Hi Hans, I've been using the SVG->MP converter and I've found a few bugs. Most of the bugs are with "weird" SVG input, but I have no control over the input, and the metadata on most of the files shows that it was exported from Adobe Illustrator which is (unfortunately) quite popular. I've tested all of the below with the latest ConTeXt.
If you give Metapost an out-of-order gradient, it produces an invalid PDF. Both pages in this example: \startbuffer[gradient] <svg viewBox="0 0 200 100" xmlns="http://www.w3.org/2000/svg";> <defs> <linearGradient id="gradient" x1="0%" y1="0%" x2="0" y2="100%"> <stop offset="0%" style="stop-color:green;" /> <stop offset="75%" style="stop-color:green;" /> <stop offset="25%" style="stop-color:blue;" /> <stop offset="100%" style="stop-color:blue;" /> </linearGradient> </defs> <rect x="0" y="0" width="100%" height="100%" fill="url(#gradient)" /> </svg> \stopbuffer \starttext \startTEXpage \includesvgbuffer[gradient] \stopTEXpage \startMPpage fill unitsquare xyscaled (200,100) withshademethod "linear" withshadecenteronefraction (0,1) withshadecentertwofraction (0,0) withshadestep ( withshadefraction 0 withshadecolors (green, green) ) withshadestep ( withshadefraction 0.75 withshadecolors (blue, green) ) withshadestep ( withshadefraction 0.25 withshadecolors (green, blue) ) withshadestep ( withshadefraction 1 withshadecolors (green, blue) ) ; \stopMPpage \stoptext write this to the PDF /Bounds [ 0 0.75 0.25 ] which is invalid and renders incorrectly in every PDF reader that I've tested. This is what the SVG 1.1 spec has to say: Each gradient offset value is required to be equal to or greater than the previous gradient stop's offset value. If a given gradient stop's offset value is not equal to or greater than all previous offset values, then the offset value is adjusted to be equal to the largest of all previous offset values. The following SVG renders incorrectly, but replacing the 0% stop with the commented one fixes it: <svg viewBox="0 0 200 100" xmlns="http://www.w3.org/2000/svg";> <defs> <linearGradient id="gradient" x1="0%" y1="0%" x2="0" y2="100%"> <stop offset="0%" style="stop-color:#FFFFFF;" /> <!--<stop offset="0%" style="stop-color:#FEFFFF;" />--> <stop offset="100%" style="stop-color:blue;" /> </linearGradient> </defs> <rect x="0" y="0" width="100%" height="100%" fill="url(#gradient)" /> </svg> Using a gradient as the stroke colour outputs an invalid colour to MetaPost. This example: \startbuffer[gradient] <svg viewBox="0 0 200 100" xmlns="http://www.w3.org/2000/svg";> <defs> <linearGradient id="gradient" x1="0%" y1="0%" x2="0" y2="100%"> <stop offset="0%" style="stop-color:green;" /> <stop offset="100%" style="stop-color:blue;" /> </linearGradient> </defs> <rect x="0" y="0" width="100%" height="100%" stroke="url(#gradient)" /> </svg> \stopbuffer \startluacode print(metapost.svgtomp{data = buffers.getcontent("gradient")}) \stopluacode gives this output: [...] withcolor "url(#gradient)" [...] "stop-opacity" seems to be ignored: \startbuffer[gradient] <svg viewBox="0 0 200 100" xmlns="http://www.w3.org/2000/svg";> <defs> <linearGradient id="gradient" x1="0%" y1="0%" x2="0" y2="100%"> <stop offset="0%" style="stop-color:red;" stop-opacity="1" /> <stop offset="100%" style="stop-color:red;" stop-opacity="0" /> </linearGradient> </defs> <rect x="0" y="0" width="100%" height="100%" fill="url(#gradient)" /> </svg> \stopbuffer \startTEXpage \includesvgbuffer[gradient] \stopTEXpage Finally, "display:none;" doesn't work: \startbuffer[gradient] <svg viewBox="0 0 200 100" xmlns="http://www.w3.org/2000/svg";> <rect x="0" y="0" width="100%" height="100%" fill="black" style="display:none;" /> </svg> \stopbuffer \startTEXpage \includesvgbuffer[gradient] \stopTEXpage Thanks, -- Max ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___________________________________________________________________________________
