Merge commit 'upstream/4.6.1'

[debian/atlc] / src / find_energy_per_metre.c

diff --git a/src/find_energy_per_metre.c b/src/find_energy_per_metre.c
new file mode 100644 (file)
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+++ b/src/find_energy_per_metre.c
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+/* atlc - arbitrary transmission line calculator, for the analysis of
+transmission lines are directional couplers. 
+
+Copyright (C) 2002. Dr. David Kirkby, PhD (G8WRB).
+
+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 package_version 2
+of the License, or (at your option) any later package_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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+USA.
+
+Dr. David Kirkby, e-mail drkirkby at gmail.com 
+
+*/
+#include "config.h"
+#include "definitions.h"
+
+extern double **Vij, **Er;
+extern unsigned char **oddity;
+extern int dielectrics_to_consider_just_now;
+extern double r;
+extern int width, height;
+
+double find_energy_per_metre(int w, int h)
+{
+  double energy_per_metre=0;
+  double Ex, Ey;
+
+  Ex=find_Ex(w,h);
+  Ey=find_Ey(w,h);
+  energy_per_metre+=0.5*EPSILON_0*(Ex*Ex+Ey*Ey);
+  if(dielectrics_to_consider_just_now>1)
+    energy_per_metre*=Er[w][h]; /* second run, energy proportional to Er */
+  return(energy_per_metre);
+}