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CloseStarPicker Class Reference

Inheritance diagram for CloseStarPicker:

Inheritance graph
Collaboration diagram for CloseStarPicker:

Collaboration graph
List of all members.

Public Member Functions

 CloseStarPicker (const UniversalCoord &pos, const Vec3f &dir, double t, float _maxDistance, float angle)
void process (const Star &star, float distance, float appMag)
 ~CloseStarPicker ()

Public Attributes

float closestDistance
const Star * closestStar
float maxDistance
double now
Vec3f pickDir
UniversalCoord pickOrigin
double sinAngle2Closest

Constructor & Destructor Documentation

CloseStarPicker::CloseStarPicker (  const UniversalCoord &  pos,
const Vec3f &  dir,
double  t,
float  _maxDistance,
float  angle
) 
 

Definition at line 596 of file universe.cpp.

References ANGULAR_RES, and sin().

00600                                               :
00601     pickOrigin(pos),
00602     pickDir(dir),
00603     now(t),
00604     maxDistance(_maxDistance),
00605     closestStar(NULL),
00606     closestDistance(0.0f),
00607     sinAngle2Closest(sin(angle/2.0) > ANGULAR_RES ? sin(angle/2.0) : 
00608                                       ANGULAR_RES )
00609 {
00610 }

CloseStarPicker::~CloseStarPicker (   )  [inline]
 

Definition at line 582 of file universe.cpp.

00582 {};

Member Function Documentation

void CloseStarPicker::process (  const Star &  star,
float  distance,
float  appMag
)  [virtual]
 

Implements OctreeProcessor< Star, float >.

Definition at line 612 of file universe.cpp.

References ANGULAR_RES, closestDistance, closestStar, distance(), maxDistance, astro::microLightYearsToKilometers(), now, pickDir, pickOrigin, sinAngle2Closest, sqrt(), testIntersection(), Vector3< T >::x, Vector3< T >::y, and Vector3< T >::z.

00615 {
00616     if (lowPrecDistance > maxDistance)
00617         return;
00618 
00619     Vec3d hPos = (star.getPosition(now) - pickOrigin) * 
00620         astro::microLightYearsToKilometers(1.0);
00621     Vec3f starDir((float) hPos.x, (float) hPos.y, (float) hPos.z);
00622     float distance = 0.0f;
00623 
00624      if (testIntersection(Ray3f(Point3f(0, 0, 0), pickDir),
00625                          Spheref(Point3f(starDir.x, starDir.y, starDir.z),
00626                                  star.getRadius()), distance))
00627     {
00628         if (distance > 0.0f)
00629         {
00630             if (closestStar == NULL || distance < closestDistance)
00631             {
00632                 closestStar = &star;
00633                 closestDistance = starDir.length();
00634                 sinAngle2Closest = ANGULAR_RES; 
00635                 // An exact hit--set the angle to "zero"
00636             }
00637         }
00638     }
00639     else
00640     {
00641         // We don't have an exact hit; check to see if we're close enough
00642         float distance = starDir.length();
00643         starDir.normalize();
00644         Vec3f starMiss = starDir - pickDir;
00645         Vec3d sMd = Vec3d(starMiss.x, starMiss.y, starMiss.z ); 
00646     
00647         double sinAngle2 = sqrt(sMd * sMd)/2.0;
00648 
00649         if (sinAngle2 <= sinAngle2Closest &&
00650             (closestStar == NULL || distance < closestDistance))
00651         {
00652             closestStar = &star;
00653             closestDistance = distance;
00654             sinAngle2Closest = sinAngle2 > ANGULAR_RES ? sinAngle2 : ANGULAR_RES;
00655         }
00656     }
00657 }

Member Data Documentation

float CloseStarPicker::closestDistance
 

Definition at line 591 of file universe.cpp.

Referenced by process().

const Star* CloseStarPicker::closestStar
 

Definition at line 590 of file universe.cpp.

Referenced by Universe::pickStar(), and process().

float CloseStarPicker::maxDistance
 

Definition at line 589 of file universe.cpp.

Referenced by process().

double CloseStarPicker::now
 

Definition at line 588 of file universe.cpp.

Referenced by process().

Vec3f CloseStarPicker::pickDir
 

Definition at line 587 of file universe.cpp.

Referenced by process().

UniversalCoord CloseStarPicker::pickOrigin
 

Definition at line 586 of file universe.cpp.

Referenced by process().

double CloseStarPicker::sinAngle2Closest
 

Definition at line 592 of file universe.cpp.

Referenced by process().

The documentation for this class was generated from the following file:
Generated on Sat Jan 14 22:33:11 2006 for Celestia by  doxygen 1.4.1