How do I find the inverse tangent of a line?

Question

I\'ve got a line (x1,y1) and (x2,y2). I\'d like to use tan inverse to find the angle of that line, how would I do so in java?

I\'d like to see what angle the line makes

Answer 1

Use the Math.atan2 function. It is like arctan but knows about x and y coordinates, so it can handles lines that are horizontal, vertical, or pointing in other directions -- arctan's range of -pi/2 through pi/2 will not give the correct answer for some lines.