GD Script Overview

Introduction

• GD Script is a high-level, object-oriented, imperative programming language with Python-like syntax.
• Designed specifically for the Godot Engine (GDAU).
• In this video, we'll learn about key concepts, from variables to signals, tailored for beginners.
• Focus areas include:
  • Variables
  • Conditionals
  • Inheritance
  • Dictionaries
  • Signals

Video Structure

• The video is an overview, not an exhaustive tutorial.
• Beginners are encouraged to pause and experiment as they go along.
• Each section is clearly named for future reference.
• Seasoned programmers will also find this overview useful while transitioning to GD Script.

Getting Started with GD Script

• An introductory suggestion is to begin with a GDAU tutorial for complete beginners.
• The video is sponsored by Code Crafters for software skill enhancements.

Hello World Example

1. Creating a Scene:
   • Create a new node (Main), and save as a scene.
2. Adding a Script:
   • Script name should be main.gd.
3. Defining Functions:
   • ready(): Executed when the node enters the scene tree.
   • Replace pass with print("Hello World").
4. Running the Game:
   • Run the scene and observe messages in the console.

Key GD Script Syntax

• Statements end in new lines. No semicolons needed.
• Indentation is crucial for defining code structure (similar to Python).
• Case-Sensitivity: e.g., Print is different from print.

Displaying Text in Game

• Create a Label Node to display text.
• Accessing Node Properties:
  • Drag and drop the label into the script to create a reference.
  • Set label.text = "Hello World" to show it in-game.

Handling Input

• Configure Input Actions:
  • Add an action in Project Settings (e.g., Space bar).
• Create an input(event) function to handle actions.
  • Change colors based on pressed actions (e.g., turn label red).
  • Use if event.is_action_pressed("my_action") to check the input.

Variables

• Variables in GD Script are simple containers for data.
• Declare using var variable_name = value.
• Example: var health = 100.

Conditionals

• Use if statements to control logic flow.
• Example:

  if health <= 0:  
      print("You died.")  
  else:  
      print("You are healthy.")  
  

Comments

• Use # to write comments in code.
• Example: # This is a comment

Functions

• Functions are reusable blocks of code defined with func function_name():.
• Can have input parameters and return values.

Classes and Instances

• GD Script uses object-oriented principles.
• Classes act as blueprints for objects in your game.
• Example:

  class_name Character  
  

Signals

• Signals are used to notify other nodes when something happens.
• Connect signals in the Godot editor for decoupled architecture.

Conclusion

• This overview should help you understand the basics of GD Script.
• Further resources can be found in the official Godot documentation.