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hello everyone

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this is part two on how to make a tower

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defense game in scratch

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in this tutorial i will be setting up

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the enemy lists which will be used for

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tower aiming and shooting

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and i will also begin making our first

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tower that we will be able to place on

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the map

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if you haven't seen part one check it

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out link is in the description below

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and before we start we will be doing

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some code which involves lists

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but i won't be going into too much

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detail about them right now

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because they'll be used in the next

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video anyways

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let's get started so first off before we

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start creating the turrets

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we have to first add some lists to the

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enemies so let's go to variables

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and then i'm going to make a list

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and i'll call the first one um enemyx

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all right and then keep it for all

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sprites

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and i'll create another list and then i

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will call this enemy y

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okay and then i'll create another list

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and call it enemy progress

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and i'll create one more and call this

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enemy ids okay

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so the reason i'm creating these lists

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is because i need a way to track

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all of the enemies on the screen and

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this is so that the towers that i will

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create

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will know which enemy to target so of

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course the enemy x and enemy y lists

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will track the enemy x and y positions

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and then the enemy progress list will

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track the distance each clone has

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traveled on the track

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and the enemy id list will just have all

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of the clone numbers

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so i'm going to hide all of these lists

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okay and then under the windfly clicked

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i am going to drag a delete all and

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change this to delete all

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of enemy x and then also delete all of

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enemy y

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delete all of enemy progress and delete

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all of enemy ids

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and then i'm going to put this right

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after the hide

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okay so this just makes sure that all of

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the lists are empty when the game starts

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so now let's create a new variable and

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then i will call this um

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something like clone number okay

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and then for this one make sure to

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select for the sprite only

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and this is because each clone will have

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a separate value for this clone number

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so select for the sprite only and then

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click ok

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all right and this clone number variable

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will track

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which clone is which inside of all of

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these lists

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so when the flag is clicked let's set

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clone number to zero

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and then inside of this repeat loop

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let's change clone number by one

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and then i'm going to put this right

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before the create clone myself

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and now each clone that is created

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should have a different value for this

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clone number variable

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from 1 to 10. so now when a clone is

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created

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i'm going to add a item to the four list

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that we created

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so inside of the lists let's drag a

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add and then i'm going to change this to

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add

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um nothing to enemy x

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and this just adds an empty new item

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into the enemy x list

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and then i'm going to duplicate this

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and then also add an empty item to the

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enemy y list

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and then for the enemy progress i am

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going to add

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0 for that and lastly for the enemy ids

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i am going to add the clone number

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alright so each enemy that is created

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will have their own enemy x

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enemy y and enemy progress which they

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will change

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as well as their own enemy id alright

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so i'm going to drag this under the

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winnestar as a clone

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and now each enemy will update these

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three lists

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and by the way this might seem a bit

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confusing but it'll make more sense once

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i create the turrets

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which will use these lists so inside of

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the enemy movement block

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i'm going to grab a replace item 1 of

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block

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okay and then i'm going to drag this

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under the enemy movement custom block

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and then for this i'm going to replace

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the clone number

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so replace item clone number of enemy

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x with go to motion

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the enemy x position okay

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so and then i'm going to right click

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duplicate this block

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and instead of enemy x i'm going to

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change this to enemy y

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and of course i am going to replace that

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with the y position

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and then lastly for the enemy progress i

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am going to duplicate this again

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and change this to enemy progress and

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then for this

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sense this is going to show how far the

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enemy has moved

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i am going to actually go to variables

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and then go to the lists

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and then i am going to grab a item one

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of enemy id's block and then i'm going

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to change this to enemy progress

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and inside of this right here i'm going

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to drag

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a clone number variable and then i'm

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going to go to operators drag a plus

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operator

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all right and then drag this on the left

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side

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and then i'm going to add the move speed

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on the right side alright so pretty much

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what this does is that when the enemy

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moves five steps

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then the enemy progress will increase by

