim and position from the view and
position stack for each axes
"""
views = self.views[self.figure]()
if views is None:
return
pos = self.positions[self.figure]()
if pos is None:
return
for i, a in enumerate(self.figure.get_axes()):
a._set_view(views[i])
# Restore both the original and modified positions
a.set_position(pos[i][0], 'original')
a.set_position(pos[i][1], 'active')
self.figure.canvas.draw_idle()
def push_current(self):
"""push the current view limits and position onto the stack"""
views = []
pos = []
for a in self.figure.get_axes():
views.append(a._get_view())
# Store both the original and modified positions
pos.append((
a.get_position(True).frozen(),
a.get_position().frozen()))
self.views[self.figure].push(views)
self.positions[self.figure].push(pos)
def refresh_locators(self):
"""Redraw the canvases, update the locators"""
for a in self.figure.get_axes():
xaxis = getattr(a, 'xaxis', None)
yaxis = getattr(a, 'yaxis', None)
zaxis = getattr(a, 'zaxis', None)
locators = []
if xaxis is not None:
locators.append(xaxis.get_major_locator())
locators.append(xaxis.get_minor_locator())
if yaxis is not None:
locators.append(yaxis.get_major_locator())
locators.append(yaxis.get_minor_locator())
if zaxis is not None:
locators.append(zaxis.get_major_locator())
locators.append(zaxis.get_minor_locator())
for loc in locators:
loc.refresh()
self.figure.canvas.draw_idle()
def home(self):
"""Recall the first view and position from the stack"""
self.views[self.figure].home()
self.positions[self.figure].home()
def back(self):
"""Back one step in the stack of views and positions"""
self.views[self.figure].back()
self.positions[self.figure].back()
def forward(self):
"""Forward one step in the stack of views and positions"""
self.views[self.figure].forward()
self.positions[self.figure].forward()
class ViewsPositionsBase(ToolBase):
"""Base class for `ToolHome`, `ToolBack` and `ToolForward`"""
_on_trigger = None
def trigger(self, sender, event, data=None):
self.toolmanager.get_tool(_views_positions).add_figure()
getattr(self.toolmanager.get_tool(_views_positions),
self._on_trigger)()
self.toolmanager.get_tool(_views_positions).update_view()
class ToolHome(ViewsPositionsBase):
"""Restore the original view lim"""
description = 'Reset original view'
image = 'home.png'
default_keymap = rcParams['keymap.home']
_on_trigger = 'home'
class ToolBack(ViewsPositionsBase):
"""Move back up the view lim stack"""
description = 'Back to previous view'
image = 'back.png'
default_keymap = rcParams['keymap.back']
_on_trigger = 'back'
class ToolForward(ViewsPositionsBase):
"""Move forward in the view lim stack"""
description = 'Forward to next view'
image = 'forward.png'
default_keymap = rcParams['keymap.forward']
_on_trigger = 'forward'
class ConfigureSubplotsBase(ToolBase):
"""Base tool for the configuration of subplots"""
description = 'Configure subplots'
image = 'subplots.png'
class SaveFigureBase(ToolBase):
"""Base tool for figure saving"""
description = 'Save the figure'
image = 'filesave.png'
default_keymap = rcParams['keymap.save']
class ZoomPanBase(ToolToggleBase):
"""Base class for `ToolZoom` and `ToolPan`"""
def __init__(self, *args):
ToolToggleBase.__init__(self, *args)
self._button_pressed = None
self._xypress = None
self._idPress = None
self._idRelease = None
self._idScroll = None
self.base_scale = 2.
