Re: How to determine total size of group of images

[Damon Chaplin <damonachaplin gmail com>]

On Tue, 2017-08-22 at 22:07 +0200, Fred van Zwieten wrote:
> Hi,
>
>
> I am experimenting with GooCanvas in pygobject.
>
>
> I want to be able to do operations on a selection of images on a
> canvas. I want to draw a border around the group of images with
> handles for resizing, scaling and rotating (a bit like libreoffice
> draw does that, or Google Diagram).
>
>
> I am having some difficulty on how to do this. When I add the images
> to a CanvasGroup I can operate resizing, scaling and rotating on the
> group as a whole. However, to be able to draw a border around the
> group of images, I need to know the total size of the group. I was
> hoping the height en width properties of the CanvasGrop would provide
> for them automagically, but they stay on -1.0.
>
>
> Is there an easy way to get the x, y, height, width of the images
> within the group.

There is a goo_canvas_item_get_bounds() function, which should also work
on groups, I think.

Otherwise you'll have to iterate over the items in the group with
goo_canvas_item_get_child() and combine the x/y/width/height or bounds.

Damon