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five

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okay so now i am going to put this

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inside of here

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and then i'm going to drag this back

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all right so lastly we have to add a few

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more things

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for when the enemy leaves the screen so

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inside of the if touching edge

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i am going to go to the lists again

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and then drag a replace item of block

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and then in here drag a clone number

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variable

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and change this to enemy x

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and then inside of the value i think i'm

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going to do

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a blank okay and then

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i am going to duplicate this change this

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to enemy y

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and also leave it blank and then lastly

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i am going to go to the lists again

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and this time actually um grab a delete

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one of block and then i am going to grab

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a

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item number of block and then put the

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clone number variable in here

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and then this is going to be for the

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enemy ids list so we can leave it like

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that

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and i will drag this back inside of the

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value

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all right so i know i'm sort of speeding

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along with this but pretty much

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now we know all of the clones x and y

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positions

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as well as their progress and their

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clone numbers

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so i'm going to put this inside of the

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if touching edge

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and then instead of hiding i'm going to

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actually

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delete the clone all right

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and now i believe that should be fine

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for the enemies

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so if i just show all of these lists for

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now

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then when the enemies appear then they

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should

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add their values to these four lists as

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you can see

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and then once they disappear then this

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enemy ids list

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should decrease in size

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like this and then the values should

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turn blank

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alright cool so of course there are no

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changes to the game

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other than these four lists but now we

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can start creating the towers

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so i'm going to hide these

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and then i'm going to create a new

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sprite

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and for now i will make a simple tower

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so i will make this a gray color

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okay

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and i think a black outline should be

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fine

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maybe a dark gray all right

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and then for the tower i think i'll make

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a simple

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square maybe a lighter gray

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with a larger outline all right

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might make it a bit smaller

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okay

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and i'll make the outline a bit smaller

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as well

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okay and then i am going to create one

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more rectangle

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this is going to be how the turret

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shoots

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all right and i think

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this should be fine

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okay so this is my simple turret and

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make sure that this square right here is

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centered in the middle

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and not this entire thing because

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otherwise the turret won't rotate

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correctly

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so only center this square in the middle

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okay so now let's go inside of the code

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and i'm going to drag a wind flag

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clicked

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and then i'm going to go into looks drag

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a set

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size to a hundred percent drag a switch

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costume to costume one

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and oh yeah actually i'm going to create

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a really simple shop

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where you can buy and place turrets so

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actually i am going to

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set the size to something like 25

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okay that's a bit too small so maybe 50

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percent

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60 65

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okay so 65 and then

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i'm gonna put this turret right over

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here somewhere

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so on the top right corner all right

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and then i'm going to drag this go to xy

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block

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and pretty much what i'm planning to do

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is that i'm gonna make it so

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if i click this image right here then it

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will create a clone of the turret for me

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to place on the map

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so to do that i am going to go to

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variables and then create two new

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variables

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the first one is going to be called um

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let's call it mouse action

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all right and then click ok and then for

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the second one

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i'm going to create let's call this can

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show radius circle

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and then click ok alright so i want to

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make it so that if i click this right

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here

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then it will create a clone of a turret

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which will follow my mouse pointer

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until i click again and then the turret

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stays in place

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so to do that we are going to use the

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mouse action variable

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so i'm going to first set mouse action

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to none when the flag is clicked

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and then i'm going to go to control drag

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a forever loop

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and then forever i'm going to check if

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go to sensing if the turret is touching

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the mouse pointer

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and the mouse is down

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00:11:00,399 --> 00:11:07,200
so sensing again mouse down

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00:11:04,079 --> 00:11:10,480
then i'm going to go to variables

290
00:11:07,200 --> 00:11:14,320
and then set mouse action to

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00:11:10,480 --> 00:11:16,720
something like let's say selected

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00:11:14,320 --> 00:11:18,800
okay so this is going to be the first

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00:11:16,720 --> 00:11:19,360
click which means that this sprite right

