Inventory Project

// obj_inventory ////////////////////////////////////////////////////////////////////
/// Create the system (Create Event)
enum item {
    none = 0,
    lemon = 1
}

/// Initialize
width = 6;
height = 1;
box_size = 48;

draw_set_font(fnt_inventory);

// Create the grid
// Items
box = ds_grid_create(width, height);
ds_grid_clear(box, item.none);

// Item Cound
count = ds_grid_create(width, height);
ds_grid_clear(count, 0);

// Add/ Remove some items
repeat(5) {
    scr_inventory_pickup_item(item.lemon);
}

scr_inventory_remove_item(0, 0);

/// Draw the inventory (Draw Event)
for (var yy = 0; yy < width; yy++) {
    for (var xx = 0; xx < height; xx++) {
        var tx = x+(xx*box_size);
        var ty = y+(yy*box_size);

        draw_sprite(spr_inventory, box[# xx, yy], tx, ty);
        if (count[# xx, yy] > 0) {
            draw_circle_color(tx, ty-2, 6, c_white, c_white, false);
            draw_text(tx-1, ty-8, count[# xx, yy]);
        }
    }
}

// Scripts ////////////////////////////////////////////////////////////////////////////////////////////////
/// scr_inventory_add_item(x, y, item)
var xx = argument[0];
var yy = argument[1];
var add_item = argument[2];

// Check if out of range
if (xx != median(0, xx, obj_inventory.width-1) || yy != median(0, yy, obj_inventory.height-1)) {
    show_debug_message("Not in range!")
    exit;
}

// Get the item count
var item_count = obj_inventory.count[# xx, yy];

if (item_count == 0) {
    obj_inventory.box[# xx, yy] = add_item;
    obj_inventory.count[#xx, yy]++;

    return true;
} else if (item_count > 0) {
    if (obj_inventory.box[# xx, yy] == add_item) {
        obj_inventory.count[#xx, yy]++;
        return true
    } else {
        show_debug_message("Taken");
        return false;
    }
} else {
    show_error("The item cound is less then 0", false);
}

/// inventory_remove_item(x, y);
var xx = argument[0];
var yy = argument[1];

// Check if out of range
if (xx != median(0, xx, obj_inventory.width-1) || yy != median(0, yy, obj_inventory.height-1)) {
    show_debug_message("Not in range!")
    exit;
}

// Get the item count
var item_count = obj_inventory.count[# xx, yy];

// Make sure we have items
if (item_count > 0) {
    obj_inventory.count[# xx, yy]--;

    var remove_item = obj_inventory.box[# xx, yy];

    if (item_count == 0) {
        obj_inventory.box[# xx, yy] = item.none;
    }

    return remove_item;
} else if (item_count == 0) {
    show_debug_message("No Item");
    return item.none;
} else {
    show_error("Taken", false);
}

/// scr_inventory_pickup_item(item)
var add_item = argument[0];

// Check for item
for (var yy = 0; yy < obj_inventory.height; yy++) {
    for (var xx = 0; xx < obj_inventory.width; xx++) {
        if (obj_inventory.box[# xx, yy] == add_item) {
            obj_inventory.count[# xx, yy]++;
            return true;
        }
    }
}

// Check for empty slot
for (var yy = 0; yy < obj_inventory.height; yy++) {
    for (var xx = 0; xx < obj_inventory.width; xx++) {
        if (obj_inventory.box[# xx, yy] == item.none) {
            obj_inventory.box[# xx, yy] = add_item;
            obj_inventory.box[# xx, yy]++;
            return true;
        }
    }
}

// Show debug message
show_debug_message("The inventory is full");
return false;