Clean-up cmake (linker) dependencies.

[flightgear.git] / src / Time / sunsolver.cxx

diff --git a/src/Time/sunsolver.cxx b/src/Time/sunsolver.cxx
index 8a1a78e586df1b9d76bb805f1c286ffc74db0db9..b37112816282f1e061219139f600a770087b47ad 100644 (file)
--- a/src/Time/sunsolver.cxx
+++ b/src/Time/sunsolver.cxx
@@ -27,27 +27,16 @@
 #      include <config.h>
 #endif
 
-#ifdef SG_HAVE_STD_INCLUDES
-#  include <cmath>
-// #  include <cstdio>
-#  include <ctime>
-#  ifdef macintosh
-     SG_USING_STD(time_t);
-#  endif
-#else
-#  include <math.h>
-// #  include <stdio.h>
-#  include <time.h>
-#endif
+#include <cmath>
+#include <ctime>
+#include <cassert>
 
-#include <simgear/math/point3d.hxx>
-#include <simgear/math/sg_geodesy.hxx>
-#include <simgear/ephemeris/ephemeris.hxx>
+#include <simgear/math/SGMath.hxx>
 #include <simgear/timing/sg_time.hxx>
 
 #include <Main/globals.hxx>
+#include <Main/fg_props.hxx>
 
-#include "tmp.hxx"
 #include "sunsolver.hxx"
 
 
@@ -64,62 +53,54 @@ void fgSunPositionGST(double gst, double *lon, double *lat) {
     /* double *lat;            (return) latitude        */
     /* double *lon;            (return) longitude       */
 
-    /* double lambda; */
-    double alpha, delta;
     double tmp;
 
-    double beta = globals->get_ephem()->get_sun()->getLat();
-    double r = globals->get_ephem()->get_sun()->getDistance();
-    double xs = globals->get_ephem()->get_sun()->getxs();
-    double ys = globals->get_ephem()->get_sun()->getys();
-    double ye = globals->get_ephem()->get_sun()->getye();
-    double ze = globals->get_ephem()->get_sun()->getze();
-    alpha = atan2(ys - tan(beta)*ze/ys, xs);
-    delta = asin(sin(beta)*ye/ys + cos(beta)*ze);
-
-    // tmp = alpha - (SGD_2PI/24)*GST(ssue);
-    tmp = alpha - (SGD_2PI/24)*gst;
-    if (tmp < -SGD_PI) {
-        do tmp += SGD_2PI;
-        while (tmp < -SGD_PI);
-    } else if (tmp > SGD_PI) {
-        do tmp -= SGD_2PI;
-        while (tmp < -SGD_PI);
-    }
+    SGPropertyNode* sun = fgGetNode("/ephemeris/sun");
+    assert(sun);
+    double xs = sun->getDoubleValue("xs");
+    //double ys = sun->getDoubleValue("ys");
+    double ye = sun->getDoubleValue("ye");
+    double ze = sun->getDoubleValue("ze");
+    double ra = atan2(ye, xs);
+    double dec = atan2(ze, sqrt(xs * xs + ye * ye));
+
+    tmp = ra - (SGD_2PI/24)*gst;
+    
+    double signedPI = (tmp < 0.0) ? -SGD_PI : SGD_PI;
+    tmp = fmod(tmp+signedPI, SGD_2PI) - signedPI;
 
     *lon = tmp;
-    *lat = delta;
+    *lat = dec;
 }
 
-static double sun_angle( const SGTime &t, sgVec3 world_up,
+static double sun_angle( const SGTime &t, const SGVec3d& world_up,
                          double lon_rad, double lat_rad ) {
-    sgVec3 nup, nsun;
-    Point3D p, rel_sunpos;
-
     SG_LOG( SG_EVENT, SG_DEBUG, "  Updating Sun position" );
     SG_LOG( SG_EVENT, SG_DEBUG, "  Gst = " << t.getGst() );
 
-    double sun_lon, sun_gd_lat;
-    fgSunPositionGST( t.getGst(), &sun_lon, &sun_gd_lat );
-    Point3D sunpos = sgGeodToCart(Point3D(sun_lon, sun_gd_lat, 0));
+    double sun_lon, sun_gc_lat;
+    fgSunPositionGST( t.getGst(), &sun_lon, &sun_gc_lat );
+    SGVec3d sunpos = SGVec3d::fromGeoc(SGGeoc::fromRadM(sun_lon, sun_gc_lat,
+                                                        SGGeodesy::EQURAD));
 
     SG_LOG( SG_EVENT, SG_DEBUG, "    t.cur_time = " << t.get_cur_time() );
     SG_LOG( SG_EVENT, SG_DEBUG, 
-           "    Sun Geodetic lat = " << sun_gd_lat );
+           "    Sun Geocentric lat = " << sun_gc_lat );
 
     // calculate the sun's relative angle to local up
-    sgCopyVec3( nup, world_up );
-    sgSetVec3( nsun, sunpos.x(), sunpos.y(), sunpos.z() );
-    sgNormalizeVec3(nup);
-    sgNormalizeVec3(nsun);
+    SGVec3d nup = normalize(world_up);
+    SGVec3d nsun = normalize(sunpos);
     // cout << "nup = " << nup[0] << "," << nup[1] << "," 
     //      << nup[2] << endl;
     // cout << "nsun = " << nsun[0] << "," << nsun[1] << "," 
     //      << nsun[2] << endl;
 
-    double sun_angle = acos( sgScalarProductVec3 ( nup, nsun ) );
+    double sun_angle = acos( dot( nup, nsun ) );
+
+    double signedPI = (sun_angle < 0.0) ? -SGD_PI : SGD_PI;
+    sun_angle = fmod(sun_angle+signedPI, SGD_2PI) - signedPI;
+
     double sun_angle_deg = sun_angle * SG_RADIANS_TO_DEGREES;
-    while ( sun_angle_deg < -180 ) { sun_angle += 360; }
     SG_LOG( SG_EVENT, SG_DEBUG, "sun angle relative to current location = "
            << sun_angle_deg );
 
@@ -143,10 +124,7 @@ time_t fgTimeSecondsUntilSunAngle( time_t cur_time,
 {
     // cout << "location = " << lon_rad * SG_RADIANS_TO_DEGREES << ", "
     //      << lat_rad * SG_RADIANS_TO_DEGREES << endl;
-    Point3D geod( lon_rad, lat_rad, 0 );
-    Point3D tmp = sgGeodToCart( geod );
-    sgVec3 world_up;
-    sgSetVec3( world_up, tmp.x(), tmp.y(), tmp.z() );
+    SGVec3d world_up = SGVec3d::fromGeod(SGGeod::fromRad(lon_rad, lat_rad));
     SGTime t = SGTime( lon_rad, lat_rad, "", 0 );
 
     double best_diff = 180.0;