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- #include <stdio.h>
- #include <math.h>
-
-
- typedef struct {
- float h,s,v;
- } hsvpix_t;
-
- static void HSVtoRGB( float *r, float *g, float *b, hsvpix_t pix )
- {
- int i;
- double f, p, q, t, h;
-
- if( pix.s == 0 ) {
- // achromatic (grey)
- *r = *g = *b = pix.v;
- return;
- }
-
- h = pix.h/60; // sector 0 to 5
- i = floor( h );
- f = h - i; // factorial part of h
- p = pix.v * ( 1 - pix.s );
- q = pix.v * ( 1 - pix.s * f );
- t = pix.v * ( 1 - pix.s * ( 1 - f ) );
-
- switch( i ) {
- case 0:
- *r = pix.v; *g = t; *b = p;
- break;
- case 1:
- *r = q; *g = pix.v; *b = p;
- break;
- case 2:
- *r = p; *g = pix.v; *b = t;
- break;
- case 3:
- *r = p; *g = q; *b = pix.v;
- break;
- case 4:
- *r = t; *g = p; *b = pix.v;
- break;
- default: // case 5:
- *r = pix.v; *g = p; *b = q;
- break;
- }
-
- }
-
- static struct {
- float Vthresold;
- float Tthresold;
- hsvpix_t CloudTop;
- hsvpix_t CloudBot;
- hsvpix_t SeaTop;
- hsvpix_t SeaBot;
- hsvpix_t GroundTop;
- hsvpix_t GroundBot;
- } fcinfo= {
- 30.0,
- 170.0,
- {0,0.0,0.3},{0,0.0,1.0},
- {240.0,0.9,0.5},{220.0,0.8,0.8},
- {90.0,0.8,0.3},{50.0,0.8,1.0}
- };
-
- void readfconf(char *file)
- {
- FILE * fin;
-
- fin=fopen(file,"r");
- if(fin==NULL) return;
-
- fscanf(fin,"%g\n",&fcinfo.Vthresold);
- fscanf(fin,"%g\n",&fcinfo.Tthresold);
- fscanf(fin,"%g %g %g\n",&fcinfo.CloudTop.h,&fcinfo.CloudTop.s,&fcinfo.CloudTop.v);
- fscanf(fin,"%g %g %g\n",&fcinfo.CloudBot.h,&fcinfo.CloudBot.s,&fcinfo.CloudBot.v);
- fscanf(fin,"%g %g %g\n",&fcinfo.SeaTop.h,&fcinfo.SeaTop.s,&fcinfo.SeaTop.v);
- fscanf(fin,"%g %g %g\n",&fcinfo.SeaBot.h,&fcinfo.SeaBot.s,&fcinfo.SeaBot.v);
- fscanf(fin,"%g %g %g\n",&fcinfo.GroundTop.h,&fcinfo.GroundTop.s,&fcinfo.GroundTop.v);
- fscanf(fin,"%g %g %g\n",&fcinfo.GroundBot.h,&fcinfo.GroundBot.s,&fcinfo.GroundBot.v);
-
- fclose(fin);
-
- };
-
- void falsecolor(double v, double t, float *r, float *g, float *b)
- {
- hsvpix_t top,bot,c;
- double scv,sct;
-
- if(v <= fcinfo.Vthresold) {
- /* sea */
- top=fcinfo.SeaTop,bot=fcinfo.SeaBot;
- scv=v/fcinfo.Vthresold;
- sct=t/255.0;
- } else {
- if(t<=fcinfo.Tthresold) {
- /* clouds */
- top=fcinfo.CloudTop,bot=fcinfo.CloudBot;
- scv=(v-fcinfo.Vthresold)/(255.0-fcinfo.Vthresold);
- sct=t/fcinfo.Tthresold;
- } else {
- /* ground */
- top=fcinfo.GroundTop,bot=fcinfo.GroundBot;
- scv=(v-fcinfo.Vthresold)/(255.0-fcinfo.Vthresold);
- sct=(t-fcinfo.Tthresold)/(255.0-fcinfo.Tthresold);
- }
- };
-
- c.h=top.h+sct*(bot.h-top.h);
- c.v=top.v+scv*(bot.v-top.v);
- c.s=top.s+scv*sct*(bot.s-top.s);
-
- HSVtoRGB( r, g, b, c );
- };
-
-
-
-
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