## Copyright (C) 2016 Jens Ahrensfeld
## 
## 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, see <http://www.gnu.org/licenses/>.

## -*- texinfo -*- 
## @deftypefn {Function File} {@var{retval} =} pt_eval (@var{input1}, @var{input2})
##
## @seealso{}
## @end deftypefn

## Author: Jens Ahrensfeld <ahrensfeld@w2ess001vm>
## Created: 2016-11-04

function pt_eval (vX, vY)

if 0
  k = sqrt(2)/1.5;
  v = sqrt(vX^2 + vY^2);
  nx = k*abs(vX)/v;
  ny = k*abs(vY)/v;
else
  k = 1.0/1.5;
  nx = k;
  ny = k;
end

mot1 =  0.5*vX*nx + vY*ny
mot2 = -0.5*vX*nx + vY*ny

rotX = mot1 - mot2
rotY = 0.5*(mot1 + mot2)
vrot = sqrt(rotX^2 + rotY^2)
endfunction