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Annotation of researchv10no/cmd/pico/ptan.c, revision 1.1.1.1

1.1       root        1: static qatan2(), Qatan2();
                      2: 
                      3: patan2(xx, yy)
                      4: {
                      5:        register x, y;
                      6:        x=abs(xx);
                      7:        y=abs(yy);
                      8:        if(xx>=0 && yy>=0)
                      9:                return(qatan2(x, y));
                     10:        if(xx<0 && yy<=0)
                     11:                return(180+qatan2(x, y));
                     12:        if(xx<0 && yy>0)
                     13:                return(180-qatan2(x, y));
                     14:        return(360-qatan2(x, y));
                     15: }
                     16: 
                     17: static
                     18: qatan2(x, y)
                     19:        register x, y;
                     20: {
                     21:        if(x<y)
                     22:                return(90-(45*((long)x)/y));
                     23:        if(y==0)
                     24:                return(0);
                     25:        return(45*((long)y)/x);
                     26: }
                     27: 
                     28: Patan2(xx, yy)
                     29: {      return 100*patan2(xx,yy);
                     30: /*     register x, y;
                     31:        x=abs(xx);
                     32:        y=abs(yy);
                     33:        if(xx>=0 && yy>=0)
                     34:                return(Qatan2(x, y));
                     35:        if(xx<0 && yy<=0)
                     36:                return(18000+Qatan2(x, y));
                     37:        if(xx<0 && yy>0)
                     38:                return(18000-Qatan2(x, y));
                     39:        return(36000-Qatan2(x, y));
                     40: */
                     41: }
                     42: /*
                     43: static
                     44: Qatan2(x, y)
                     45:        register x, y;
                     46: {
                     47:        if(x<y)
                     48:                return(9000-(45*((long)(x*100))/y));
                     49:        if(y==0)
                     50:                return(0);
                     51:        return(45*((long)(y*100))/x);
                     52: }
                     53: */

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