kopia lustrzana https://github.com/ctjacobs/pyqso
96 wiersze
4.2 KiB
Python
96 wiersze
4.2 KiB
Python
#!/usr/bin/env python3
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# Copyright (C) 2013 Christian T. Jacobs.
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# This file is part of PyQSO.
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# PyQSO is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# PyQSO is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with PyQSO. If not, see <http://www.gnu.org/licenses/>.
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from gi.repository import Gtk, GObject
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import logging
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from datetime import datetime
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try:
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import numpy
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logging.info("Using version %s of numpy." % (numpy.__version__))
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import matplotlib
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logging.info("Using version %s of matplotlib." % (matplotlib.__version__))
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matplotlib.use('Agg')
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matplotlib.rcParams['font.size'] = 10.0
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import mpl_toolkits.basemap
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logging.info("Using version %s of mpl_toolkits.basemap." % (mpl_toolkits.basemap.__version__))
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from matplotlib.backends.backend_gtk3cairo import FigureCanvasGTK3Cairo as FigureCanvas
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have_necessary_modules = True
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except ImportError as e:
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logging.warning(e)
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logging.warning("Could not import a non-standard Python module needed by the GreyLine class, or the version of the non-standard module is too old. Check that all the PyQSO dependencies are satisfied.")
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have_necessary_modules = False
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class GreyLine(Gtk.VBox):
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""" A tool for visualising the grey line. """
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def __init__(self, parent):
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""" Set up the drawing canvas and the timer which will re-plot the grey line every 30 minutes.
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:arg parent: The parent Gtk window.
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"""
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logging.debug("Setting up the grey line...")
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Gtk.VBox.__init__(self, spacing=2)
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self.parent = parent
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if(have_necessary_modules):
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self.fig = matplotlib.figure.Figure()
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self.canvas = FigureCanvas(self.fig) # For embedding in the Gtk application
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self.pack_start(self.canvas, True, True, 0)
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self.refresh_event = GObject.timeout_add(1800000, self.draw) # Re-draw the grey line automatically after 30 minutes (if the grey line tool is visible).
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self.show_all()
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logging.debug("Grey line ready!")
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return
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def draw(self):
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""" Draw the world map and the grey line on top of it.
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:returns: Always returns True to satisfy the GObject timer, unless the necessary GreyLine dependencies are not satisfied (in which case, the method returns False so as to not re-draw the canvas).
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:rtype: bool
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"""
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if(have_necessary_modules):
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if(self.parent.toolbox.tools.get_current_page() != 1 or not self.parent.toolbox.get_visible()):
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# Don't re-draw if the grey line is not visible.
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return True # We need to return True in case this is method was called by a timer event.
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else:
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logging.debug("Drawing the grey line...")
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# Re-draw the grey line
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self.fig.clf()
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sub = self.fig.add_subplot(111)
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# Draw the map of the world. This is based on the example from:
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# http://matplotlib.org/basemap/users/examples.html
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m = mpl_toolkits.basemap.Basemap(projection='mill', lon_0=0, ax=sub, resolution='c', fix_aspect=False)
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m.drawcountries(linewidth=0.5)
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m.drawcoastlines(linewidth=0.5)
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m.drawparallels(numpy.arange(-90, 90, 30), labels=[1, 0, 0, 0])
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m.drawmeridians(numpy.arange(m.lonmin, m.lonmax+30, 60), labels=[0, 0, 0, 1])
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m.drawmapboundary(fill_color='lightblue')
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m.fillcontinents(color='darkgreen', lake_color='lightblue')
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m.nightshade(datetime.utcnow()) # Add in the grey line using UTC time. Note that this requires NetCDF.
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logging.debug("Grey line drawn.")
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return True
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else:
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return False # Don't try to re-draw the canvas if the necessary modules to do so could not be imported.
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