def enable(self, event):
"""Connect press/release events and lock the canvas"""
self.figure.canvas.widgetlock(self)
self._idPress = self.figure.canvas.mpl_connect(
'button_press_event', self._press)
self._idRelease = self.figure.canvas.mpl_connect(
'button_release_event', self._release)
self._idScroll = self.figure.canvas.mpl_connect(
'scroll_event', self.scroll_zoom)
def disable(self, event):
"""Release the canvas and disconnect press/release events"""
self._cancel_action()
self.figure.canvas.widgetlock.release(self)
self.figure.canvas.mpl_disconnect(self._idPress)
self.figure.canvas.mpl_disconnect(self._idRelease)
self.figure.canvas.mpl_disconnect(self._idScroll)
def trigger(self, sender, event, data=None):
self.toolmanager.get_tool(_views_positions).add_figure()
ToolToggleBase.trigger(self, sender, event, data)
def scroll_zoom(self, event):
# https://gist.github.com/tacaswell/3144287
if event.inaxes is None:
return
ax = event.inaxes
cur_xlim = ax.get_xlim()
cur_ylim = ax.get_ylim()
# set the range
cur_xrange = (cur_xlim[1] - cur_xlim[0])*.5
cur_yrange = (cur_ylim[1] - cur_ylim[0])*.5
xdata = event.xdata # get event x location
ydata = event.ydata # get event y location
if event.button == 'up':
# deal with zoom in
scale_factor = 1 / self.base_scale
elif event.button == 'down':
# deal with zoom out
scale_factor = self.base_scale
else:
# deal with something that should never happen
scale_factor = 1
# set new limits
ax.set_xlim([xdata - cur_xrange*scale_factor,
xdata + cur_xrange*scale_factor])
ax.set_ylim([ydata - cur_yrange*scale_factor,
ydata + cur_yrange*scale_factor])
self.figure.canvas.draw_idle() # force re-draw
class ToolZoom(ZoomPanBase):
"""Zoom to rectangle"""
description = 'Zoom to rectangle'
image = 'zoom_to_rect.png'
default_keymap = rcParams['keymap.zoom']
cursor = cursors.SELECT_REGION
radio_group = 'default'
def __init__(self, *args):
ZoomPanBase.__init__(self, *args)
self._ids_zoom = []
def _cancel_action(self):
for zoom_id in self._ids_zoom:
self.figure.canvas.mpl_disconnect(zoom_id)
self.toolmanager.trigger_tool('rubberband', self)
self.toolmanager.get_tool(_views_positions).refresh_locators()
self._xypress = None
self._button_pressed = None
self._ids_zoom = []
return
def _press(self, event):
"""the _press mouse button in zoom to rect mode callback"""
# If we're already in the middle of a zoom, pressing another
# button works to "cancel"
if self._ids_zoom != []:
self._cancel_action()
if event.button == 1:
self._button_pressed = 1
elif event.button == 3:
self._button_pressed = 3
else:
self._cancel_action()
return
x, y = event.x, event.y
self._xypress = []
for i, a in enumerate(self.figure.get_axes()):
if (x is not None and y is not None and a.in_axes(event) and
a.get_navigate() and a.can_zoom()):
self._xypress.append((x, y, a, i, a._get_view()))
id1 = self.figure.canvas.mpl_connect(
'motion_notify_event', self._mouse_move)
id2 = self.figure.canvas.mpl_connect(
'key_press_event', self._switch_on_zoom_mode)
id3 = self.figure.canvas.mpl_connect(
'key_release_event', self._switch_off_zoom_mode)
self._ids_zoom = id1, id2, id3
self._zoom_mode = event.key
def _switch_on_zoom_mode(self, event):
self._zoom_mode = event.key
self._mouse_move(event)
def _switch_off_zoom_mode(self, event):
self._zoom_mode = None
self._mouse_move(event)
def _mouse_move(self, event):
"""the drag callback in zoom mode"""
if self._xypress:
x, y = event.x, event.y
lastx, lasty, a, _ind, _view = self._xypress[0]
# adjust x, last, y, last
x1, y1, x2, y2 = a.bbox.extents
x, lastx = max(min(x, lastx), x1), min(max(x, lastx), x2)
y, lasty = max(min(y, lasty), y1), min(max(y, lasty), y2)
if self._zoom_mode == "x":
x1, y1, x2, y2 = a.bbox.extents
y, lasty = y1, y2
elif self._zoom_mode == "y":
x1, y1, x2, y2 = a.bbox.extents
x, lastx = x1, x2
self.toolmanager.trigger_tool('rubberband',
self,
data=(x, y, lastx, lasty))
def _release(self, event):
"""the release mouse button callback in zoom to rect mode"""
for zoom_id in self._ids_zoom:
self.figure.canvas.mpl_disconnect(zoom_id)
self._ids_zoom = []
if not self._xypress:
self._cancel_action()
return
last_a = []
