w h parameters do not override for svg and html

[Zaf4]

I was testing the ggsave changes including the to_* methods.

ggsave: the w and h parameters override plot size, allowing to specify the output image size independently of the plot size.

to_pdf, to_png works perfectly as well as their ggsave counterparts.

However,

plot.to_svg("test.svg", w=9,h=3)

raises the following error

TypeError: PlotSpec.to_svg() got an unexpected keyword argument 'w'

while ggsave does not raise any errors (with .html and .svg), it does not resize the plot according to w and h params.

This might be intentional but I think being able to resize the plot while saving —even for svg and html formats— would be a huge quality-of-life improvement.

[alshan]

Hi, in ggsave, w and h are only applicable when exporting to PNG or PDF (see the updated docs: ggsave).
Accordingly, to_svg() doesn't have these parameters.

When exporting to SVG or HTML, the plot size will be as specified in ggsize() or a default.

[alshan]

Hi @Zaf4, looking closer at your request - when you specify w=9, h=3 for SVG export, are you thinking of these as inches or another unit? Is this about supporting multiple size units beyond pixels for SVG export?

[Zaf4]

Hi @alshan, yes I was thinking in terms of inches.

What I had in mind was resizing of the plots prior to exporting just like for PNG and PDF exports.

With PPI of 96, for example, using w=9 and h=3 would be equivalent to using ggsize(864,288) or similar. I may be mistaken about the numbers or the approach but that's the idea.

Would it make sense for to_svg and to_html methods to handle a pre-export resizing? Or would another approach to enable exporting via specifying w,h params be more feasible?

[alshan]

With PPI of 96, for example, using w=9 and h=3 would be equivalent to using ggsize(864,288)

I think we can do SVG in inches in this case: <svg width="9in" height="3in" viewBox="0 0 864 288" ... (assuming 96 PPI screen resolution) if this is what you are looking for.

[IKupriyanov-HORIS]

Fixed in 4.7.1

[IKupriyanov-HORIS]

Please note that this fix only applies to SVG export. The HTML export issue will be addressed later.

Generally speaking, HTML only supports pixel dimensions, not DPI or physical sizes. Therefore, HTML export will only support the w and h parameters.
As a workaround, the ggsize() function can be used directly within the ggsave() function.
ggsave(p + ggsize(800, 800), 'plot.html')