Map2D(API)

General/Map2D is API to calculate the coordinates depending on 2D projection method of a sphere.

struct

typedef float Map2DParaTypeReal;
typedef long  Map2DParaTypeInteger;

API

Calculation of coordinates by Projection Mode

Input: rotx, roty: Rotation angle, nx, ny: Divide number, mode: Projection Mode
Output: x, y: coordinates of image

extern void map2DCoordGet(Map2DParaTypeReal* x,   Map2DParaTypeReal* y,
				  Map2DParaTypeReal rotx, Map2DParaTypeReal roty,
				  long nx, long ny, long mode);

mode	Projection Mode
0	Mercator
1	Mollweide

Calculation of number and delta angle for each latitude

Input: latitude: Latitude, nparallel: Divide number, mode: Projection Mode
Output: n: Number of images to draw, d: Delta of equator angle of images to draw

extern void map2DParallelInfo(Map2DParaTypeInteger* n, 
				  Map2DParaTypeReal*    d,
				  Map2DParaTypeReal     latitude,
				  Map2DParaTypeInteger  nparallel,
				  long mode);

mode	Projection Mode
0	Mercator
1	Mollweide