thanks guys, but you guys still didn't get my point, I am not looking for square shape, i am looking for square line, only the lines not the shape, I try that before, but what about yellow color? yes it is right, just with paint bucket, than how do I keep the line?

thanks a lot guys, it looks very simple and silly question, but I am using this tool a lot, so i need find out what is the best way,

any more smart guys around here, please remember we talk about line not shapes.

thanks guys, waiting for respond