Re: [Inkscape-user] vector-effect: non-scaling stroke

Hi Tav, (et al)

Thanks for the explanation, that’s clear.

So, in Inkscape, I selected all the lines, set their width to 1px and saved the file again.

When I examine the file, it has the line-thickness saved in the style-attribute of the path:

style="stroke-width:0.02822223;…

Now I wonder, where does this 0.02822 come from? What calculation is made?

Thanks,

Maarten

On 04 Jul 2015, at 20:51, Tavmjong Bah <tavmjong@...206...> wrote:

On Sat, 2015-07-04 at 19:55 +0200, m .h. van der velde wrote:

...

Hi Judah, et al,

Thanks for your help and the screenshots. it’s very interesting, i never made the connection in my mind between the ‘custom size’ in the properties window and the viewbox-attribute in SVG, neither between the ‘scale strokes’ button in the Inkscape UI and the effect from SVG definition.

But, toggling the ‘transform strokes’ button doesn’t do anything.

I suddenly wonder,… I define the line style in a stylesheet in the head of document. Might it be that Inkscape doesn’t like that?

Also, this is my SVG definition:

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="30cm" height="60cm" viewBox="0 0 30 60" > and Inkscape’s document setting

And the style, together with the first path. <![CDATA[

       .cut{ stroke: #ff0000; stroke-width: 1px; fill: none; }

       .fold{ stroke: #08C; stroke-width: 1px; fill: none; stroke-dasharray:2, 2 }

       .valley{ stroke: #00cccc; stroke-width: 1px; fill: none; stroke-dasharray:3, 2 }

       .mountain{ stroke: teal; stroke-width: 1px; fill: none; stroke-dasharray:2, 3 }

       .construction{ stroke: silver; stroke-width: 1px; fill: none; stroke-dasharray:10,3 }

     ]]>
     </style>

       <path id="outside" class="cut" vector-effect="non-scaling-stroke" d="M 0 0

Thanks for your help, I suspect it’s a bug in my SVG, rather then a bug in Inkscape.

The combination of the 'width'/'height' and 'viewBox' define the initial "user unit" in SVG which is equivalent to '1 cm' in "real world" units according to the information in the <svg> element. I won't go into the long, twisted history of SVG and CSS but internally "px" is defined to be mean one "user unit". Thus, your <style> element is defining the stroke widths to be 1 cm wide in "real world" units.

The 'vector-effects' property was added in the SVG 2 specification (which is yet to be finished). It is not yet supported in Inkscape.

Tav

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