Utils.py

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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
"""
##@package grc.gui.elements.Utils
#Shared functions for flow graph elements.
#@author Josh Blum

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.
        @param string the input string
        @return output string with safe characters
        """
        string = str(string)
        for char, safe in (
                        ('&', '&'),
                        ('<', '&lt;'),
                        ('>', '&gt;'),
                        ('"', '&quot;'),
                        ("'", '&apos;'),
        ): string = string.replace(char, safe)
        return string

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