How to use AGS Part 28 (More About Walkable Areas and Objects) Video Lecture | Learn and Master: Adventure Game Studio (AGS) - Game Development

okay we're back I wanted to address a
couple of things in this video if you
would know if you were keen in the last
video and somebody actually was and they
posted a comment in the last video which
I was gonna address in this one first of
all I'm gonna run the game from the last
video and if you notice when I walk up
to the door here to the closet door
there's a slight walk-behind problem you
see how the door overlaps Sammy they're
obviously not what we want so I'm gonna
show you how to fix that first of all
now the interesting thing about this is
this is not your typical well this is
your typical walk beyond my problem but
this this won't be solve your typical
way with the walk behind issue that
we've solved in the past because this
door right here is a closed door object
so you can't set a walkable area a walk
behind area on an object so how do how
do we address that well that's what I'm
gonna talk about in this videos so among
other stuff but I first of all want to
show the rooms objects I'm going to
select this closed door which is the
door we're having a problem with and if
you notice there's one option here
called baseline overridden remember in
the when we were talking about the walk
behind there's something called a
baseline I'll show you that on the walk
behind this is the Left Behind area we
had remember this dotted line if you
remember this is the baseline in other
words anything which moves at any time
that Sammy is above this baseline then
the walk behind is drawn on top of Sammy
and whenever he's below the baseline
then Sammy is drawn on top of the walk
behind
well objects have similar a similar
property but by default that baseline is
is turned off so the baseline or I
shouldn't say is turned off it's it's um
it's set to the lowermost pixel of the
of the object in this case the baseline
would be this invisible line here sort
of where this this died line at the
bottom of the object is you know it
extend all the way across the screen
that's my default the baseline for the
object that doesn't work for us because
if Sammy is above that line then the
door will be drawn on top of Sammy but
yet we don't want that to happen we want
we don't want you know Sam to be drawn
on top of
we will send it basically always be
drawn on top of the the door so one
thing we could do and the first thing
that I thought of when I thought okay
well fix this is you said this to true
it gives you another property called
baseline by default that's set to one in
other words that's basically at the very
top of the screen I guess technically
maybe zero would be the top but the
first pixel on the screen up here at the
very top of the screen would be the
baseline meaning basically everything is
drawn on top of this door that doesn't
exactly work a lot of times that would
work but in this case it doesn't because
there are objects behind the door for
example this Lantern here and mr.
Donatello even will be on the door in
the room let me show you what that looks
like about if I do that yeah it looks
kind of strange but now mr. della
televisione the closet and the lantern
is in the closet but both of them now
are drawn on top of the door because
both of the them are below the doors new
baseline which is which is at the very
top of the screen that's not so what we
really want we want to set the baseline
about you know right here where the the
corner the back corner of the door meets
the floor here if you look at my mouse
coordinates you see that that's about
105 so I'm gonna set the baseline to
about 105 so therefore that should fix
everything and let's see how that works
the lantern disappeared in the editor so
the editor knows is smart enough to know
okay and now say me is drawn exactly
where he should be now I actually had
gone through and set Donatello starting
position to 103 I think it was 105
before which is what I had set at the
very beginning when we created Donatello
that doesn't work exactly either because
now Donatello is below the base line as
well and he at 105 where he was he's
actually drawn on top of the door so
before the video started I just went in
here and I set this to 103 which is just
one pixel above actually I guess I could
say it to 104 which is one pixel above
that where we set the baseline of the
door which is 105 so again run that and
then everything works fine
when I when the door disappears of
course when I use the key on the door
all that goes away the object basically
is invisible at that point so so that
goes away now one thing that I do know
addressed to is now now that the door is
open we want to Sammy Sammy should be
able to walk inside the closet because
the door is open but he can't the reason
is because when I created this door I
took away the walkable area when we
course created the the room we had set a
walkable area so sammy actually could
walk in there but when i put closed it
