2 Copyright 2008, 2009 Free Software Foundation, Inc.
3 This file is part of GNU Radio
5 GNU Radio Companion is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License
7 as published by the Free Software Foundation; either version 2
8 of the License, or (at your option) any later version.
10 GNU Radio Companion is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
20 from Constants import POSSIBLE_ROTATIONS
21 from Cheetah.Template import Template
27 def rotate_pixmap(gc, src_pixmap, dst_pixmap, angle=gtk.gdk.PIXBUF_ROTATE_COUNTERCLOCKWISE):
29 Load the destination pixmap with a rotated version of the source pixmap.
30 The source pixmap will be loaded into a pixbuf, rotated, and drawn to the destination pixmap.
31 The pixbuf is a client-side drawable, where a pixmap is a server-side drawable.
32 @param gc the graphics context
33 @param src_pixmap the source pixmap
34 @param dst_pixmap the destination pixmap
35 @param angle the angle to rotate by
37 width, height = src_pixmap.get_size()
38 pixbuf = gtk.gdk.Pixbuf(
39 colorspace=gtk.gdk.COLORSPACE_RGB,
40 has_alpha=False, bits_per_sample=8,
41 width=width, height=height,
43 pixbuf.get_from_drawable(src_pixmap, src_pixmap.get_colormap(), 0, 0, 0, 0, -1, -1)
44 pixbuf = pixbuf.rotate_simple(angle)
45 dst_pixmap.draw_pixbuf(gc, pixbuf, 0, 0, 0, 0)
47 def get_rotated_coordinate(coor, rotation):
49 Rotate the coordinate by the given rotation.
50 @param coor the coordinate x, y tuple
51 @param rotation the angle in degrees
52 @return the rotated coordinates
54 #handles negative angles
55 rotation = (rotation + 360)%360
56 assert rotation in POSSIBLE_ROTATIONS
57 #determine the number of degrees to rotate
65 return (x*cos_r + y*sin_r, -x*sin_r + y*cos_r)
67 def get_angle_from_coordinates((x1,y1), (x2,y2)):
69 Given two points, calculate the vector direction from point1 to point2, directions are multiples of 90 degrees.
70 @param (x1,y1) the coordinate of point 1
71 @param (x2,y2) the coordinate of point 2
72 @return the direction in degrees
78 if y2 > y1: return 270
81 def parse_template(tmpl_str, **kwargs):
83 Parse the template string with the given args.
84 Pass in the xml encode method for pango escape chars.
85 @param tmpl_str the template as a string
86 @return a string of the parsed template
88 kwargs['encode'] = gobject.markup_escape_text
89 return str(Template(tmpl_str, kwargs))