Draw Perpendicular Line

[demisjohn]

I would love a "Draw perpendicular line" measurement.
Olympus Stream software in our lab has this implemented really nicely.

You draw one line, say along a sample edge, then the second line comes out perpendicularly from that, and this one has a distance measurement on it.

Example:

We should be able to have the user draw a line ROI, choose "Draw Measurement - Perp. Line" which then allows the user to choose the a point, and it'll draw a perpendicular line from the original ROI to the point the user chose, and show the measurement there.