loadSVGFromString cannot show defs

[lzruio]

I tried to import an SVG using Fabric.js, and while the elements in the SVG are displayed, the RectStartArrow_ defined in the is not displayed correctly. How can I solve this problem? Below is a simple example of my code.

import * as fabric from 'fabric'

const canvas = new fabric.Canvas('myCanvas');

const svgString = <svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"> <defs> <marker id="RectStartArrow_" refX="5" refY="6" orient="auto" markerWidth="10" markerHeight="10"> <path d="M5 0 L5 6 L5 12 L5 6 L2 12 L8 0" fill="red" /> </marker> <marker id="RectEndArrow_" refX="5" refY="6" orient="auto" markerWidth="10" markerHeight="10"> <path d="M5 0 L5 6 L5 12 L5 6 L8 12 L2 0" fill="red" /> </marker> </defs> <line x1="10" y1="10" x2="190" y2="10" stroke="#000" strokeWidth="2" markerStart="url(#RectStartArrow_)" markerEnd="url(#RectEndArrow_)" /> </svg>;

async function loadSvg(dataText) {
if (!dataText) {
return;
}

const { objects, options } = await fabric.loadSVGFromString(dataText);

const group = fabric.util.groupSVGElements(objects, options);

// 添加到 Canvas
canvas.add(group);
canvas.renderAll();

}

loadSvg(svgString);

[asturur]

I do not think we support markerEnd and markerStart. What are those? do you have reference to SVG specs that talk about those?

[lzruio]

They are reusable elements defined in the section of the SVG. Then we can reference these elements repeatedly in the line, and they will be displayed on the line.
If Fabric.js does not support these referenced elements, should I replace all the referenced elements with the actual paths?

[asturur]

No.
You should find the specs for markerEnd and the others marker and let's see if we can support them

[mischahaller]

Hello,
you can find the marker-start specification here: https://svgwg.org/svg2-draft/painting.html#MarkerStartProperty
It is very useful for displaying dimensions in technical drawings.
Do you think you could add support for this specification in fabric.js?
We could provide financial support for the development.

Regards
Mischa

[asturur]

Do you have a real example svg?

[mischahaller]

Hello,
yes i have!

[mischahaller]

another one as attachment

[asturur]

