In hejtmy/eyer: Loading and preprocessing of eyetrakcer data

knitr::opts_chunk$set(fig.width=8, fig.height=6)

Eyer allows for saving data in a predefined structure and then loading them from passed folder. The package comes with both eyer_data object for testing and demosntrations, but also with raw data you can look at and test loading. It is generally installed into system.file("extdata", package = "eyer") system folder.

library(eyer)
loading_folder <- system.file("extdata", package = "eyer")
eye <- load_eyer_data(loading_folder)
str(eye)

The eyer object then allows us to do some quick operations and visualisations

plot_gaze(eye, downsample = 50) + geom_eyer_monitor(eye)

As this data comes from eyelink 1000 eyetracker, the anchor is in top left, whereas we want to plot it with 0,0 begin in the bottom left. So we needd to flip the Y axis to the 1080 value.

eye <- flip_axis(eye, "y", 1080)
plot_gaze(eye, downsample = 50) + geom_eyer_monitor(eye)

and after we are finished, we can save the data again

save_eyer(eye, "temp", "preprocessed")
list.files("temp")

We can then load the data and continue with preprocessed flipped data

eye <- load_eyer_data("temp")
plot_gaze(eye, downsample = 50) + geom_eyer_monitor(eye)

hejtmy/eyer documentation built on Sept. 18, 2019, 12:42 p.m.