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/ widgets.py
"""
GUI neutral widgets
===================
Widgets that are designed to work for any of the GUI backends.
All of these widgets require you to predefine a :class:`matplotlib.axes.Axes`
instance and pass that as the first arg. matplotlib doesn't try to
be too smart with respect to layout -- you will have to figure out how
wide and tall you want your Axes to be to accommodate your widget.
"""
import copy
from numbers import Integral
import numpy as np
from . import cbook, rcParams
from .lines import Line2D
from .patches import Circle, Rectangle, Ellipse
from .transforms import blended_transform_factory
class LockDraw(object):
"""
Some widgets, like the cursor, draw onto the canvas, and this is not
desirable under all circumstances, like when the toolbar is in zoom-to-rect
mode and drawing a rectangle. To avoid this, a widget can acquire a
canvas' lock with ``canvas.widgetlock(widget)`` before drawing on the
canvas; this will prevent other widgets from doing so at the same time (if
they also try to acquire the lock first).
"""
def __init__(self):
self._owner = None
def __call__(self, o):
"""Reserve the lock for *o*."""
if not self.available(o):
raise ValueError('already locked')
self._owner = o
def release(self, o):
"""Release the lock from *o*."""
if not self.available(o):
raise ValueError('you do not own this lock')
self._owner = None
def available(self, o):
"""Return whether drawing is available to *o*."""
return not self.locked() or self.isowner(o)
def isowner(self, o):
"""Return whether *o* owns this lock."""
return self._owner is o
def locked(self):
"""Return whether the lock is currently held by an owner."""
return self._owner is not None
class Widget(object):
"""
Abstract base class for GUI neutral widgets
"""
drawon = True
eventson = True
_active = True
def set_active(self, active):
"""Set whether the widget is active.
"""
self._active = active
def get_active(self):
"""Get whether the widget is active.
"""
return self._active
# set_active is overridden by SelectorWidgets.
active = property(get_active, lambda self, active: self.set_active(active),
doc="Is the widget active?")
def ignore(self, event):
"""Return True if event should be ignored.
This method (or a version of it) should be called at the beginning
of any event callback.
"""
return not self.active
class AxesWidget(Widget):
"""Widget that is connected to a single
:class:`~matplotlib.axes.Axes`.
To guarantee that the widget remains responsive and not garbage-collected,
a reference to the object should be maintained by the user.
This is necessary because the callback registry
maintains only weak-refs to the functions, which are member
functions of the widget. If there are no references to the widget
object it may be garbage collected which will disconnect the
callbacks.
Attributes:
*ax* : :class:`~matplotlib.axes.Axes`
The parent axes for the widget
*canvas* : :class:`~matplotlib.backend_bases.FigureCanvasBase` subclass
The parent figure canvas for the widget.
*active* : bool
If False, the widget does not respond to events.
"""
def __init__(self, ax):
self.ax = ax
self.canvas = ax.figure.canvas
self.cids = []
def connect_event(self, event, callback):
"""Connect callback with an event.
This should be used in lieu of `figure.canvas.mpl_connect` since this
function stores callback ids for later clean up.
"""
cid = self.canvas.mpl_connect(event, callback)
self.cids.append(cid)
def disconnect_events(self):
"""Disconnect all events created by this widget."""
for c in self.cids:
self.canvas.mpl_disconnect(c)
class Button(AxesWidget):
"""
A GUI neutral button.
For the button to remain responsive you must keep a reference to it.
Call :meth:`on_clicked` to connect to the button.
Attributes
----------
ax
The :class:`matplotlib.axes.Axes` the button renders into.
label
A :class:`matplotlib.text.Text` instance.
color
The color of the button when not hovering.
hovercolor
The color of the button when hovering.
"""
def __init__(self, ax, label, image=None,
color='0.85', hovercolor='0.95'):
"""
Parameters
----------
ax : `~matplotlib.axes.Axes`
The `~.axes.Axes` instance the button will be placed into.
label : str
The button text. Accepts string.
image : array, mpl image, Pillow Image
The image to place in the button, if not *None*.
Can be any legal arg to imshow (numpy array,
matplotlib Image instance, or Pillow Image).
color : color
The color of the button when not activated.
hovercolor : color
The color of the button when the mouse is over it.
"""
AxesWidget.__init__(self, ax)
if image is not None:
ax.imshow(image)
self.label = ax.text(0.5, 0.5, label,
verticalalignment='center',
horizontalalignment='center',
transform=ax.transAxes)
self.cnt = 0
self.observers = {}
self.connect_event('button_press_event', self._click)
self.connect_event('button_release_event', self._release)
self.connect_event('motion_notify_event', self._motion)
ax.set_navigate(False)
ax.set_facecolor(color)
ax.set_xticks([])
ax.set_yticks([])
self.color = color
self.hovercolor = hovercolor
self._lastcolor = color
def _click(self, event):
if self.ignore(event):
return
if event.inaxes != self.ax:
return
if not self.eventson:
return
if event.canvas.mouse_grabber != self.ax:
event.canvas.grab_mouse(self.ax)
def _release(self, event):
if self.ignore(event):
return
if event.canvas.mouse_grabber != self.ax:
return
event.canvas.release_mouse(self.ax)
if not self.eventson:
return
if event.inaxes != self.ax:
return
for cid, func in self.observers.items():
func(event)
def _motion(self, event):
if self.ignore(event):
return
if event.inaxes == self.ax:
c = self.hovercolor
else:
c = self.color
if c != self._lastcolor:
self.ax.set_facecolor(c)
self._lastcolor = c
if self.drawon:
self.ax.figure.canvas.draw()
def on_clicked(self, func):
"""
Connect the callback function *func* to button click events.
Returns a connection id, which can be used to disconnect the callback.
"""
cid = self.cnt
self.observers[cid] = func
self.cnt += 1
return cid
def disconnect(self, cid):
"""Remove the callback function with connection id *cid*."""
try:
del self.observers[cid]
except KeyError:
pass
class Slider(AxesWidget):
"""
A slider representing a floating point range.
Create a slider from *valmin* to *valmax* in axes *ax*. For the slider to
remain responsive you must maintain a reference to it. Call
:meth:`on_changed` to connect to the slider event.
Attributes
----------
val : float
Slider value.
"""
def __init__(self, ax, label, valmin, valmax, valinit=0.5, valfmt='%1.2f',
closedmin=True, closedmax=True, slidermin=None,
slidermax=None, dragging=True, valstep=None,
orientation='horizontal', **kwargs):
"""
Parameters
----------
ax : Axes
The Axes to put the slider in.
label : str
Slider label.
valmin : float
The minimum value of the slider.
valmax : float
The maximum value of the slider.
valinit : float, optional, default: 0.5
The slider initial position.
valfmt : str, optional, default: "%1.2f"
Used to format the slider value, fprint format string.
closedmin : bool, optional, default: True
Indicate whether the slider interval is closed on the bottom.
closedmax : bool, optional, default: True
Indicate whether the slider interval is closed on the top.
slidermin : Slider, optional, default: None
Do not allow the current slider to have a value less than
the value of the Slider `slidermin`.
slidermax : Slider, optional, default: None
Do not allow the current slider to have a value greater than
the value of the Slider `slidermax`.
dragging : bool, optional, default: True
If True the slider can be dragged by the mouse.
valstep : float, optional, default: None
If given, the slider will snap to multiples of `valstep`.
orientation : str, 'horizontal' or 'vertical', default: 'horizontal'
The orientation of the slider.
Notes
-----
Additional kwargs are passed on to ``self.poly`` which is the
:class:`~matplotlib.patches.Rectangle` that draws the slider
knob. See the :class:`~matplotlib.patches.Rectangle` documentation for
valid property names (e.g., `facecolor`, `edgecolor`, `alpha`).
"""
AxesWidget.__init__(self, ax)
if slidermin is not None and not hasattr(slidermin, 'val'):
raise ValueError("Argument slidermin ({}) has no 'val'"
.format(type(slidermin)))
if slidermax is not None and not hasattr(slidermax, 'val'):
raise ValueError("Argument slidermax ({}) has no 'val'"
.format(type(slidermax)))
if orientation not in ['horizontal', 'vertical']:
raise ValueError("Argument orientation ({}) must be either"
"'horizontal' or 'vertical'".format(orientation))
self.orientation = orientation
self.closedmin = closedmin
self.closedmax = closedmax
self.slidermin = slidermin
self.slidermax = slidermax
self.drag_active = False
self.valmin = valmin
self.valmax = valmax
self.valstep = valstep
valinit = self._value_in_bounds(valinit)
if valinit is None:
valinit = valmin
self.val = valinit
self.valinit = valinit
if orientation == 'vertical':
self.poly = ax.axhspan(valmin, valinit, 0, 1, **kwargs)
self.hline = ax.axhline(valinit, 0, 1, color='r', lw=1)
else:
self.poly = ax.axvspan(valmin, valinit, 0, 1, **kwargs)
self.vline = ax.axvline(valinit, 0, 1, color='r', lw=1)
self.valfmt = valfmt
ax.set_yticks([])
if orientation == 'vertical':
ax.set_ylim((valmin, valmax))
else:
ax.set_xlim((valmin, valmax))
ax.set_xticks([])
ax.set_navigate(False)
self.connect_event('button_press_event', self._update)
self.connect_event('button_release_event', self._update)
if dragging:
self.connect_event('motion_notify_event', self._update)
if orientation == 'vertical':
self.label = ax.text(0.5, 1.02, label, transform=ax.transAxes,
verticalalignment='bottom',
horizontalalignment='center')
self.valtext = ax.text(0.5, -0.02, valfmt % valinit,
transform=ax.transAxes,
verticalalignment='top',
horizontalalignment='center')
else:
self.label = ax.text(-0.02, 0.5, label, transform=ax.transAxes,
verticalalignment='center',
horizontalalignment='right')
self.valtext = ax.text(1.02, 0.5, valfmt % valinit,
transform=ax.transAxes,
verticalalignment='center',
horizontalalignment='left')
self.cnt = 0
self.observers = {}
self.set_val(valinit)
def _value_in_bounds(self, val):
"""Makes sure *val* is with given bounds."""
