Adobe After Effects CS3 Manuel d'utilisateur télécharger pdf (Page 558)

AFTER EFFECTS CS3

User Guide

553

See also

“Work with the Graph Editor” on page 184

“Creating and modifying motion paths” on page 197

Writing expressions for source text

The Source Text property of a text layer is interpreted by expressions as a JavaScript String. You can use the pick whip

toretrievethesourcetextfromanothertextlayer;however,onlythestyleofthefirstcharacterofthedestinationlayer

is used.

For more information on the String object, consult a JavaScript guide.

You can use

"\r" in a string expression to start a new line of text. For example, to copy the original text from one

layer onto the same layer and repeat it in all uppercase characters on a new line, use the following expression:

text.sourceText + "\r" + text.sourceText.toUpperCase()

Adding a text layer to a composition and adding an expression to its Source Text property can be a great way to

examine the property values of other layers. For example, the following expression on a Source Text property reports

the name and value of the Opacity property for the next layer in the layer stacking order:

thisComp.layer(index + 1).name + "\rOpacity = " + thisComp.layer(index + 1).opacity.value

The following example reports the name of the footage item used as the source of the topmost image layer in the

stacking order at the current time that has its Video switch set.

source_footage_name = "";

for (i = 1; i <= thisComp.numLayers; i++){

if (i == index) continue;

my_layer = thisComp.layer(i);

if (! (my_layer.hasVideo && my_layer.active)) continue;

if (time >= my_layer.inPoint && time < my_layer.outPoint){

try{

source_footage_name = my_layer.source.name;

}catch(err1){

source_footage_name = my_layer.name

}

break;

}

}

source_footage_name

See also

“Creating and editing text layers” on page 273

Add comments to an expression

If you write a complex expression and intend to reuse it later, you should add comments that explain what the

expression does and how its pieces work.

• Type // at the beginning of the comment. Any text between // and the end of the line is ignored. For example:

// This is a comment.

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Avenue 17 24 Apr 2024 | 16:19:09

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