Aligning vertices

[luuckyy]

Hi,

I would like to know how you guys proceed to align some vertices on a diagonal ?

For example :


How would you proceed to align perfectly these 3 selected vertices on a diagonal starting from the bottom selected vertex and ending at the top selected vertex ?

I think that it can only be done manually, but just in case I'm missing something, I ask you the question.

In the case it can only be done manually, I think a new aligning tool/option could be very handy for high geometrical shapes ...