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# Copyright (C) 2009, Martin Dengler <martin@martindengler.com>
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import cairo
import gtk
import gtk.gdk
black = (0.0, 0.0, 0.0, 1.0)
blue = (0.2, 0.0, 0.8, 1.0)
red = (1.0, 0.0, 0.0, 1.0)
class Graph(gtk.Image):
"""Displays a graph of changing linear data points
TODO: improve this overview
"""
def __init__(self, *args, **kwargs):
gtk.Image.__init__(self, *args, **kwargs)
self.connect_after("expose-event", self.__expose_event_cb)
self.line_width = 0.05
self.width = 1.0
self.padding_x = 0.05
self.series = []
self.signals = {}
def add_series(self, series):
self.signals[series] = series.connect('data-changed',
self.__data_changed_cb)
self.series.append(series)
def remove_series(self, series):
series.disconnect(self.signals[series])
del self.signals[series]
self.series.remove(series)
def __data_changed_cb(self, *args, **kwargs):
x, y, w, h = self.allocation
self.window.invalidate_rect((x, y, x+w, y+h), False)
def __expose_event_cb(self, widget, event):
"""sets up a unit-height canvas for the drawing method"""
cr = self._get_cairo_region()
self._draw_frame(cr)
if len(self.series[0].data) > 0:
self._draw_lines(cr)
self._draw_metrics(cr)
def _get_cairo_region(self):
cr = self.window.cairo_create()
x, y, w, h = self.allocation
cr.translate(x, y)
cr.scale(float(h), float(h))
self.width = w / float(h)
cr.set_line_cap(cairo.LINE_CAP_BUTT)
cr.set_line_join(cairo.LINE_JOIN_ROUND)
return cr
def _draw_frame(self, cr):
cr.set_source_rgb(0.5, 0.5, 0.5)
cr.move_to(0, 0)
cr.line_to(self.width, 0)
cr.line_to(self.width, 1.0)
cr.line_to(0, 1.0)
cr.line_to(0, 0)
cr.stroke()
def _draw_lines(self, cr):
tick_line_width = 0.005
for series in self.series:
data = series.data
means = series.moments[1]
colors = series.colors
self._plot_line(cr, colors[0], self.line_width, data)
self._plot_line(cr, colors[1], tick_line_width, means)
line1_tick_offset = -(self.padding_x / 1.99)
self._tick_mark(cr,
colors[0],
self.padding_x / 2.0,
self.line_width, data[-1],
tick_x_offset=line1_tick_offset)
self._tick_mark(cr,
colors[1],
self.padding_x,
tick_line_width,
means[-1],
label="%i" % (means[-1] * 100))
min_datum = min(data)
max_datum = max(data)
self._tick_mark(cr,
colors[2],
self.padding_x,
tick_line_width,
min_datum,
tick_x_offset=line1_tick_offset,
label="%i" % (min_datum * 100))
self._tick_mark(cr,
colors[2],
self.padding_x,
tick_line_width,
max_datum,
tick_x_offset=line1_tick_offset,
label="%i" % (max_datum * 100))
def _draw_metrics(self, cr):
cr.set_font_size(0.09)
if len(self.series) > 0:
series = self.series[0]
colors = series.colors
data = series.data
means = series.moments[1]
self._draw_outlined_text(cr,
"Link quality: %i" % (data[-1] * 100),
colors[0],
(0.0, 0.9))
self._draw_outlined_text(cr,
"Mean: %i" % (means[-1] * 100),
colors[1],
(0.79, 0.9))
def _plot_line(self, cr, color, line_width, data, offset=0.0):
dx = (self.width - (2 * self.padding_x)) / float(len(data))
last_x = 0.0
last_y = 1.0 - data[0] - offset
cr.set_line_width(line_width)
cr.set_source_rgba(*color)
cr.move_to(last_x, last_y)
for idx in range(1, len(data[1:])):
cur_y = 1.0 - data[idx] - offset
dy = cur_y - last_y
cr.rel_line_to(dx, dy)
last_x += dx
last_y += dy
cr.stroke()
def _tick_mark(self, cr, color, tick_width, line_width, datum,
tick_x_offset=0.0, label=None):
cr.set_source_rgba(*color)
cr.set_line_width(line_width)
tick_y = 1.0 - datum
tick_x = self.width - (2.0 * self.padding_x) + tick_x_offset
cr.move_to(tick_x, tick_y)
cr.line_to(tick_x + tick_width, tick_y)
if label is not None:
cr.set_font_size(0.035)
cr.move_to(tick_x + tick_width, tick_y + line_width)
cr.show_text(label)
cr.stroke()
def _draw_outlined_text(self, cr, text, color, pos, font_size=0.09):
x, y = pos
cr.set_source_rgba(*black)
cr.move_to(x - (0.005 * x), y + (0.005 * y))
cr.set_font_size(font_size * 1.005)
cr.show_text(text)
cr.set_source_rgba(*color)
cr.move_to(x, y)
cr.set_font_size(font_size)
cr.show_text(text)
if __name__ == "__main__":
graph = Graph()
import wirelessdataseries
graph.add_series(wirelessdataseries.WirelessDataSeries())
vbox = gtk.VBox()
vbox.pack_start(graph)
w = gtk.Window()
w.add(vbox)
w.show_all()
gtk.main()
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