On Tue, May 14, 2013 at 11:19 AM, Jan Gerber <jger...@wikimedia.org> wrote:
> for the Score extension it would be nice to output SVG images, the SVG > images produced by lilypond have lots of white space (it outputs paper > sheets), covert can give the outer bound and offset of the area we want to > display: > > I.e. for http://upload.wikimedia.org/wikipedia/test2/d/d5/ScoreSVGTest.svg > > $ convert ScoreSVGTest.svg -trim info:- > ScoreSVGTest.svg SVG 434x267 744x1052+27+23 16-bit DirectClass 0.010u > 0:00.009 > Handy that you can get trim info out of convert, that's probably easier than using an XML parser and trying to understand all the paths and transformations manually. :) > If SVG is scaled to 744x1052, we want to crop it to 434x267 starting at > (27, 23) > > Does anyone know how to translate this into the width/height/viewBox > properties in SVG? > So, there's two things you probably want to modify: * the width and height attributes on the <svg> element * the viewBox attribute on the <svg> element On the sample file you'll see them like this: <svg ... width="210.00mm" height="297.00mm" viewBox="0 0 119.5016 169.0094"> The 'width' and 'height' attributes set the default physical size of the image, in this case an A4 sheet of paper. Note that these apparently can include units; if units are unspecified I think they default to CSS pixels. Yay! The 'viewBox' attribute lists the *internal* coordinate space that fits in that physical box, as "origin-x origin-y width height" Unfortunately it's not the same units as the physical width/height here, but luckily the initial origin is at 0,0 in these, so it makes the math simpler. ;) You should be able to scale your target coordinates from ImageMagick's pixel counts into both the physical size and internal coordinate spaces, then set the width/height and viewBox attributes to match. -- brion _______________________________________________ Wikitech-l mailing list Wikitech-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikitech-l
