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# Copyright 2007 Mitchell N. Charity
# Copyright 2009 Walter Bender
#
# This file is part of Ruler.
#
# Ruler 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.
#
# Ruler 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 Ruler. If not, see <http://www.gnu.org/licenses/>
import pygtk
pygtk.require('2.0')
import gtk
import gobject
import dbus
from os import path
import pango
import pangocairo
def get_hardware():
""" Determine whether we are using XO 1.0, 1.5, or "unknown" hardware """
bus = dbus.SystemBus()
comp_obj = bus.get_object('org.freedesktop.Hal',
'/org/freedesktop/Hal/devices/computer')
dev = dbus.Interface(comp_obj, 'org.freedesktop.Hal.Device')
if dev.PropertyExists('system.hardware.vendor') and \
dev.PropertyExists('system.hardware.version'):
if dev.GetProperty('system.hardware.vendor') == 'OLPC':
if dev.GetProperty('system.hardware.version') == '1.5':
return 'XO15'
else:
return 'XO1'
else:
return 'UNKNOWN'
elif path.exists('/etc/olpc-release') or \
path.exists('/sys/power/olpc-pm'):
return 'XO1'
else:
return 'UNKNOWN'
def mm(dpi, n):
""" Convert n pixels to units mm """
return n / 25.40 * dpi
def dimensions_mm(dpi, w, h):
""" Return screen width, height in units mm """
return int(w * 25.40 / dpi), int(h * 25.40 / dpi)
"""
def calc_dpmm():
return 1.0*gtk.gdk.screen_width()/gtk.gdk.screen_width_mm()
def calc_dpi():
# will use xrdb query to get dpi
# $ xdpyinfo
# looking for something similar to " resolution: 96x96 dots per inch"
cmd = "/usr/bin/xdpyinfo"
try:
proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
xrdb_output = re.split("\n",proc.communicate()[0])
for i in xrdb_output:
if i != "":
a = re.split(":",i)
if a[0] == ' resolution':
for b in re.split("\s",a[1]):
if b != "":
c = re.split("x",b)
if len(c) > 1:
print "looking up dpi: " + c[0]
return(int(c[0]))
except:
# just in case the above fails
print "defaulting to 96 dpi"
return(96)
"""
#
# Cairo-related utilities
#
def set_background_color(c, w, h):
c.save()
c.rectangle(0, 0, w, h)
c.set_source_color(gtk.gdk.color_parse('white'))
c.fill()
c.restore()
def set_color(c, name):
c.set_source_color(gtk.gdk.color_parse(name))
def write(c, text, name, size, centered=False, at_top=False):
pc = pangocairo.CairoContext(c)
font = pango.FontDescription(name)
font.set_size(int(round(size * pango.SCALE)))
lo = pc.create_layout()
lo.set_font_description(font)
lo.set_text("X")
extent = [x/pango.SCALE for x in lo.get_extents()[1]]
ex, ey = extent[2], extent[3]
baseline_offset = -ey
if not at_top:
c.rel_move_to(0, baseline_offset)
lo = pc.create_layout()
lo.set_font_description(font)
lo.set_text(text)
extent =[x/pango.SCALE for x in lo.get_extents()[1]]
ex, ey = extent[2], extent[3]
if centered:
c.rel_move_to(-ex / 2, 0)
pc.show_layout(lo)
c.rel_move_to(ex, 0)
if not at_top:
c.rel_move_to(0, -baseline_offset)
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