it took me like 4 hours to figure out this whole process. - Read bellow. - It bugs if u draw independent dots ill fix that. Also thanks to @griffpatch for his tutorial on save my game. I made a similar system to decompile the items on the list.
Basically what it does is clones what you draw but resized (in this case divided by 2) and on other coordinates. When you are holding to draw click it files your mouse coordinates on a list (xpos;ypos) and then repeats it. You can look at the code as said it took me a lot of time.