【AE表达式】位移路径生成形状路径（反向跟踪路径）

finalPoint = [];
frameDuration = thisComp.frameDuration;
compDuration = thisComp.duration;
chosenOne = thisComp.layer("the layer name which you want to choose").transform.position;
for(i=0;i<=compDuration/frameDuration;i++)
{
    middlePoint = chosenOne.valueAtTime(i*frameDuration);
    finalPoint.push(middlePoint);
}
createPath(points = finalPoint, inTangents = [], outTangents = [], isClosed = false);