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-393.38 l -51 0 Z"/><line class="bemassung_l" marker-end="url(#pf2)" marker-start="url(#pf1)" stroke="black" stroke-width="0,5" x1="511.7" y1="565.08" x2="511.7" y2="171.7"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="477.7" y1="565.08" x2="528.7" y2="565.08"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="528.7" y1="171.7" x2="477.7" y2="171.7"/><text class="fig_C74752FF-5ECF-4D28-A300-AAFC7D5FB7C0 bemassungstext" text-anchor="middle" transform="rotate(-90 503 368)" x="503" y="368">1157 mm</text><path class="bemassung subFigureArt_bemassungs-figur " id="{92F04880-C63A-4F36-A883-5DF3AEE42D31}" fill="none" fill-opacity="1" stroke="black" stroke-width="0" d="M 477.7 102 l 0 69.7 l 51 0 l 0 -69.7 l -51 0 Z"/><line class="bemassung_l" marker-end="url(#pf2)" marker-start="url(#pf1)" stroke="black" stroke-width="0,5" x1="511.7" y1="171.7" x2="511.7" y2="102"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="477.7" y1="171.7" x2="528.7" y2="171.7"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="528.7" y1="102" x2="477.7" y2="102"/><text class="fig_92F04880-C63A-4F36-A883-5DF3AEE42D31 bemassungstext" text-anchor="middle" transform="rotate(-90 503 137)" x="503" y="137">205</text><path class="bemassung subFigureArt_bemassungs-system-rahmen " id="{F0DDBC1A-87C3-40F3-BF28-2D3B57AF0884}" fill="none" fill-opacity="1" stroke="black" stroke-width="0" d="M 477.7 102 l 121.56 0 l 0 472.6 l -121.56 0 l 0 -472.6 Z"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="477.7" y1="102" x2="599.264" y2="102"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="599.264" y1="574.6" x2="477.7" y2="574.6"/><path class="bemassung subFigureArt_bemassungs-figur " id="{06A48891-212E-4903-8C9C-CFCC46E8F4CA}" fill="none" fill-opacity="1" stroke="black" stroke-width="0" d="M 548.26 102 l 0 472.6 l 51 0 l 0 -472.6 l -51 0 Z"/><line class="bemassung_l" marker-end="url(#pf2)" marker-start="url(#pf1)" stroke="black" stroke-width="0,5" x1="582.264" y1="574.6" x2="582.264" y2="102"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="548.264" y1="574.6" x2="599.264" y2="574.6"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="599.264" y1="102" x2="548.264" y2="102"/><text class="fig_06A48891-212E-4903-8C9C-CFCC46E8F4CA bemassungstext" text-anchor="middle" transform="rotate(-90 573 338)" x="573" y="338">1390 mm</text><path class="bemassung subFigureArt_bemassungs-system-rahmen " id="{28D4CF9F-22B1-409E-B36B-A258AF91B4AF}" fill="none" fill-opacity="1" stroke="black" stroke-width="0" d="M 460.7 591.6 l 0 51 l -358.7 0 l 0 -51 l 358.7 0 Z"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="460.7" y1="591.6" x2="460.7" y2="642.6"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="102" y1="642.6" x2="102" y2="591.6"/><path class="bemassung subFigureArt_bemassungs-figur " id="{1FCA523C-652F-41FD-8AEA-5104D6428CB1}" fill="none" fill-opacity="1" stroke="black" stroke-width="0" d="M 460.7 591.6 l -358.7 0 l 0 51 l 358.7 0 l 0 -51 Z"/><line class="bemassung_l" marker-end="url(#pf2)" marker-start="url(#pf1)" stroke="black" stroke-width="0,5" x1="102" y1="625.6" x2="460.7" y2="625.6"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="102" y1="591.6" x2="102" y2="642.6"/><line class="bemassung_hl" stroke="black" stroke-width="0,5" x1="460.7" y1="642.6" x2="460.7" y2="591.6"/><text class="fig_1FCA523C-652F-41FD-8AEA-5104D6428CB1 bemassungstext" text-anchor="middle" x="281" y="616">1055 mm</text><text class="fig_64F820F1-B12F-4A12-94A8-7D1411F2662A" style="font-family: Arial; font-size: 2em; font-style: normal; font-weight: normal;" fill="#a9a9a9" text-anchor="middle" x="281" y="368" font-decoration="none">F 1.1</text><text class="fig_2E72D0DC-6C6D-4331-B9A0-1BBD15A7004C" style="font-family: Arial; font-size: 2em; font-style: normal; font-weight: normal;" fill="black" text-anchor="start" x="107" y="167" font-decoration="none">Rollladen</text><path class="marker_huellen-figur" id="{B6946B8D-0573-4A02-AE43-612C82CFBF3C}" fill="none" stroke="transparent" stroke-width="10" d="M 102 102 l 358.7 0 l 0 472.6 l -358.7 0 l 0 -472.6 Z"/><path class="marker_doppel-parallel-linie" id="{AC2E6819-E665-47A1-BACE-248C32DA56EF}" fill="none" stroke="transparent" stroke-width="10" d="M 115.6 185.3 l 331.5 0 l 0 366.18 l -331.5 0 l 0 -366.18 Z"/></svg>

[asturur]

I don't think it would be hard to display them, the issue is that these would be just extra objects on the line, they wouldn't be "part of the line"

[mischahaller]

That wouldn't be a problem for me. At the moment, the lines aren't drawn at all. So it would already be an improvement if at least the lines were converted. Here is a screenshot of what the import looks like at the moment.

[asturur]

oh that is weird, i would expect the lines to show but not the arrow marks.
I need to complete the 7.0 release, then i can look into this