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#!/usr/bin/env python
## Copyright (C) 2009, 2010 Red Hat, Inc.
## Authors:
## Tim Waugh <twaugh@redhat.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., 675 Mass Ave, Cambridge, MA 02139, USA.
import gtk
import cairo
class GtkInkLevel (gtk.DrawingArea):
def __init__ (self, color, level=0):
gtk.DrawingArea.__init__ (self)
self.connect ('expose-event', self.expose_event)
self._level = level
try:
self._color = gtk.gdk.color_parse (color)
except (ValueError, TypeError):
self._color = gtk.gdk.color_parse ('#cccccc')
self.set_size_request (30, 45)
def set_level (self, level):
self._level = level
self.queue_resize ()
def get_level (self):
return self._level
def expose_event (self, widget, event):
ctx = self.window.cairo_create ()
ctx.rectangle (event.area.x, event.area.y,
event.area.width,
event.area.height)
ctx.clip ()
(w, h) = self.window.get_size ()
ratio = 1.0 * h / w
if ratio < 1.5:
w = h * 2.0 / 3.0
else:
h = w * 3.0 / 2.0
thickness = 1
ctx.translate (thickness, thickness)
ctx.scale (w - 2 * thickness, h - 2 * thickness)
thickness = max (ctx.device_to_user_distance (thickness, thickness))
self.draw (ctx, thickness)
def draw (self, ctx, thickness):
r = self._color.red / 65535.0
g = self._color.green / 65535.0
b = self._color.blue / 65535.0
fill_point = self._level / 100.0
ctx.move_to (0.5, 0.0)
ctx.curve_to (0.5, 0.33, 1.0, 0.5, 1.0, 0.67)
ctx.curve_to (1.0, 0.85, 0.85, 1.0, 0.5, 1.0)
ctx.curve_to (0.15, 1.0, 0.0, 0.85, 0.0, 0.67)
ctx.curve_to (0.0, 0.5, 0.1, 0.2, 0.5, 0.0)
ctx.close_path ()
ctx.set_source_rgb (r, g, b)
ctx.set_line_width (thickness)
ctx.stroke_preserve ()
if fill_point > 0.0:
grad_width = 0.10
grad_start = fill_point - (grad_width / 2)
if grad_start < 0:
grad_start = 0
pat = cairo.LinearGradient (0, 1, 0, 0)
pat.add_color_stop_rgba (0, r, g, b, 1)
pat.add_color_stop_rgba ((self._level - 5) / 100.0, r, g, b, 1)
pat.add_color_stop_rgba ((self._level + 5)/ 100.0, 1, 1, 1, 1)
pat.add_color_stop_rgba (1.0, 1, 1, 1, 1)
ctx.set_source (pat)
ctx.fill ()
else:
ctx.set_source_rgb (1, 1, 1)
ctx.fill ()
ctx.set_line_width (thickness / 2)
ctx.move_to (0.5, 0.0)
ctx.line_to (0.5, 1.0)
ctx.set_source_rgb (r, g, b)
ctx.stroke ()
# 50% marker
ctx.move_to (0.4, 0.5)
ctx.line_to (0.6, 0.5)
ctx.set_source_rgb (r, g, b)
ctx.stroke ()
# 25% marker
ctx.move_to (0.45, 0.75)
ctx.line_to (0.55, 0.75)
ctx.set_source_rgb (r, g, b)
ctx.stroke ()
# 75% marker
ctx.move_to (0.45, 0.25)
ctx.line_to (0.55, 0.25)
ctx.set_source_rgb (r, g, b)
ctx.stroke ()
if __name__ == '__main__':
# Try it out.
import gobject
import time
def adjust_level (level):
gtk.gdk.threads_enter ()
l = level.get_level ()
l += 1
if l > 100:
l = 0
level.set_level (l)
gtk.gdk.threads_leave ()
return True
w = gtk.Window ()
w.set_border_width (12)
vbox = gtk.VBox (spacing=6)
w.add (vbox)
hbox = gtk.HBox (spacing=6)
vbox.pack_start (hbox, False, False, 0)
klevel = GtkInkLevel ("black", level=100)
clevel = GtkInkLevel ("cyan", level=60)
mlevel = GtkInkLevel ("magenta", level=30)
ylevel = GtkInkLevel ("yellow", level=100)
hbox.pack_start (klevel)
hbox.pack_start (clevel)
hbox.pack_start (mlevel)
hbox.pack_start (ylevel)
gobject.timeout_add (10, adjust_level, klevel)
gobject.timeout_add (10, adjust_level, clevel)
gobject.timeout_add (10, adjust_level, mlevel)
gobject.timeout_add (10, adjust_level, ylevel)
w.show_all ()
w.connect ('delete_event', gtk.main_quit)
gtk.gdk.threads_init ()
gtk.main ()
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