for cur_xypress in self._xypress:
x, y = event.x, event.y
lastx, lasty, a, _ind, view = cur_xypress
# ignore singular clicks - 5 pixels is a threshold
if abs(x - lastx) < 5 or abs(y - lasty) < 5:
self._cancel_action()
return
# detect twinx,y axes and avoid double zooming
twinx, twiny = False, False
if last_a:
for la in last_a:
if a.get_shared_x_axes().joined(a, la):
twinx = True
if a.get_shared_y_axes().joined(a, la):
twiny = True
last_a.append(a)
if self._button_pressed == 1:
direction = 'in'
elif self._button_pressed == 3:
direction = 'out'
else:
continue
a._set_view_from_bbox((lastx, lasty, x, y), direction,
self._zoom_mode, twinx, twiny)
self._zoom_mode = None
self.toolmanager.get_tool(_views_positions).push_current()
self._cancel_action()
class ToolPan(ZoomPanBase):
"""Pan axes with left mouse, zoom with right"""
default_keymap = rcParams['keymap.pan']
description = 'Pan axes with left mouse, zoom with right'
image = 'move.png'
cursor = cursors.MOVE
radio_group = 'default'
def __init__(self, *args):
ZoomPanBase.__init__(self, *args)
self._idDrag = None
def _cancel_action(self):
self._button_pressed = None
self._xypress = []
self.figure.canvas.mpl_disconnect(self._idDrag)
self.toolmanager.messagelock.release(self)
self.toolmanager.get_tool(_views_positions).refresh_locators()
def _press(self, event):
if event.button == 1:
self._button_pressed = 1
elif event.button == 3:
self._button_pressed = 3
else:
self._cancel_action()
return
x, y = event.x, event.y
self._xypress = []
for i, a in enumerate(self.figure.get_axes()):
if (x is not None and y is not None and a.in_axes(event) and
a.get_navigate() and a.can_pan()):
a.start_pan(x, y, event.button)
self._xypress.append((a, i))
self.toolmanager.messagelock(self)
self._idDrag = self.figure.canvas.mpl_connect(
'motion_notify_event', self._mouse_move)
def _release(self, event):
if self._button_pressed is None:
self._cancel_action()
return
self.figure.canvas.mpl_disconnect(self._idDrag)
self.toolmanager.messagelock.release(self)
for a, _ind in self._xypress:
a.end_pan()
if not self._xypress:
self._cancel_action()
return
self.toolmanager.get_tool(_views_positions).push_current()
self._cancel_action()
def _mouse_move(self, event):
for a, _ind in self._xypress:
# safer to use the recorded button at the _press than current
# button: # multiple button can get pressed during motion...
a.drag_pan(self._button_pressed, event.key, event.x, event.y)
self.toolmanager.canvas.draw_idle()
default_tools = {'home': ToolHome, 'back': ToolBack, 'forward': ToolForward,
'zoom': ToolZoom, 'pan': ToolPan,
'subplots': 'ToolConfigureSubplots',
'save': 'ToolSaveFigure',
'grid': ToolGrid,
'fullscreen': ToolFullScreen,
'quit': ToolQuit,
'allnav': ToolEnableAllNavigation,
'nav': ToolEnableNavigation,
'xscale': ToolXScale,
'yscale': ToolYScale,
'position': ToolCursorPosition,
_views_positions: ToolViewsPositions,
'cursor': 'ToolSetCursor',
'rubberband': 'ToolRubberband',
}
"""Default tools"""
default_toolbar_tools = [['navigation', ['home', 'back', 'forward']],
['zoompan', ['pan', 'zoom']],
['layout', ['subplots']],
['io', ['save']]]
"""Default tools in the toolbar"""
def add_tools_to_manager(toolmanager, tools=default_tools):
"""
Add multiple tools to `ToolManager`
Parameters
----------
toolmanager: ToolManager
`backend_managers.ToolManager` object that will get the tools added
tools : {str: class_like}, optional
The tools to add in a {name: tool} dict, see `add_tool` for more
info.
"""
for name, tool in six.iteritems(tools):
toolmanager.add_tool(name, tool)
def add_tools_to_container(container, tools=default_toolbar_tools):
"""
Add multiple tools to the container.
Parameters
----------
container: Container
`backend_bases.ToolContainerBase` object that will get the tools added
tools : list, optional
List in the form
[[group1, [tool1, tool2 ...]], [group2, [...]]]
Where the tools given by tool1, and tool2 will display in group1.
See `add_tool` for details.
"""
for group, grouptools in tools:
for position, tool in enumerate(grouptools):
container.add_tool(tool, group, position)
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