Platform Part 4

 STEP 1

  The Gate Object

When you enter the boss lair you will be trapped inside and must defeat the boss to escape.

So when you get close enough to the boss it will trigger a trap that will lock you inside with no way out. Find a sprite for a gate or door that will shut when you get inside. I used this one. I erased part of the gate to make it open. You will need both sprites to make it work. In the Create Event add this code to set the sprite to open.

In the Draw Event of the Gate add this code to draw the correct sprite.

 Make oBock the parent of the gate so you can walk on it. Place the gate in your room so you can walk into the boss lair.

STEP 2

 The Gate Object code

We will put the code to change to gate to closed in the boss object. 

Go to the step event and place this at the top replacing lines 1-7 with the new code.

You will notice that we will play two sounds as well.

• • Gate slamming sound 

  • Evil laugh

Sound effects add to the game play experience so use them.

Since the gate is a child of the block you wont be able to walk through it when it slams shut.

STEP 4  

Boss Lair Pipe Object

Find a sprite for an object that can fall, I used the pipe. Make the pipe objects parent the block so you can walk on it and add this code to a Collision Event with the Block.

This code will detect if the pipe if moving if it is it will stop it, play a crash sound and destroy the falling chain object.

I also made the depth of this object 1 so that the fire trap is in front of the pipe.

STEP 6  

 Chain Object

Add a collision event with the arrow and the sword object add the following code. 

The code will destroy the chain object and create a top chain that doesn't move and a bottom chain that falls with the pipe.

It also plays a sound.

STEP 7  

 Falling Chain Object

The falling chain object is your oChainbot.

This object will fall down make the pipe start to fall.

Notice the "with oPipe" construction

this type of code cause that pipe to start moving down. 

This is how you can control objects with other objects.

STEP 8  

 Boss Drops Wand

Now we will work on using a third attack which will be a wand that will drop from the boss when you defeat him. This is our first upgrade so with that comes some nice additions to the game

We will make the wand object I used this sprite

Call this obj_wand 

We want the boss to drop it when he dies so add the following code to both the arrow and sword collision events in your boss

You could also make the boss drop a key to unlock the way to the princess.

STEP 9

 Wand Object

Now we will add the code for the wand object.

We want it to drop to the ground when it is created and have a message stored in the create event.

Notice that the variable message has text stored in it instead of a number.

The step event just makes the wand fall to the ground.

STEP 10

 Get the Wand Attack

Now that we see the boss drop the wand we want to pick it up so we can use it.

We will also display a message giving us information about the wand.

So we must add a few variables to the create event of your player

Don't remove the old variables just add the new ones 

this third weapon variable holds a string or words instead of a number

Change your Step Event code line 7 the weaponselect now must have 3 choices so toggling doesn't work anymore we add one to your weaponselect then check to see if we are greater than total weapons if so reset to weapon 0.

We also need to be able to shoot wand when we learn the skill so we have to add some code for that. Under your sword attack code place the third bit of code.

Also we have to change some of the other code since we have a new state called attackwand we have the check if your NOT in a state of attackwand to go into an idle state. 

The last item is to draw a sprite for the wand attack I used this one:

 STEP 11

Fireball Object

Now we need to make a fireball object just like our arrow object but with a fireball sprite

I used the above sprite

Center this sprite and create an Object for it called oFireball

Add a create event to get it moving and a outside view[0] Event to destroy it that way you can shoot outside of your view.

Remember your view is what you can currently see in the room.

STEP 12

 Create Fireball

Now we want to make a fireball just like the arrow so we will do it in the Animation End event add this to the switch statement in the animation end.

To make the fireball damage enemies just make its parent the arrow

STEP 14 

 Princess Draw Event

To give a good visual effect we want the Princess to look powerful so we will add an aura around her we also want a magical looks effect appear when she teaches you how to use energy. I used the sprites above

Find two sprites and center the origins.

The draw event will checks if your state is spell if it is it slows down the image speed to .2, draws the energy on the player and on the princess and sets your players energy amount to 100.

Then it sets image speed back to normal and draws the Princess and the aura.

Now we have to end the state of spell somehow we will use the animation end event to do this code to go back to a state of talk

state=talk;

STEP 15

 Health and Energy Regeneration

You will notice that after you fire your wand you lose energy and when it gets too low you can shoot anymore. Your health also decreases.

We will add a slow regeneration code.

