Year 9 Game Development 4 - Gameplay

• Computer Science
• Lower Secondary (Key Stage 3)

Game Development 4 - Gameplay

Key Vocabulary:

Game engine

Placeholder

Asset

Script

Sprite

Object

Instance

Collision

Event

Today's lesson objectives: 

Create your first objects and scripts to add functionality and gameplay to your game.

Starter & recall - Drag and drop

Allowing a two way flow of information between a computer and it's user/ responding to a user's input.

Features of a game, such as it's plot and the way it is played or feels.

A blueprint or template that defines the attributes and methods that objects of a specific type will have.

Basing classes on another class.

A fundamental building block of Object Oriented Programming, representing a real-world entity with specific characteristics.

A collection of user defined functions or variables that you write as snippets of code in the Script Editor

A piece of work; art, code, sound, etc. contained in the program.

Interactive

Gameplay

Class

Inheritance

Object

Script

Asset

🥈 Silver: 

Think;

What do you think "collision" means in Gamemaker?

What can a "collision" do?

🥈 Silver: 

Pair;

What do you think "collision" means in Gamemaker?

What can a "collision" do?

🥈 Share: What do you think "collision" means in Gamemaker?
What can a "collision" do?

🥇 Gold

Create Some Objects

• Last week we created sprites (some made placeholder art, some drew something more complex).                                        "spr_bullet", "spr_player", "spr_rock_big", "spr_rock_small"

• Using the same method, create 4 objects.

1. Right click in the asset browser > Create > Object
2. Rename the objects "obj_bullet", "obj_player", "obj_rock", "obj_game".
3. In each of the object's workspace, change the sprite to the matching one, obj_rock should use spr_rock_big. obj_game is invisible and doesn't need a sprite, we will use this to control the game.

🥇Gold:
1: Upload a screenshot of your objects.
2: What makes a cat, a cat?

🥉 Platinum

• Place your objects in the room:

1. Open room1.
2. There are two layers of the room on the left of your screen. Instances and background. Select instances.
3. Click and drag one obj_player into the room, then some obj_rocks, around 6. Each of these is an instance of their object

• Let's add some controls:

1. In your Asset Browser, double-click on obj_player.
2. In the "Events" window, select add event > step > step

• You might be asked to choose between GML Code and GML Visual. Choose GML Code.
• The GML code window will now be open, add this code:

1. if keyboard_check(vk_up)
2. {
   
3.         motion_add(image_angle, 0.1);
   
4. }

• Now when you run you game, you can fly forwards. vk_up refers to the up key on the keyboard. 
• Continue with the project as per the guide here: LINK

🥉 Platinum Screenshot your objects and code to show your progress.