DoubleTab and zoom about gestouch HOT 3 CLOSED

scaleAroundGlobalPoint(_container, gesture.location, /*scale:*/ 2);

function scaleAroundGlobalPoint(obj:DisplayObject, point:Point, scale:Number):void
{
    const matrix:Matrix = obj.transform.matrix;
    const transformPoint:Point = matrix.transformPoint(obj.globalToLocal(point));
    matrix.translate(-transformPoint.x, -transformPoint.y);
    matrix.scale(scale, scale);
    matrix.translate(transformPoint.x, transformPoint.y);

    obj.transform.matrix = matrix;
}