if self.valstep:
val = np.round((val - self.valmin)/self.valstep)*self.valstep
val += self.valmin
if val <= self.valmin:
if not self.closedmin:
return
val = self.valmin
elif val >= self.valmax:
if not self.closedmax:
return
val = self.valmax
if self.slidermin is not None and val <= self.slidermin.val:
if not self.closedmin:
return
val = self.slidermin.val
if self.slidermax is not None and val >= self.slidermax.val:
if not self.closedmax:
return
val = self.slidermax.val
return val
def _update(self, event):
"""Update the slider position."""
if self.ignore(event) or event.button != 1:
return
if event.name == 'button_press_event' and event.inaxes == self.ax:
self.drag_active = True
event.canvas.grab_mouse(self.ax)
if not self.drag_active:
return
elif ((event.name == 'button_release_event') or
(event.name == 'button_press_event' and
event.inaxes != self.ax)):
self.drag_active = False
event.canvas.release_mouse(self.ax)
return
if self.orientation == 'vertical':
val = self._value_in_bounds(event.ydata)
else:
val = self._value_in_bounds(event.xdata)
if val not in [None, self.val]:
self.set_val(val)
def set_val(self, val):
"""
Set slider value to *val*
Parameters
----------
val : float
"""
xy = self.poly.xy
if self.orientation == 'vertical':
xy[1] = 0, val
xy[2] = 1, val
else:
xy[2] = val, 1
xy[3] = val, 0
self.poly.xy = xy
self.valtext.set_text(self.valfmt % val)
if self.drawon:
self.ax.figure.canvas.draw_idle()
self.val = val
if not self.eventson:
return
for cid, func in self.observers.items():
func(val)
def on_changed(self, func):
"""
When the slider value is changed call *func* with the new
slider value
Parameters
----------
func : callable
Function to call when slider is changed.
The function must accept a single float as its arguments.
Returns
-------
cid : int
Connection id (which can be used to disconnect *func*)
"""
cid = self.cnt
self.observers[cid] = func
self.cnt += 1
return cid
def disconnect(self, cid):
"""
Remove the observer with connection id *cid*
Parameters
----------
cid : int
Connection id of the observer to be removed
"""
try:
del self.observers[cid]
except KeyError:
pass
def reset(self):
"""Reset the slider to the initial value"""
if self.val != self.valinit:
self.set_val(self.valinit)
class CheckButtons(AxesWidget):
"""
A GUI neutral set of check buttons.
For the check buttons to remain responsive you must keep a
reference to this object.
The following attributes are exposed
*ax*
The :class:`matplotlib.axes.Axes` instance the buttons are
located in
*labels*
List of :class:`matplotlib.text.Text` instances
*lines*
List of (line1, line2) tuples for the x's in the check boxes.
These lines exist for each box, but have ``set_visible(False)``
when its box is not checked.
*rectangles*
List of :class:`matplotlib.patches.Rectangle` instances
Connect to the CheckButtons with the :meth:`on_clicked` method
"""
def __init__(self, ax, labels, actives=None):
"""
Add check buttons to :class:`matplotlib.axes.Axes` instance *ax*
Parameters
----------
ax : `~matplotlib.axes.Axes`
The parent axes for the widget.
labels : List[str]
The labels of the check buttons.
actives : List[bool], optional
The initial check states of the buttons. The list must have the
same length as *labels*. If not given, all buttons are unchecked.
"""
AxesWidget.__init__(self, ax)
ax.set_xticks([])
ax.set_yticks([])
ax.set_navigate(False)
if actives is None:
actives = [False] * len(labels)
if len(labels) > 1:
dy = 1. / (len(labels) + 1)
ys = np.linspace(1 - dy, dy, len(labels))
else:
dy = 0.25
ys = [0.5]
axcolor = ax.get_facecolor()
self.labels = []
self.lines = []
self.rectangles = []
lineparams = {'color': 'k', 'linewidth': 1.25,
'transform': ax.transAxes, 'solid_capstyle': 'butt'}
for y, label, active in zip(ys, labels, actives):
t = ax.text(0.25, y, label, transform=ax.transAxes,
horizontalalignment='left',
verticalalignment='center')
w, h = dy / 2, dy / 2
x, y = 0.05, y - h / 2
p = Rectangle(xy=(x, y), width=w, height=h, edgecolor='black',
facecolor=axcolor, transform=ax.transAxes)
l1 = Line2D([x, x + w], [y + h, y], **lineparams)
l2 = Line2D([x, x + w], [y, y + h], **lineparams)
l1.set_visible(active)
l2.set_visible(active)
self.labels.append(t)
self.rectangles.append(p)
self.lines.append((l1, l2))
ax.add_patch(p)
ax.add_line(l1)
ax.add_line(l2)
self.connect_event('button_press_event', self._clicked)
self.cnt = 0
self.observers = {}
def _clicked(self, event):
if self.ignore(event) or event.button != 1 or event.inaxes != self.ax:
return
for i, (p, t) in enumerate(zip(self.rectangles, self.labels)):
if (t.get_window_extent().contains(event.x, event.y) or
p.get_window_extent().contains(event.x, event.y)):
self.set_active(i)
break
def set_active(self, index):
"""
Directly (de)activate a check button by index.
*index* is an index into the original label list
that this object was constructed with.
Raises ValueError if *index* is invalid.
Callbacks will be triggered if :attr:`eventson` is True.
"""
if 0 > index >= len(self.labels):
raise ValueError("Invalid CheckButton index: %d" % index)
l1, l2 = self.lines[index]
l1.set_visible(not l1.get_visible())
l2.set_visible(not l2.get_visible())
if self.drawon:
self.ax.figure.canvas.draw()
if not self.eventson:
return
for cid, func in self.observers.items():
func(self.labels[index].get_text())
def get_status(self):
"""
Return a tuple of the status (True/False) of all of the check buttons.
"""
return [l1.get_visible() for (l1, l2) in self.lines]
def on_clicked(self, func):
"""
Connect the callback function *func* to button click events.
Returns a connection id, which can be used to disconnect the callback.
"""
cid = self.cnt
self.observers[cid] = func
self.cnt += 1
return cid
def disconnect(self, cid):
"""remove the observer with connection id *cid*"""
try:
del self.observers[cid]
except KeyError:
pass
class TextBox(AxesWidget):
"""
A GUI neutral text input box.
For the text box to remain responsive you must keep a reference to it.
The following attributes are accessible:
*ax*
The :class:`matplotlib.axes.Axes` the button renders into.
*label*
A :class:`matplotlib.text.Text` instance.
*color*
The color of the text box when not hovering.
*hovercolor*
The color of the text box when hovering.
Call :meth:`on_text_change` to be updated whenever the text changes.
Call :meth:`on_submit` to be updated whenever the user hits enter or
leaves the text entry field.
"""
def __init__(self, ax, label, initial='',
color='.95', hovercolor='1', label_pad=.01):
"""
Parameters
----------
ax : `~matplotlib.axes.Axes`
The `~.axes.Axes` instance the button will be placed into.
label : str
Label for this text box. Accepts string.
initial : str
Initial value in the text box.
color : color
The color of the box.
hovercolor : color
The color of the box when the mouse is over it.
label_pad : float
The distance between the label and the right side of the textbox.
"""
AxesWidget.__init__(self, ax)
self.DIST_FROM_LEFT = .05
self.params_to_disable = [key for key in rcParams if 'keymap' in key]
self.text = initial
self.label = ax.text(-label_pad, 0.5, label,
verticalalignment='center',
horizontalalignment='right',
transform=ax.transAxes)
self.text_disp = self._make_text_disp(self.text)
self.cnt = 0
self.change_observers = {}
self.submit_observers = {}
# If these lines are removed, the cursor won't appear the first
# time the box is clicked:
self.ax.set_xlim(0, 1)
self.ax.set_ylim(0, 1)
self.cursor_index = 0
# Because this is initialized, _render_cursor
# can assume that cursor exists.
self.cursor = self.ax.vlines(0, 0, 0)
self.cursor.set_visible(False)
self.connect_event('button_press_event', self._click)
self.connect_event('button_release_event', self._release)
self.connect_event('motion_notify_event', self._motion)
self.connect_event('key_press_event', self._keypress)
self.connect_event('resize_event', self._resize)
ax.set_navigate(False)
ax.set_facecolor(color)
ax.set_xticks([])
ax.set_yticks([])
self.color = color
self.hovercolor = hovercolor
self._lastcolor = color
self.capturekeystrokes = False
def _make_text_disp(self, string):
return self.ax.text(self.DIST_FROM_LEFT, 0.5, string,
verticalalignment='center',
horizontalalignment='left',
transform=self.ax.transAxes)
def _rendercursor(self):
