OK, I have a picture which will hopefully make my explanation a bit clearer.
I have a line (a, b) to (x, y) and all I know is the end points of the line.
I am trying to draw a line from the end point of the original line.
It will have an angle of theta from the original line and a length of l.
Based on these two values I need to work out the coordinates of the end point of this new line.
Length l can be any positive value. Angle theta can lie anywhere from -80 degrees to +80 degrees.
Thanks for any help you can provide.
::Gets out pen and paper and starts scribbling::