GML Visual Trail of instances left behind a dragged object, how fix?

[bebesnuggles]

I have no draw script, yet when I use the drag event and have the object's X and Y coords go to the mouse's X and Y. However when I do this, even on a new object it leaves a trail behind. I've tried to circumvent this by drawing the instance, only with an alpha of 0. Doesn't work. Has anyone had this happen? How should I solve it?
Thanks,

 

[chamaeleon]

I have no draw script, yet when I use the drag event and have the object's X and Y coords go to the mouse's X and Y. However when I do this, even on a new object it leaves a trail behind. I've tried to circumvent this by drawing the instance, only with an alpha of 0. Doesn't work. Has anyone had this happen? How should I solve it?
Thanks,

Do you have a background defined for the room?

 

[bebesnuggles]

Do you have a background defined for the room?

I think I do, but what do you mean by 'defined'?

 

[curato]

in GMS 2 make sure your room at least has one background layer that is set to visible and is a solid color or an image with no transparency in it.

GameMaker Manual

 

[bebesnuggles]

in GMS 2 make sure your room at least has one background layer that is set to visible and is a solid color or an image with no transparency in it.

GameMaker Manual

THANK YOU SO MUCH BRO
I've been working on this for the past couple of days. Of course just one small change will fix everything lol
Thanks again

 

[Roderick]

In case you're wondering why that happened:

Game Maker doesn't clear the screen when drawing. Instead, it draws the background on top, and then redraws everything else that should be on the screen. If you don't have a background, or if part of the background is transparent, any of the parts that aren't redrawn keep whatever was there before, and then it draws new stuff on top of that. Since you were never covering the screen with a new background, all the old drawings of your object were being left behind.