/usr/lib/python3/dist-packages/matplotlib/_pylab_helpers.py is in python3-matplotlib 1.3.1-1ubuntu5.
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Manage figures for pyplot interface.
"""
import sys, gc
import atexit
def error_msg(msg):
print(msg, file=sys.stderr)
class Gcf(object):
"""
Singleton to manage a set of integer-numbered figures.
This class is never instantiated; it consists of two class
attributes (a list and a dictionary), and a set of static
methods that operate on those attributes, accessing them
directly as class attributes.
Attributes:
*figs*:
dictionary of the form {*num*: *manager*, ...}
*_activeQue*:
list of *managers*, with active one at the end
"""
_activeQue = []
figs = {}
@staticmethod
def get_fig_manager(num):
"""
If figure manager *num* exists, make it the active
figure and return the manager; otherwise return *None*.
"""
manager = Gcf.figs.get(num, None)
if manager is not None:
Gcf.set_active(manager)
return manager
@staticmethod
def destroy(num):
"""
Try to remove all traces of figure *num*.
In the interactive backends, this is bound to the
window "destroy" and "delete" events.
"""
if not Gcf.has_fignum(num): return
manager = Gcf.figs[num]
manager.canvas.mpl_disconnect(manager._cidgcf)
# There must be a good reason for the following careful
# rebuilding of the activeQue; what is it?
oldQue = Gcf._activeQue[:]
Gcf._activeQue = []
for f in oldQue:
if f != manager:
Gcf._activeQue.append(f)
del Gcf.figs[num]
#print len(Gcf.figs.keys()), len(Gcf._activeQue)
manager.destroy()
gc.collect()
@staticmethod
def destroy_fig(fig):
"*fig* is a Figure instance"
num = None
for manager in Gcf.figs.values():
if manager.canvas.figure == fig:
num = manager.num
break
if num is not None:
Gcf.destroy(num)
@staticmethod
def destroy_all():
for manager in list(Gcf.figs.values()):
manager.canvas.mpl_disconnect(manager._cidgcf)
manager.destroy()
Gcf._activeQue = []
Gcf.figs.clear()
gc.collect()
@staticmethod
def has_fignum(num):
"""
Return *True* if figure *num* exists.
"""
return num in Gcf.figs
@staticmethod
def get_all_fig_managers():
"""
Return a list of figure managers.
"""
return list(Gcf.figs.values())
@staticmethod
def get_num_fig_managers():
"""
Return the number of figures being managed.
"""
return len(list(Gcf.figs.values()))
@staticmethod
def get_active():
"""
Return the manager of the active figure, or *None*.
"""
if len(Gcf._activeQue)==0:
return None
else: return Gcf._activeQue[-1]
@staticmethod
def set_active(manager):
"""
Make the figure corresponding to *manager* the active one.
"""
oldQue = Gcf._activeQue[:]
Gcf._activeQue = []
for m in oldQue:
if m != manager: Gcf._activeQue.append(m)
Gcf._activeQue.append(manager)
Gcf.figs[manager.num] = manager
atexit.register(Gcf.destroy_all)
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