ref: 02a26802ffbd64ebf993119e1599920ffee01ef0
dir: /sys/src/cmd/scat/util.c/
#include <u.h> #include <libc.h> #include <bio.h> #include "sky.h" double PI_180 = 0.0174532925199432957692369; double TWOPI = 6.2831853071795864769252867665590057683943387987502; double LN2 = 0.69314718055994530941723212145817656807550013436025; static double angledangle=(180./PI)*MILLIARCSEC; int rint(char *p, int n) { int i=0; while(*p==' ' && n) p++, --n; while(n--) i=i*10+*p++-'0'; return i; } DAngle dangle(Angle angle) { return angle*angledangle; } Angle angle(DAngle dangle) { return dangle/angledangle; } double rfloat(char *p, int n) { double i, d=0; while(*p==' ' && n) p++, --n; if(*p == '+') return rfloat(p+1, n-1); if(*p == '-') return -rfloat(p+1, n-1); while(*p == ' ' && n) p++, --n; if(n == 0) return 0.0; while(n-- && *p!='.') d = d*10+*p++-'0'; if(n <= 0) return d; p++; i = 1; while(n--) d+=(*p++-'0')/(i*=10.); return d; } int sign(int c) { if(c=='-') return -1; return 1; } char* hms(Angle a) { static char buf[20]; double x; int h, m, s, ts; x=DEG(a)/15; x += 0.5/36000.; /* round up half of 0.1 sec */ h = floor(x); x -= h; x *= 60; m = floor(x); x -= m; x *= 60; s = floor(x); x -= s; ts = 10*x; sprint(buf, "%dh%.2dm%.2d.%ds", h, m, s, ts); return buf; } char* dms(Angle a) { static char buf[20]; double x; int sign, d, m, s, ts; x = DEG(a); sign='+'; if(a<0){ sign='-'; x=-x; } x += 0.5/36000.; /* round up half of 0.1 arcsecond */ d = floor(x); x -= d; x *= 60; m = floor(x); x -= m; x *= 60; s = floor(x); x -= s; ts = floor(10*x); sprint(buf, "%c%d°%.2d'%.2d.%d\"", sign, d, m, s, ts); return buf; } char* ms(Angle a) { static char buf[20]; double x; int d, m, s, ts; x = DEG(a); x += 0.5/36000.; /* round up half of 0.1 arcsecond */ d = floor(x); x -= d; x *= 60; m = floor(x); x -= m; x *= 60; s = floor(x); x -= s; ts = floor(10*x); if(d != 0) sprint(buf, "%d°%.2d'%.2d.%d\"", d, m, s, ts); else sprint(buf, "%.2d'%.2d.%d\"", m, s, ts); return buf; } char* hm(Angle a) { static char buf[20]; double x; int h, m, n; x = DEG(a)/15; x += 0.5/600.; /* round up half of tenth of minute */ h = floor(x); x -= h; x *= 60; m = floor(x); x -= m; x *= 10; n = floor(x); sprint(buf, "%dh%.2d.%1dm", h, m, n); return buf; } char* hm5(Angle a) { static char buf[20]; double x; int h, m; x = DEG(a)/15; x += 2.5/60.; /* round up 2.5m */ h = floor(x); x -= h; x *= 60; m = floor(x); m -= m % 5; sprint(buf, "%dh%.2dm", h, m); return buf; } char* dm(Angle a) { static char buf[20]; double x; int sign, d, m, n; x = DEG(a); sign='+'; if(a<0){ sign='-'; x=-x; } x += 0.5/600.; /* round up half of tenth of arcminute */ d = floor(x); x -= d; x *= 60; m = floor(x); x -= m; x *= 10; n = floor(x); sprint(buf, "%c%d°%.2d.%.1d'", sign, d, m, n); return buf; } char* deg(Angle a) { static char buf[20]; double x; int sign, d; x = DEG(a); sign='+'; if(a<0){ sign='-'; x=-x; } x += 0.5; /* round up half degree */ d = floor(x); sprint(buf, "%c%d°", sign, d); return buf; } char* getword(char *ou, char *in) { int c; for(;;) { c = *in++; if(c == ' ' || c == '\t') continue; if(c == 0) return 0; break; } if(c == '\'') for(;;) { if(c >= 'A' && c <= 'Z') c += 'a' - 'A'; *ou++ = c; c = *in++; if(c == 0) return 0; if(c == '\'') { *ou = 0; return in-1; } } for(;;) { if(c >= 'A' && c <= 'Z') c += 'a' - 'A'; *ou++ = c; c = *in++; if(c == ' ' || c == '\t' || c == 0) { *ou = 0; return in-1; } } } /* * Read formatted angle. Must contain no embedded blanks */ Angle getra(char *p) { Rune r; char *q; Angle f, d; int neg; neg = 0; d = 0; while(*p == ' ') p++; for(;;) { if(*p == ' ' || *p=='\0') goto Return; if(*p == '-') { neg = 1; p++; } if(*p == '+') { neg = 0; p++; } q = p; f = strtod(p, &q); if(q > p) { p = q; } p += chartorune(&r, p); switch(r) { default: Return: if(neg) d = -d; return RAD(d); case 'h': d += f*15; break; case 'm': d += f/4; break; case 's': d += f/240; break; case L'°': d += f; break; case '\'': d += f/60; break; case '\"': d += f/3600; break; } } } double xsqrt(double a) { if(a < 0) return 0; return sqrt(a); } Angle dist(Angle ra1, Angle dec1, Angle ra2, Angle dec2) { double a; a = sin(dec1) * sin(dec2) + cos(dec1) * cos(dec2) * cos(ra1 - ra2); a = atan2(xsqrt(1 - a*a), a); if(a < 0) a = -a; return a; } int dogamma(Pix c) { float f; f = c - gam.min; if(f < 1) f = 1; if(gam.absgamma == 1) c = f * gam.mult2; else c = exp(log(f*gam.mult1) * gam.absgamma) * 255; if(c > 255) c = 255; if(gam.neg) c = 255-c; return c; }