Merge commit 'upstream/4.6.1'

[debian/atlc] / src / find_maximum_values.c

diff --git a/src/find_maximum_values.c b/src/find_maximum_values.c
new file mode 100644 (file)
index 0000000..cb91348
--- /dev/null
+++ b/src/find_maximum_values.c
@@ -0,0 +1,113 @@
+/* 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 int width, height;
+extern unsigned char **oddity;
+extern double **Er, **Vij;
+
+void find_maximum_values(struct max_values *maximum_values, int zero_elementsQ)
+{
+  double U, V, Ex, Ey, E, permittivity;
+  int i, j;
+
+  /* It makes sense to draw the even and odd mode images on the same
+  scale, so if its a coupler, they elements are not zeroed if the
+  function is called when doing the even mode, which is done
+  after the odd mode */
+
+  if(zero_elementsQ==ZERO_ELEMENTS_FIRST)
+  {
+    maximum_values->E_max=0.0;
+    maximum_values->Ex_or_Ey_max=0.0;
+    maximum_values->V_max=0.0;
+    maximum_values->U_max=0.0;
+    maximum_values->permittivity_max=0.0;
+  }
+  for(i=0;i<width;++i)
+  {
+    for(j=0;j<height;++j)
+    {
+      V=Vij[i][j];
+      U=find_energy_per_metre(i,j);
+      if(1)
+      {
+       if(i==0)       
+         Ex=2*Er[i+1][j]*(Vij[i][j]-Vij[i+1][j])/(Er[i+1][j]+Er[i][j]);
+        else if (i==width-1) 
+         Ex=2*Er[i-1][j]*(Vij[i-1][j]-Vij[i][j])/(Er[i-1][j]+Er[i][j]);
+        else /* This is the best estimate, but can't be done on boundary */
+       {
+         Ex=Er[i-1][j]*(Vij[i-1][j]-Vij[i][j])/(Er[i-1][j]+Er[i][j]);
+         Ex+=Er[i+1][j]*(Vij[i][j]-Vij[i+1][j])/(Er[i+1][j]+Er[i][j]);
+        }
+       if(j==0)
+         Ey=2*Er[i][j+1]*(Vij[i][j]-Vij[i][j+1])/(Er[i][j+1]+Er[i][j]);
+       else if (j==height-1)
+         Ey=2*Er[i][j-1]*(Vij[i][j-1]-Vij[i][j])/(Er[i][j-1]+Er[i][j]);
+       else
+       {
+         Ey=Er[i][j-1]*(Vij[i][j-1]-Vij[i][j])/(Er[i][j-1]+Er[i][j]);
+         Ey+=Er[i][j+1]*(Vij[i][j]-Vij[i][j+1])/(Er[i][j+1]+Er[i][j]);
+        }
+        E=sqrt(Ex*Ex+Ey*Ey);
+        permittivity=Er[i][j];
+      }
+      else
+      {
+        Ex=0.0;
+       Ey=0.0;
+       E=0.0;
+       permittivity=0.0;
+      }
+      if(U> 1.0)             
+        printf("U=%f v=%f Er=%f at %d %d\n",U,V,Er[i][j],i, j);
+
+      if(E>maximum_values->E_max) 
+        maximum_values->E_max=E;
+
+
+      if(fabs(Ex)>maximum_values->Ex_or_Ey_max)
+        maximum_values->Ex_or_Ey_max=fabs(Ex);
+
+      if(fabs(Ey)>maximum_values->Ex_or_Ey_max)
+        maximum_values->Ex_or_Ey_max=fabs(Ey);
+
+      if(fabs(E)>maximum_values->E_max)
+        maximum_values->E_max=fabs(E);
+
+      if(fabs(V) > maximum_values->V_max)
+        maximum_values->V_max=fabs(V); 
+
+      if(U > maximum_values->U_max)
+        maximum_values->U_max=U; 
+
+      if(permittivity >maximum_values->permittivity_max )
+        maximum_values->permittivity_max=permittivity; 
+        /* printf("Ex_or_Ey_max=%g E_max=%g V_max=%g U_max=%g Er_max=%g\n",maximum_values->Ex_or_Ey_max, maximum_values->E_max, maximum_values->V_max, maximum_values->U_max, maximum_values->permittivity_max);  */
+    }
+  }
+}