Variables in GameMaker are used to store data that can change during the play of a game. They can hold numbers, strings, arrays, structs, and more. Here's an overview of how to use them effectively.
In GameMaker, you declare a variable by assigning it a value. For instance:
This code creates a local variable
health with a value of 100.
Global variables are accessible from anywhere in your game. You create one using the
Instance variables belong to instances of objects. You don't need to declare them explicitly; simply assign a value to them within an object's events:
The scope of a variable determines where it can be accessed:
Local Variables: Exist only within the script or event they are declared in.
Instance Variables: Belong to an instance of an object and are available to all events within that object.
Global Variables: Accessible from any instance or script.
Arrays are used to store lists of values. You can create and access array elements like so:
Structs allow for more complex data structures:
To access struct members, use the dot operator:
When using variables, make sure to keep their scope as limited as necessary. This helps prevent bugs and keeps your code clean and readable. Also, naming your variables descriptively will make it easier to understand what they represent when you or someone else reads your code in the future.
In summary, understanding variables in GameMaker is essential for developing games that store and manipulate data throughout gameplay. With proper use of variable types and scopes, you can create dynamic and engaging games.