shithub: asif

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path: fix corner coasting check

--- a/path/grid.c

+++ b/path/grid.c

@@ -128,13 +128,20 @@

 	for(i=0, vl=neigh, open=0; i<nelem(dir); i++){

 		p´ = ∑V(p, dir[i]);

 		if(!V∩V²(p´, r)){

-			open |= dmask[i];

+			if(i < 4)

+				open |= dmask[i];

+			dprint(Logtrace, "%N→%V out of bounds\n", u, p´);

 			continue;

 		}

 		v = grid + p´.y * gridwidth + p´.x;

+		if(isblocked(v)){

+			if(i < 4)

+				open |= dmask[i];

+			continue;

 		/* forbid corner cutting */

-		if(isblocked(v) || (open & dmask[i]) != 0){

-			open |= dmask[i];

+		}else if((open & dmask[i]) != 0){

+			dprint(Logtrace, "%N→%N move disallowed, dir %#02ux blk %#02ux\n",

+				u, v, dmask[i], open);

 			continue;

 		}

 		*vl++ = v;