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Annotation of 43BSDTahoe/usr.lib/libplot/hp2648/circle.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)circle.c   5.1 (Berkeley) 5/7/85";
        !             9: #endif not lint
        !            10: 
        !            11: #include "hp2648.h"
        !            12: 
        !            13: circle (xc,yc,r)
        !            14: int xc,yc,r;
        !            15: {
        !            16:        double costheta,sintheta,x,y,xn;
        !            17:        int xi,yi;
        !            18: 
        !            19:        if(r<1){
        !            20:                point(xc,yc);
        !            21:                return;
        !            22:        }
        !            23:        sintheta = 1.0/r;
        !            24:        costheta = pow(1-sintheta*sintheta,0.5);
        !            25:        xi = x = r;
        !            26:        yi = y = 0;
        !            27:        do {
        !            28:                point(xc+xi,yc+yi);
        !            29:                xn = x;
        !            30:                xi = x = x*costheta + y*sintheta;
        !            31:                yi = y = y*costheta - xn*sintheta;
        !            32:        } while( ! (yi==0 && xi >= r-1));
        !            33: }

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