GameMaker Drawing interfaces with GUI?

[DirtyLibrary]

I'm trying to create a menu/interface, which is docked at the bottom of the screen and displays sprites all of the buildings the player can create, along with a "purchase" button next to each of the sprites. The player clicks the button to open up the interface, which pops up, but the buttons are only clickable when the mouse is over a certain position? The map moves with viewports when the cursor is near the edge of the screen, so the objects are not always in the same position.

Code that displays the objects on screen:

var posX = 500;
obj1 = instance_create_layer(100, posX, "GUI", obj_bm_placeholder);
purchase = instance_create_layer(100, posX+30, "GUI", obj_bm_purchase);
obj1.itemID = "palace";

obj2 = instance_create_layer(210, posX, "GUI", obj_bm_placeholder);
purchase = instance_create_layer(210, posX+30, "GUI", obj_bm_purchase);
obj2.itemID = "mineshaft";

obj3 = instance_create_layer(320, posX, "GUI", obj_bm_placeholder);
purchase = instance_create_layer(320, posX+30, "GUI", obj_bm_purchase);
obj3.itemID = "watersupply";

Draw GUI event:

var spritename = asset_get_index("spr_construction_" + string(itemID));
draw_sprite(spritename, 0, x, y);

any advice would be appreciated.

 

[TheouAegis]

Don't use room-instance positioning. Use view or screen positions. Or use the GUI event.

 

[Binsk]

To expand on what @TheouAegis said, because the GUI follows the camera you'll need to convert coordinates at some point so they match up.

1) If you use the EVENT mouse_click or whatever, you'll need to constantly move the object positions so that they match up to the view so that the clicking is in the right spot.

2) If you do your OWN click detection for your objects you can either 1) Convert the object positions to the camera location (similar to (1)) or convert the mouse coordinates away from camera location. If you do this you can either subtract the view location from your mouse_x/y coordinates or you can instead use window_get_mouse_x/y functions instead.

 

[Matt Hawkins]

I'd use

device_mouse_x_to_gui(0)