Millisecond Forums

Hello, 

I am working on a task :https://mili2nd.eu/2n6b
In this task, you hear a person say something and then see their hand begin to reach or withdraw from an object. A line (with a segment missing) then appears on the screen. This line should be exactly in line with the tip of the persons fingers (most leftward position of their hand). Like this :

The line seems to be aligned correctly when I run the task using a monitor with 1920x1080 resolution. When I run the task on a different resolution, the line is not aligned correctly, like this:

I tried to resolve this using the canvas size settings but the problem currently persists. The task is programmed using image stimuli that are 1920x1080 and a list of the x and y coordinates (in pixels) of the tip of fingers that is used to position the line. 

Please could you help me resolve this issue so that the line is always shown in the correct position on all monitors. 

Thanks,
Katrina