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#pragma lib "/sys/src/cmd/map/libmap/libmap.a$O"
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#pragma src "/sys/src/cmd/map/libmap"
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#ifndef PI
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#define PI 3.1415926535897932384626433832795028841971693993751
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#endif
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#define TWOPI (2*PI)
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#define RAD (PI/180)
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double hypot(double, double); /* sqrt(a*a+b*b) */
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double tan(double); /* not in K&R library */
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#define ECC .08227185422 /* eccentricity of earth */
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#define EC2 .006768657997
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#define FUZZ .0001
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#define UNUSED 0.0 /* a dummy double parameter */
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struct coord {
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double l; /* lat or lon in radians*/
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double s; /* sin */
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double c; /* cos */
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};
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struct place {
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struct coord nlat;
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struct coord wlon;
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};
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typedef int (*proj)(struct place *, double *, double *);
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struct index { /* index of known projections */
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char *name; /* name of projection */
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proj (*prog)(double, double);
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/* pointer to projection function */
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int npar; /* number of params */
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int (*cut)(struct place *, struct place *, double *);
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/* function that handles cuts--eg longitude 180 */
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int poles; /*1 S pole is a line, 2 N pole is, 3 both*/
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int spheroid; /* poles must be at 90 deg if nonzero */
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int (*limb)(double *lat, double *lon, double resolution);
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/* get next place on limb */
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/* return -1 if done, 0 at gap, else 1 */
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};
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proj aitoff(void);
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proj albers(double, double);
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int Xazequalarea(struct place *, double *, double *);
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proj azequalarea(void);
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int Xazequidistant(struct place *, double *, double *);
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proj azequidistant(void);
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proj bicentric(double);
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proj bonne(double);
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proj conic(double);
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proj cylequalarea(double);
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int Xcylindrical(struct place *, double *, double *);
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proj cylindrical(void);
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proj elliptic(double);
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proj fisheye(double);
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proj gall(double);
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proj gilbert(void);
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proj globular(void);
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proj gnomonic(void);
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int guycut(struct place *, struct place *, double *);
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int Xguyou(struct place *, double *, double *);
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proj guyou(void);
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proj harrison(double, double);
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int hexcut(struct place *, struct place *, double *);
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proj hex(void);
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proj homing(double);
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int hlimb(double*, double*, double resolution);
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proj lagrange(void);
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proj lambert(double, double);
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proj laue(void);
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proj lune(double, double);
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proj loxodromic(double); /* not in library */
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proj mecca(double);
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int mlimb(double*, double*, double resolution);
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proj mercator(void);
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proj mollweide(void);
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proj newyorker(double);
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proj ortelius(double, double); /* not in library */
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int Xorthographic(struct place *place, double *x, double *y);
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proj orthographic(void);
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int olimb(double*, double*, double);
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proj perspective(double);
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int plimb(double*, double*, double resolution);
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int Xpolyconic(struct place *, double *, double *);
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proj polyconic(void);
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proj rectangular(double);
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proj simpleconic(double, double);
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int Xsinusoidal(struct place *, double *, double *);
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proj sinusoidal(void);
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proj sp_albers(double, double);
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proj sp_mercator(void);
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proj square(void);
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int Xstereographic(struct place *, double *, double *);
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proj stereographic(void);
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int Xtetra(struct place *, double *, double *);
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int tetracut(struct place *, struct place *, double *);
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proj tetra(void);
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proj trapezoidal(double, double);
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proj vandergrinten(void);
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proj wreath(double, double); /* not in library */
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void findxy(double, double *, double *);
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void albscale(double, double, double, double);
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void invalb(double, double, double *, double *);
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void cdiv(double, double, double, double, double *, double *);
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void cmul(double, double, double, double, double *, double *);
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void cpow(double, double, double *, double *, double);
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void csq(double, double, double *, double *);
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void csqrt(double, double, double *, double *);
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void ccubrt(double, double, double *, double *);
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double cubrt(double);
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int elco2(double, double, double, double, double, double *, double *);
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void cdiv2(double, double, double, double, double *, double *);
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void csqr(double, double, double *, double *);
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void orient(double, double, double);
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void latlon(double, double, struct place *);
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void deg2rad(double, struct coord *);
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void sincos(struct coord *);
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void normalize(struct place *);
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void invert(struct place *);
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void norm(struct place *, struct place *, struct coord *);
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void printp(struct place *);
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void copyplace(struct place *, struct place *);
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int picut(struct place *, struct place *, double *);
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int ckcut(struct place *, struct place *, double);
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double reduce(double);
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void getsyms(char *);
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int putsym(struct place *, char *, double, int);
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void filerror(char *s, char *f);
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void error(char *s);
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int doproj(struct place *, int *, int *);
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int cpoint(int, int, int);
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int plotpt(struct place *, int);
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int nocut(struct place *, struct place *, double *);
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extern int (*projection)(struct place *, double *, double *);
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