Angle Measurer in C#

Question

I want to make a tool that can measure angles between two user defined spots on a form. I have no code to do this at the moment, so any code would be appreciated.

Th

Answer 1

similar to In silico's answer, you can use a combination of a dot product and cross product to get the angle, and not just the undirected angle.

where a and b are vectors run from the point you want to calculate the angle from to the corners of your picture boxes, respectively.

a*b = |a| |b| cos theta

axb = |a| |b| sin theta

axb / a*b = tan theta

atan2(axb, a*b) = theta