The ship is the key to the game and most of the code will lie here.
The ship is the key to the game and most of the code will lie here.
Embedded Files
Create a new scene with RigidBody2D as root
Create a new scene with RigidBody2D as root
Rename it to Player
Rename it to Player
Add a Sprite2D and CollisionShape2D as children
Add a Sprite2D and CollisionShape2D as children
Save the scene as player.tscn
Save the scene as player.tscn
Use player_ship.png as the texture of the Spite2D
Use player_ship.png as the texture of the Spite2D
Scale it down to 0.5
Scale it down to 0.5
Set Rotation to 90
Set Rotation to 90
We rotate the spite because in Godot, 0 degrees points right.
We rotate the spite because in Godot, 0 degrees points right.
Select the CollisionShape2D Node
Select the CollisionShape2D Node
Add a new CircleShape
Add a new CircleShape
Cover the ship with it
Cover the ship with it
FINITE STATE MACHINES (FSM)
FINITE STATE MACHINES (FSM)
When using and FSM, an entity can only be in ONE state at a time. An FSM needs a number of states and what events cause a transition from one state to another.
When using and FSM, an entity can only be in ONE state at a time. An FSM needs a number of states and what events cause a transition from one state to another.
Add a script to the Player node
Add a script to the Player node
define the 4 possible states
define the 4 possible states
set the initial state
set the initial state
Now create the change state function
Now create the change state function
To manage state transitions
To manage state transitions
Add variables to define
Add variables to define
ship movements
ship movements
In Space there is no friction and nothing to slow you down, however in a game we want the ship to come to a stop when you let go of the keys.
In Space there is no friction and nothing to slow you down, however in a game we want the ship to come to a stop when you let go of the keys.
Select the Player node
Select the Player node
Set Linear Damp to 1
Set Linear Damp to 1
Set Angular Damp to 5
Set Angular Damp to 5
Create a function to get input
Create a function to get input
If dead or initializing exit the function
If dead or initializing exit the function
If thrust is pressed
If thrust is pressed
move forward in current direction
move forward in current direction
rotate according to the axis pressed
rotate according to the axis pressed
Constantly check for input
Constantly check for input
In the process function
In the process function
In physics process
In physics process
update built-in physics variables
update built-in physics variables
What is delta?
What is delta?
delta is the amount of time (in seconds) that passed since the previous frame.
delta is the amount of time (in seconds) that passed since the previous frame.
Because a computer's frame rate can fluctuate—running at 60 FPS one moment and 120 FPS the next—moving an object by a fixed pixel amount each frame makes the game run twice as fast on faster screens or lag on slower ones.
Because a computer's frame rate can fluctuate—running at 60 FPS one moment and 120 FPS the next—moving an object by a fixed pixel amount each frame makes the game run twice as fast on faster screens or lag on slower ones.
Multiplying your movement speed by delta (e.g., position += velocity * delta) guarantees:
Multiplying your movement speed by delta (e.g., position += velocity * delta) guarantees:
- Framerate independence: Your game runs at the exact same physical speed whether the player is on a 30 Hz budget laptop or a 240 Hz gaming monitor.
- Real-world units: Speeds are measured in pixels per second, rather than pixels per frame.
(Note: Godot's built-in physics functions like move_and_slide() on a CharacterBody2D or constant_force on a RigidBody2D factor in delta automatically behind the scenes!)
(Note: Godot's built-in physics functions like move_and_slide() on a CharacterBody2D or constant_force on a RigidBody2D factor in delta automatically behind the scenes!)
Run the scene (Press F6) You should be able to fly around the screen with WASD now
Run the scene (Press F6) You should be able to fly around the screen with WASD now
We want to setup screen wrapping so that when the ship flies off the edge of the screen it appears again at the opposite edge. Because our root node is a physics body (RigidBody2D) we cannot just change it's position we have to use a special method to change its physics properties called integrate forces
We want to setup screen wrapping so that when the ship flies off the edge of the screen it appears again at the opposite edge. Because our root node is a physics body (RigidBody2D) we cannot just change it's position we have to use a special method to change its physics properties called integrate forces
Add a variable for screensize
Add a variable for screensize
Calculate the screensize when the scene loads
Calculate the screensize when the scene loads
Normally, you cannot change a RigidBody2D's position directly in code because Godot's physics engine overrides your changes. _integrate_forces() hands you a backstage pass (physics_state), allowing you to manually read and update the body's internal physics data without causing glitches or fighting the simulation.
Normally, you cannot change a RigidBody2D's position directly in code because Godot's physics engine overrides your changes. _integrate_forces() hands you a backstage pass (physics_state), allowing you to manually read and update the body's internal physics data without causing glitches or fighting the simulation.
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