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
|
# coding: UTF-8
# Copyright 2009, 2010 Thomas Jourdan
#
# 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 3 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 ka_debug
ICON_WIDTH = ICON_HEIGHT = 48
def explain_points(head, points):
"""
pre: points is not None
post: __return__ is not None
"""
description = '['
for point in points:
description += '%4.3f, %4.3f; ' % (point[0], point[1])
description += ']'
text = head + ' ' + description if head is not None and len(head) \
else description
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, ICON_WIDTH, ICON_HEIGHT)
ctx = cairo.Context(surface)
ctx.scale(ICON_WIDTH, ICON_HEIGHT)
# ka_debug.matrix(ctx.get_matrix())
# paint background
ctx.set_operator(cairo.OPERATOR_OVER)
ctx.set_source_rgb(1.0, 1.0, 1.0)
ctx.paint()
radius = 0.1
ctx.set_line_width(0.02)
for point in points:
# paint a cross for each position
ctx.set_source_rgb(0.0, 0.0, 0.0)
ctx.move_to(0.5+point[0]-radius, 0.5+point[1]-radius)
ctx.line_to(0.5+point[0]+radius, 0.5+point[1]+radius)
ctx.move_to(0.5+point[0]+radius, 0.5+point[1]-radius)
ctx.line_to(0.5+point[0]-radius, 0.5+point[1]+radius)
ctx.stroke()
return text, surface, head
|
