request assistance resizing and centering svg

[ReenigneArcher]

I need to resize and center ~230 svgs, I figured it would be better to automate this, but running into some issues.

This is what I need to do specifically.

1. resize all objects (as if they are one object) in page to a max dimension of 128 (without distorting opposite axis)... scaling the group doesn't seem to work...
2. resize canvas to 128 x 128
3. center new image (all objects) in the canvas

try:
    from simpinkscr import *
except ImportError:
    pass

c = canvas

icon = all_shapes()

# initial resize so we can get the total width and height
c.resize_to_content()

# the final size needs to have one of the dimensions as 128
scale = min(128.0 / c.width, 128.0 / c.height)

for shape in icon:
    shape.scale(
        factor=scale,
    )

canvas.viewbox = (0, 0, 128, 128)

Issues I'm facing

1. The scale operation doesn't seem to work when there are multiple objects

2. The final line is not working as I expect (supposed to resize the "page"?) (this works though Is there a way to resize the backround/paper without also automatically resizing the shapes inside of the svg? #72 (comment))

3. How to align the new image to the center of the page? Replicating the UI commands shown
   

4. How can define the canvas object so my IDE doesn't complain about it? (and can give typing hints)

Any guidance would be appreciated. Thank you!

[ReenigneArcher]

I ended up manually resizing them. So this is not pressing, although I would still like to know how to do this for possible future cases.

[spakin]

Sorry to be unresponsive; I'm on travel all week and not near my Simple Inkscape Scripting development desktop.

My initial thought is to create a group out of all_shapes(), scale the group, rescale the canvas, center the group, and finally ungroup the shapes. Perhaps you can try an approach like that?

[spakin]

To be more specific, see if the following Simple Inkscape Scripting code implements the transformation you had intended:

try:
    from simpinkscr import *
except ImportError:
    pass

c = canvas
icon = group(all_shapes())
bbox = icon.bounding_box()

# the final size needs to have the larger dimension as 128
scale = min(128.0 / bbox.width, 128.0 / bbox.height)
icon.scale(scale)
new_bbox = icon.bounding_box()

# move the icon to the upper-left corner of the canvas
ofs = ((128.0 - new_bbox.width)/2, (128.0 - new_bbox.height)/2)
icon.translate((ofs[0] - new_bbox.left, ofs[1] - new_bbox.top))

# resize the canvas to the icon
c.true_width = 128.0
c.true_height = 128.0
c.viewbox = [0, 0, 128, 128]

# restore the icon's individual shapes
icon.ungroup()