def wrap_plot(plot):
# helper function, to wrap MatPlotLib figure and PyQtGraph PlotItem/ViewBox/etc in a Qt widget
if type(plot).__name__ == 'Figure':
widget = FigureCanvas(plot)
else:
widget = pg.GraphicsLayoutWidget()
widget.addItem(plot)
return widget
def on_visualization_ready(self, panel_name, data, source_code, base_folder):
"""Called when an updated visualization (possibly new) has been
loaded for the current experiment"""
# ignore it if it's not the right base folder (happens when the user does not
# wait for loading to finish and selects another experiment)
if base_folder != self.folder: return
# render the MatPlotLib/PyQtGraph figures
new_plots = self.render_visualization(panel_name, data, source_code)
# assign each plot to a new or reused panel.
# NOTE: most of this complicated logic is to deal with a specific MatPlotLib/
# FigureCanvas bug. we cannot delete a FigureCanvas and assign a new one to the
# same figure, or there are many graphical glitches (especially related to DPI).
# to avoid this, we reuse the same widget (actually the parent panel widget) for
# the same MatPlotLib figure every time (stored as overboard_panel attribute).
new_panels = []
old_panels = self.panels.get(panel_name, [])
old_panels_pg = [p for p in old_panels if p.plot_type == 'PlotItem']
old_panels_gl = [p for p in old_panels if p.plot_type == 'GLViewWidget']
for (name, plot) in new_plots.items():
plot_type = self.get_plot_type(plot)
if plot_type == 'Figure': # MatPlotLib Figure
if hasattr(plot, 'overboard_panel'): # always reuse a previous panel
panel = self.window.add_panel(plot.overboard_panel, name, reuse=True)
panel.plot_widget.draw() # ensure the figure is redrawn
else: # it's new
widget = FigureCanvas(plot)
panel = self.window.add_panel(widget, name)
plot.overboard_panel = panel # always associate the same panel with this figure
elif plot_type == 'PlotItem': # PyQtGraph PlotItem
if old_panels_pg:
# we can reuse an old panel and the pg.GraphicsLayoutWidget that it contains
panel = old_panels_pg.pop()
panel.plot_widget.clear()
panel.plot_widget.addItem(plot)
panel = self.window.add_panel(panel, name, reuse=True)
else: # it's new
widget = pg.GraphicsLayoutWidget()
widget.addItem(plot)
panel = self.window.add_panel(widget, name)
elif plot_type in ('GLViewWidget', 'PlotWidget'): # PyQtGraph GLViewWidget/PlotWidget
widget = plot
if old_panels_gl:
# we can reuse an old panel, but assign the new GLViewWidget to it
panel = old_panels_gl.pop()
# remove the old one
panel.plot_widget.setParent(None)
panel.layout().removeWidget(panel.plot_widget)
if panel.plot_widget is not widget: # don't delete if the same widget was returned by the user's custom function
panel.plot_widget.deleteLater()
# insert the new
panel.plot_widget = widget
panel.layout().addWidget(widget, stretch=1)
panel = self.window.add_panel(panel, name, reuse=True)
else: # it's new
panel = self.window.add_panel(widget, name)
plot.show() # ensure the OpenGL plot is updated
panel.plot_type = plot_type # remember the plot type (regardless of nested widgets)
new_panels.append(panel)
panel.title_widget.setText(name) # ensure title is correct
# remove any panels we did not reuse from the layout
self.delete_vis_panels(list(set(old_panels) - set(new_panels)))
self.panels[panel_name] = new_panels