// 1. GET USER INPUTS var _key_left = keyboard_check(vk_left) || keyboard_check(ord("A")); var _key_right = keyboard_check(vk_right) || keyboard_check(ord("D")); var _key_jump = keyboard_check_pressed(vk_space); // 2. CALCULATE HORIZONTAL MOVEMENT var _move = _key_right - _key_left; hsp = _move * walk_speed; // walk_speed initialized in Create Event (e.g., 4) // 3. CALCULATE VERTICAL MOVEMENT (GRAVITY) vsp = vsp + grv; // grv initialized in Create Event (e.g., 0.5) // Check if standing on solid ground using collision mask checking var _on_ground = place_meeting(x, y + 1, obj_solid); if (_on_ground) && (_key_jump) vsp = -jump_speed; // jump_speed initialized in Create Event (e.g., 10) // 4. HORIZONTAL COLLISION (Pixel-Perfect) if (place_meeting(x + hsp, y, obj_solid)) while (!place_meeting(x + sign(hsp), y, obj_solid)) x = x + sign(hsp); // Approach the wall pixel by pixel hsp = 0; // Stop movement x = x + hsp; // Commit horizontal movement // 5. VERTICAL COLLISION (Pixel-Perfect) if (place_meeting(x, y + vsp, obj_solid)) while (!place_meeting(x, y + sign(vsp), obj_solid)) y = y + sign(vsp); // Approach the floor/ceiling pixel by pixel vsp = 0; // Stop movement y = y + vsp; // Commit vertical movement Use code with caution. 6. Best Practices for Writing Clean GML
: GML now includes full exception handling to test code and prevent games from crashing upon encountering fatal errors.
While GameMaker offers a visual, drag-and-drop system for beginners, the true power of the engine lies in . GML is GameMaker’s proprietary, typed scripting language. It gives you absolute control over your game’s logic, performance, and mechanics.
// Typically initialized in the Create Event hp = 100; max_hp = 100; player_name = "Hero"; Use code with caution. Global Variables
GML is an interpreted, C-style scripting language. It shares structural similarities with JavaScript, C++, and C#, making it highly intuitive if you have prior programming experience. Why Skip Visual and Code in GML?
