Original subtitles

We've got viles in place and we've got

Experience being counted based on the files that you've picked up

Missing is the ability of the enemies to drop The Voice

And so we're going to do that and we're going to do that in a manner

That allows us to

Easily added functionality to future and

That we might add to our game

And so what we're going to be doing this for going to you

A technique known as

Composition

Composition is essentially what we've been doing with the native good all

We take us

Of a bunch of different types of nose

So for instance if I go to my place

We have a bunch of different types of notes

And all of these notes

I have distinct functionality

What together

They composed

The player

And so we're going to be doing something similar

With our own notes and what we're going to do

Is were going

Create a

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Vial drop composed

And the vile drug component will be able to listen for

When the anime dies

And then spawn a Vial at

If a certain

Threshold is met

But before we do that we want to implement

Health component first

Set the volume drop comp

You can listen for

So let's go out and create a health component and that will allow us to create

The concept of health as well

So let's create a new note control

Click on other node

Make this note a

Play Oldham

Let's call this health

Component

What's 8

Save it into seems and then let's create a new folder

Call the component

And let's see

The health component in there

Search go ahead in Addiscombe

And the default settings are

I'm going to add an export variable at the top

At export

Bar

Max underscore health

And we can just said it we can initialise it to something like

So now you can see that our health component has a Max health property

That we can add it through the inspect

Ok so what kind of functionality does a health component

Really clear out of these functions and we're going to write a new function

Funk

Damage

And then we're going to take a damage parameter which is going to be a Flo

And we need to subtract

The current health

Based on the damage that's coming

So let's just right past

An up blow

The max health export variable

Let's do another variable called current

Can we actually do need that ready method so let's go ahead and and that ready

The back in

So far

Underscore Reading

Really just say current health is equal to Max health

Henry

Perfect

So when we damage

The Entity

We need to

Current health

And subtract with Myers

The damage

Now

We actually don't want to help to be negative

A more appropriate way to do this

Might be something like

Current

Equal

Max

Current health

-10

And 0

So Max takes the maximum

Value of the two supplies

And this case if we ever end up with a negative

When we take

The damage being passed in away from the current

The maximum value becomes zero

This is essentially in forcing that we never dropped below 0 for a curry

Then we can do as we can

F

Current health

Is equal to Z

Then what we need to

We need to die

However

We don't really have anything

Hear that control

The death so what we're going to do is we're going to create a custom signal above the export variable

So signal

Dad

And then when our current health equals

What we can do as we can do

Died

Just like some so again this is just going to notify anything at listening that we've died

And you talking to

We're going to use

Start q

So what is this

It's a little bit

Tricky to explain

Owner is the note

That constitutes the route

Are the scene that this notice

So

In this scene in my help component seen my owner is Noor

My owner is no

Why because there's health component is the root of it scene

So it doesn't have an owner there's nothing at all

If I were to add what's a Sprite 2D as a child

This spray

2DS owner

Is the help

Right

Let's take a look at it

My player

Buy players area2d

Has an owner that is equal to

The player

Does not have an hour

So when we go to a basic enemy so I'm going to control shift go and open up the basic anyway

When I instantiated

The health component which you should do this as well so go ahead and stay and she a health camp

Space Academy

With ctrl shift a

Lights on

This health component now has an owner

What is basically

So we'll look at that script

What is doing moana Q3

Ordered IQ free

Breeze

The scene

But this helps

Belong

That will probably move this at some point

Out of this

Will it make sense for an hour to put this functionality in the

Component

So let's go to a basic anime Script so open up the basic anime scene and click on the Script icon

So we have this on area enter

Instead of calling q-free we actually went to apply damage to the

So let's go up blower max speed and Let's Get It On red

Reference

To the health care

So I'm ready for health compare

Is equal to dollar sign

And what we can do if we can go to your health component script again

And underneath the note we can write

Class underscore name

Health

Combine

And this will allow us to cast

Things to the health

Component

Type which will give us the Intelligence we need

Order code suggestions we

2 for example use damage ankle

To the Dead Sea

Go back to my basic enemies

And I'm going to type this health component as a type of

Health compare

Perfect and so now in the area entered I'm just going to do something very

Health

Start

Damage

And let's just go ahead and put 100 in

Remove the Q3 from the basic anime and using the health component

No obviously we're not getting any damage

From

The other

Area

And that's fine

We won't work on abilities transferring damage in

Future

Ok so we should basically see no functional chair

When we're on the

So what's going on

Ok so the sword appears and Still Kill

The rat

Ok so that's looking great

Warning me about the local function parameter

Damage shadowing and

The problem is that I have

A function called damage and the parameter is called damage as well

And that can be a problem because if I were a cold damage again in this function

It might be ambiguous as to what I'm afraid

So I'm going to do instead as I'm going to rename this damage

Parameter to damage amount so if you highlight this damage

And then press control d

That will highlight the second instance of damage that

Using here that I was going to write damage underscore

And that should be just

Ok so we've got the health component can figure

And obviously we can go to our enemy here and we can change the amount of health

That the enemy has just threw the editor here

Incel

Windows health component build

We can now add this health component to any entity we want to have

And it becomes a nice reusable

Piece of coal

This is composite

We're going to use this whole component

All over the place

Broad kinds of purpose

And we don't need to keep writing the same code over now

So what the hell come on built let's ride a vile drop components

Let's head control m

Same deal make this a

Basic notes

Cotton voile

Drop

Compound

So let's go ahead and save

And I just can't Vale drop and it will put it right next to the

Let's go ahead and Addiscombe

What we're going to do this time

Is we're going to

We're going to turn off the 10

So we don't want to have the ready method and process method to find first anymore

We have a good grasp of scripting sword just going to cry

Andover going to get is the extend no

Witches

Perfectly

The veiled wrap component what do we need well we need a reference to the vile seem so

