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toucholap.c revision 1.6 
      1 /*
      2  * Copyright (c) 1981, 1993, 1994
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)toucholap.c	8.2 (Berkeley) 5/4/94";
     36 #endif /* not lint */
     37 
     38 #include "curses.h"
     39 
     40 /*
     41  * touchoverlap --
     42  *	Touch, on win2, the part that overlaps with win1.
     43  */
     44 int
     45 touchoverlap(win1, win2)
     46 	register WINDOW *win1, *win2;
     47 {
     48 	register int y, endy, endx, starty, startx;
     49 
     50 #ifdef DEBUG
     51 	__CTRACE("touchoverlap: (%0.2o, %0.2o);\n", win1, win2);
     52 #endif
     53 	starty = max(win1->begy, win2->begy);
     54 	startx = max(win1->begx, win2->begx);
     55 	endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
     56 	endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
     57 #ifdef DEBUG
     58 	__CTRACE("touchoverlap: from (%d,%d) to (%d,%d)\n",
     59 	    starty, startx, endy, endx);
     60 	__CTRACE("touchoverlap: win1 (%d,%d) to (%d,%d)\n",
     61 	    win1->begy, win1->begx, win1->begy + win1->maxy,
     62 	    win1->begx + win1->maxx);
     63 	__CTRACE("touchoverlap: win2 (%d,%d) to (%d,%d)\n",
     64 	    win2->begy, win2->begx, win2->begy + win2->maxy,
     65 	    win2->begx + win2->maxx);
     66 #endif
     67 	if (starty >= endy || startx >= endx)
     68 		return (OK);
     69 	starty -= win2->begy;
     70 	startx -= win2->begx;
     71 	endy -= win2->begy;
     72 	endx -= win2->begx;
     73 	for (--endx, y = starty; y < endy; y++)
     74 		__touchline(win2, y, startx, endx, 0);
     75 	return (OK);
     76 }
     77 
     78