inventory = ds_list_create(); ds_list_add(inventory, "Potion", "Shield"); // Clean up later: ds_list_destroy(inventory); Use code with caution.
// Variable assignment player_name = "Player 1"; player_health = 100; is_alive = true; Use code with caution. 2. Built-in Variables
// Create Event enum states IDLE, WALK, JUMP, ATTACK state = states.IDLE;
You attach your GML code to an object's . This is the core of the event-driven architecture. Common events include:
Don't write 500-line Step events. Use an Enum and a state variable. gamemaker studio 2 gml
To see GML in action, let's look at a basic, robust platformer movement script. This code would live in the of a player object ( obj_player ).
One of GameMaker's most celebrated features is offering two distinct ways to program. Understanding the difference is vital for choosing the right workflow.
Before diving into the code, it's crucial to understand that GML is primarily an event-driven language. This means your code is not a single, linear script. Instead, it is organized into blocks attached to specific within an Object . For example, you might write movement code in a "Step" event that runs every frame, or collision code in a "Collision" event that triggers when two instances meet.
Memorize these. They are the bread and butter of GMS2. Built-in Variables // Create Event enum states IDLE,
To keep your project scalable and running smoothly, adapt these habits early:
(Deducting one point for occasional IDE bugginess and a historically confusing pricing structure, though the language itself is a 10/10 for beginners).
By starting with GML fundamentals, adopting best practices early, and gradually exploring more advanced techniques, you can transform your game ideas into reality with confidence. Whether you are a solo hobbyist or an aspiring professional, mastering GML is your most direct path to creating the games you've always dreamed of.
Here is a quick example of how simple it is to move a character using GML. You would place this code inside the of your player object. Use an Enum and a state variable
: Unique to a specific object instance, declared without keywords (e.g., hp = 100; ). They persist for the lifetime of that instance.
No classes, no main loops, no imports. It’s perfect for beginners or artists-turned-coders.
// 1. Get Player Input var _move_right = keyboard_check(vk_right) || keyboard_check(ord("D")); var _move_left = keyboard_check(vk_left) || keyboard_check(ord("A")); var _move_up = keyboard_check(vk_up) || keyboard_check(ord("W")); var _move_down = keyboard_check(vk_down) || keyboard_check(ord("S")); // 2. Calculate Movement Vectors var _hmove = _move_right - _move_left; // Results in -1, 0, or 1 var _vmove = _move_down - _move_up; // Results in -1, 0, or 1 // 3. Normalize Diagonal Speed (Prevents moving faster diagonally) var _move_speed = 4; if (_hmove != 0 && _vmove != 0) _move_speed = 2.83; // 4 divided by the square root of 2 // 4. Collision Checking and Movement var _target_x = x + (_hmove * _move_speed); var _target_y = y + (_vmove * _move_speed); // Horizontal Collision with Solid Object if (!place_meeting(_target_x, y, obj_solid)) x = _target_x; // Vertical Collision with Solid Object if (!place_meeting(x, _target_y, obj_solid)) y = _target_y; Use code with caution. 7. Best Practices for Writing GML