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Use script to retrieve value from expression
Hello,
I’m trying to create a script that will resize my comp according to a value retrieved from an expression within the comp. First of all, is this even at all possible? If so, I would love some assistance on how this would be done, or pointers to any relevant resources.
Many thanks in advance!
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8 Replies
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Here’s a simple example that gets the comp width from a slider control that has an expression:
var myComp = app.project.activeItem;
var myWidth = myComp.layer(1).property("Effects").property("Slider Control").property("Slider").valueAtTime(0,false);
myComp.width = myWidth;
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Wow, this was exactly what I was looking for, and I thought it would be much more complicated. Thank you so much!
While I have you, another possibly more difficult obstacle: would it be possible to create a solution for scaling font size with say comp width?
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You can do it dynamically with an expression on scale:
compWidth = thisComp.width;
compHeight = thisComp.height;
ratioX = value[0]/1920; //replace 1920 with your original comp width
ratioY = value[1]/1080; //replace 1920 with your original comp height
newSizeX = compWidth*ratioX;
newSizeY = compHeight*ratioY;
[newSizeX,newSizeY];
You’ll need to script out the position as well if you want the text to stick in place, or have your anchor point in the center of the comp.
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Apologies for the late reply.
This solution was much more elegant than the one I came up with at first, and seems to be working perfectly together with my positioning expressions. Thank you too!
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Hey Dan, silly question here. How do you reply with your code in a separate box? I’ve noticed the forum font does some bad things when I paste replies directly in the reply box.
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Once you start entering text, you can click on the Aa below to expose text formatting options. Move to a new line and click the </> for preformatted text and paste your expression in the box. What I haven’t figured out is how to keep it from double spacing the lines. Maybe someone will reveal that trick…
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great, thank you!
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I’ve tried adding a function to the script, but this is a bit above my level so I just wanted to ask for a little more help.
I would like the script to check for precomps with a specific name and then resize that comp to the same size as the main comp. So, let’s say, if the main comp contains a precomp named “one” and/or “two”, resize them. If they don’t exist, then do nothing.
I understand this might be a little complicated, so any pointers in the right direction are appreciated. Thanks!
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