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Annotation of 43BSDTahoe/usr.lib/libplot/grn/space.c, revision 1.1.1.1

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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