# this is a hack to figure out where the cursor should go.
# we draw the text up to where the cursor should go, measure
# and save its dimensions, draw the real text, then put the cursor
# at the saved dimensions
widthtext = self.text[:self.cursor_index]
no_text = False
if(widthtext == "" or widthtext == " " or widthtext == " "):
no_text = widthtext == ""
widthtext = ","
wt_disp = self._make_text_disp(widthtext)
self.ax.figure.canvas.draw()
bb = wt_disp.get_window_extent()
inv = self.ax.transData.inverted()
bb = inv.transform(bb)
wt_disp.set_visible(False)
if no_text:
bb[1, 0] = bb[0, 0]
# hack done
self.cursor.set_visible(False)
self.cursor = self.ax.vlines(bb[1, 0], bb[0, 1], bb[1, 1])
self.ax.figure.canvas.draw()
def _notify_submit_observers(self):
if self.eventson:
for cid, func in self.submit_observers.items():
func(self.text)
def _release(self, event):
if self.ignore(event):
return
if event.canvas.mouse_grabber != self.ax:
return
event.canvas.release_mouse(self.ax)
def _keypress(self, event):
if self.ignore(event):
return
if self.capturekeystrokes:
key = event.key
if(len(key) == 1):
self.text = (self.text[:self.cursor_index] + key +
self.text[self.cursor_index:])
self.cursor_index += 1
elif key == "right":
if self.cursor_index != len(self.text):
self.cursor_index += 1
elif key == "left":
if self.cursor_index != 0:
self.cursor_index -= 1
elif key == "home":
self.cursor_index = 0
elif key == "end":
self.cursor_index = len(self.text)
elif(key == "backspace"):
if self.cursor_index != 0:
self.text = (self.text[:self.cursor_index - 1] +
self.text[self.cursor_index:])
self.cursor_index -= 1
elif(key == "delete"):
if self.cursor_index != len(self.text):
self.text = (self.text[:self.cursor_index] +
self.text[self.cursor_index + 1:])
self.text_disp.remove()
self.text_disp = self._make_text_disp(self.text)
self._rendercursor()
self._notify_change_observers()
if key == "enter":
self._notify_submit_observers()
def set_val(self, val):
newval = str(val)
if self.text == newval:
return
self.text = newval
self.text_disp.remove()
self.text_disp = self._make_text_disp(self.text)
self._rendercursor()
self._notify_change_observers()
self._notify_submit_observers()
def _notify_change_observers(self):
if self.eventson:
for cid, func in self.change_observers.items():
func(self.text)
def begin_typing(self, x):
self.capturekeystrokes = True
# disable command keys so that the user can type without
# command keys causing figure to be saved, etc
self.reset_params = {}
for key in self.params_to_disable:
self.reset_params[key] = rcParams[key]
rcParams[key] = []
def stop_typing(self):
notifysubmit = False
# because _notify_submit_users might throw an error in the
# user's code, we only want to call it once we've already done
# our cleanup.
if self.capturekeystrokes:
# since the user is no longer typing,
# reactivate the standard command keys
for key in self.params_to_disable:
rcParams[key] = self.reset_params[key]
notifysubmit = True
self.capturekeystrokes = False
self.cursor.set_visible(False)
self.ax.figure.canvas.draw()
if notifysubmit:
self._notify_submit_observers()
def position_cursor(self, x):
# now, we have to figure out where the cursor goes.
# approximate it based on assuming all characters the same length
if len(self.text) == 0:
self.cursor_index = 0
else:
bb = self.text_disp.get_window_extent()
trans = self.ax.transData
inv = self.ax.transData.inverted()
bb = trans.transform(inv.transform(bb))
text_start = bb[0, 0]
text_end = bb[1, 0]
ratio = (x - text_start) / (text_end - text_start)
if ratio < 0:
ratio = 0
if ratio > 1:
ratio = 1
self.cursor_index = int(len(self.text) * ratio)
self._rendercursor()
def _click(self, event):
if self.ignore(event):
return
if event.inaxes != self.ax:
self.stop_typing()
return
if not self.eventson:
return
if event.canvas.mouse_grabber != self.ax:
event.canvas.grab_mouse(self.ax)
if not self.capturekeystrokes:
self.begin_typing(event.x)
self.position_cursor(event.x)
def _resize(self, event):
self.stop_typing()
def _motion(self, event):
if self.ignore(event):
return
if event.inaxes == self.ax:
c = self.hovercolor
else:
c = self.color
if c != self._lastcolor:
self.ax.set_facecolor(c)
self._lastcolor = c
if self.drawon:
self.ax.figure.canvas.draw()
def on_text_change(self, func):
"""
When the text changes, call this *func* with event.
A connection id is returned which can be used to disconnect.
"""
cid = self.cnt
self.change_observers[cid] = func
self.cnt += 1
return cid
def on_submit(self, func):
"""
When the user hits enter or leaves the submission box, call this
*func* with event.
A connection id is returned which can be used to disconnect.
"""
cid = self.cnt
self.submit_observers[cid] = func
self.cnt += 1
return cid
def disconnect(self, cid):
"""Remove the observer with connection id *cid*."""
for reg in [self.change_observers, self.submit_observers]:
try:
del reg[cid]
except KeyError:
pass
class RadioButtons(AxesWidget):
"""
A GUI neutral radio button.
For the buttons to remain responsive you must keep a reference to this
object.
Connect to the RadioButtons with the :meth:`on_clicked` method.
Attributes
----------
ax
The containing `~.axes.Axes` instance.
activecolor
The color of the selected button.
labels
A list of `~.text.Text` instances containing the button labels.
circles
A list of `~.patches.Circle` instances defining the buttons.
value_selected : str
The label text of the currently selected button.
"""
def __init__(self, ax, labels, active=0, activecolor='blue'):
"""
Add radio buttons to an `~.axes.Axes`.
Parameters
----------
ax : `~matplotlib.axes.Axes`
The axes to add the buttons to.
labels : list of str
The button labels.
active : int
The index of the initially selected button.
activecolor : color
The color of the selected button.
"""
AxesWidget.__init__(self, ax)
self.activecolor = activecolor
self.value_selected = None
ax.set_xticks([])
ax.set_yticks([])
ax.set_navigate(False)
dy = 1. / (len(labels) + 1)
ys = np.linspace(1 - dy, dy, len(labels))
cnt = 0
axcolor = ax.get_facecolor()
# scale the radius of the circle with the spacing between each one
circle_radius = (dy / 2) - 0.01
# defaul to hard-coded value if the radius becomes too large
if(circle_radius > 0.05):
circle_radius = 0.05
self.labels = []
self.circles = []
for y, label in zip(ys, labels):
t = ax.text(0.25, y, label, transform=ax.transAxes,
horizontalalignment='left',
verticalalignment='center')
if cnt == active:
self.value_selected = label
facecolor = activecolor
else:
facecolor = axcolor
p = Circle(xy=(0.15, y), radius=circle_radius, edgecolor='black',
facecolor=facecolor, transform=ax.transAxes)
self.labels.append(t)
self.circles.append(p)
ax.add_patch(p)
cnt += 1
self.connect_event('button_press_event', self._clicked)
self.cnt = 0
self.observers = {}
def _clicked(self, event):
if self.ignore(event) or event.button != 1 or event.inaxes != self.ax:
return
xy = self.ax.transAxes.inverted().transform_point((event.x, event.y))
pclicked = np.array([xy[0], xy[1]])
distances = {}
for i, (p, t) in enumerate(zip(self.circles, self.labels)):
if (t.get_window_extent().contains(event.x, event.y)
or np.linalg.norm(pclicked - p.center) < p.radius):
distances[i] = np.linalg.norm(pclicked - p.center)
if len(distances) > 0:
closest = min(distances, key=distances.get)
self.set_active(closest)
def set_active(self, index):
"""
Select button with number *index*.
Callbacks will be triggered if :attr:`eventson` is True.
"""
if 0 > index >= len(self.labels):
raise ValueError("Invalid RadioButton index: %d" % index)
self.value_selected = self.labels[index].get_text()
for i, p in enumerate(self.circles):
if i == index:
color = self.activecolor
else:
color = self.ax.get_facecolor()
p.set_facecolor(color)
if self.drawon:
self.ax.figure.canvas.draw()
if not self.eventson:
return
for cid, func in self.observers.items():
func(self.labels[index].get_text())
def on_clicked(self, func):
"""
Connect the callback function *func* to button click events.
Returns a connection id, which can be used to disconnect the callback.
"""
cid = self.cnt
self.observers[cid] = func
self.cnt += 1
return cid
def disconnect(self, cid):
"""Remove the observer with connection id *cid*."""
try:
del self.observers[cid]
except KeyError:
pass
class SubplotTool(Widget):
"""
A tool to adjust the subplot params of a :class:`matplotlib.figure.Figure`.
"""
def __init__(self, targetfig, toolfig):
"""
*targetfig*
The figure instance to adjust.
