sprockets/src/main/java/net/sf/sprockets/view/Reveals.java
public static Animator circleFromRect(View circle, View rect) {
        return circleRect(circle, rect, false);
    }
public static Animator circleFromRect(View circle, View rect) {
        return circleRect(circle, rect, false);
    }
Get an Animator that "unreveals" the rectangular View to the circular View.

@param circle to end "unreveal" at
@param rect   to "unreveal", will be {@link View#INVISIBLE invisible} when the animation
ends