flip_axis.RdSome eyetrackers output its data with inversed values. E.g. Eyelink returns data with 0,0 in the left top corner, but visualisations make more sense with 0,0 being projeccted to the left bottom corner. So we neeed to "flip" the Y axis. But we also need to define the new "anchor". In our case, if we want the current 0,0 to become left top corner, we want to reanchor the "y" axis with 0 to be at current height (e.g. 1080).
flip_axis(obj, axis, anchor)
| axis | string of which axis to flip. c("x", "y") |
|---|---|
| anchor | what is the value of new 0? Needs to be deffined |
this function flips given axis (x or y) anchored to the anchor value.