*toolfig*
The figure instance to embed the subplot tool into. If
*None*, a default figure will be created. If you are using
this from the GUI
"""
# FIXME: The docstring seems to just abruptly end without...
self.targetfig = targetfig
toolfig.subplots_adjust(left=0.2, right=0.9)
self.axleft = toolfig.add_subplot(711)
self.axleft.set_title('Click on slider to adjust subplot param')
self.axleft.set_navigate(False)
self.sliderleft = Slider(self.axleft, 'left',
0, 1, targetfig.subplotpars.left,
closedmax=False)
self.sliderleft.on_changed(self.funcleft)
self.axbottom = toolfig.add_subplot(712)
self.axbottom.set_navigate(False)
self.sliderbottom = Slider(self.axbottom,
'bottom', 0, 1,
targetfig.subplotpars.bottom,
closedmax=False)
self.sliderbottom.on_changed(self.funcbottom)
self.axright = toolfig.add_subplot(713)
self.axright.set_navigate(False)
self.sliderright = Slider(self.axright, 'right', 0, 1,
targetfig.subplotpars.right,
closedmin=False)
self.sliderright.on_changed(self.funcright)
self.axtop = toolfig.add_subplot(714)
self.axtop.set_navigate(False)
self.slidertop = Slider(self.axtop, 'top', 0, 1,
targetfig.subplotpars.top,
closedmin=False)
self.slidertop.on_changed(self.functop)
self.axwspace = toolfig.add_subplot(715)
self.axwspace.set_navigate(False)
self.sliderwspace = Slider(self.axwspace, 'wspace',
0, 1, targetfig.subplotpars.wspace,
closedmax=False)
self.sliderwspace.on_changed(self.funcwspace)
self.axhspace = toolfig.add_subplot(716)
self.axhspace.set_navigate(False)
self.sliderhspace = Slider(self.axhspace, 'hspace',
0, 1, targetfig.subplotpars.hspace,
closedmax=False)
self.sliderhspace.on_changed(self.funchspace)
# constraints
self.sliderleft.slidermax = self.sliderright
self.sliderright.slidermin = self.sliderleft
self.sliderbottom.slidermax = self.slidertop
self.slidertop.slidermin = self.sliderbottom
bax = toolfig.add_axes([0.8, 0.05, 0.15, 0.075])
self.buttonreset = Button(bax, 'Reset')
sliders = (self.sliderleft, self.sliderbottom, self.sliderright,
self.slidertop, self.sliderwspace, self.sliderhspace,)
def func(event):
thisdrawon = self.drawon
self.drawon = False
# store the drawon state of each slider
bs = []
for slider in sliders:
bs.append(slider.drawon)
slider.drawon = False
# reset the slider to the initial position
for slider in sliders:
slider.reset()
# reset drawon
for slider, b in zip(sliders, bs):
slider.drawon = b
# draw the canvas
self.drawon = thisdrawon
if self.drawon:
toolfig.canvas.draw()
self.targetfig.canvas.draw()
# during reset there can be a temporary invalid state
# depending on the order of the reset so we turn off
# validation for the resetting
validate = toolfig.subplotpars.validate
toolfig.subplotpars.validate = False
self.buttonreset.on_clicked(func)
toolfig.subplotpars.validate = validate
def funcleft(self, val):
self.targetfig.subplots_adjust(left=val)
if self.drawon:
self.targetfig.canvas.draw()
def funcright(self, val):
self.targetfig.subplots_adjust(right=val)
if self.drawon:
self.targetfig.canvas.draw()
def funcbottom(self, val):
self.targetfig.subplots_adjust(bottom=val)
if self.drawon:
self.targetfig.canvas.draw()
def functop(self, val):
self.targetfig.subplots_adjust(top=val)
if self.drawon:
self.targetfig.canvas.draw()
def funcwspace(self, val):
self.targetfig.subplots_adjust(wspace=val)
if self.drawon:
self.targetfig.canvas.draw()
def funchspace(self, val):
self.targetfig.subplots_adjust(hspace=val)
if self.drawon:
self.targetfig.canvas.draw()
class Cursor(AxesWidget):
"""
A crosshair cursor that spans the axes and moves with mouse cursor.
For the cursor to remain responsive you must keep a reference to it.
Parameters
----------
ax : `matplotlib.axes.Axes`
The `~.axes.Axes` to attach the cursor to.
horizOn : bool, optional, default: True
Whether to draw the horizontal line.
vertOn : bool, optional, default: True
Whether to draw the vertical line.
useblit : bool, optional, default: False
Use blitting for faster drawing if supported by the backend.
Other Parameters
----------------
**lineprops
`.Line2D` properties that control the appearance of the lines.
See also `~.Axes.axhline`.
Examples
--------
See :doc:`/gallery/widgets/cursor`.
"""
def __init__(self, ax, horizOn=True, vertOn=True, useblit=False,
**lineprops):
AxesWidget.__init__(self, ax)
self.connect_event('motion_notify_event', self.onmove)
self.connect_event('draw_event', self.clear)
self.visible = True
self.horizOn = horizOn
self.vertOn = vertOn
self.useblit = useblit and self.canvas.supports_blit
if self.useblit:
lineprops['animated'] = True
self.lineh = ax.axhline(ax.get_ybound()[0], visible=False, **lineprops)
self.linev = ax.axvline(ax.get_xbound()[0], visible=False, **lineprops)
self.background = None
self.needclear = False
def clear(self, event):
"""Internal event handler to clear the cursor."""
if self.ignore(event):
return
if self.useblit:
self.background = self.canvas.copy_from_bbox(self.ax.bbox)
self.linev.set_visible(False)
self.lineh.set_visible(False)
def onmove(self, event):
"""Internal event handler to draw the cursor when the mouse moves."""
if self.ignore(event):
return
if not self.canvas.widgetlock.available(self):
return
if event.inaxes != self.ax:
self.linev.set_visible(False)
self.lineh.set_visible(False)
if self.needclear:
self.canvas.draw()
self.needclear = False
return
self.needclear = True
if not self.visible:
return
self.linev.set_xdata((event.xdata, event.xdata))
self.lineh.set_ydata((event.ydata, event.ydata))
self.linev.set_visible(self.visible and self.vertOn)
self.lineh.set_visible(self.visible and self.horizOn)
self._update()
def _update(self):
if self.useblit:
if self.background is not None:
self.canvas.restore_region(self.background)
self.ax.draw_artist(self.linev)
self.ax.draw_artist(self.lineh)
self.canvas.blit(self.ax.bbox)
else:
self.canvas.draw_idle()
return False
class MultiCursor(Widget):
"""
Provide a vertical (default) and/or horizontal line cursor shared between
multiple axes.
For the cursor to remain responsive you must keep a reference to
it.
Example usage::
from matplotlib.widgets import MultiCursor
import matplotlib.pyplot as plt
import numpy as np
fig, (ax1, ax2) = plt.subplots(nrows=2, sharex=True)
t = np.arange(0.0, 2.0, 0.01)
ax1.plot(t, np.sin(2*np.pi*t))
ax2.plot(t, np.sin(4*np.pi*t))
multi = MultiCursor(fig.canvas, (ax1, ax2), color='r', lw=1,
horizOn=False, vertOn=True)
plt.show()
"""
def __init__(self, canvas, axes, useblit=True, horizOn=False, vertOn=True,
**lineprops):
self.canvas = canvas
self.axes = axes
self.horizOn = horizOn
self.vertOn = vertOn
xmin, xmax = axes[-1].get_xlim()
ymin, ymax = axes[-1].get_ylim()
xmid = 0.5 * (xmin + xmax)
ymid = 0.5 * (ymin + ymax)
self.visible = True
self.useblit = useblit and self.canvas.supports_blit
self.background = None
self.needclear = False
if self.useblit:
lineprops['animated'] = True
if vertOn:
self.vlines = [ax.axvline(xmid, visible=False, **lineprops)
for ax in axes]
else:
self.vlines = []
if horizOn:
self.hlines = [ax.axhline(ymid, visible=False, **lineprops)
for ax in axes]
else:
self.hlines = []
self.connect()
def connect(self):
"""connect events"""
self._cidmotion = self.canvas.mpl_connect('motion_notify_event',
self.onmove)
self._ciddraw = self.canvas.mpl_connect('draw_event', self.clear)
def disconnect(self):
"""disconnect events"""
self.canvas.mpl_disconnect(self._cidmotion)
self.canvas.mpl_disconnect(self._ciddraw)
def clear(self, event):
"""clear the cursor"""
if self.ignore(event):
return
if self.useblit:
self.background = (
self.canvas.copy_from_bbox(self.canvas.figure.bbox))
for line in self.vlines + self.hlines:
line.set_visible(False)
def onmove(self, event):
if self.ignore(event):
return
if event.inaxes is None:
return
if not self.canvas.widgetlock.available(self):
return
self.needclear = True
if not self.visible:
return
if self.vertOn:
for line in self.vlines:
line.set_xdata((event.xdata, event.xdata))
line.set_visible(self.visible)
if self.horizOn:
for line in self.hlines:
line.set_ydata((event.ydata, event.ydata))
line.set_visible(self.visible)
self._update()
def _update(self):
if self.useblit:
if self.background is not None:
self.canvas.restore_region(self.background)
if self.vertOn:
for ax, line in zip(self.axes, self.vlines):
ax.draw_artist(line)
if self.horizOn:
for ax, line in zip(self.axes, self.hlines):
ax.draw_artist(line)
self.canvas.blit(self.canvas.figure.bbox)
else:
self.canvas.draw_idle()
class _SelectorWidget(AxesWidget):
def __init__(self, ax, onselect, useblit=False, button=None,
state_modifier_keys=None):
AxesWidget.__init__(self, ax)
self.visible = True
self.onselect = onselect
self.useblit = useblit and self.canvas.supports_blit
self.connect_default_events()
self.state_modifier_keys = dict(move=' ', clear='escape',
square='shift', center='control')
self.state_modifier_keys.update(state_modifier_keys or {})
self.background = None
self.artists = []
if isinstance(button, Integral):
self.validButtons = [button]
else:
self.validButtons = button
# will save the data (position at mouseclick)
self.eventpress = None
# will save the data (pos. at mouserelease)
self.eventrelease = None
self._prev_event = None
self.state = set()
def set_active(self, active):
AxesWidget.set_active(self, active)
if active:
self.update_background(None)
def update_background(self, event):
"""force an update of the background"""
# If you add a call to `ignore` here, you'll want to check edge case:
# `release` can call a draw event even when `ignore` is True.
if self.useblit:
self.background = self.canvas.copy_from_bbox(self.ax.bbox)
def connect_default_events(self):
"""Connect the major canvas events to methods."""
