Returns an array containing the alignment values for the widget within
its allocation. The first element of the array is the
x alignment and the second element is the
Alignment values are represented as a percentage of the parent's height
or width. For example, an x alignment of
.5 aligns the 50% of the width from
the left of the parent widget. A value of 1 aligns the
widget as far to the right as possible.
The default for both alignment values is .5.