Original subtitles

One major thing that are lacking in our game is player health

Currently the player has no way to take damage in no way

Die

Salt we're going to get started

Implementing that

In this life

So

We already have

Health composed

And remember how I said we designed it in a way that we can read

Set the cross

Odyssey

So that's exactly what we're going to do so go ahead and open up your players

By clicking me open in editor button from the main scene

Let's go ahead and then stands in Uno

With control

Search for health

Composer

And that and then we'll move it

Above the above

Tell component how much health 312 player to have well this is going to be largely up to you and how you

But I guess I will just leave it

10 for now

And then we'll see you how

Hatfield

Ok so that's simple enough

The problem is we need to be a

How to change the health

When the player come

Collision

With an n

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And how are we going to do that

I'm gonna do is we're going to create another area 2D

In addition to the area to do that we have here

Dad is going to be able to detect enemies enter

The player

Animal use that as the base

Dl10

Switch to the player

So let's go ahead and rename this existing area too

To pick up area

To Dean

So that it better describes what this is

Purposes animal create another node on

Can you search of type area2d

And we'll go ahead and move it just under the pick-up area

What's this collision area

2D

And I'm going to go ahead and add a child node

Colours and shapes

Utilita

Let's go down to the ship resource

And create a new

Circle shape

And it looks like we can turn this down to about

Which roughly

Matches the player size

And then select the collision area to DW on the keyboard for the move tool

And we're just going to move

To roughly be centred around

The player

I think that looks ok what I am going to do is I'm going to go back to the collision shape to the underneath

Change the radius to something like said

Remember it's not necessarily a bad thing

Going to have your collision area by a little bit smaller

And if you want to see this letter you can read the collision area 2D

Above the Sprite just so we can get an idea

How dad's look

Can I take it

Fine

Ok

So

What's going on open up the place Crewe

And we want to

Detect when an enemy enters a collision

So

What

Do we need

To do

We need to configure the collision layer in the collision mask of the

An area

To be able

You detect enemy

Stop

Scroll down

With collision area2d selected

And we were

To make this not exist on any layer

And we wanted to look for collisions with me

Me and looking at

So central going to be doing is let me open up of the basic anime scene Justice

I'm going to

Turn the TV mode

So what we can figure it out our collision area to the

To look for it

Player seen is we're looking at centrally for this collision shape

Of the

So the small one

The inside

And why is

Because the basic enemy

Actually this basic enemy exist on the enemy collision layer so this is the this so I'm going

His Highness

Hide the hurt

Components of this blue circle right here is the thing that we wanted to

So is actually incorrect that's not the enemy layer

That is

The

Enemy collision

So we want to look for enemy

Collision

Instead

So I'm gonna go back to my player

The collision area 2D

Change the mass

From

Two enemy collision

That's going to be looking for the smaller area the same collision shape that the enemy uses for

Collisions against the train

Ok

Now the thing about the basic enemy

And as listening to that end

Collision layer

Collisions is that this is actually

Type

Barry

Instead of

So this is a body to do

Another area to

And so we're going to have to use a slightly different signal in our area

Detection

In the playlist

Gutter collision area today let's go and open up the playlist

And what we want to do in the ready metal that's removed this past line

And Wilder in here let's go ahead and remove

The comments as well because we

So we're going to

Collision area2d

A reference that with the dollar sign shortcut

Then we're going to say body and

So she had a different an area entered which we've been using

Previously

Because we're going to be listening for thing

That have expired

And we're going to connect

On Barry

And let's Create that function at the bar

On body enter

And by the way you'll notice that we are

Putting all of the signal functions at the bottom

That's just personally how I like

To organise the code

To put all the Single functions at the bottom and prefix

Was on

Underscore

So it's very clear that these are sick

And let's go hence like the Cleveland area to

In our

Seen here and we're going to go to the notepad to look at the singer

We can see the

We have Barry entered and body Exeter Sid

And the body that's coming in is a no too deep so let's go ahead and say

Other body

And that subtype notary

Corn at the end and then pass

Before we go any further how do we want to play that actually take damage with the thing that I'm in Vision

Is that

The player will take damage

While

There is an enemy colliding with

So what needs to happen

We need to listen for a body and turn signal

We need to

Doodle

Periodically while a body is inside of the play

Right so we don't want to damage every frame because I would be unfair the player died in

So I'm thinking every

A second or so

While there is an enemy

Colliding with the

We deal

So what we need to do to achieve that is we need to listen for body enter

But also body exit

And we need to make sure that it work

With multiple bodies so imagine the situation

For all collide with the player at the same time

We are going to want to listen for those but we don't want to multiply the damage the player is taken by 4

We just want to say all the players taking down

When those bars

Exit the player or when one body except the player we still want to keep doing damage because they're still three other body

On a plate does that makes

So I sent you all we need to do is we need to keep track of the number of bodies that are colliding with the player and as long as they

