Connecting Two Keyframes To Start And End Point of Workspace

[Dan Ebberts]

Do you mean the work area? Expressions don’t have access to the work area start and end times. Scripting does, so you could do it with a script, but it wouldn’t adjust automatically when you change the work area.

[Kamiar Babaei]

Yes, work area,

Than maybe the script can have a refresh button for when I want to update it to the new work area length?

[Dan Ebberts]

It could, but that would require a UI for the script, which is a bit of work. Here’s how the basic functionality might look though:

function setKF(){
	var myComp = app.project.activeItem;
	if (! (myComp && (myComp instanceof CompItem))){
		alert("No comp active.");
		return;
	}
	var myProps = myComp.selectedProperties;
	if (myProps.length == 0){
		alert("No property selected.");
		return;
	}
	var myProp = null;
	for (var i = 0; i < myProps.length; i++){
		if (myProps[i].numKeys >= 2){
			myProp = myProps[i];
			break;
		}
	}
	if (myProp == null){
		alert ("No property with 2 or more keyframes selected.");
		return;
	}
	var tStart = myComp.workAreaStart;
	var tEnd = tStart + myComp.workAreaDuration;
	var myExpr = "t = linear(time," + tStart + "," + tEnd + ",key(1).time,key(numKeys).time);\rvalueAtTime(t)";
	myProp.expression = myExpr;	
}
setKF();

[Kamiar Babaei]

Thank you so much.