X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fconvert_create_bmp_for_rect_in_circ_dimensions_to_integers.c;fp=src%2Fconvert_create_bmp_for_rect_in_circ_dimensions_to_integers.c;h=bf6667337549e60990ade3a231a6efe29ba7aa81;hb=ec2d2ab8e90a0c4b86ffc2385655c2fb27fcacd9;hp=0000000000000000000000000000000000000000;hpb=795fb988211df268a8f7724bd2f4493c594abee9;p=debian%2Fatlc

diff --git a/src/convert_create_bmp_for_rect_in_circ_dimensions_to_integers.c b/src/convert_create_bmp_for_rect_in_circ_dimensions_to_integers.c
new file mode 100644
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+++ b/src/convert_create_bmp_for_rect_in_circ_dimensions_to_integers.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"
+
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#include "definitions.h"
+
+/* names, colours and Ers are all arrays of 10. It would be better they were 
+in a structure as they are all linked closely, but they are not and I
+can't be bothered to change it */
+
+extern double DD, ww, hh, xx, yy, Er1;
+extern int D, w, h, x, y;
+extern int lowest;
+extern int highest, verbose;
+
+void convert_create_bmp_for_rect_in_circ_dimensions_to_integers(int accuracy_level) 
+{
+   int best_D=-1, best_w=-1, best_h=-1, best_x=-1, best_y=-1;
+   int min=-1, max=-1;
+   int i;
+   double error, error_min=VERY_LARGE, gridsize, best_grid_size=-1;
+
+   /* scale grid size,  according to a command line option */
+   lowest*=(int) 0.5+pow(2.0,(double) accuracy_level);
+   highest*=(int) 0.5+pow(2.0,(double) accuracy_level);
+
+   for(i=min;i<=max;++i)
+   {
+      /* Try various combinations for  D, w, h, x, & y etc */
+      gridsize=DD/i;
+      D=(int)(DD/gridsize + 0.5);
+      w=(int)(ww/gridsize + 0.5);
+      h=(int)(hh/gridsize + 0.5);
+      x=(int)(xx/gridsize + 0.5);
+      y=(int)(yy/gridsize + 0.5);
+      error=0.0;
+      error+=pow((DD-D*gridsize)/DD,2.0); /* relative error in D */
+      error+=pow((ww-w*gridsize)/ww,2.0);
+      error+=pow((hh-h*gridsize)/hh,2.0);
+      if(x>0)
+         error+=pow((xx-x*gridsize)/xx,2.0);
+      if(y>0)
+          error+=pow((yy-y*gridsize)/yy,2.0);
+      if(error < error_min-TINY)
+      {
+          error_min=error;
+          best_D=D;
+          best_w=w;
+          best_h=h;
+          best_x=x;
+          best_y=y;
+          best_grid_size=gridsize;
+      }
+   }
+   D=best_D;
+   w=best_w;
+   h=best_h;
+   x=best_x;
+   y=best_y;
+   if(verbose==TRUE)
+   {
+      fprintf(stderr,"error_min=%.16f\n",error_min);
+      fprintf(stderr,"User requested: D=%f w=%f h=%f x=%f y=%f Er1=%f\n\n",DD,ww,hh,xx,yy,Er1);
+      fprintf(stderr,"Internally the program is using the following grid:\n");
+      fprintf(stderr,"D=%d w=%d h=%d x=%d y=%d \n", D, w, h, x, y);
+      fprintf(stderr,"which equates to dimensions of D=%f w=%f h=%f x=%f y=%f\n", D*gridsize, w*gridsize, h*gridsize, x*gridsize,
+      y*gridsize);
+      if(error_min > TINY)
+      {
+         fprintf(stderr,"This means we are simulating a transmission line with these dimensions:\n");
+         fprintf(stderr,"W=%f w=%f h=%f x=%f y=%f (mm, inches or whatever)\n",D*best_grid_size,w*best_grid_size,h*best_grid_size,x*best_grid_size,y*best_grid_size);
+         fprintf(stderr,"\nThese are slightly different to what you indicated on the command line,\n");
+         fprintf(stderr,"but they are the best approximation possible, given the grid size\n");
+      }
+   }
+   check_error(DD,D,best_grid_size,"D");
+   check_error(ww,w,best_grid_size,"w");
+   check_error(hh,h,best_grid_size,"h");
+   check_error(xx,x,best_grid_size,"x");
+   check_error(yy,y,best_grid_size,"y");
+}