Inverting an ellipse???

Question

Hi,
i have some code that creates an ellipse to the size of my comp, now i just want to tweak some attributes of the ellipse, like inverting it (to create a vignette) and then bluring it.
this is the code so far:
var myComp = app.project.activeItem;
var myEllipseSize = [1920,1080];
var myFillColor = [0.0, 0.0, 0.0];
var myShapeLayer = myComp.layers.addShape();
var myShapeLayerContents = myShapeLayer.property("ADBE Root Vectors Group");
var myShapeGroup = myShapeLayerContents.addProperty("ADBE Vector Group");
var myEllipse = myShapeGroup.property("ADBE Vectors Group").addProperty("ADBE Vector Shape - Ellipse");
myEllipse.property("ADBE Vector Ellipse Size").setValue(myEllipseSize);
var myShapeFill = myShapeGroup.property("ADBE Vectors Group").addProperty("ADBE Vector Graphic - Fill");
myShapeFill.property("ADBE Vector Fill Color").setValue(myFillColor);
does anyone know how to now invert and blur this shape?
thanks,
Sam

Answer 1

I'd be inclined to do it with a solid and an elliptical mask, like this:
var myComp = app.project.activeItem;
var w = myComp.width;
var h = myComp.height;
var ratio = .5523;
var hTan = ratio*w/2;
var vTan = ratio*h/2;
var mySolid = myComp.layers.addSolid([0,0,0], "vignette", w, h, 1);
var newMask = mySolid.Masks.addProperty("ADBE Mask Atom");
newMask.maskMode = MaskMode.SUBTRACT;
var myProperty = newMask.property("ADBE Mask Shape");
var myShape = myProperty.value;
myShape.vertices = [[w/2,0],[0,h/2],[w/2,h],[w,h/2]];
myShape.inTangents = [[hTan,0],[0,-vTan],[-hTan,0],[0,vTan]];
myShape.outTangents = [[-hTan,0],[0,vTan],[hTan,0],[0,-vTan]];
myShape.closed = true;
myProperty.setValue(myShape);
var myBlur = mySolid.property("Effects").addProperty("Fast Blur");
myBlur.property("Blurriness").setValue(25);
myBlur.property("Repeat Edge Pixels").setValue(true);
Dan