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#!/usr/bin/env python
# Copyright (C) 2007, Eduardo Silva (edsiper@gmail.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 os
import gtk, gobject
import gtk.gdk
import cairo
import string
import drwarea
class CPU_Usage:
CPU_HZ = 0
last_jiffies = 0
times = 0
def __init__(self):
self.CPU_hz = os.sysconf(2)
def _get_CPU_data(self):
# Uptime info
stat_file = "/proc/stat"
try:
infile = file(stat_file, "r")
except:
print "Error trying uptime file"
return -1
stat_line = infile.readline()
cpu_info = string.split(stat_line, ' ')
infile.close()
return cpu_info
def _get_CPU_usage(self):
cpu_info = self._get_CPU_data()
used_jiffies = (int(cpu_info[2]) + int(cpu_info[3]) + int(cpu_info[4]))
if self.times ==0:
self.last_jiffies = used_jiffies
self.times +=1
return True
new_ujiffies = (used_jiffies - self.last_jiffies)
new_ajiffies = ((self.frequency/1000) * self.CPU_hz)
if new_ajiffies <= 0:
pcpu = 0.0
else:
pcpu = ((new_ujiffies*100)/new_ajiffies)
if pcpu >100:
pcpu = 100
self.times +=1
self.last_jiffies = used_jiffies
return pcpu
class Interface:
context = None
frequency_timer = 1
graph_offset = 7
def __init__(self):
self.drw_width = gtk.gdk.screen_width() * 90 / 100
self.drw_height = gtk.gdk.screen_height() * 20 / 100
self.y_cpu = self.drw_height - self.graph_offset
self.drw_buffer = []
drawingarea = gtk.DrawingArea()
drawingarea.set_size_request(self.drw_width, self.drw_height)
drawingarea.connect("expose-event", self.do_expose)
self.dat = drwarea.Drawing_Area_Tools(drawingarea)
fixed = gtk.Fixed();
fixed.set_border_width(10)
fixed.add(drawingarea)
self.frame = gtk.Frame('System CPU Usage: 0%')
self.frame.set_border_width(10)
self.frame.add(fixed)
self.widget = self.hbox = gtk.HBox(False, 3)
self.hbox.pack_start(self.frame, True, True, 0)
self.hbox.show_all()
DRW_CPU = CPU_Usage()
DRW_CPU.frequency = 1000 # 1 Second
gobject.timeout_add(DRW_CPU.frequency, self._draw_cpu_usage, DRW_CPU, drawingarea)
def _draw_cpu_usage(self, DRW_CPU, drwarea):
# End of the graph ?
if ((self.frequency_timer + 1)*self.graph_offset) >= (self.drw_width - self.graph_offset):
self.frequency_timer = 1
self.drw_buffer = []
self.do_expose(drwarea, None)
context = drwarea.window.cairo_create()
from_x = self.frequency_timer * self.graph_offset
from_y = self.y_cpu
self.frequency_timer += 1
pcpu = DRW_CPU._get_CPU_usage()
self.drw_buffer.append(pcpu)
to_x = self.frequency_timer * self.graph_offset
self.y_cpu = to_y = self._get_y_cpu(pcpu)
# Context properties
context.set_line_width(2)
context.set_source_rgb(0,1,0)
cpu_label = str(round(pcpu, 4))
self.frame.set_label('System CPU Usage: ' + cpu_label + ' %')
self.dat.draw_line(context, from_x, from_y, to_x, to_y)
context.stroke()
return True
def _get_y_cpu(self, pcpu):
height = (self.dat.range_y['to']) - (self.dat.range_y['from'])
# Get percent of cpu usage
y_value = (height - ((pcpu*height)/100) + 4)
return int(y_value)
def do_expose(self, widget, event):
self.context = widget.window.cairo_create()
self.context.rectangle(0, 0, self.dat.width - 1, self.dat.height - 1)
self.context.set_source_rgb (0,0,0)
self.context.fill_preserve()
# Drawing horizontal and vertical border lines
self.dat.draw_border_lines(self.context)
# Drawing grid
line_margin = self.dat.margin
self.context.set_source_rgb(1, 1, 1)
self.context.set_line_width(1)
self.dat.draw_grid(self.context, line_margin + 1, line_margin + 1, self.dat.width - line_margin - 2, self.dat.height - line_margin - 2)
self.context.stroke()
self._draw_buffer(widget)
return False
def _draw_buffer(self, drwarea):
freq = 1 # Frequency timer
last_y = self.drw_height - self.graph_offset
context = drwarea.window.cairo_create()
for pcpu in self.drw_buffer:
from_x = freq * self.graph_offset
from_y = last_y
freq+=1
to_x = freq * self.graph_offset
last_y = to_y = self._get_y_cpu(pcpu)
# Context properties
context.set_line_width(2)
context.set_source_rgb(0,1,0)
self.dat.draw_line(context, from_x, from_y, to_x, to_y)
context.stroke()
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