/usr/lib/python2.7/dist-packages/ginga/web/pgw/Plot.py is in python-ginga 2.6.1-2.
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# Plot.py -- Plotting widget canvas wrapper.
#
# Copyright (c) Eric R. Jeschke. All rights reserved.
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
#
from io import BytesIO
from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from ginga.web.pgw import Widgets
class PlotWidget(Widgets.Canvas):
"""
This class implements the server-side backend of the surface for a
web-based plot viewer. It uses a web socket to connect to an HTML5
canvas with javascript callbacks in a web browser on the client.
The viewer is created separately on the backend and connects to this
surface via the set_viewer() method.
"""
def __init__(self, plot, width=500, height=500):
super(PlotWidget, self).__init__(width=width, height=height)
self.widget = FigureCanvas(plot.get_figure())
self.logger = plot.logger
self._configured = False
self.refresh_delay = 0.010
self.set_plot(plot)
def set_plot(self, plot):
self.logger.debug("set_plot called")
self.plot = plot
self._dispatch_event_table = {
"activate": self.ignore_event,
"setbounds": self.map_event_cb,
"mousedown": self.ignore_event,
"mouseup": self.ignore_event,
"mousemove": self.ignore_event,
"mouseout": self.ignore_event,
"mouseover": self.ignore_event,
"mousewheel": self.ignore_event,
"wheel": self.ignore_event,
"click": self.ignore_event,
"dblclick": self.ignore_event,
"keydown": self.ignore_event,
"keyup": self.ignore_event,
"keypress": self.ignore_event,
"resize": self.resize_event,
"focus": self.ignore_event,
"focusout": self.ignore_event,
"blur": self.ignore_event,
"drop": self.ignore_event,
"paste": self.ignore_event,
# Hammer.js events
"pinch": self.ignore_event,
"pinchstart": self.ignore_event,
"pinchend": self.ignore_event,
"rotate": self.ignore_event,
"rotatestart": self.ignore_event,
"rotateend": self.ignore_event,
"tap": self.ignore_event,
"pan": self.ignore_event,
"panstart": self.ignore_event,
"panend": self.ignore_event,
"swipe": self.ignore_event,
}
self.plot.add_callback('draw-canvas', self.draw_cb)
self.add_timer('refresh', self.refresh_cb)
def get_plot(self):
return self.plot
def ignore_event(self, event):
pass
def refresh_cb(self):
app = self.get_app()
app.do_operation('refresh_canvas', id=self.id)
self.reset_timer('refresh', self.refresh_delay)
def get_rgb_buffer(self, plot):
buf = BytesIO()
fig = plot.get_figure()
fig.canvas.print_figure(buf, format='png')
wd, ht = self.width, self.height
return (wd, ht, buf.getvalue())
def draw_cb(self, plot):
self.logger.debug("getting RGB buffer")
wd, ht, buf = self.get_rgb_buffer(plot)
#self.logger.debug("clear_rect")
#self.clear_rect(0, 0, wd, ht)
self.logger.debug("drawing %dx%d image" % (wd, ht))
self.draw_image(buf, 0, 0, wd, ht)
self.reset_timer('refresh', self.refresh_delay)
def configure_window(self, wd, ht):
self.logger.debug("canvas resized to %dx%d" % (wd, ht))
fig = self.plot.get_figure()
fig.set_size_inches(float(wd) / fig.dpi, float(ht) / fig.dpi)
def map_event_cb(self, event):
wd, ht = event.width, event.height
self.configure_window(wd, ht)
self.plot.draw()
def resize_event(self, event):
wd, ht = event.width, event.height
self.configure_window(wd, ht)
self.plot.draw()
def _cb_redirect(self, event):
method = self._dispatch_event_table[event.type]
try:
method(event)
except Exception as e:
self.logger.error("error redirecting '%s' event: %s" % (
event.type, str(e)))
# TODO: dump traceback to debug log
#END
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