self.connect_event('motion_notify_event', self.onmove)
self.connect_event('button_press_event', self.press)
self.connect_event('button_release_event', self.release)
self.connect_event('draw_event', self.update_background)
self.connect_event('key_press_event', self.on_key_press)
self.connect_event('key_release_event', self.on_key_release)
self.connect_event('scroll_event', self.on_scroll)
def ignore(self, event):
"""return *True* if *event* should be ignored"""
if not self.active or not self.ax.get_visible():
return True
# If canvas was locked
if not self.canvas.widgetlock.available(self):
return True
if not hasattr(event, 'button'):
event.button = None
# Only do rectangle selection if event was triggered
# with a desired button
if self.validButtons is not None:
if event.button not in self.validButtons:
return True
# If no button was pressed yet ignore the event if it was out
# of the axes
if self.eventpress is None:
return event.inaxes != self.ax
# If a button was pressed, check if the release-button is the
# same.
if event.button == self.eventpress.button:
return False
# If a button was pressed, check if the release-button is the
# same.
return (event.inaxes != self.ax or
event.button != self.eventpress.button)
def update(self):
"""draw using newfangled blit or oldfangled draw depending on
useblit
"""
if not self.ax.get_visible():
return False
if self.useblit:
if self.background is not None:
self.canvas.restore_region(self.background)
for artist in self.artists:
self.ax.draw_artist(artist)
self.canvas.blit(self.ax.bbox)
else:
self.canvas.draw_idle()
return False
def _get_data(self, event):
"""Get the xdata and ydata for event, with limits"""
if event.xdata is None:
return None, None
x0, x1 = self.ax.get_xbound()
y0, y1 = self.ax.get_ybound()
xdata = max(x0, event.xdata)
xdata = min(x1, xdata)
ydata = max(y0, event.ydata)
ydata = min(y1, ydata)
return xdata, ydata
def _clean_event(self, event):
"""Clean up an event
Use prev event if there is no xdata
Limit the xdata and ydata to the axes limits
Set the prev event
"""
if event.xdata is None:
event = self._prev_event
else:
event = copy.copy(event)
event.xdata, event.ydata = self._get_data(event)
self._prev_event = event
return event
def press(self, event):
"""Button press handler and validator"""
if not self.ignore(event):
event = self._clean_event(event)
self.eventpress = event
self._prev_event = event
key = event.key or ''
key = key.replace('ctrl', 'control')
# move state is locked in on a button press
if key == self.state_modifier_keys['move']:
self.state.add('move')
self._press(event)
return True
return False
def _press(self, event):
"""Button press handler"""
pass
def release(self, event):
"""Button release event handler and validator"""
if not self.ignore(event) and self.eventpress:
event = self._clean_event(event)
self.eventrelease = event
self._release(event)
self.eventpress = None
self.eventrelease = None
self.state.discard('move')
return True
return False
def _release(self, event):
"""Button release event handler"""
pass
def onmove(self, event):
"""Cursor move event handler and validator"""
if not self.ignore(event) and self.eventpress:
event = self._clean_event(event)
self._onmove(event)
return True
return False
def _onmove(self, event):
"""Cursor move event handler"""
pass
def on_scroll(self, event):
"""Mouse scroll event handler and validator"""
if not self.ignore(event):
self._on_scroll(event)
def _on_scroll(self, event):
"""Mouse scroll event handler"""
pass
def on_key_press(self, event):
"""Key press event handler and validator for all selection widgets"""
if self.active:
key = event.key or ''
key = key.replace('ctrl', 'control')
if key == self.state_modifier_keys['clear']:
for artist in self.artists:
artist.set_visible(False)
self.update()
return
for (state, modifier) in self.state_modifier_keys.items():
if modifier in key:
self.state.add(state)
self._on_key_press(event)
def _on_key_press(self, event):
"""Key press event handler - use for widget-specific key press actions.
"""
pass
def on_key_release(self, event):
"""Key release event handler and validator."""
if self.active:
key = event.key or ''
for (state, modifier) in self.state_modifier_keys.items():
if modifier in key:
self.state.discard(state)
self._on_key_release(event)
def _on_key_release(self, event):
"""Key release event handler."""
def set_visible(self, visible):
"""Set the visibility of our artists."""
self.visible = visible
for artist in self.artists:
artist.set_visible(visible)
class SpanSelector(_SelectorWidget):
"""
Visually select a min/max range on a single axis and call a function with
those values.
To guarantee that the selector remains responsive, keep a reference to it.
In order to turn off the SpanSelector, set `span_selector.active=False`. To
turn it back on, set `span_selector.active=True`.
Parameters
----------
ax : :class:`matplotlib.axes.Axes` object
onselect : func(min, max), min/max are floats
direction : "horizontal" or "vertical"
The axis along which to draw the span selector
minspan : float, default is None
If selection is less than *minspan*, do not call *onselect*
useblit : bool, default is False
If True, use the backend-dependent blitting features for faster
canvas updates.
rectprops : dict, default is None
Dictionary of :class:`matplotlib.patches.Patch` properties
onmove_callback : func(min, max), min/max are floats, default is None
Called on mouse move while the span is being selected
span_stays : bool, default is False
If True, the span stays visible after the mouse is released
button : int or list of ints
Determines which mouse buttons activate the span selector
1 = left mouse button\n
2 = center mouse button (scroll wheel)\n
3 = right mouse button\n
Examples
--------
>>> import matplotlib.pyplot as plt
>>> import matplotlib.widgets as mwidgets
>>> fig, ax = plt.subplots()
>>> ax.plot([1, 2, 3], [10, 50, 100])
>>> def onselect(vmin, vmax):
... print(vmin, vmax)
>>> rectprops = dict(facecolor='blue', alpha=0.5)
>>> span = mwidgets.SpanSelector(ax, onselect, 'horizontal',
... rectprops=rectprops)
>>> fig.show()
See also: :doc:`/gallery/widgets/span_selector`
"""
def __init__(self, ax, onselect, direction, minspan=None, useblit=False,
rectprops=None, onmove_callback=None, span_stays=False,
button=None):
_SelectorWidget.__init__(self, ax, onselect, useblit=useblit,
button=button)
if rectprops is None:
rectprops = dict(facecolor='red', alpha=0.5)
rectprops['animated'] = self.useblit
cbook._check_in_list(['horizontal', 'vertical'], direction=direction)
self.direction = direction
self.rect = None
self.pressv = None
self.rectprops = rectprops
self.onmove_callback = onmove_callback
self.minspan = minspan
self.span_stays = span_stays
# Needed when dragging out of axes
self.prev = (0, 0)
# Reset canvas so that `new_axes` connects events.
self.canvas = None
self.new_axes(ax)
def new_axes(self, ax):
"""Set SpanSelector to operate on a new Axes"""
self.ax = ax
if self.canvas is not ax.figure.canvas:
if self.canvas is not None:
self.disconnect_events()
self.canvas = ax.figure.canvas
self.connect_default_events()
if self.direction == 'horizontal':
trans = blended_transform_factory(self.ax.transData,
self.ax.transAxes)
w, h = 0, 1
else:
trans = blended_transform_factory(self.ax.transAxes,
self.ax.transData)
w, h = 1, 0
self.rect = Rectangle((0, 0), w, h,
transform=trans,
visible=False,
**self.rectprops)
if self.span_stays:
self.stay_rect = Rectangle((0, 0), w, h,
transform=trans,
visible=False,
**self.rectprops)
self.stay_rect.set_animated(False)
self.ax.add_patch(self.stay_rect)
self.ax.add_patch(self.rect)
self.artists = [self.rect]
def ignore(self, event):
"""return *True* if *event* should be ignored"""
return _SelectorWidget.ignore(self, event) or not self.visible
def _press(self, event):
"""on button press event"""
self.rect.set_visible(self.visible)
if self.span_stays:
self.stay_rect.set_visible(False)
# really force a draw so that the stay rect is not in
# the blit background
if self.useblit:
self.canvas.draw()
xdata, ydata = self._get_data(event)
if self.direction == 'horizontal':
self.pressv = xdata
else:
self.pressv = ydata
self._set_span_xy(event)
return False
def _release(self, event):
"""on button release event"""
if self.pressv is None:
return
self.rect.set_visible(False)
if self.span_stays:
self.stay_rect.set_x(self.rect.get_x())
self.stay_rect.set_y(self.rect.get_y())
self.stay_rect.set_width(self.rect.get_width())
self.stay_rect.set_height(self.rect.get_height())
self.stay_rect.set_visible(True)
self.canvas.draw_idle()
vmin = self.pressv
xdata, ydata = self._get_data(event)
if self.direction == 'horizontal':
vmax = xdata or self.prev[0]
else:
vmax = ydata or self.prev[1]
if vmin > vmax:
vmin, vmax = vmax, vmin
span = vmax - vmin
if self.minspan is not None and span < self.minspan:
return
self.onselect(vmin, vmax)
self.pressv = None
return False
@cbook.deprecated("3.1")
@property
def buttonDown(self):
return False
def _onmove(self, event):
"""on motion notify event"""
if self.pressv is None:
return
self._set_span_xy(event)
if self.onmove_callback is not None:
vmin = self.pressv
xdata, ydata = self._get_data(event)
if self.direction == 'horizontal':
vmax = xdata or self.prev[0]
else:
vmax = ydata or self.prev[1]
if vmin > vmax:
vmin, vmax = vmax, vmin
self.onmove_callback(vmin, vmax)
self.update()
return False
def _set_span_xy(self, event):
"""Setting the span coordinates"""
x, y = self._get_data(event)
if x is None:
return
self.prev = x, y
if self.direction == 'horizontal':
v = x
else:
v = y
minv, maxv = v, self.pressv
if minv > maxv:
minv, maxv = maxv, minv
if self.direction == 'horizontal':
self.rect.set_x(minv)
self.rect.set_width(maxv - minv)
else:
self.rect.set_y(minv)
self.rect.set_height(maxv - minv)
class ToolHandles(object):
"""Control handles for canvas tools.
