Function checkRangeOfWall

source/core/gamefuncs.cpp:841–868

//==========================================================================

bool checkRangeOfWall(walltype* wal, EWallFlags flagmask, const DVector3& pos, double maxdist, double* theZs)
{
	if (!wal->twoSided()) return false;
	if (wal->cstat & flagmask) return false;
	if (PointOnLineSide(pos.XY(), wal) > 0) return false;

	auto nextsect = wal->nextSector();

	// Rather pointless sky check that needs to be kept...
	if (((nextsect->ceilingstat & CSTAT_SECTOR_SKY) == 0) && (pos.Z <= nextsect->ceilingz + 3)) return false;
	if (((nextsect->floorstat & CSTAT_SECTOR_SKY) == 0) && (pos.Z >= nextsect->floorz - 3)) return false;

	auto pos1 = wal->pos;
	auto pos2 = wal->point2Wall()->pos;

	// Checks borrowed from GZDoom.
	DVector2 boxtl = pos.XY() - DVector2(maxdist, maxdist);
	DVector2 boxbr = pos.XY() + DVector2(maxdist, maxdist);
	if (!BoxInRange(boxtl, boxbr, pos1, pos2)) return false;
	if (BoxOnLineSide(boxtl, boxbr, pos1, pos2 - pos1) != -1) return false;

	auto closest = pos.XY();
	if (enginecompatibility_mode == ENGINECOMPATIBILITY_NONE)	// todo: need to check if it makes sense to have this always on.
		SquareDistToSector(closest.X, closest.Y, nextsect, &closest);

	calcSlope(nextsect, closest.X, closest.Y, &theZs[0], &theZs[1]);
	return true;
}

//==========================================================================
//