1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
#!/usr/bin/env python
## Copyright (C) 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):
l = level.get_level ()
l += 1
if l > 100:
l = 0
level.set_level (l)
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.main ()
|