|index||The index of the tile to set.|
|alpha||The transparency of the tile.|
With this function you can set the alpha value (transparency) of
individual tiles. This can be anywhere between 0 and 1, where 0 is
completely transparent and 1 is completely opaque. This is not
permanent and if the player leaves the room and returns to it
again, the tile will have it s original alpha value (if it was
placed in the room editor and the room is not persistent).
tile = tile_layer_find(-1000, mouse_x, mouse_y);
if tile_get_alpha(tile) < 1
The above code will first get the index of a tile at the mouse position with a depth of -1000 and then use that value to check whether the tile alpha is less than 1 or not, and if it is it sets the tile alpha to 1.