Basic Line of Sight

Wiz · #1 08-13-2003, 12:25 AM

This function will use the nodes in .map files to apply line of sight (prevents wall aggro if used right, among other things). It is not perfect yet, as it tends to fail on thin walls, or walls on top of other floors (such as in unrest or hole), but it's a start.

Code:

bool Mob::CheckLos(Mob* other) {
	if (zone->map == 0)
	{
		return true;
	}
	float tmp_x = GetX();
	float tmp_y = GetY();
	float trg_x = other->GetX();
	float trg_y = other->GetY();
	float perwalk_x = 0.2;
	float perwalk_y = 0.2;
	float dist_x = tmp_x - trg_x;
	if (dist_x &lt; 0)
		dist_x *= -1;
	float dist_y = tmp_y - trg_y;
	if (dist_y &lt; 0)
		dist_y *= -1;
	if (dist_x  &lt; dist_y)
		perwalk_x /= (dist_y/dist_x);
	else if (dist_y &lt; dist_x)
		perwalk_y /= (dist_x/dist_y);
	while (1) {
		if (tmp_x &lt; trg_x)
		{
			if (tmp_x + perwalk_x &lt; trg_x)
				tmp_x += perwalk_x;
			else
				tmp_x = trg_x;
		}
		if (tmp_y &lt; trg_y)
		{
			if (tmp_y + perwalk_y &lt; trg_y)
				tmp_y += perwalk_y;
			else
				tmp_y = trg_y;
		}
		if (tmp_x > trg_x)
		{
			if (tmp_x - perwalk_x > trg_x)
				tmp_x -= perwalk_x;
			else
				tmp_x = trg_x;
		}
		if (tmp_y > trg_y)
		{
			if (tmp_y - perwalk_y > trg_y)
				tmp_y -= perwalk_y;
			else
				tmp_y = trg_y;
		}
		if (tmp_y == trg_y &amp;&amp; tmp_x == trg_x)
		{
			return true;
		}
		PNODE pnode = zone->map->SeekNode( zone->map->GetRoot(), tmp_x, tmp_y );
		if (pnode != 0)
		{
			int *iface = zone->map->SeekFace( pnode, tmp_x, tmp_y );
			if (*iface == -1) {
				return false;
			}							
		}
	}
	return true;
}

Merth · #2 08-13-2003, 02:22 AM

Wow, this is very cool. I can't wait to see this in action.

x-scythe · #3 08-13-2003, 01:13 PM

nice, now i wont get jumped by 50 mobs at a time in dungeons

good job

Merth · #4 08-14-2003, 11:18 AM

Is there a server available where I can see this is action? I can go both 0.4.x and 0.5.0.

Wiz · #5 08-15-2003, 02:33 AM

Well, Winter's Roar, I'd be happy to demonstrate it when the logins come back up.

cokerms · #6 01-05-2004, 07:10 AM

Did this code ever get added? I was looking through the code base and didn't see that particular function, but I didn't know if it was added elsewhere. I still get jumped by mobs through walls in najena so I am guessing it didn't.

You guys are still doing a great job. Thanks

Eglin · #7 02-06-2004, 08:37 AM

Quote:

Originally Posted by cokerms

Did this code ever get added?

http://cvs.sourceforge.net/viewcvs.p...in&rev=1.1.1.8