GooCanvasImageModel represent a model for image items.
<note><para> It is usually necessary to set the "scale-to-fit" property to true to scale
the image to fit the given rectangle. When using units other than gtk_unit_pixel it is also necessary to
set the "width" and "height" properties to set the desired size. </para></note>
It is a subclass of CanvasItemModelSimple and so inherits all of the style
properties such as "operator" and "pointer-events".
To get or set the properties of an existing CanvasImageModel, use @get and
@set.
To respond to events such as mouse clicks on the image you must connect to the signal handlers of the corresponding
CanvasImage objects. (See get_item
and item_created.)