Expression help for lower third underline

[Chris Breaux]

As you can tell my under line is not center with my text.

My text is right aligned and the tracking animates.

The underline has the anchor point set to the right corner.

The underline layer is parented to the text layer.

As the text moves to the left the underline grows from the center instead of the right and this is somehow throwing off the underline..

How can I modify my expression to so that the underline grows only from the right and does not bleed into the title safe margin?

Here is the code I’m using:

// Paste this to ShapePath -> Size

margin = 50;

text_width = thisComp.layer(“Text”).sourceRectAtTime().width;

text_height = thisComp.layer(“Text”).sourceRectAtTime().height;

box_width = text_width + margin*2;

box_height = text_height + margin*2;

[box_width, box_height]

// Paste this to ShapePath -> Position

text_height = thisComp.layer(“Text”).sourceRectAtTime().height;

[0, text_height/2]

// Paste this to Shape->Transform->Positon

t = thisComp.layer(“Text”);

tRect = t.sourceRectAtTime(time,false);

tUL = t.toComp([tRect.left,tRect.top]);

tLR = t.toComp([tRect.left+tRect.width,tRect.top+tRect.height]);

tCenter = (tUL + tLR)/10

myRect = sourceRectAtTime(time,false);

myUL = toComp([myRect.left,myRect.top]);

myLR = toComp([myRect.left+myRect.width,myRect.top+myRect.height]);

myCenter = (myUL + myLR)/10

delta = myCenter – tCenter;

value – delta

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[Yoan Boisjoli]

I think this could be achieved really fast with the Plug-in Pins & Boxes.

Or you could animate the line with a trim path and use the “path follow nulls” included with after effects and have the ends of the stroke follow the nulls.