Hi DesuDeus,

> Instead of an Icon maybe a shortcut would do it? Like key+click

Usually for something like that, there would be an icon for it, and you could optionally set up a keyboard shortcut for it if you wished.

You can actually set up a keyboard shortcut now for making persistent lines by installing this plugin which it sounds like you would be interested in:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1029.1


> Or to get back to the original request (line from center) why not
> have a key to press while drawing a line to enable symettry, or a
> check box like make copy in the rotation tool? That would resolve
> many problems.

Just because it is not necessary, since it is so quick to get the same result by using a construction line.

The construction line method is also a general purpose solution that works within any command, not just a special option that is limited to only the line command.

For example here I use it to draw a square positioned at a midpoint:



Another example - here drawing an arc balanced around a midpoint:


It's better to have that one general mechanism that works in all drawing commands, than to try and have a special option that is duplicated in the UI for every command.

Anyway, that is the reason why there is not currently an alternate mechanism for it.

But I have thought some in the past about adding one in just for the line command to help people who haven't learned about using construction lines.

I still may do that, I'm not quite sure - I tend to hesitate quite a bit before adding in additional UI because it tends to be difficult to remove things later and adding in too many unnecessary things generally leads to bloating the UI and making it more complex.

- Michael