//  sphcoord.h
//
//  by John D. de Boer


//  Bounds of perspective views and projected spheres

typedef struct {
real north,south,  //  bounds of polar coordinate
     west,east;    //  bounds of azimuth coordinate
} sphererect;

typedef struct {
sphererect max,    //  range of coordinate lines appearing in view at all
           min;    //  range of coordinate lines which cross view completely
bool       north,  //  whether north pole is in view
           south;  //  whether south pole is in view
} spherebounds;


//  Type definition for a call-back function

typedef void (*sphmapptr)(const projection *P, const vector *V, image *D);


//  The "spheretask" type.  All of the long values in a spheretask are in minutes of arc

typedef struct {
window       *wind;     //  the window
projection   *proj;     //  the projection
spherebounds bound;     //  the coordinate lines which cross the view
sphmapptr    map;       //  routine to transform a unit vector on the sphere into view coordinates
bool         hour;      //  whether azimuth scale is in hours
long         lat1,      //  southern latitude bound
             lat2,      //  northern latitude bound
             long1,     //  western longitude bound
             long2,     //  eastern longitude bound
             dlat,      //  spacing of latitude lines
             dlong,     //  spacing of longitude lines
             mlat,      //  spacing between latitude lines of greater significance
             mlong,     //  spacing between longitude lines of greater significance
             longintv,  //  spacing of longitude ticks
             latintv;   //  spacing of latitude ticks
real         ticklat,   //  latitude of longitude ticks
             ticklong;  //  longitude of latitude ticks
colour       c2nd,      //  default line colour
             c1st;      //  colour of lines of greater significance
} spheretask;


void setspheretaskradius(spheretask *ST, real F, bool Hour);
void initspheretask(spheretask *ST, window *W, projection *P, bool Globe, real Margin, sphmapptr Map, bool Hour);

void drawsphericalcoords(spheretask *ST);
void drawequator(spheretask *ST);
void drawdashedequator(spheretask *ST);
void drawprimemeridian(spheretask *ST, bool Colure);
void coordtick(spheretask *ST, real LAT, real LONG, image *D, char Dir, vector *U);