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Annotation of 43BSDReno/lib/libplot/aed/space.c, revision 1.1.1.1

1.1       root        1: #ifndef lint
                      2: static char sccsid[] = "@(#)space.c    4.1 (Berkeley) 11/11/83";
                      3: #endif
                      4: 
                      5: #include "aed.h"
                      6: 
                      7: /*---------------------------------------------------------
                      8:  *     Space sets up the world-to-screen transformation so
                      9:  *     that the rectangular area described by (x0, y0) and
                     10:  *     (x1, y1) will all be on-screen.
                     11:  *
                     12:  *     Results:        None.
                     13:  *
                     14:  *     Side Effects:
                     15:  *     Our own variables scale, xbot, and ybot are changed.
                     16:  *---------------------------------------------------------
                     17:  */
                     18: space(x0, y0, x1, y1)
                     19: int x0, y0, x1, y1;
                     20: {
                     21:     int xscale, yscale, xsize, ysize;
                     22:     xscale = (GRXMAX<<12)/(x1-x0);
                     23:     yscale = (GRYMAX<<12)/(y1-y0);
                     24:     if (xscale > yscale) scale = yscale;
                     25:     else scale = xscale;
                     26:     scale = (scale*9)/10 - 1;
                     27:     if (scale<1) scale = 1;
                     28:     xsize = (2048*GRXMAX)/scale + 1;
                     29:     xbot = (x1+x0)/2 - xsize;
                     30:     ysize = (2048*GRYMAX)/scale + 1;
                     31:     ybot = (y1+y0)/2 - ysize;
                     32: }

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