Expand Linked Path Sizes.expr

// Get the path from the source layer
var sourcePath = mask("Mask 1").maskPath;

// Define the expansion amounts for width and height
var expandWidth = 20; // Expand width by 20 pixels
var expandHeight = 20; // Expand height by 20 pixels

// Get the points, inTangents, and outTangents of the original path
var points = sourcePath.points();
var inTangents = sourcePath.inTangents();
var outTangents = sourcePath.outTangents();
var isClosed = sourcePath.isClosed();

// Calculate the center of the path by averaging the points
var sumX = 0;
var sumY = 0;
for (var i = 0; i < points.length; i++) {
    sumX += points[i][0];
    sumY += points[i][1];
}
var centerX = sumX / points.length;
var centerY = sumY / points.length;
var center = [centerX, centerY];

// Expand the points by scaling them away from the center
var expandedPoints = points.map(function(pt) {
    var offsetX = pt[0] - center[0];
    var offsetY = pt[1] - center[1];
    var scaledX = offsetX > 0 ? offsetX + expandWidth : offsetX - expandWidth;
    var scaledY = offsetY > 0 ? offsetY + expandHeight : offsetY - expandHeight;
    return [center[0] + scaledX, center[1] + scaledY];
});

// Create the new path with expanded points, same tangents, and closure
createPath(expandedPoints, inTangents, outTangents, isClosed);