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Annotation of 43BSDReno/lib/libplot/grn/space.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980, 1986 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[] = "@(#)space.c    6.1 (Berkeley) 8/29/86";
        !             9: #endif not lint
        !            10: 
        !            11: 
        !            12: #include "grnplot.h"
        !            13: 
        !            14: /*---------------------------------------------------------
        !            15:  *     Space sets up the world-to-screen transformation so
        !            16:  *     that the rectangular area described by (x0, y0) and
        !            17:  *     (x1, y1) will all be on-screen.
        !            18:  *
        !            19:  *     Results:        None.
        !            20:  *
        !            21:  *     Side Effects:
        !            22:  *     Our own variables scale, xbot, and ybot are changed.
        !            23:  *---------------------------------------------------------
        !            24:  */
        !            25: space(x0, y0, x1, y1)
        !            26: int x0, y0, x1, y1;
        !            27: {
        !            28:     double xscale=0.0, yscale=0.0;
        !            29:     if (x1>x0)
        !            30:            xscale = GRXMAX/(double)(x1-x0);
        !            31:     if (y1>y0)
        !            32:            yscale = GRYMAX/(double)(y1-y0);
        !            33:     scale = (xscale > yscale && yscale > 0)? yscale : xscale;
        !            34:     if (scale == 0.0) scale == 1.0;
        !            35:     xbot = x0;
        !            36:     ybot = y0;
        !            37: }

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