Cartesian XY bearing between points .Net

Question

I am looking for a way to calculate the bearing or azimuth (0-360°) of one drawing point, or pixel, or screen coord, to another.

I currently have the distance portion of it, and with maths not being the favourite subject in my schooling days, I am turning to this for assistance.

I've seen numerous examples of calculating distance and bearing of latitude and longitude, but I only want to calculate screen coordinates. At a later date, I will convert these to Lat/Long.

Screen coordinates originate top/left at (0,0) so I am aware of this. I also need the ability to move the 'origin' with the mouse. This is something that I can already easily do. Part of the question is do I have to convert the points into proper cartesian points (i.e. with negative values of points 'south' and 'west' or 'below' and 'left' of the origin?

Answer 1

it is something like arctan( (x2-x1)/(y2-y1) )