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 in relation to x1,y1

Answer 1

Java has a builtin function in the Math library called atan2() that does what you need. In this case, you'll want to make sure to subtract the y & x values as atan2() assumes you're starting from the origin. (Also note, it takes y 1st and then x)

Math.atan2(y2-y1, x2-x1); //returns the relevant angle in radians

Hope this helped!