closed the closet door basically now he
couldn't walk in there so i deleted this
well we want to put that back but we
don't want what we don't want to do is
this we don't want to say okay let's put
that back
put the walkable area up like about like
I had before fill that in and run the
game because now look what happens and I
think most of you can guess I go up here
the doors closed
but sandy is able to walk in the closet
not what we want we want we only want
Sam to walk in the closet when the doors
open so in other words we only want this
part of the walkable area to be turned
on when the door is opened well how in
the world do we do that well that's one
of the reasons why Chris Jones and all
his wisdom gave us multiple walkable
areas I think we've actually used the
first three I guess one two and three so
I'm gonna select local area for query ID
four which is one we haven't used yet
I'm gonna draw out this this area right
here that goes into the closet as a new
walkable area and I'm not being very
precise here but you get the idea
we're just gonna fill this in and very
quickly okay so now this is a new
walkable area but again it's not turned
off so if I run the room right now which
I won't but if I run the game he'll
behave the exact same way because even
though this is a different
ah Claire it still is a walkable area so
this is something we need to do in our
room script we need to turn this
walkable area off if you go into the
room script basically we want to turn it
on or off at the beginning of when you
know then the beginning of the room
whenever Sammy first enters the room is
when we want to do whatever we're gonna
do with the walkway area so there's a
room load here which is where we set up
our timer a long time ago I'm gonna take
that and I'm gonna add a new feature
that says if because remember Sammy can
walk into the room at any point in the
game so the door might be open or might
be closed we can't just assume that the
doors closed I've never seen any coming
in here so we have to say if and
remember that variable that I that I set
up in the last video is Donatello in
closet well let's use that again so if
Donatello is in the closet in other
words the closet door is closed then we
want to turn off that walkable area so
the function to do that is called remove
walkable area and it takes one parameter
instant integer which is the area number
I'll remember remember that was walkable
area ID for that we just created that
red one that went into the closet so
remove that walkable area now I can say
else
so if Donatello is not in the closet
then we'll just go ahead and say restore
walkable area actually we don't need to
do that actually I'm not gonna do it
because by default it's turned on so
there's no reason to restore it here so
it does tell it was in the closet remove
the walkable area now there's one more
thing that we need to do and whatever we
let him out of the closet which is here
whenever we let him out we want to turn
on that walkable area so that's called
restore walkable area five so that's
really what we need to do let's see how
that works I hope that made sense you
remove the walkable area and you restore
it again so right now I shouldn't be
able to walk in there because Donatello
is in the closet I'm going to use the
key on the door to let him out now even
though he's technically still in there
our flag that says is done at element
closet that's now false so that should
have turned on the walkway and it didn't
Oh No
what are we gonna do let's see why it
didn't actually I don't know why I did
oh because I put the wrong number in
here okay I could cut that out but I'm
not going to um so just one example of
debugging here which I'll get help make
another video about debugging later but
um I put the number 5 in here I should
have put the number 4 so let's run it
again and see use the key come on key
there you go ok now I should be able to
walk in there and I can so that's how
that works I just wanted to be a little
clearer on that how the restore walkable
area removed walkable area works and
also about objects and their baselines
this video sort of was a clean up video
and there's a couple things in here that
I didn't I didn't intend to go over but
just happened to do that so I'm gonna
make another video and I'll upload it
really very quickly after this video
that will adjust regions somebody else
in the comments suggested or asked me I
think it was a comment they might've
sent me an email asked me how to do the
map screen if you remember in Sammy's
quest there's a map screen where Sammy
could go to lots of different places on
sort of an overhead map view that
doesn't really work very well with with
room edges which is what this person was
was confused about you know how do you
address that if you don't really want to
use room edges well that's what I'm
gonna get into the next video about
regions and we'll get into a couple of
things that we can do with with regions
so um until then guys I hope you're
enjoying this and thanks for watching my
videos bye