Alignment.set

void set(float xalign, float yalign, float xscale, float yscale)

Sets the #GtkAlignment values.

`xalign`	the horizontal alignment of the child widget, from 0 (left) to 1 (right).
`yalign`	the vertical alignment of the child widget, from 0 (top) to 1 (bottom).
`xscale`	the amount that the child widget expands horizontally to fill up unused space, from 0 to 1. A value of 0 indicates that the child widget should never expand. A value of 1 indicates that the child widget will expand to fill all of the space allocated for the #GtkAlignment.
`yscale`	the amount that the child widget expands vertically to fill up unused space, from 0 to 1. The values are similar to xscale.

Use #GtkWidget alignment and margin properties