Delphi IDE Line Length

In Delphi 7 IDE, do the lines need to be a given length? I see a gray line in some Delphi code I'm workin开发者_开发问答g with, and it looks like ever line ends right before it.

It's called the right margin. It is intended as a guide to help you avoid writing lines that are too long and exceed your coding standards. You can switch it off from the Editor Options, as I have done here:

It's just a guide to line length. Some people don't like long lines because they can be hard to read on different resolutions or when doing comparisons.

That gray line is called the margin.

You can set its visibility and position in the Editor Properties at the Display tab in the Margin and gutter groupbox.

The margin is a visual assistent. The standard position is 80 characters, which defaults to the maximum unscrolled size of many source formatting output media, such as the one used here at Stack Overflow. Originally, it had something to do with the paper width on (matrix) printers. Maybe it still does.