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00:11:18,800 --> 00:11:21,920
here

295
00:11:19,360 --> 00:11:22,880
creates a clone of a new turret and then

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00:11:21,920 --> 00:11:25,440
the turret clone

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00:11:22,880 --> 00:11:27,680
should follow our mouse pointer so let's

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00:11:25,440 --> 00:11:32,079
go to control

299
00:11:27,680 --> 00:11:32,079
and then let's drag a 1xr as a clone

300
00:11:32,480 --> 00:11:37,120
and then inside of it i'm going to drag

301
00:11:34,959 --> 00:11:39,279
a forever loop

302
00:11:37,120 --> 00:11:40,880
and i'm going to drag an if else

303
00:11:39,279 --> 00:11:45,120
statement

304
00:11:40,880 --> 00:11:50,000
and check if go to variables

305
00:11:45,120 --> 00:11:51,760
if the mouse action is equal to selected

306
00:11:50,000 --> 00:11:53,600
which means that the clone should follow

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00:11:51,760 --> 00:11:55,519
the mouse pointer

308
00:11:53,600 --> 00:11:58,560
then of course we are going to go to

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00:11:55,519 --> 00:12:01,760
motion and drag a go to

310
00:11:58,560 --> 00:12:05,200
and change it to mouse pointer alright

311
00:12:01,760 --> 00:12:08,560
and also make sure to create a clone

312
00:12:05,200 --> 00:12:09,600
of myself once the original sprite is

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00:12:08,560 --> 00:12:12,160
clicked

314
00:12:09,600 --> 00:12:13,120
and i'm also going to add a wait until

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00:12:12,160 --> 00:12:15,600
block

316
00:12:13,120 --> 00:12:18,399
so wait until and then i'm going to

317
00:12:15,600 --> 00:12:22,160
right click duplicate this

318
00:12:18,399 --> 00:12:24,800
and put it in here and i'm going to say

319
00:12:22,160 --> 00:12:26,320
wait until touching mouse pointer and

320
00:12:24,800 --> 00:12:29,120
not mouse down

321
00:12:26,320 --> 00:12:29,920
so i'm going to go to operators drag a

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00:12:29,120 --> 00:12:32,240
knot

