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Extracting X values from a path.
Hi,
I know you can copy the path from a shape layer into the position value of another layer and you’ll get keyframes with a two field array values (x and y position). Is there a way to extract this information from the path itself without copy/pasting? Meaning, can I write an expression that will feed the x value of a path, for example, directly into another layer’s x position field?
Basically, I am creating a graph that shows changing value (a simple line graph similar to a sine wave) and I’m moving this graph from left to right. I’d like another layer to keep a constant x value but have the y value follow the contours of the graph as it moves. I’m trying to avoid copy/pasting the values because I’d like to be able to change the path and still have the second layer follow the new contour.
Is this possible?
Thanks in advance for the help!-Josh
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3 Replies
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I can’t think of a way to do that.
Dan
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you could do the opposite…
have the moving layer draw the path. then you’d be updating the y position keyframes of the layer and the path would then update.
there are a couple ways to get the path to draw on. if you have particular, you could link the emitter to the keyframed layer and use wind to generate the x movement of the particles.
or you could use the write-on effect using expressions to link the y position of the ‘brush’ to the keyframed layer and the x position to the x position of the write-on layer (you’ll want it to move left as the line writes on). the x-pos expression will need to account for layer and comp width, so it will take a little tweaking… also the layer will be moving left but the line will write on to the right, so it will need to account for that too.
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW -
Thanks for your help!
I’ll try the write-on idea.-Josh
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