X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=Astro%2Forbits.c;h=fe5208c4a9c6e8dd2117cb10fc9414fe3feb009b;hb=20cf326fec07113e0702a7367a162febf0fade88;hp=598ecd7861a1feef1983e7b9cc907299b8f3a82d;hpb=1413fae16c02baf97718797265b5fe4adf393159;p=simgear.git

diff --git a/Astro/orbits.c b/Astro/orbits.c
index 598ecd78..fe5208c4 100644
--- a/Astro/orbits.c
+++ b/Astro/orbits.c
@@ -28,6 +28,7 @@
 
 #include <Astro/orbits.h>
 
+#include <Include/fg_constants.h>
 #include <Include/general.h>
 #include <Time/fg_time.h>
 #include <Main/fg_debug.h>
@@ -37,37 +38,9 @@ struct OrbElements pltOrbElements[9];
 
 double fgCalcActTime(struct fgTIME t)
 {
-   double
-         actTime, UT;
-   int year;
-
-   /* a hack. This one introduces the 2000 problem into the program */
-   year = t.gmt->tm_year + 1900;
-
-   /* calculate the actual time, rember to add 1 to tm_mon! */
-   actTime = 367 * year - 7 *
-	          (year + ((t.gmt->tm_mon+1) + 9) / 12) / 4 + 275 *
-	           (t.gmt->tm_mon+1) / 9 + t.gmt->tm_mday - 730530;
-
-    UT = t.gmt->tm_hour + ((double) t.gmt->tm_min / 60);
-    /*printf("UT = %f\n", UT); */
-    actTime += (UT / 24.0);
-    #define DEBUG 1
-    #ifdef DEBUG
-    /* printf("  Actual Time:\n"); */
-    /* printf("  current day = %f\t", actTime); */
-    /* printf("  GMT = %d, %d, %d, %d, %d, %d\n",
-	   year, t.gmt->tm_mon, t.gmt->tm_mday,
-	   t.gmt->tm_hour, t.gmt->tm_min, t.gmt->tm_sec); */
-    #endif
-    return actTime;
+  return (t.mjd - 36523.5);
 }
 
-/* convert degrees to radians */
-double fgDegToRad(double angle)
-{
-	return (angle * PIOVER180);
-}
 
 double fgCalcEccAnom(double M, double e)
 {
@@ -85,21 +58,33 @@ double fgCalcEccAnom(double M, double e)
             diff = fabs(E0 - E1);
             E0 = E1;
 		}
-        while (diff > fgDegToRad(0.001));
+        while (diff > (DEG_TO_RAD * 0.001));
         return E0;
 	}
     return eccAnom;
 }
 
 
+/* This function assumes that if the FILE ptr is valid that the
+   contents will be valid. Should we check the file for validity? */
+  
+/* Sounds like a good idea to me. What type of checks are you thinking
+   of, other than feof(FILE*)? That's currently the only check I can
+   think of (Durk) */
 
-void fgReadOrbElements(struct OrbElements *dest, FILE *src)
+int fgReadOrbElements(struct OrbElements *dest, FILE *src)
 {
 	char line[256];
     int i,j;
     j = 0;
     do
     {
+ 	if (feof (src)) {
+	    fgPrintf (FG_ASTRO, FG_ALERT,
+		      "End of file found while reading planetary positions:\n");
+ 	    return 0;
+ 	}
+ 
     	fgets(line, 256,src);
         for (i = 0; i < 256; i++)
         {
@@ -110,49 +95,55 @@ void fgReadOrbElements(struct OrbElements *dest, FILE *src)
     }
     while (!(strlen(line)));
     sscanf(line, "%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf,%lf\n",
-    		&dest->NFirst, &dest->NSec,
-            &dest->iFirst, &dest->iSec,
-            &dest->wFirst, &dest->wSec,
-            &dest->aFirst, &dest->aSec,
-            &dest->eFirst, &dest->eSec,
-            &dest->MFirst, &dest->MSec);
+           &dest->NFirst, &dest->NSec,
+           &dest->iFirst, &dest->iSec,
+           &dest->wFirst, &dest->wSec,
+           &dest->aFirst, &dest->aSec,
+           &dest->eFirst, &dest->eSec,
+           &dest->MFirst, &dest->MSec);
+
+    return(1);
 }
 
 
-void fgSolarSystemInit(struct fgTIME t)
+int fgSolarSystemInit(struct fgTIME t)
 {
-   struct fgGENERAL *g;
-   char path[80];
-   int i;
-   FILE *data;
+    struct fgGENERAL *g;
+    char path[80];
+    int i;
+    FILE *data;
+    int ret_val = 0;
 