323
00:12:29,920 --> 00:12:33,680
and put the mouse down on there and put

324
00:12:32,240 --> 00:12:35,839
it back

325
00:12:33,680 --> 00:12:36,880
all right cool and now i'm going to put

326
00:12:35,839 --> 00:12:40,959
this

327
00:12:36,880 --> 00:12:43,360
right before the create clone of myself

328
00:12:40,959 --> 00:12:45,360
alright so now if we try it then we

329
00:12:43,360 --> 00:12:45,760
should have a clone which appears under

330
00:12:45,360 --> 00:12:48,399
it

331
00:12:45,760 --> 00:12:49,440
once we click the sprite right here

332
00:12:48,399 --> 00:12:51,360
alright cool

333
00:12:49,440 --> 00:12:53,600
so now of course we want to place the

334
00:12:51,360 --> 00:12:56,399
turret once we click again

335
00:12:53,600 --> 00:12:59,519
so i'm going to go to control and then

336
00:12:56,399 --> 00:13:02,079
drag another when i start as a clone

337
00:12:59,519 --> 00:13:03,360
and in this one i'm going to check

338
00:13:02,079 --> 00:13:06,880
forever

339
00:13:03,360 --> 00:13:10,320
if mouse down so sensing

340
00:13:06,880 --> 00:13:11,440
if mouse down then i'm going to wait

341
00:13:10,320 --> 00:13:15,120
until

342
00:13:11,440 --> 00:13:18,240
not mouse down so this ensures that

343
00:13:15,120 --> 00:13:20,160
the player does one full click so wait

344
00:13:18,240 --> 00:13:23,360
until not mouse down

345
00:13:20,160 --> 00:13:26,639
then i'm going to go to variables

346
00:13:23,360 --> 00:13:30,079
and set the mouse action

347
00:13:26,639 --> 00:13:32,399
to none okay

348
00:13:30,079 --> 00:13:33,600
and for the clone i am also going to set

349
00:13:32,399 --> 00:13:37,920
the size

350
00:13:33,600 --> 00:13:41,360
to its normal size which was 100 percent

351
00:13:37,920 --> 00:13:44,240
okay so now if you try it then

352
00:13:41,360 --> 00:13:45,839
if i click then we have a clone and then

353
00:13:44,240 --> 00:13:49,440
once i click again

354
00:13:45,839 --> 00:13:51,839
then it stays on the track alright cool

355
00:13:49,440 --> 00:13:53,040
so of course we all know that towers in

356
00:13:51,839 --> 00:13:55,680
tower defense games

357
00:13:53,040 --> 00:13:57,199
have ranges so now i'm going to create a

358
00:13:55,680 --> 00:13:58,639
new sprite

359
00:13:57,199 --> 00:14:00,880
and this is going to be the range for

360
00:13:58,639 --> 00:14:03,839
this tower

361
00:14:00,880 --> 00:14:04,720
and for the range i am going to create a

362
00:14:03,839 --> 00:14:08,720
simple

363
00:14:04,720 --> 00:14:12,639
circle so i will press shift

364
00:14:08,720 --> 00:14:16,160
and then hold for a perfect circle

365
00:14:12,639 --> 00:14:18,399
all right and i will make the fill a

366
00:14:16,160 --> 00:14:21,440
white color

367
00:14:18,399 --> 00:14:24,639
and i think the outline for this is fine

368
00:14:21,440 --> 00:14:24,639
maybe a bit smaller

369
00:14:25,120 --> 00:14:28,800
um okay i think an outline of four is

370
00:14:27,920 --> 00:14:31,600
okay

371
00:14:28,800 --> 00:14:34,160
and now inside of the code i'm going to

372
00:14:31,600 --> 00:14:36,000
drag a when fly clicked

373
00:14:34,160 --> 00:14:37,279
and then i'm going to first hide the

374
00:14:36,000 --> 00:14:41,440
range sprite

375
00:14:37,279 --> 00:14:42,560
so drag and hide and i think i'm also

376
00:14:41,440 --> 00:14:44,560
going to make it

377
00:14:42,560 --> 00:14:45,600
sort of transparent or sort of

378
00:14:44,560 --> 00:14:48,480
see-through

379
00:14:45,600 --> 00:14:49,120
so i'm going to change this to set ghost

380
00:14:48,480 --> 00:14:52,320
effect

381
00:14:49,120 --> 00:14:55,600
to 50 so let's try it out

382
00:14:52,320 --> 00:14:58,320
