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math domain error fix from Charlie Hotchkiss.

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curt 1998-12-04 01:25:05 +00:00 committed by Tim Moore
parent 46f79f17c8
commit 2198498e29
1 changed files with 14 additions and 2 deletions
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16
Astro/celestialBody.cxx
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@ -27,7 +27,7 @@
#include "star.hxx"
#include <Debug/logstream.hxx>
#ifdef __BORLANDC__
#ifdef FG_MATH_EXCEPTION_CLASH
# define exception c_exception
#endif
#include <math.h>
@ -90,7 +90,19 @@ void CelestialBody::updatePosition(fgTIME *t, Star *ourSun)
//of the planet
R = sqrt (xg*xg + yg*yg + zg*zg);
s = ourSun->getDistance();
FV = RAD_TO_DEG * acos( (r*r + R*R - s*s) / (2*r*R));
// It is possible from these calculations for the argument to acos
// to exceed the valid range for acos(). So we do a little extra
// checking.
double tmp = (r*r + R*R - s*s) / (2*r*R);
if ( tmp > 1.0) {
tmp = 1.0;
} else if ( tmp < -1.0) {
tmp = -1.0;
}
FV = RAD_TO_DEG * acos( tmp );
};
/****************************************************************************