HoshinoKoji/jsPsych
1
0
Fork 0
mirror of https://github.com/jspsych/jsPsych.git synced 2025-05-10 11:10:54 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

add round_predictions parameter

Browse Source
This commit is contained in:
Josh de Leeuw 2021-02-05 13:31:04 -05:00
parent d584faa71d
commit 7c7fda1959
2 changed files with 15 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
docs/extensions/jspsych-ext-webgazer.md
View File

@ -16,7 +16,8 @@ jsPsych.init({
Parameter | Type | Default Value | Description Parameter | Type | Default Value | Description
----------|------|---------------|------------ ----------|------|---------------|------------
webgazer | object | `undefined` | You can explicitly pass a reference to a loaded instance of the webgazer.js library. If no explicit reference is passed then the extension will look for a global `webgazer` object. webgazer | object | `undefined` | You can explicitly pass a reference to a loaded instance of the webgazer.js library. If no explicit reference is passed then the extension will look for a global `webgazer` object. If you are loading webgazer.js via a `<script>` tag you do not need to set this parameter in most circumstances.
round_predictions | bool | true | Whether to round the `x`,`y` coordinates predicted by WebGazer to the nearest whole number. This *greatly* reduces the size of the data, as WebGazer records data to 15 decimal places by default. Given the noise of the system, there's really no need to record data to this level of precision.
## Data Generated ## Data Generated

16
extensions/jspsych-ext-webgazer.js
View File

@ -21,6 +21,12 @@ jsPsych.extensions['webgazer'] = (function () {
} else { } else {
state.webgazer = params.webgazer; state.webgazer = params.webgazer;
} }
if (typeof params.round_predictions === 'undefined'){
state.round_predictions = true;
} else {
state.round_predictions = params.round_predictions;
}
// sets up event handler for webgazer data // sets up event handler for webgazer data
state.webgazer.setGazeListener(handleGazeDataUpdate); state.webgazer.setGazeListener(handleGazeDataUpdate);
@ -129,6 +135,10 @@ jsPsych.extensions['webgazer'] = (function () {
extension.getCurrentPrediction = async function () { extension.getCurrentPrediction = async function () {
var prediction = await state.webgazer.getCurrentPrediction(); var prediction = await state.webgazer.getCurrentPrediction();
if(state.round_predictions){
prediction.x = Math.round(prediction.x);
prediction.y = Math.round(prediction.y);
}
return prediction; return prediction;
} }
@ -139,9 +149,9 @@ jsPsych.extensions['webgazer'] = (function () {
function handleGazeDataUpdate(gazeData, elapsedTime) { function handleGazeDataUpdate(gazeData, elapsedTime) {
if (gazeData !== null && state.activeTrial) { if (gazeData !== null && state.activeTrial) {
var d = { var d = {
x: gazeData.x, x: state.round_predictions ? Math.round(gazeData.x) : gazeData.x,
y: gazeData.y, y: state.round_predictions ? Math.round(gazeData.y) : gazeData.y,
t: performance.now() - state.currentTrialStart t: Math.round(performance.now() - state.currentTrialStart)
} }
state.currentTrialData.push(d); // add data to current trial's data state.currentTrialData.push(d); // add data to current trial's data
} }