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Keep Every N Keys.jsx
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Keep Every N Keys.jsx
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/**
* Keeps every N keyframes on selected properties.
*
* By default, keeps every 2nd key.
* Hold SHIFT to change the frequency of keyframes to keep.
*
* This doesn't delete the first or last keyframes on a property.
*
* @author Zack Lovatt <[email protected]>
* @version 1.0.0
*/
(function keepEveryNKeys () {
var interval = 2;
if (ScriptUI.environment.keyboardState.shiftKey) {
var intervalInput = prompt(
'Enter interval (2 = keep every 2nd key, 3 = every 3rd)',
interval,
'Keep Every N Keys'
);
var intervalNum = parseInt(intervalInput, 10);
if (isNaN(intervalNum)) {
alert('Enter a valid whole number!');
return;
}
interval = intervalNum;
}
/**
* Removes every {interval} keyframes on a property
* (doesn't remove first or last)
*
* @param {Property} prop Property to remove keys on
* @param {number} interval Frequency of keys to keep
*/
function keepEveryNthKey(prop, interval) {
for (var ii = prop.numKeys - 1; ii >= 1; ii--) {
if (ii % interval === 1) {
continue;
}
prop.removeKey(ii);
}
}
app.beginUndoGroup('Keep Every N Keys');
var comp = app.project.activeItem;
if (!(comp && comp instanceof CompItem)) {
alert('Open a comp!');
return;
}
var props = comp.selectedProperties;
if (!(props && props.length > 0)) {
alert('Select some properties!');
return;
}
for (var ii = 0, il = props.length; ii < il; ii++) {
var prop = props[ii];
keepEveryNthKey(prop, interval);
}
app.endUndoGroup();
})();