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StelGeodesicGrid Class Reference

Grid of triangles (zones) on the sphere with radius 1, generated by subdividing the icosahedron. More...

#include <StelGeodesicGrid.hpp>

List of all members.

Classes

struct  Triangle

Public Types

typedef void( VisitFunc )(int lev, int index, const Vec3f &c0, const Vec3f &c1, const Vec3f &c2, void *context)

Public Member Functions

 StelGeodesicGrid (int maxLevel)
int getMaxLevel (void) const
int getNrOfZones (void) const
void visitTriangles (int maxVisitLevel, VisitFunc *func, void *context) const
int getZoneNumberForPoint (const Vec3f &v, int searchLevel) const
 Find the zone number in which a given point lies.
void getTriangleCorners (int lev, int index, Vec3f &c0, Vec3f &c1, Vec3f &c2) const
 Return the position of the 3 corners for the triangle at the given level and index.
int getPartnerTriangle (int lev, int index) const
 Return the index of the partner triangle with which to form a parallelogram.
const GeodesicSearchResultsearch (const QVector< SphericalCap > &convex, int maxSearchLevel) const
 Return a search result matching the given spatial region The result is cached, meaning that it is very fast to search the same region consecutively.

Static Public Member Functions

static int nrOfZones (int level)

Detailed Description

Grid of triangles (zones) on the sphere with radius 1, generated by subdividing the icosahedron.

level 0: just the icosahedron, 20 zones level 1: 80 zones, level 2: 320 zones, ... Each zone has a unique integer number in the range [0,getNrOfZones()-1].

Definition at line 47 of file StelGeodesicGrid.hpp.


Member Function Documentation

int StelGeodesicGrid::getPartnerTriangle ( int  lev,
int  index 
) const

Return the index of the partner triangle with which to form a parallelogram.

void StelGeodesicGrid::getTriangleCorners ( int  lev,
int  index,
Vec3f c0,
Vec3f c1,
Vec3f c2 
) const

Return the position of the 3 corners for the triangle at the given level and index.

int StelGeodesicGrid::getZoneNumberForPoint ( const Vec3f v,
int  searchLevel 
) const

Find the zone number in which a given point lies.

prerequisite: v*v==1 When the point lies on the border of two or more zones, one such zone is returned (always the same one, because the algorithm is deterministic).

const GeodesicSearchResult* StelGeodesicGrid::search ( const QVector< SphericalCap > &  convex,
int  maxSearchLevel 
) const

Return a search result matching the given spatial region The result is cached, meaning that it is very fast to search the same region consecutively.

Returns:
a GeodesicSearchResult instance which must be used with GeodesicSearchBorderIterator and GeodesicSearchInsideIterator

The documentation for this class was generated from the following file:
Generated on Thu Jan 31 14:05:45 2013 for Stellarium by  doxygen 1.6.3