Is there a way to control the zoom in the UI via a script?

[rmcginty]

I may just not be understanding the relationship between the viewbox and the image, but is there a way to basically do a "Zoom Page" (or actually perform that command)?

[spakin]

I've been looking into this, and it appears the answer is "no".

An Inkscape SVG file represents the current zoom within a sodipodi:namedview element's inkscape:zoom attribute, as in the following:

<sodipodi:namedview
   id="base"
   pagecolor="#ffffff"
   bordercolor="#666666"
   borderopacity="1.0"
   inkscape:pageopacity="0.0"
   inkscape:pageshadow="2"
   inkscape:zoom="0.5"
   inkscape:cx="512"
   inkscape:cy="385"
   inkscape:document-units="px"
   inkscape:current-layer="layer1"
   showgrid="false"
   inkscape:window-width="1920"
   inkscape:window-height="1029"
   inkscape:window-x="0"
   inkscape:window-y="0"
   inkscape:window-maximized="1"
   inkscape:document-rotation="0"
   inkscape:showpageshadow="2"
   inkscape:pagecheckerboard="0"
   inkscape:deskcolor="#d1d1d1">
  <inkscape:grid
     type="xygrid"
     id="grid2816"
     empspacing="4"
     visible="false"
     enabled="true"
     snapvisiblegridlinesonly="true"
     spacingx="16"
     spacingy="16"
     originx="0"
     originy="0"
     units="px" />
</sodipodi:namedview>

Although Simple Inkscape Scripting does not currently provide convenient access to named-view elements, a script can use lower-level APIs to access an SVG element's attributes. For example, the current zoom level can be read like this:

nv = svg_root.namedview
zoom = float(nv.get('inkscape:zoom'))

The following code ought to set the zoom, but in fact has no effect:

nv = svg_root.namedview
nv.set('inkscape:zoom', '1.2345')

(Even if that did work, you'd still have to compute the zoom level corresponding to "Zoom Page" in terms of the window and page sizes. There's no automatic sizing that I know of.)

Interestingly, modifying many of the other sodipodi:namedview attributes does work. My hypothesis is that modifications to window-related attributes are overwritten when Simple Inkscape Scripting terminates and Inkscape regains control.

[rmcginty]

Interesting. I was thinking I was just missing something so I'm glad to find out there is more to it than I originally thought! Thanks for the quick response!