oops okay it's hidden so show

383
00:14:55,600 --> 00:14:59,519
all right i think that looks pretty good

384
00:14:58,320 --> 00:15:02,480
and now

385
00:14:59,519 --> 00:15:04,480
i'm going to create one more variable so

386
00:15:02,480 --> 00:15:07,600
let's call this um

387
00:15:04,480 --> 00:15:10,160
something like view radius

388
00:15:07,600 --> 00:15:11,600
so this is going to determine how large

389
00:15:10,160 --> 00:15:13,680
this circle will be

390
00:15:11,600 --> 00:15:15,920
and now we should be good so let's go

391
00:15:13,680 --> 00:15:18,079
back to our turrets right

392
00:15:15,920 --> 00:15:19,519
and by the way i'm going to name this

393
00:15:18,079 --> 00:15:23,279
turret

394
00:15:19,519 --> 00:15:26,720
okay and also i'm going to name this uh

395
00:15:23,279 --> 00:15:30,720
radius circle i guess

396
00:15:26,720 --> 00:15:33,839
or turret range circle

397
00:15:30,720 --> 00:15:34,639
all right and inside of the turret

398
00:15:33,839 --> 00:15:37,839
sprite

399
00:15:34,639 --> 00:15:38,639
i am going to first set the can show

400
00:15:37,839 --> 00:15:41,839
radius circle

401
00:15:38,639 --> 00:15:44,560
variable to no

402
00:15:41,839 --> 00:15:46,480
all right and this means that the range

403
00:15:44,560 --> 00:15:48,800
circle will be hidden

404
00:15:46,480 --> 00:15:49,759
however once we are actually dragging

405
00:15:48,800 --> 00:15:52,800
the turret

406
00:15:49,759 --> 00:15:55,040
we want to show the range circle so

407
00:15:52,800 --> 00:15:56,480
inside of the if mouse action is equal

408
00:15:55,040 --> 00:15:59,040
to selected

409
00:15:56,480 --> 00:15:59,839
i'm going to set the can show ready

410
00:15:59,040 --> 00:16:02,880
circle

411
00:15:59,839 --> 00:16:05,440
to yes and then

412
00:16:02,880 --> 00:16:06,480
up over here once we actually place the

413
00:16:05,440 --> 00:16:08,880
tower

414
00:16:06,480 --> 00:16:11,120
then i'm going to hide it again so i'm

415
00:16:08,880 --> 00:16:14,480
going to drag the cancho radius circle

416
00:16:11,120 --> 00:16:17,199
to no all right cool so now inside of

417
00:16:14,480 --> 00:16:20,800
the turret range sprite

418
00:16:17,199 --> 00:16:22,000
we want to check forever and then i'm

419
00:16:20,800 --> 00:16:25,440
going to drag in if

420
00:16:22,000 --> 00:16:28,560
else so we want to check if

421
00:16:25,440 --> 00:16:30,399
the can show radius circle variable is

422
00:16:28,560 --> 00:16:32,720
equal to yes

423
00:16:30,399 --> 00:16:34,240
then of course we want to show the

424
00:16:32,720 --> 00:16:37,040
radius circle

425
00:16:34,240 --> 00:16:38,880
so drag a show and we also want to make

426
00:16:37,040 --> 00:16:42,079
it go to the mouse pointer

427
00:16:38,880 --> 00:16:44,880
so let's drag a go to

428
00:16:42,079 --> 00:16:45,920
and change this to mouse pointer all

429
00:16:44,880 --> 00:16:49,040
right cool

430
00:16:45,920 --> 00:16:51,120
and then inside of the else we want to

431
00:16:49,040 --> 00:16:53,920
hide

432
00:16:51,120 --> 00:16:54,320
and now if we try it out then if we

433
00:16:53,920 --> 00:16:57,199
click

434
00:16:54,320 --> 00:16:57,920
on the image then as you can see we have

435
00:16:57,199 --> 00:17:00,639
the turret

436
00:16:57,920 --> 00:17:02,079
along with the radius circle and if i

437
00:17:00,639 --> 00:17:04,799
place it down

438
00:17:02,079 --> 00:17:05,679
then the circle disappears all right

439
00:17:04,799 --> 00:17:07,600
cool

440
00:17:05,679 --> 00:17:09,199
and i think i'm going to make the turret

441
00:17:07,600 --> 00:17:11,760
a bit smaller

442
00:17:09,199 --> 00:17:13,120
