Spawn object on the side of another object

[PhilipMoss]

Hello I am trying to spawn on object on the side of another object that rotates with the mouse?
I want it so it always spawns on that side no matter what the rotation the other object is

Any tips on how to do this?

 

[TheouAegis]

Look up lengthdir_x and lengthdir_y in the manual.

The "dir" argument is your image_angle of the main object. The "length" argument is how far from the origin of the main object the new object would spawn when image_angle is 0.

Add the resultant vectors to x and y of the main object, respectively.

The two functions are essentially length*dcos(dir) and length*dsin(dir).