Parameters
----------
ax : :class:`matplotlib.axes.Axes`
Matplotlib axes where tool handles are displayed.
x, y : 1D arrays
Coordinates of control handles.
marker : str
Shape of marker used to display handle. See `matplotlib.pyplot.plot`.
marker_props : dict
Additional marker properties. See :class:`matplotlib.lines.Line2D`.
"""
def __init__(self, ax, x, y, marker='o', marker_props=None, useblit=True):
self.ax = ax
props = dict(marker=marker, markersize=7, mfc='w', ls='none',
alpha=0.5, visible=False, label='_nolegend_')
props.update(marker_props if marker_props is not None else {})
self._markers = Line2D(x, y, animated=useblit, **props)
self.ax.add_line(self._markers)
self.artist = self._markers
@property
def x(self):
return self._markers.get_xdata()
@property
def y(self):
return self._markers.get_ydata()
def set_data(self, pts, y=None):
"""Set x and y positions of handles"""
if y is not None:
x = pts
pts = np.array([x, y])
self._markers.set_data(pts)
def set_visible(self, val):
self._markers.set_visible(val)
def set_animated(self, val):
self._markers.set_animated(val)
def closest(self, x, y):
"""Return index and pixel distance to closest index."""
pts = np.transpose((self.x, self.y))
# Transform data coordinates to pixel coordinates.
pts = self.ax.transData.transform(pts)
diff = pts - ((x, y))
if diff.ndim == 2:
dist = np.sqrt(np.sum(diff ** 2, axis=1))
return np.argmin(dist), np.min(dist)
else:
return 0, np.sqrt(np.sum(diff ** 2))
class RectangleSelector(_SelectorWidget):
"""
Select a rectangular region of an axes.
For the cursor to remain responsive you must keep a reference to
it.
Example usage::
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import RectangleSelector
def onselect(eclick, erelease):
"eclick and erelease are matplotlib events at press and release."
print('startposition: (%f, %f)' % (eclick.xdata, eclick.ydata))
print('endposition : (%f, %f)' % (erelease.xdata, erelease.ydata))
print('used button : ', eclick.button)
def toggle_selector(event):
print('Key pressed.')
if event.key in ['Q', 'q'] and toggle_selector.RS.active:
print('RectangleSelector deactivated.')
toggle_selector.RS.set_active(False)
if event.key in ['A', 'a'] and not toggle_selector.RS.active:
print('RectangleSelector activated.')
toggle_selector.RS.set_active(True)
x = np.arange(100.) / 99
y = np.sin(x)
fig, ax = plt.subplots()
ax.plot(x, y)
toggle_selector.RS = RectangleSelector(ax, onselect, drawtype='line')
fig.canvas.mpl_connect('key_press_event', toggle_selector)
plt.show()
"""
_shape_klass = Rectangle
def __init__(self, ax, onselect, drawtype='box',
minspanx=None, minspany=None, useblit=False,
lineprops=None, rectprops=None, spancoords='data',
button=None, maxdist=10, marker_props=None,
interactive=False, state_modifier_keys=None):
"""
Create a selector in *ax*. When a selection is made, clear
the span and call onselect with::
onselect(pos_1, pos_2)
and clear the drawn box/line. The ``pos_1`` and ``pos_2`` are
arrays of length 2 containing the x- and y-coordinate.
If *minspanx* is not *None* then events smaller than *minspanx*
in x direction are ignored (it's the same for y).
The rectangle is drawn with *rectprops*; default::
rectprops = dict(facecolor='red', edgecolor = 'black',
alpha=0.2, fill=True)
The line is drawn with *lineprops*; default::
lineprops = dict(color='black', linestyle='-',
linewidth = 2, alpha=0.5)
Use *drawtype* if you want the mouse to draw a line,
a box or nothing between click and actual position by setting
``drawtype = 'line'``, ``drawtype='box'`` or ``drawtype = 'none'``.
Drawing a line would result in a line from vertex A to vertex C in
a rectangle ABCD.
*spancoords* is one of 'data' or 'pixels'. If 'data', *minspanx*
and *minspanx* will be interpreted in the same coordinates as
the x and y axis. If 'pixels', they are in pixels.
*button* is a list of integers indicating which mouse buttons should
be used for rectangle selection. You can also specify a single
integer if only a single button is desired. Default is *None*,
which does not limit which button can be used.
Note, typically:
1 = left mouse button
2 = center mouse button (scroll wheel)
3 = right mouse button
*interactive* will draw a set of handles and allow you interact
with the widget after it is drawn.
*state_modifier_keys* are keyboard modifiers that affect the behavior
of the widget.
The defaults are:
dict(move=' ', clear='escape', square='shift', center='ctrl')
Keyboard modifiers, which:
'move': Move the existing shape.
'clear': Clear the current shape.
'square': Makes the shape square.
'center': Make the initial point the center of the shape.
'square' and 'center' can be combined.
"""
_SelectorWidget.__init__(self, ax, onselect, useblit=useblit,
button=button,
state_modifier_keys=state_modifier_keys)
self.to_draw = None
self.visible = True
self.interactive = interactive
if drawtype == 'none':
drawtype = 'line' # draw a line but make it
self.visible = False # invisible
if drawtype == 'box':
if rectprops is None:
rectprops = dict(facecolor='red', edgecolor='black',
alpha=0.2, fill=True)
rectprops['animated'] = self.useblit
self.rectprops = rectprops
self.to_draw = self._shape_klass((0, 0), 0, 1, visible=False,
**self.rectprops)
self.ax.add_patch(self.to_draw)
if drawtype == 'line':
if lineprops is None:
lineprops = dict(color='black', linestyle='-',
linewidth=2, alpha=0.5)
lineprops['animated'] = self.useblit
self.lineprops = lineprops
self.to_draw = Line2D([0, 0], [0, 0], visible=False,
**self.lineprops)
self.ax.add_line(self.to_draw)
self.minspanx = minspanx
self.minspany = minspany
cbook._check_in_list(['data', 'pixels'], spancoords=spancoords)
self.spancoords = spancoords
self.drawtype = drawtype
self.maxdist = maxdist
if rectprops is None:
props = dict(mec='r')
else:
props = dict(mec=rectprops.get('edgecolor', 'r'))
self._corner_order = ['NW', 'NE', 'SE', 'SW']
xc, yc = self.corners
self._corner_handles = ToolHandles(self.ax, xc, yc, marker_props=props,
useblit=self.useblit)
self._edge_order = ['W', 'N', 'E', 'S']
xe, ye = self.edge_centers
self._edge_handles = ToolHandles(self.ax, xe, ye, marker='s',
marker_props=props,
useblit=self.useblit)
xc, yc = self.center
self._center_handle = ToolHandles(self.ax, [xc], [yc], marker='s',
marker_props=props,
useblit=self.useblit)
self.active_handle = None
self.artists = [self.to_draw, self._center_handle.artist,
self._corner_handles.artist,
self._edge_handles.artist]
if not self.interactive:
self.artists = [self.to_draw]
self._extents_on_press = None
def _press(self, event):
"""on button press event"""
# make the drawed box/line visible get the click-coordinates,
# button, ...
if self.interactive and self.to_draw.get_visible():
self._set_active_handle(event)
else:
self.active_handle = None
if self.active_handle is None or not self.interactive:
# Clear previous rectangle before drawing new rectangle.
self.update()
if not self.interactive:
x = event.xdata
y = event.ydata
self.extents = x, x, y, y
self.set_visible(self.visible)
def _release(self, event):
"""on button release event"""
if not self.interactive:
self.to_draw.set_visible(False)
# update the eventpress and eventrelease with the resulting extents
x1, x2, y1, y2 = self.extents
self.eventpress.xdata = x1
self.eventpress.ydata = y1
xy1 = self.ax.transData.transform_point([x1, y1])
self.eventpress.x, self.eventpress.y = xy1
self.eventrelease.xdata = x2
self.eventrelease.ydata = y2
xy2 = self.ax.transData.transform_point([x2, y2])
self.eventrelease.x, self.eventrelease.y = xy2
if self.spancoords == 'data':
xmin, ymin = self.eventpress.xdata, self.eventpress.ydata
xmax, ymax = self.eventrelease.xdata, self.eventrelease.ydata
# calculate dimensions of box or line get values in the right order
elif self.spancoords == 'pixels':
xmin, ymin = self.eventpress.x, self.eventpress.y
xmax, ymax = self.eventrelease.x, self.eventrelease.y
else:
cbook._check_in_list(['data', 'pixels'],
spancoords=self.spancoords)
if xmin > xmax:
xmin, xmax = xmax, xmin
if ymin > ymax:
ymin, ymax = ymax, ymin
spanx = xmax - xmin
spany = ymax - ymin
xproblems = self.minspanx is not None and spanx < self.minspanx
yproblems = self.minspany is not None and spany < self.minspany
# check if drawn distance (if it exists) is not too small in
# either x or y-direction
if self.drawtype != 'none' and (xproblems or yproblems):
for artist in self.artists:
artist.set_visible(False)
self.update()
return
# call desired function
self.onselect(self.eventpress, self.eventrelease)
self.update()
return False
def _onmove(self, event):
"""on motion notify event if box/line is wanted"""
# resize an existing shape
if self.active_handle and not self.active_handle == 'C':
x1, x2, y1, y2 = self._extents_on_press
if self.active_handle in ['E', 'W'] + self._corner_order:
x2 = event.xdata
if self.active_handle in ['N', 'S'] + self._corner_order:
y2 = event.ydata
# move existing shape
elif (('move' in self.state or self.active_handle == 'C')
and self._extents_on_press is not None):
x1, x2, y1, y2 = self._extents_on_press
dx = event.xdata - self.eventpress.xdata
dy = event.ydata - self.eventpress.ydata
x1 += dx
x2 += dx
y1 += dy
y2 += dy
# new shape
else:
center = [self.eventpress.xdata, self.eventpress.ydata]
center_pix = [self.eventpress.x, self.eventpress.y]
dx = (event.xdata - center[0]) / 2.
dy = (event.ydata - center[1]) / 2.
