Shape & Mask

General tips

Maintain stroke width

// from campkeyframe
sf = transform.scale[0]/100;
 ov = value;
nv = ov / sf

// for parented shapes 
value / length(toComp([0,0]), toComp([0.7071,0.7071])) || 0.001;


// https://battleaxe.tumblr.com/post/101945073972/maintain-stroke-weight-expression

Looping paths (loopOut() doesn't work for paths)

Pingpong

if (numKeys >1 && time > key(numKeys).time){
 t1 = key(1).time;
 t2 = key(numKeys).time;
 span = t2 - t1;
 delta = time - t2;
 seg = Math.floor(delta/span);
 t = delta%span;
 valueAtTime((seg%2) ? (t1 + t) : (t2 - t));
}else
 value

cycle

if (numKeys >1 && time > key(numKeys).time){
 t1 = key(1).time;
 t2 = key(numKeys).time;
 span = t2 - t1;
 delta = time - t2;
 t = delta%span;
 valueAtTime(t1 + t)
}else
 value

Accessing Shape parameters

Reference: https://ae-expressions.docsforadobe.dev/group.html?highlight=shape%20property#group

Syntax & Usage

thisProperty.propertyGroup(1).numProperties
thisProperty.propertyGroup(1).propertyIndex

Shape Property Index

Let's say if you have multiple Ellipses or other shapes within a Shape Layer Contents, and you want to retrieve the index of each Shape:

content("Ellipse 1").propertyIndex

thisProperty.propertyGroup(3).propertyIndex

If you want to use parse the index via the property name:

// using name as index eg. line_1
parseInt(thisProperty.propertyGroup(3).name.split("_")[1]); // method 1

parseInt(content(1).name.split("_")[1]) // method 2

Shape Property Group and Index

// shape group index
thisProperty.propertyGroup(2).propertyIndex // change num accordingly

Examples

• Property Group Index Expression + Free Preset