A simple demo showing how to create a GUI with FMX to let the user draw two intersecting lines and then compute and show the angle between the two lines.
The use has to click on 3 points: the point where the lines intersect, the point where the first line (red) ends and the point where the second line (green) ends.
The user interface is updated in real-time following mouse movements.
Full source code can be found there: https://github.com/fpiette/Delphi-FMX-Line-Angle-Demo