so maybe set size to something like 75

443
00:17:11,760 --> 00:17:16,839
percent

444
00:17:13,120 --> 00:17:18,079
let's try it out and okay i think that's

445
00:17:16,839 --> 00:17:21,280
fine

446
00:17:18,079 --> 00:17:23,839
and now we have our radius

447
00:17:21,280 --> 00:17:25,120
all right cool alright so let's try it

448
00:17:23,839 --> 00:17:26,959
out again

449
00:17:25,120 --> 00:17:28,559
and let's see if we can place multiple

450
00:17:26,959 --> 00:17:34,160
turrets

451
00:17:28,559 --> 00:17:35,840
um okay so let's see um

452
00:17:34,160 --> 00:17:37,360
oh yeah one thing to change is that the

453
00:17:35,840 --> 00:17:40,000
mouse action variable

454
00:17:37,360 --> 00:17:41,039
should actually be for this sprite only

455
00:17:40,000 --> 00:17:43,200
so

456
00:17:41,039 --> 00:17:45,120
um sorry about that so let's create a

457
00:17:43,200 --> 00:17:46,559
new mouse action variable

458
00:17:45,120 --> 00:17:48,640
and then i'll actually add a space in

459
00:17:46,559 --> 00:17:51,120
between it so mouse action

460
00:17:48,640 --> 00:17:51,760
and then select for the spy only all

461
00:17:51,120 --> 00:17:55,200
right

462
00:17:51,760 --> 00:17:55,919
and then click ok and now i'm going to

463
00:17:55,200 --> 00:17:57,679
replace

464
00:17:55,919 --> 00:17:59,520
all of the previous mouse action

465
00:17:57,679 --> 00:18:03,440
variables with the new one

466
00:17:59,520 --> 00:18:05,600
so the one with the space

467
00:18:03,440 --> 00:18:06,880
okay change this to the one with the

468
00:18:05,600 --> 00:18:10,240
space

469
00:18:06,880 --> 00:18:10,720
and this one all right and then i will

470
00:18:10,240 --> 00:18:14,080
delete

471
00:18:10,720 --> 00:18:16,320
my old mouse action variable

472
00:18:14,080 --> 00:18:17,600
all right and now it should work with

473
00:18:16,320 --> 00:18:21,120
multiple turrets

474
00:18:17,600 --> 00:18:23,600
so if i try it out then all right cool

475
00:18:21,120 --> 00:18:25,520
so now i can place multiple turrets and

476
00:18:23,600 --> 00:18:28,240
the range always follows the one that is

477
00:18:25,520 --> 00:18:30,080
following my mouse

478
00:18:28,240 --> 00:18:31,440
and now i'm going to hide all of these

479
00:18:30,080 --> 00:18:33,760
variables

480
00:18:31,440 --> 00:18:34,559
and by the way the view radius variable

481
00:18:33,760 --> 00:18:37,360
will be used

482
00:18:34,559 --> 00:18:38,640
in the next video so i'll just have it

483
00:18:37,360 --> 00:18:41,120
created for now

484
00:18:38,640 --> 00:18:42,480
but i won't touch it and let's go inside

485
00:18:41,120 --> 00:18:45,679
of the enemy as well

486
00:18:42,480 --> 00:18:46,799
and hide the variables all right so now

487
00:18:45,679 --> 00:18:48,880
we have our four

488
00:18:46,799 --> 00:18:49,840
enemy lists that will be used for the

489
00:18:48,880 --> 00:18:52,960
turret

490
00:18:49,840 --> 00:18:55,039
as well as a simple turret shop where we

491
00:18:52,960 --> 00:19:00,240
can place these down

492
00:18:55,039 --> 00:19:00,240
on the map all right cool

493
00:19:01,360 --> 00:19:05,120
anyways that's it for this tutorial if

494
00:19:03,440 --> 00:19:07,520
you enjoyed it then give it a thumbs up

495
00:19:05,120 --> 00:19:08,880
and subscribe too if you haven't already

496
00:19:07,520 --> 00:19:10,640
again in this video

497
00:19:08,880 --> 00:19:12,160
we mostly just completed the setup for

498
00:19:10,640 --> 00:19:14,400
the turret aiming and shooting

499
00:19:12,160 --> 00:19:16,559
which we will do in the next video

500
00:19:14,400 --> 00:19:25,840
anyways that's it for this tutorial

501
00:19:16,559 --> 00:19:25,840
see ya