| #ifndef lint |
| static char sccsid[] = "@(#)ti.c 4.2 8/11/83"; |
| #endif |
| |
| /* ti.c: classify line intersections */ |
| # include "t..c" |
| /* determine local environment for intersections */ |
| |
| extern int lefdata(int i,int c); |
| extern int allh(int i); |
| extern int thish(int i,int c); |
| |
| int up1(int i); |
| |
| int interv(int i,int c) |
| { |
| int ku, kl; |
| if (c>=ncol || c == 0) |
| { |
| if (dboxflg) |
| { |
| if (i==0) return(BOT); |
| if (i>=nlin) return(TOP); |
| return(THRU); |
| } |
| if (c>=ncol) |
| return(0); |
| } |
| ku = i>0 ? lefdata(i-1,c) : 0; |
| if (i+1 >= nlin) |
| kl=0; |
| else |
| kl = lefdata(allh(i) ? i+1 : i, c); |
| if (ku==2 && kl==2) return(THRU); |
| if (ku ==2) return(TOP); |
| if (kl==BOT) return(2); |
| return(0); |
| } |
| |
| int interh(int i,int c) |
| { |
| int kl, kr; |
| if (fullbot[i]== '=' || (dboxflg && (i==0 || i>= nlin-1))) |
| { |
| if (c==ncol) |
| return(LEFT); |
| if (c==0) |
| return(RIGHT); |
| return(THRU); |
| } |
| if (i>=nlin) return(0); |
| kl = c>0 ? thish (i,c-1) : 0; |
| if (kl<=1 && i>0 && allh(up1(i))) |
| kl = c>0 ? thish(up1(i),c-1) : 0; |
| kr = thish(i,c); |
| if (kr<=1 && i>0 && allh(up1(i))) |
| kr = c>0 ? thish(up1(i), c) : 0; |
| if (kl== '=' && kr == '=') return(THRU); |
| if (kl== '=') return(LEFT); |
| if (kr== '=') return(RIGHT); |
| return(0); |
| } |
| |
| int up1(int i) |
| { |
| i--; |
| while (instead[i] && i>0) i--; |
| return(i); |
| } |
