--- /dev/null
+/* 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
+
+#ifdef HAVE_MATH_H
+#include <math.h>
+#endif
+
+#include "definitions.h"
+
+extern double **Vij;
+extern double **Er;
+extern unsigned char **oddity;
+
+void calculate_colour_data(double x, double xmax, int w, int h, int offset, unsigned char *image_dat, int image_type,
+unsigned char *red, unsigned char *green, unsigned char *blue, double image_fiddle_factor)
+{
+ if(image_type==COLOUR) /*Ex, Ey, V */
+ {
+ if(fabs(x) < 1e-9) /* This is a bit of a fiddle I admit, but */
+ { /* Is needed to prevent problems at 'small' values */
+ *red=0;
+ *green=0;
+ *blue=0;
+ }
+ else if(x > 0.0)
+ {
+ *red=255*pow(x/xmax,1.0/image_fiddle_factor);
+ *green=0;
+ *blue=0;
+ }
+ else
+ {
+ *red=0;
+ *green=0;
+ *blue=255*pow(-x/xmax,1.0/image_fiddle_factor);
+ }
+ }
+ else if (image_type==MONOCHROME) /* E, energy, permittivity */
+ {
+ if(x > xmax)
+ {
+ *red=0; *green=0; *blue=0;
+ }
+ else
+ {
+ *red=255*pow(fabs(x/xmax),1.0/image_fiddle_factor);
+ *green=255*pow(fabs(x/xmax),1.0/image_fiddle_factor);
+ *blue=255*pow(fabs(x/xmax),1.0/image_fiddle_factor);
+ }
+ }
+ else if (image_type==MIXED) /* Only for permittivity*/
+ {
+ if(oddity[w][h]==CONDUCTOR_ZERO_V)
+ {
+ *red=0; *green=255; *blue=0;
+ }
+ else if(oddity[w][h]==CONDUCTOR_PLUS_ONE_V)
+ {
+ *red=255; *green=0; *blue=0;
+ }
+ else if(oddity[w][h]==CONDUCTOR_MINUS_ONE_V)
+ {
+ *red=0; *green=0; *blue=255;
+ }
+ else
+ {
+ *red=255*pow(fabs(x/xmax),1.0/image_fiddle_factor);
+ *green=255*pow(fabs(x/xmax),1.0/image_fiddle_factor);
+ *blue=255*pow(fabs(x/xmax),1.0/image_fiddle_factor);
+ }
+ }
+ image_dat[offset]=*blue;
+ image_dat[offset+1]=*green;
+ image_dat[offset+2]=*red;
+}