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## The Alignment Widget

The alignment widget allows you to place a widget within its window at a position and size relative to the size of the Alignment widget itself. For example, it can be very useful for centering a widget within the window.
There are only two constructors associated with the Alignment widget:

`Alignment(); Alignment(float xalign, float yalign, float xscale = 0.0, float yscale = 0.0);`

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The first constructor creates an empty alignment, the second creates an Alignment with the specified parameters. To alter the parameters of an existing Alignment widget use the Gtk::Alignment::set() method.

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

All four alignment parameters are floating point numbers which can range from 0.0 to 1.0. The xalign and yalign arguments affect the position of the widget placed within the Alignment widget. The xscale and yscale arguments effect the amount of space allocated to the widget.
A child widget can be added to this Alignment widget using Gtk::Container::add():

`alignment->add(*child_widget);`

For an example of using an Alignment widget, refer to the example for the Progress Bar widget.

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