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widgets.py
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2807 lines (2281 loc) · 91.3 KB
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"""
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
import numpy as np
from matplotlib import rcParams
from .patches import Circle, Rectangle, Ellipse
from .lines import Line2D
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. The module level "lock"
allows someone to grab the lock and prevent other widgets from
drawing. Use ``matplotlib.widgets.lock(someobj)`` to prevent
other widgets from drawing while you're interacting with the canvas.
"""
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"""
if not self.available(o):
raise ValueError('you do not own this lock')
self._owner = None
def available(self, o):
"""drawing is available to *o*"""
return not self.locked() or self.isowner(o)
def isowner(self, o):
"""Return True if *o* owns this lock"""
return self._owner is o
def locked(self):
"""Return True if 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 :class:`matplotlib.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):
"""
When the button is clicked, call this *func* with event.
A connection id is returned. It can be used to disconnect
the button from its 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 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, **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`.
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)))
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
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([])
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)
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 self.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):
return
if 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
val = self._value_in_bounds(event.xdata)
if (val is not None) and (val != self.val):
self.set_val(val)
def set_val(self, val):
"""
Set slider value to *val*
Parameters
----------
val : float
"""
xy = self.poly.xy
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):
"""
Add check buttons to :class:`matplotlib.axes.Axes` instance *ax*
*labels*
A len(buttons) list of labels as strings
*actives*
A len(buttons) list of booleans indicating whether
the button is active
"""
AxesWidget.__init__(self, ax)
ax.set_xticks([])
ax.set_yticks([])
ax.set_navigate(False)
if len(labels) > 1:
dy = 1. / (len(labels) + 1)
ys = np.linspace(1 - dy, dy, len(labels))
else:
dy = 0.25
ys = [0.5]
cnt = 0
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 in zip(ys, labels):
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(actives[cnt])
l2.set_visible(actives[cnt])
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)
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
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):
"""
returns 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):
"""
When the button is clicked, call *func* with button label
A connection id is returned which can be used to disconnect
"""
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 :class:`matplotlib.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):
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):
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 submision 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.
The following attributes are exposed:
*ax*
The :class:`matplotlib.axes.Axes` instance the buttons are in
*activecolor*
The color of the button when clicked
*labels*
A list of :class:`matplotlib.text.Text` instances
*circles*
A list of :class:`matplotlib.patches.Circle` instances
*value_selected*
A string listing the current value selected
Connect to the RadioButtons with the :meth:`on_clicked` method
"""
def __init__(self, ax, labels, active=0, activecolor='blue'):
"""
Add radio buttons to :class:`matplotlib.axes.Axes` instance *ax*
*labels*
A len(buttons) list of labels as strings
*active*
The index into labels for the button that is active
*activecolor*
The color of the button when clicked
"""
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()
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=0.05, edgecolor='black',
facecolor=facecolor, transform=ax.transAxes)
self.labels.append(t)