Source code for sas.qtgui.Utilities.PlotView

from __future__ import with_statement, print_function

# The Figure object is used to create backend-independent plot representations.
from matplotlib.figure import Figure
GUI_TOOLKIT = "qt5"
from matplotlib.backends.qt_compat import QtCore, QtWidgets

[docs]class EmbeddedPylab(object): """ Define a 'with' context manager that lets you use pylab commands to plot on an embedded canvas. This is useful for wrapping existing scripts in a GUI, and benefits from being more familiar than the underlying object oriented interface. As a convenience, the pylab module is returned on entry. *Example* The following example shows how to use the WxAgg backend in a wx panel:: from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas from matplotlib.backends.backend_wxagg import NavigationToolbar2WxAgg as Toolbar from matplotlib.figure import Figure class PlotPanel(wx.Panel): def __init__(self, *args, **kw): wx.Panel.__init__(self, *args, **kw) figure = Figure(figsize=(1,1), dpi=72) canvas = FigureCanvas(self, wx.ID_ANY, figure) self.pylab_interface = EmbeddedPylab(canvas) # Instantiate the matplotlib navigation toolbar and explicitly show it. mpl_toolbar = Toolbar(canvas) mpl_toolbar.Realize() # Create a vertical box sizer to manage the widgets in the main panel. sizer = wx.BoxSizer(wx.VERTICAL) sizer.Add(canvas, 1, wx.EXPAND|wx.LEFT|wx.RIGHT, border=0) sizer.Add(mpl_toolbar, 0, wx.EXPAND|wx.ALL, border=0) # Associate the sizer with its container. self.SetSizer(sizer) sizer.Fit(self) def plot(self, *args, **kw): with self.pylab_interface as pylab: pylab.clf() pylab.plot(*args, **kw) Similar patterns should work for the other backends. Check the source code in matplotlib.backend_bases.* for examples showing how to use matplotlib with other GUI toolkits. """ def __init__(self, canvas): # delay loading pylab until matplotlib.use() is called from matplotlib.backend_bases import FigureManagerBase self.fm = FigureManagerBase(canvas, -1) def __enter__(self): # delay loading pylab until matplotlib.use() is called import pylab from matplotlib._pylab_helpers import Gcf Gcf.set_active(self.fm) return pylab def __exit__(self, *args, **kw): # delay loading pylab until matplotlib.use() is called from matplotlib._pylab_helpers import Gcf Gcf._activeQue = [f for f in Gcf._activeQue if f is not self.fm] try: del Gcf.figs[-1] except KeyError: pass
class _PlotViewShared(object): title = 'Plot' default_size = (600, 400) pylab_interface = None # type: EmbeddedPylab plot_state = None model = None _calculating = False _need_plot = False _need_newmodel = False def set_model(self, model): self.model = model if not self._is_shown(): self._need_newmodel = True else: self._redraw(newmodel=True) def update_model(self, model): #print "profile update model" if self.model != model: # ignore updates to different models return if not self._is_shown(): self._need_newmodel = True else: self._redraw(newmodel=True) def update_parameters(self, model): #print "profile update parameters" if self.model != model: return if not self._is_shown(): self._need_plot = True else: self._redraw(newmodel=self._need_newmodel) def _show(self): #print "showing theory" if self._need_newmodel: self._redraw(newmodel=True) elif self._need_plot: self._redraw(newmodel=False) def _redraw(self, newmodel=False): self._need_newmodel = newmodel if self._calculating: # That means that I've entered the thread through a # wx.Yield for the currently executing redraw. I need # to cancel the running thread and force it to start # the calculation over. self.cancel_calculation = True #print "canceling calculation" return with self.pylab_interface as pylab: self._calculating = True #print "calling again" while True: #print "restarting" # We are restarting the calculation, so clear the reset flag self.cancel_calculation = False if self._need_newmodel: self.newmodel() if self.cancel_calculation: continue self._need_newmodel = False self.plot() if self.cancel_calculation: continue pylab.draw() break self._need_plot = False self._calculating = False def get_state(self): #print "returning state",self.model,self.plot_state return self.model, self.plot_state def set_state(self, state): self.model, self.plot_state = state #print "setting state",self.model,self.plot_state self.plot() def menu(self): """ Return a model specific menu """ return None def newmodel(self, model=None): """ New or updated model structure. Do any sort or precalculation you need. plot will be called separately when you are done. For long calculations, periodically perform wx.YieldIfNeeded() and then if self.cancel_calculation is True, return from the plot. """ pass def plot(self): """ Plot to the current figure. If model has a plot method, just use that. For long calculations, periodically perform wx.YieldIfNeeded() and then if self.cancel_calculation is True, return from the plot. """ if hasattr(self.model, 'plot'): self.model.plot() else: raise NotImplementedError("PlotPanel needs a plot method")
[docs]class PlotView(QtWidgets.QWidget, _PlotViewShared): def __init__(self, *args, **kw): QtWidgets.QWidget.__init__(self, *args, **kw) #import matplotlib.backends.backend_qt4agg #matplotlib.backends.backend_qt4agg.DEBUG = True from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as Toolbar #QtWidgets.QWidget.__init__(self, *args, **kw) # Can specify name on if 'title' in kw: self.title = kw['title'] # Instantiate a figure object that will contain our plots. figure = Figure(figsize=(1,1), dpi=72) # Initialize the figure canvas, mapping the figure object to the plot # engine backend. canvas = FigureCanvas(figure) # Wx-Pylab magic ... # Make our canvas an active figure manager for pylab so that when # pylab plotting statements are executed they will operate on our # canvas and not create a new frame and canvas for display purposes. # This technique allows this application to execute code that uses # pylab stataments to generate plots and embed these plots in our # application window(s). Use _activate_figure() to set. self.pylab_interface = EmbeddedPylab(canvas) # Instantiate the matplotlib navigation toolbar and explicitly show it. mpl_toolbar = Toolbar(canvas, self, False) layout = QtWidgets.QVBoxLayout() layout.addWidget(canvas) layout.addWidget(mpl_toolbar) self.setLayout(layout) def _is_shown(self): return IS_MAC or self.IsShown()