14.2.84. camcops_server.cc_modules.cc_plot

camcops_server/cc_modules/cc_plot.py


Copyright (C) 2012-2019 Rudolf Cardinal (rudolf@pobox.com).

This file is part of CamCOPS.

CamCOPS is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

CamCOPS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with CamCOPS. If not, see <http://www.gnu.org/licenses/>.


Plotting functions.

PROPER WAY TO USE MATPLOTLIB:

In summary: matplotlib is easy to use in a way that has global state, but that will break in a threading application. Using the Figure() API is safe. Thus:

from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from matplotlib.figure import Figure

fig = Figure()
canvas = FigureCanvas(fig)
ax = fig.add_subplot(111)
ax.plot([1, 2, 3])
ax.set_title('hi mom')
ax.grid(True)
ax.set_xlabel('time')
ax.set_ylabel('volts')
canvas.print_figure('test')