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Diffstat (limited to 'grc/gui/Utils.py')
| -rw-r--r-- | grc/gui/Utils.py | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/grc/gui/Utils.py b/grc/gui/Utils.py new file mode 100644 index 000000000..ee6dc6cdc --- /dev/null +++ b/grc/gui/Utils.py @@ -0,0 +1,82 @@ +""" +Copyright 2008, 2009 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 +from Cheetah.Template import Template + +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 + +def parse_template(tmpl_str, **kwargs): + """ + Parse the template string with the given args. + Pass in the xml encode method for pango escape chars. + @param tmpl_str the template as a string + @return a string of the parsed template + """ + kwargs['encode'] = xml_encode + return str(Template(tmpl_str, kwargs)) |