projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 9379b88e | 1 | /*- |
| 01cd45a8 KB |
2 | * Copyright (c) 1983, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. | |
| 9379b88e KB |
4 | * |
| 5 | * %sccs.include.proprietary.c% | |
| 6 | */ | |
| 7 | ||
| 232d9b7d | 8 | #ifndef lint |
| 01cd45a8 | 9 | static char sccsid[] = "@(#)space.c 8.1 (Berkeley) %G%"; |
| 9379b88e | 10 | #endif /* not lint */ |
| 232d9b7d RC |
11 | |
| 12 | #include "aed.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 | int xscale, yscale, xsize, ysize; | |
| 29 | xscale = (GRXMAX<<12)/(x1-x0); | |
| 30 | yscale = (GRYMAX<<12)/(y1-y0); | |
| 31 | if (xscale > yscale) scale = yscale; | |
| 32 | else scale = xscale; | |
| 33 | scale = (scale*9)/10 - 1; | |
| 34 | if (scale<1) scale = 1; | |
| 35 | xsize = (2048*GRXMAX)/scale + 1; | |
| 36 | xbot = (x1+x0)/2 - xsize; | |
| 37 | ysize = (2048*GRYMAX)/scale + 1; | |
| 38 | ybot = (y1+y0)/2 - ysize; | |
| 39 | } |