Number of bodies are greater than 0 we need a periodic Lindale Dam

And Simon show you how we can accomplish

So

As I mention we're going to need a listen for body exited as well

Time is going to duplicate this line

By copying pasting

And I'm going to change this to buddy x

And we are going to change this connector method to on

The Exeter

Create a new function to buy

On body X-ray

Again looking at our no return over here

That

Passes in a body argument as well so we'll just say other bar

Note

I'm alright pass

Set the top of a player script create a variable

I'm gonna call this number

Barry

Is equal to

Ok on body enter

We're going to get rid of this pass line

Do number colliding bodies + = 1

And then on body excellent working to do -

Colliding bodies

Equals

Now we need to

Deal damage to the player periodic

Let's create a timer on

The players and child node

Timer

Guide and drag that up above

Pick up area two

Call this damage interview

Timer

Let's go to the inspector

I'm going to change this wait time to

Return to One Show

Never Gonna Leave artist

Off

So what we need to do when the body is entering

Is we need to

Deal damage

So what I'm going to do is I'm going to write a new function called

Check

Deal damage

Something like

And what I'm going to do in here I'm going to say if number

Colliding bodies is equal to 0

Where is gonna return so we're not going to do anything if there's currently no colliding body

Otherwise what we're gonna do

Is we are going to

Deal damage to the player

So what we're going to do is reference the health component

And then we're going to do dot damage

We don't have this type so we're not going to get any

But if you need to see what the health components methods are even is open

Add script and you can see that we have a damage

Function right here was damaging

So I'm just going to go back to the play script and I'm just going to deal 1 damage

Then what's going to happen is I'm going to reference the damage interval time

With dollar sign damage in triple time

And

I'm going to start

So there's a couple of things so basically we want this to deal damage

When the number of Llandudno

0

We also want it to only deal damage if the damaged interval timer is stop

So let's get a reference for this damage in trouble timer so we don't have to

Using the star sign notation

I'm gonna go to the top of my script

I'm going to write on red

Via

Damage underscore interval

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Underscore timer is equal to

Damage internal time

And again

This means that

When were sewing missing in a variable we don't have to go to the same tree

To get that node every time

Just a little bit more can

Mirena replaced

Dollar sign damaged interval timer with Arnie

Variable and then in the top here if number of colliding bodies is equal to 0

Or

So that's 2 pipes for the or

Damage

Interval timer

Is stop and we actually want to

What's this tune

Stop which basically means

If our number of claim bodies is 0 or H damage interval timer is running them

Because we don't want to deal damage while the timer is still running that's basically just a graze

Which the player count

Sauna on body enter what we want to do is we want to call

Deals

Now the problem here

Is that we're only calling this now

When

An enemy enter

The play area

But what happens if that enemy is on top of the player

4 more than half a second

There's nothing that tells this to be called again

And so what we're going to do is we actually going to call this function

When the damage interval timer

Times out

Let's go back up to are ready

Function

And we're going to say dammit

Interval timer

Time out

Dartconnect

Water coolers on damage interval

Timer

Time out

Your notice

That's rather cause I'm being very verbal

In my function name

And why is that because it's just

Easier to read

More descriptive variable names and

Functioning

So how include you do the same

You can go to any piece of old code

As your building out your game

As long as you using descriptive variable names and function name

You're going to have an easy time wrapping your head around

What the code is doing

If you haven't seen it for a while

So I'm going to create that function at the bottom

On

What was it called on damage introvert

Timer time

And what are we going to do

In this function

We're going to rain

Check deal damage

Now you could just put cheque deal damage

Here

As the signal connection

But again I don't like to do that I like to have a

Function explicitly handles the signal

Omission

It just seems to make more sense

To me

So when the timer runs out you're going

Calling check deal damage again

So that means that as long as there is an enemy

The player

Check deal damage is going to keep being cold

Every have a

Tell me some cities in

So let's say that

The damage interval timer is at .4 seconds and is running but the enemy exit

When is timer countdown

What's going to happen

It's going to see that all there's no more colliding bodies so we just

So we've got the appropriate safety is in place so when I go

We doing erroneous data

To the

Alright and then the last thing to do

Is 2 let's just print for debug purposes the player

So print

Dollar sign health component

And let's go back to the health components

I've got current

So we can reference that

By simply just doing current

Underscore

Toilet seat for work so I'm Gonna Run the game

I'm just going to shrink the window so I can see my output console at the bar

We see 987

X5

So yeah that is counting down appropriate

Hello that are player even gets freed from the scene

When

Selfridges

And you can see that the fruit of our defensive programming have worked because

Despite the fact that there's no player in the scene anymore because he got q-free

Are Games still running in housing crash and we have no errors in the console why because we were taking care

To make sure that we are checking the validity of the player that we were referencing

And so the enemies they don't have a target to move through so they just

The camera is just

The timer is still going

So that's all that's very good demonstration of the benefits of

Defensive Pro

Alright so we've got basic hair

Damage logic in

For the player

And the next step is to make it visible on screen