Go ahead and right at export

Via

Underscores theme

That's going to be of time

Vaccine

Let's override the ready function

And what are we going to do in this

Function

Well we actually need a reference

To the health camp

As well

Solicitors Right pass in our ready method here

Just read it doesn't error

What's create another export variable

I'm going to create

Health composed

No

Just like so

So what that's going to do is that going to Louth

Supply

The health component path in the edge

And then I'm ready what we can do

Is we can say

Health component

Health

Component

Animal parenthesized

Where is a guide which is the Sydney

Dartconnect

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On

Dad

So it's that simple and then we're going to go

Endive

And what we want to do on death well we want to do a check

Vale seen is equal to null

Then we're just going to return out of there

Because We Can

Device is not defined

So what are we going to do we want to spawn the vile at the position of

Enemy

And

The veil drop component is going to be another note alongside the health component so we can use the owner again

To grab the

Now this is a little

Unsafe because we're not guaranteed

The owner is going to be a note today

So we could write a check we can say

Moana

Is not

No time to die

Then we can return

And I've got this order of the is not reverse the little bit not has to come first so if not owner

Is no to die

Then we're going to return which means that if we make it past that then our owner is entitled to

And so what I can do is I can save our

Spawn position

Is eagle

Moana

Parentheses first

Moana

As notary

Dart global

Perfect select response position

Then we're going to take

The vile seem so we're gonna

Instantiate that's all say vile

Incidence is equal to

Vial seen.in stands

Again we should

Instantiate as a node to use

We get the

Proper intelligence

Animal going to take the owner

Get pair

So we're going to

Princess adda

As a child

To the parent of the owner

Get parent and Child

Violin strings

And I'm going to say

While instance global position

Sequel to spawn

Position

Perfect solicitor are basically

And let instantiation

A child seen underneath

And we're going to instantiate the file drop company

And we're going to put it right next to the health component in the tree here

And now let's sign the health compare

In the health component property

But we're not going to assign the vile scene

We actually want to assign the vile scene within the veil drop component itself

So open up the volume drop compose

Search your filesystem

4

Experience vile

And go ahead and drag it over to the vile

So now we go back to our basic enemy

You can see when I hover over the vile

Component

That's vile scene

So now whenever we instantiate the valve

Component the only thing that will need to be said is the health component which will 0.2

The local

Self composed

Ok let's go back to our main

Delete all of these experiences while so holdship

And click

The first one in last one

Delete all of them by pressing delete

And then let's go ahead and Run the game

And so as these things die they should drop vials

Perfect

So there's one Vial

Now

We're getting a couple of hours here

Ok

So here is another quote

Adele

If you look at your errors you'll see can't change state while flushing

Queries

And this is because

We're trying to freeze something that is in the middle

Handling collisions

That's just a good ol' Cork

I'm not sure exactly why

What is the case but the way that we get around that area

Is we actually need to use

Call

Deferred

And what deferred calling does is it wait until the idle frame to call

Sophie got oral health component here

Are we going to do

Is we are going to create a new function

Card check underscore death in our health and

We're going to take this if current health is a good as your work I take that out and

Underneath that checked

Does the check that function body

And any here what we're gonna do we're gonna use

Callable

So capital city

This is 8

Callable

And then in parentheses were going to put in a reference to check DAF now your autocomplete is

I want to automatically call it

Why using parentheses we don't want that

So remove those parentheses

They should just be passing a reference to the function in the collarbone

And then we can do

Call deferred

So that's going to do that going to take this function

And then call it on the next I don't

And then

We're going to do the check that function at that point and then we can

Handle all the stuff for handling so it's going round the game again

That should no longer be

And we can see that vials were being spun

And I can go ahead and pick them up

So one final thing to do before we wrap up this lesson which I know is a little bit longer than the other

Is Rihanna add a drop percentage

Answer to the vile

Insole let's go ahead and go back to eval component script

As the first export variable

What's actually reorder some things let's move the pack scene

Blow everything so

Use alt and down on your keyboard to move that line down

And then the first export is going to be

Port Vale

Flower

No

Are we actually do instead of just a plain old export as we can do export underscore range

And then we can in parentheses

Define what the range

So we can say 0 as the men

And one of the max

So if we go to avail drop component over on the left

We can see a drop percent in it cannot exceed 1

And it cannot go below zero

So this is nice because it doesn't make sense to have a more than 100% or less than 0%

Strawberry

Perfect an elastic that we're going to do with the Val drop is we're just going to say

Initially to

What's a .5

So I'll have a 50% drop rate by The Fall

That will be configurable

And the reason that you might want to set a default variable in your exports is because if I go over 2

Just represent in I

Dragon

You can see that this little arrow appears

When it's not

When the values are equal to its default

And that's nice because now I can just click the arrow to reset it

To what I've got hardcore

Industry

So if you want to just provide some sensible defaults for anything that your export

That's all

Hindi to do

So now we need to take into account that drop

Percent

Right

So

What we can do it simply is we can just say if

Ran

Surround f Returns

Every you can control click into things by the way so I hold ctrl and click in taranto

That will take me right to the documentation for

And that

Says it return the floating-point value between 0 and 1

So

It's going to be very

To do what we need to do

We can just say if Randolph is a functions on Vulcan

Is less than or equal to

Drop percent

Actually it's not do that let's say if friend of is greater than 8%

Return

So basically

F r and F is not within the range of 0 to drop

Percent

Then we're just going to return outlet

Ok so now for you run the game in test that we should see that roughly half the enemies drop vials when they die

So that one drop

That one day

That one

That one

One of them

So it looks to be working

Ok so that was an introduction to components we've now got a health component and a vile drop component that we can use toucan

Play your game as we continue

Into the future