tilemap_y

This function controls the position along the y-axis of the room of the asset tile map element on the layer.

You give the tile map element ID (which you get when you create a tile map element using layer_tilemap_create() or when you use the function layer_tilemap_get_id()), and then set the y value to use (based on the room coordinates).

Syntax:

tilemap_y(tilemap_element_id, y);

Returns:

N/A

Example:

var lay_id = layer_get_id("Asset_sky");
var map_id = layer_tilemap_get_id(lay_id);
tilemap_y(map_id, irandom(room_height));

The above code gets the ID value of the tile map asset assigned to the layer "Asset_sky" and then sets its y position to a random value between 0 and the height of the room.