# square shape
if 'square' in self.state:
dx_pix = abs(event.x - center_pix[0])
dy_pix = abs(event.y - center_pix[1])
if not dx_pix:
return
maxd = max(abs(dx_pix), abs(dy_pix))
if abs(dx_pix) < maxd:
dx *= maxd / (abs(dx_pix) + 1e-6)
if abs(dy_pix) < maxd:
dy *= maxd / (abs(dy_pix) + 1e-6)
# from center
if 'center' in self.state:
dx *= 2
dy *= 2
# from corner
else:
center[0] += dx
center[1] += dy
x1, x2, y1, y2 = (center[0] - dx, center[0] + dx,
center[1] - dy, center[1] + dy)
self.extents = x1, x2, y1, y2
@property
def _rect_bbox(self):
if self.drawtype == 'box':
x0 = self.to_draw.get_x()
y0 = self.to_draw.get_y()
width = self.to_draw.get_width()
height = self.to_draw.get_height()
return x0, y0, width, height
else:
x, y = self.to_draw.get_data()
x0, x1 = min(x), max(x)
y0, y1 = min(y), max(y)
return x0, y0, x1 - x0, y1 - y0
@property
def corners(self):
"""Corners of rectangle from lower left, moving clockwise."""
x0, y0, width, height = self._rect_bbox
xc = x0, x0 + width, x0 + width, x0
yc = y0, y0, y0 + height, y0 + height
return xc, yc
@property
def edge_centers(self):
"""Midpoint of rectangle edges from left, moving clockwise."""
x0, y0, width, height = self._rect_bbox
w = width / 2.
h = height / 2.
xe = x0, x0 + w, x0 + width, x0 + w
ye = y0 + h, y0, y0 + h, y0 + height
return xe, ye
@property
def center(self):
"""Center of rectangle"""
x0, y0, width, height = self._rect_bbox
return x0 + width / 2., y0 + height / 2.
@property
def extents(self):
"""Return (xmin, xmax, ymin, ymax)."""
x0, y0, width, height = self._rect_bbox
xmin, xmax = sorted([x0, x0 + width])
ymin, ymax = sorted([y0, y0 + height])
return xmin, xmax, ymin, ymax
@extents.setter
def extents(self, extents):
# Update displayed shape
self.draw_shape(extents)
# Update displayed handles
self._corner_handles.set_data(*self.corners)
self._edge_handles.set_data(*self.edge_centers)
self._center_handle.set_data(*self.center)
self.set_visible(self.visible)
self.update()
def draw_shape(self, extents):
x0, x1, y0, y1 = extents
xmin, xmax = sorted([x0, x1])
ymin, ymax = sorted([y0, y1])
xlim = sorted(self.ax.get_xlim())
ylim = sorted(self.ax.get_ylim())
xmin = max(xlim[0], xmin)
ymin = max(ylim[0], ymin)
xmax = min(xmax, xlim[1])
ymax = min(ymax, ylim[1])
if self.drawtype == 'box':
self.to_draw.set_x(xmin)
self.to_draw.set_y(ymin)
self.to_draw.set_width(xmax - xmin)
self.to_draw.set_height(ymax - ymin)
elif self.drawtype == 'line':
self.to_draw.set_data([xmin, xmax], [ymin, ymax])
def _set_active_handle(self, event):
"""Set active handle based on the location of the mouse event"""
# Note: event.xdata/ydata in data coordinates, event.x/y in pixels
c_idx, c_dist = self._corner_handles.closest(event.x, event.y)
e_idx, e_dist = self._edge_handles.closest(event.x, event.y)
m_idx, m_dist = self._center_handle.closest(event.x, event.y)
if 'move' in self.state:
self.active_handle = 'C'
self._extents_on_press = self.extents
# Set active handle as closest handle, if mouse click is close enough.
elif m_dist < self.maxdist * 2:
self.active_handle = 'C'
elif c_dist > self.maxdist and e_dist > self.maxdist:
self.active_handle = None
return
elif c_dist < e_dist:
self.active_handle = self._corner_order[c_idx]
else:
self.active_handle = self._edge_order[e_idx]
# Save coordinates of rectangle at the start of handle movement.
x1, x2, y1, y2 = self.extents
# Switch variables so that only x2 and/or y2 are updated on move.
if self.active_handle in ['W', 'SW', 'NW']:
x1, x2 = x2, event.xdata
if self.active_handle in ['N', 'NW', 'NE']:
y1, y2 = y2, event.ydata
self._extents_on_press = x1, x2, y1, y2
@property
def geometry(self):
"""
Returns numpy.ndarray of shape (2,5) containing
x (``RectangleSelector.geometry[1,:]``) and
y (``RectangleSelector.geometry[0,:]``)
coordinates of the four corners of the rectangle starting
and ending in the top left corner.
"""
if hasattr(self.to_draw, 'get_verts'):
xfm = self.ax.transData.inverted()
y, x = xfm.transform(self.to_draw.get_verts()).T
return np.array([x, y])
else:
return np.array(self.to_draw.get_data())
class EllipseSelector(RectangleSelector):
"""
Select an elliptical region of an axes.
For the cursor to remain responsive you must keep a reference to
it.
Example usage::
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import EllipseSelector
def onselect(eclick, erelease):
"eclick and erelease are matplotlib events at press and release."
print('startposition: (%f, %f)' % (eclick.xdata, eclick.ydata))
print('endposition : (%f, %f)' % (erelease.xdata, erelease.ydata))
print('used button : ', eclick.button)
def toggle_selector(event):
print(' Key pressed.')
if event.key in ['Q', 'q'] and toggle_selector.ES.active:
print('EllipseSelector deactivated.')
toggle_selector.RS.set_active(False)
if event.key in ['A', 'a'] and not toggle_selector.ES.active:
print('EllipseSelector activated.')
toggle_selector.ES.set_active(True)
x = np.arange(100.) / 99
y = np.sin(x)
fig, ax = plt.subplots()
ax.plot(x, y)
toggle_selector.ES = EllipseSelector(ax, onselect, drawtype='line')
fig.canvas.mpl_connect('key_press_event', toggle_selector)
plt.show()
"""
_shape_klass = Ellipse
def draw_shape(self, extents):
x1, x2, y1, y2 = extents
xmin, xmax = sorted([x1, x2])
ymin, ymax = sorted([y1, y2])
center = [x1 + (x2 - x1) / 2., y1 + (y2 - y1) / 2.]
a = (xmax - xmin) / 2.
b = (ymax - ymin) / 2.
if self.drawtype == 'box':
self.to_draw.center = center
self.to_draw.width = 2 * a
self.to_draw.height = 2 * b
else:
rad = np.deg2rad(np.arange(31) * 12)
x = a * np.cos(rad) + center[0]
y = b * np.sin(rad) + center[1]
self.to_draw.set_data(x, y)
@property
def _rect_bbox(self):
if self.drawtype == 'box':
x, y = self.to_draw.center
width = self.to_draw.width
height = self.to_draw.height
return x - width / 2., y - height / 2., width, height
else:
x, y = self.to_draw.get_data()
x0, x1 = min(x), max(x)
y0, y1 = min(y), max(y)
return x0, y0, x1 - x0, y1 - y0
class LassoSelector(_SelectorWidget):
"""
Selection curve of an arbitrary shape.
For the selector to remain responsive you must keep a reference to it.
The selected path can be used in conjunction with `~.Path.contains_point`
to select data points from an image.
In contrast to `Lasso`, `LassoSelector` is written with an interface
similar to `RectangleSelector` and `SpanSelector`, and will continue to
interact with the axes until disconnected.
Example usage::
ax = subplot(111)
ax.plot(x,y)
def onselect(verts):
print(verts)
lasso = LassoSelector(ax, onselect)
Parameters
----------
ax : :class:`~matplotlib.axes.Axes`
The parent axes for the widget.
onselect : function
Whenever the lasso is released, the *onselect* function is called and
passed the vertices of the selected path.
button : List[Int], optional
A list of integers indicating which mouse buttons should be used for
rectangle selection. You can also specify a single integer if only a
single button is desired. Default is ``None``, which does not limit
which button can be used.
Note, typically:
- 1 = left mouse button
- 2 = center mouse button (scroll wheel)
- 3 = right mouse button
"""
def __init__(self, ax, onselect=None, useblit=True, lineprops=None,
button=None):
_SelectorWidget.__init__(self, ax, onselect, useblit=useblit,
button=button)
self.verts = None
if lineprops is None:
lineprops = dict()
if useblit:
lineprops['animated'] = True
self.line = Line2D([], [], **lineprops)
self.line.set_visible(False)
self.ax.add_line(self.line)
self.artists = [self.line]
def onpress(self, event):
self.press(event)
def _press(self, event):
self.verts = [self._get_data(event)]
self.line.set_visible(True)
def onrelease(self, event):
self.release(event)
def _release(self, event):
if self.verts is not None:
self.verts.append(self._get_data(event))
self.onselect(self.verts)
self.line.set_data([[], []])
self.line.set_visible(False)
self.verts = None
def _onmove(self, event):
if self.verts is None:
return
self.verts.append(self._get_data(event))
self.line.set_data(list(zip(*self.verts)))
self.update()
class PolygonSelector(_SelectorWidget):
"""Select a polygon region of an axes.
