Hello!
I`m new with Kinovea and like to made a easy bike fitting.
The first step for me is the coordinate system, because the camera ist not always 100% in the middle.
I display the corrdinate system with:
Tools / Coordinate Systems
Then I set a line and with right mouse click I use:
Cailbrate
There I set the length of the line and set "The line defines the horizontal axis"
This is wokring.
But when I try to made a horizontal line with holding the "Shift" key, it draw the horizintal line to the window, not to the coordinate system.