-   fgPrintf( FG_ASTRO, FG_INFO, "Initializing solar system\n");
+    fgPrintf( FG_ASTRO, FG_INFO, "Initializing solar system\n");
 
    /* build the full path name to the orbital elements database file */
-   g = &general;
-   path[0] = '\0';
-   strcat(path, g->root_dir);
-   strcat(path, "/Scenery/");
-   strcat(path, "Planets.dat");
-
-   if ( (data = fopen(path, "r")) == NULL )
-   {
-	    fgPrintf( FG_ASTRO, FG_ALERT, "Cannot open data file: '%s'\n", path);
-	    return;
-   }
-   #ifdef DEBUG
-   fgPrintf( FG_ASTRO, FG_INFO, "  reading datafile %s\n", path);
-   #endif
-
-   /* for all the objects... */
-   for (i = 0; i < 9; i ++)
-   {
-      /* ...read from the data file ... */
-      fgReadOrbElements(&pltOrbElements[i], data);
-      /* ...and calculate the actual values */
-      fgSolarSystemUpdate(&pltOrbElements[i], t);
-   }
+    g = &general;
+    path[0] = '\0';
+    strcat(path, g->root_dir);
+    strcat(path, "/Scenery/");
+    strcat(path, "Planets.dat");
 
+    if ( (data = fopen(path, "r")) == NULL )
+    {
+	    fgPrintf( FG_ASTRO, FG_ALERT,
+		      "Cannot open data file: '%s'\n", path);
+    } else {
+	/* printf("  reading datafile %s\n", path); */
+	fgPrintf( FG_ASTRO, FG_INFO, "  reading datafile %s\n", path);
+
+	/* for all the objects... */
+	for (i = 0; i < 9; i ++)
+	    {
+		/* ...read from the data file ... */
+		if (!(fgReadOrbElements (&pltOrbElements[i], data))) {
+		    ret_val = 0;
+		}
+		/* ...and calculate the actual values */
+		fgSolarSystemUpdate(&pltOrbElements[i], t);
+	    }
+	ret_val = 1;
+    }
+    return ret_val;
 }
 
 
@@ -164,20 +155,38 @@ void fgSolarSystemUpdate(struct OrbElements *planet, struct fgTIME t)
    actTime = fgCalcActTime(t);
 
    /* calculate the actual orbital elements */
-    planet->M = fgDegToRad(planet->MFirst + (planet->MSec * actTime));	// angle in radians
-    planet->w = fgDegToRad(planet->wFirst + (planet->wSec * actTime));	// angle in radians
-    planet->N = fgDegToRad(planet->NFirst + (planet->NSec * actTime));	// angle in radians
-    planet->i = fgDegToRad(planet->iFirst + (planet->iSec * actTime));  // angle in radians
-    planet->e = planet->eFirst + (planet->eSec * actTime);
-    planet->a = planet->aFirst + (planet->aSec * actTime);
+   planet->M = DEG_TO_RAD * (planet->MFirst + (planet->MSec * actTime));
+   planet->w = DEG_TO_RAD * (planet->wFirst + (planet->wSec * actTime));
+   planet->N = DEG_TO_RAD * (planet->NFirst + (planet->NSec * actTime));
+   planet->i = DEG_TO_RAD * (planet->iFirst + (planet->iSec * actTime));
+   planet->e = planet->eFirst + (planet->eSec * actTime);
+   planet->a = planet->aFirst + (planet->aSec * actTime);
 }
 
 
 /* $Log$
-/* Revision 1.4  1998/01/27 00:47:47  curt
-/* Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
-/* system and commandline/config file processing code.
+/* Revision 1.8  1998/02/23 19:07:55  curt
+/* Incorporated Durk's Astro/ tweaks.  Includes unifying the sun position
+/* calculation code between sun display, and other FG sections that use this
+/* for things like lighting.
 /*
+ * Revision 1.7  1998/02/12 21:59:33  curt
+ * Incorporated code changes contributed by Charlie Hotchkiss
+ * <chotchkiss@namg.us.anritsu.com>
+ *
+ * Revision 1.6  1998/02/03 23:20:11  curt
+ * Lots of little tweaks to fix various consistency problems discovered by
+ * Solaris' CC.  Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
+ * passed arguments along to the real printf().  Also incorporated HUD changes
+ * by Michele America.
+ *
+ * Revision 1.5  1998/02/02 20:53:22  curt
+ * To version 0.29
+ *
+ * Revision 1.4  1998/01/27 00:47:47  curt
+ * Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
+ * system and commandline/config file processing code.
+ *
  * Revision 1.3  1998/01/22 02:59:27  curt
  * Changed #ifdef FILE_H to #ifdef _FILE_H
  *