Place vertices with each mouse click, and make the selection by completing
the polygon (clicking on the first vertex). Hold the *ctrl* key and click
and drag a vertex to reposition it (the *ctrl* key is not necessary if the
polygon has already been completed). Hold the *shift* key and click and
drag anywhere in the axes to move all vertices. Press the *esc* key to
start a new polygon.
For the selector to remain responsive you must keep a reference to
it.
Parameters
----------
ax : :class:`~matplotlib.axes.Axes`
The parent axes for the widget.
onselect : function
When a polygon is completed or modified after completion,
the `onselect` function is called and passed a list of the vertices as
``(xdata, ydata)`` tuples.
useblit : bool, optional
lineprops : dict, optional
The line for the sides of the polygon is drawn with the properties
given by `lineprops`. The default is ``dict(color='k', linestyle='-',
linewidth=2, alpha=0.5)``.
markerprops : dict, optional
The markers for the vertices of the polygon are drawn with the
properties given by `markerprops`. The default is ``dict(marker='o',
markersize=7, mec='k', mfc='k', alpha=0.5)``.
vertex_select_radius : float, optional
A vertex is selected (to complete the polygon or to move a vertex)
if the mouse click is within `vertex_select_radius` pixels of the
vertex. The default radius is 15 pixels.
Examples
--------
:doc:`/gallery/widgets/polygon_selector_demo`
"""
def __init__(self, ax, onselect, useblit=False,
lineprops=None, markerprops=None, vertex_select_radius=15):
# The state modifiers 'move', 'square', and 'center' are expected by
# _SelectorWidget but are not supported by PolygonSelector
# Note: could not use the existing 'move' state modifier in-place of
# 'move_all' because _SelectorWidget automatically discards 'move'
# from the state on button release.
state_modifier_keys = dict(clear='escape', move_vertex='control',
move_all='shift', move='not-applicable',
square='not-applicable',
center='not-applicable')
_SelectorWidget.__init__(self, ax, onselect, useblit=useblit,
state_modifier_keys=state_modifier_keys)
self._xs, self._ys = [0], [0]
self._polygon_completed = False
if lineprops is None:
lineprops = dict(color='k', linestyle='-', linewidth=2, alpha=0.5)
lineprops['animated'] = self.useblit
self.line = Line2D(self._xs, self._ys, **lineprops)
self.ax.add_line(self.line)
if markerprops is None:
markerprops = dict(mec='k', mfc=lineprops.get('color', 'k'))
self._polygon_handles = ToolHandles(self.ax, self._xs, self._ys,
useblit=self.useblit,
marker_props=markerprops)
self._active_handle_idx = -1
self.vertex_select_radius = vertex_select_radius
self.artists = [self.line, self._polygon_handles.artist]
self.set_visible(True)
def _press(self, event):
"""Button press event handler"""
# Check for selection of a tool handle.
if ((self._polygon_completed or 'move_vertex' in self.state)
and len(self._xs) > 0):
h_idx, h_dist = self._polygon_handles.closest(event.x, event.y)
if h_dist < self.vertex_select_radius:
self._active_handle_idx = h_idx
# Save the vertex positions at the time of the press event (needed to
# support the 'move_all' state modifier).
self._xs_at_press, self._ys_at_press = self._xs[:], self._ys[:]
def _release(self, event):
"""Button release event handler"""
# Release active tool handle.
if self._active_handle_idx >= 0:
self._active_handle_idx = -1
# Complete the polygon.
elif (len(self._xs) > 3
and self._xs[-1] == self._xs[0]
and self._ys[-1] == self._ys[0]):
self._polygon_completed = True
# Place new vertex.
elif (not self._polygon_completed
and 'move_all' not in self.state
and 'move_vertex' not in self.state):
self._xs.insert(-1, event.xdata)
self._ys.insert(-1, event.ydata)
if self._polygon_completed:
self.onselect(self.verts)
def onmove(self, event):
"""Cursor move event handler and validator"""
# Method overrides _SelectorWidget.onmove because the polygon selector
# needs to process the move callback even if there is no button press.
# _SelectorWidget.onmove include logic to ignore move event if
# eventpress is None.
if not self.ignore(event):
event = self._clean_event(event)
self._onmove(event)
return True
return False
def _onmove(self, event):
"""Cursor move event handler"""
# Move the active vertex (ToolHandle).
if self._active_handle_idx >= 0:
idx = self._active_handle_idx
self._xs[idx], self._ys[idx] = event.xdata, event.ydata
# Also update the end of the polygon line if the first vertex is
# the active handle and the polygon is completed.
if idx == 0 and self._polygon_completed:
self._xs[-1], self._ys[-1] = event.xdata, event.ydata
# Move all vertices.
elif 'move_all' in self.state and self.eventpress:
dx = event.xdata - self.eventpress.xdata
dy = event.ydata - self.eventpress.ydata
for k in range(len(self._xs)):
self._xs[k] = self._xs_at_press[k] + dx
self._ys[k] = self._ys_at_press[k] + dy
# Do nothing if completed or waiting for a move.
elif (self._polygon_completed
or 'move_vertex' in self.state or 'move_all' in self.state):
return
# Position pending vertex.
else:
# Calculate distance to the start vertex.
x0, y0 = self.line.get_transform().transform((self._xs[0],
self._ys[0]))
v0_dist = np.hypot(x0 - event.x, y0 - event.y)
# Lock on to the start vertex if near it and ready to complete.
if len(self._xs) > 3 and v0_dist < self.vertex_select_radius:
self._xs[-1], self._ys[-1] = self._xs[0], self._ys[0]
else:
self._xs[-1], self._ys[-1] = event.xdata, event.ydata
self._draw_polygon()
def _on_key_press(self, event):
"""Key press event handler"""
# Remove the pending vertex if entering the 'move_vertex' or
# 'move_all' mode
if (not self._polygon_completed
and ('move_vertex' in self.state or 'move_all' in self.state)):
self._xs, self._ys = self._xs[:-1], self._ys[:-1]
self._draw_polygon()
def _on_key_release(self, event):
"""Key release event handler"""
# Add back the pending vertex if leaving the 'move_vertex' or
# 'move_all' mode (by checking the released key)
if (not self._polygon_completed
and
(event.key == self.state_modifier_keys.get('move_vertex')
or event.key == self.state_modifier_keys.get('move_all'))):
self._xs.append(event.xdata)
self._ys.append(event.ydata)
self._draw_polygon()
# Reset the polygon if the released key is the 'clear' key.
elif event.key == self.state_modifier_keys.get('clear'):
event = self._clean_event(event)
self._xs, self._ys = [event.xdata], [event.ydata]
self._polygon_completed = False
self.set_visible(True)
def _draw_polygon(self):
"""Redraw the polygon based on the new vertex positions."""
self.line.set_data(self._xs, self._ys)
# Only show one tool handle at the start and end vertex of the polygon
# if the polygon is completed or the user is locked on to the start
# vertex.
if (self._polygon_completed
or (len(self._xs) > 3
and self._xs[-1] == self._xs[0]
and self._ys[-1] == self._ys[0])):
self._polygon_handles.set_data(self._xs[:-1], self._ys[:-1])
else:
self._polygon_handles.set_data(self._xs, self._ys)
self.update()
@property
def verts(self):
"""Get the polygon vertices.
Returns
-------
list
A list of the vertices of the polygon as ``(xdata, ydata)`` tuples.
"""
return list(zip(self._xs[:-1], self._ys[:-1]))
class Lasso(AxesWidget):
"""Selection curve of an arbitrary shape.
The selected path can be used in conjunction with
:func:`~matplotlib.path.Path.contains_point` to select data points
from an image.
Unlike :class:`LassoSelector`, this must be initialized with a starting
point `xy`, and the `Lasso` events are destroyed upon release.
Parameters
----------
ax : `~matplotlib.axes.Axes`
The parent axes for the widget.
xy : (float, float)
Coordinates of the start of the lasso.
callback : callable
Whenever the lasso is released, the `callback` function is called and
passed the vertices of the selected path.
"""
def __init__(self, ax, xy, callback=None, useblit=True):
AxesWidget.__init__(self, ax)
self.useblit = useblit and self.canvas.supports_blit
if self.useblit:
self.background = self.canvas.copy_from_bbox(self.ax.bbox)
x, y = xy
self.verts = [(x, y)]
self.line = Line2D([x], [y], linestyle='-', color='black', lw=2)
self.ax.add_line(self.line)
self.callback = callback
self.connect_event('button_release_event', self.onrelease)
self.connect_event('motion_notify_event', self.onmove)
def onrelease(self, event):
if self.ignore(event):
return
if self.verts is not None:
self.verts.append((event.xdata, event.ydata))
if len(self.verts) > 2:
self.callback(self.verts)
self.ax.lines.remove(self.line)
self.verts = None
self.disconnect_events()
def onmove(self, event):
if self.ignore(event):
return
if self.verts is None:
return
if event.inaxes != self.ax:
return
if event.button != 1:
return
self.verts.append((event.xdata, event.ydata))
self.line.set_data(list(zip(*self.verts)))
if self.useblit:
self.canvas.restore_region(self.background)
self.ax.draw_artist(self.line)
self.canvas.blit(self.ax.bbox)
else:
self.canvas.draw_idle()