Put this code in the step event of your character under your weapon select code.

STEP 17 

Boss Monster Create Event

In the create event we will initialize all the variables we will use for our boss.

These will look familiar since we have used them in your character. The code can be used over and over again.

STEP 18

 Boss Monster Alarm Event

The Boss needs to be able to attack, We use an alarm event to make him attack every 3 seconds.

Add alarm[0] event and put the following code to make the can_attack variable trigger every 3 seconds

Remember 30 steps is equal to one second.

STEP 19

  Boss Monster Step Event

The step event uses much of the same code as other enemies but it also adds states like your player.

Since we want the boss to perform a series of events based on the players position, amount of hit points we must add some extra code to make all this happen.

 Boss Monster Step Event Lines 1-7

Code Breakdown. To make the boss perform the desired actions we must have conditions that can be checked. If the conditions are met then the boss will go to a certain state.

The boss starts in an idle state which means he just stands and does nothing he is waiting for you to get close enough.

We check two things distance to person and if boss is idle. Both of these conditions must be true for the code to run.

If the two are true we set the state to getbow we will discuss what that does latter. 

 Boss Monster Step Event Lines 8-12

After the Boss has got the bow he is in a state of attackbow. However in our plan we want the boss to switch to a trident when is health goes below 50%.

So we check if we are in a state of attackbow and hpamount < 50 

The && means and in programming.

If these two conditions are met we go to a state of gettrident

 Boss Monster Step Event Lines 14-17

We want the boss to have AI (artificial intelligence) attacking. This means he will only attack you if you are within range of his trident otherwise he will patrol back and forth.

Three conditions must be met for this to take place.

1. distance to person is less than 200 pixels

2. state must be walktrident

3. can_attack = 1

If these three conditions are met he goes into a state of attacktrident

Lines 19-75 have been explained earlier so we will move on to new stuff.

STEP 21 

Boss Monster Animation End Event

Add an animation end event and add the following code. 

In the code you will notice it does different things depending upon what state your boss is currently in. 

If your boss in in attackbow state and can_attack=1 which means he is attacking he will create an arrow play an arrow firing sound and set can_attack to 0

So to make these happen you have to create a new object called oBossarrow and find a sound to play when the arrow fires.

If your boss is in attacktrident state

it changes your state to walktrident and can_attack to 0 and jump to 0

It is important to remember that if your animation is too short the animation end event will occur and stop your attack. So you have to lengthen your attack animation to match how long you want your attack to last I made mine 20 frames in length so 2/3 of a second attack.

STEP 22

 Boss Monster Collision with Bow Object

Add an collision with the bow object you made in step 29 

Add the code.

This code will destroy the bow object

Go to attackbow state and stop the character from move thus dir=0

Remember:

• • dir = 1 move right

  • dir = -1 move left

  • dir = 0 no movement

STEP 23  

Boss Monster Collision with Trident Object

Add an collision with the trident object you made in step 29 

Add the code.

This code will destroy the trident object

Go to walktrident state and make the character move left

STEP 24  

Boss Health

We will draw the healthbar for your boss using the oHealth object. The same object that is drawing the healthbar for your character.

So in the draw event add this code below the first the numbers may need to be changed depending upon the size of the sprite of your boss.

STEP 26

 Hurting the Boss with Sword

Now that the boss has a health bar we want to be able to hurt him with your arrows and blade.

To do this add a collision event in your boss object with your attack sword object and add the following code.

This code will destroy the sword object take away 3 health from boss check if boss has no health and if so destroy boss and give you points.

STEP 27

 Rope Swing

This is how to make a rope to swing across pits

Create an obj_rope give it a sprite like this. Make the origin 2,0

STEP 28

 Thors Hammer Weapon

This is how to make a Thors Hammer which will return to you after you throw it.

Create two objects  oHammer and oHammerBack with a sprite like this they will both use the same sprite.

You will need to have an action that creates the hammer so either have a new button to create it or switch your weapon from sword to bow to hammer. 

To make the hammer have more range increase the number of sprites in the sub-image.

The obj_thor.throw=0  will allow Thor to throw another hammer this avoids have two hammers thrown at same time. You will need to change the name obj_thor to the name of your player unless you are using this code for a boss enemy.

To make the hammer collide with Thor we need to use collision_circle function since the Step toward function won't allow the hammer to collide with Thor instead it will just circle him.