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"""
Copyright 2008 Free Software Foundation, Inc.
This file is part of GNU Radio
GNU Radio Companion 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.
GNU Radio Companion 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 Street, Fifth Floor, Boston, MA 02110-1301, USA
"""
from Constants import POSSIBLE_ROTATIONS
def get_rotated_coordinate(coor, rotation):
"""
Rotate the coordinate by the given rotation.
@param coor the coordinate x, y tuple
@param rotation the angle in degrees
@return the rotated coordinates
"""
#handles negative angles
rotation = (rotation + 360)%360
assert rotation in POSSIBLE_ROTATIONS
#determine the number of degrees to rotate
cos_r, sin_r = {
0: (1, 0),
90: (0, 1),
180: (-1, 0),
270: (0, -1),
}[rotation]
x, y = coor
return (x*cos_r + y*sin_r, -x*sin_r + y*cos_r)
def get_angle_from_coordinates((x1,y1), (x2,y2)):
"""
Given two points, calculate the vector direction from point1 to point2, directions are multiples of 90 degrees.
@param (x1,y1) the coordinate of point 1
@param (x2,y2) the coordinate of point 2
@return the direction in degrees
"""
if y1 == y2:#0 or 180
if x2 > x1: return 0
else: return 180
else:#90 or 270
if y2 > y1: return 270
else: return 90
def xml_encode(string):
"""
Encode a string into an xml safe string by replacing special characters.
Needed for gtk pango markup in labels.
@param string the input string
@return output string with safe characters
"""
string = str(string)
for char, safe in (
('&', '&'),
('<', '<'),
('>', '>'),
('"', '"'),
("'", '''),
): string = string.replace(char, safe)
return string
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