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I've got SVG code that aligns properly if I write the SVG into the html document, and then view the document:
<html>
<head>
<script type="text/javascript" src="jquery-1.12.2.min.js"></script>
<script type="text/javascript" src="script.js"></script>
<link rel="stylesheet" href="style.css" />
</head>
<body>
<div id="stage">
<svg width="100" height="100">
<defs>
<marker id="arrow-1" markerWidth="4" markerHeight="3" markerUnits="strokeWidth" refx="1" refy="5" viewBox="0 0 10 10" orient="auto">
<path d="M 0 0 L 10 5 L 0 10 z" fill="context-stroke"></path>
</marker>
</defs>
<path d="M 0,10 L 90,10" stroke-width="2" stroke="red" marker-end="url(#arrow-1)"></path>
</svg>
</div>
</body>
</html>
This works great, and renders this:
Notice that in the working output, the marker-end is properly aligned with the stroke
I then try to produce the exact same SVG structure with JavaScript:
var arrowID = 0;
function drawArrow() {
var ns = 'http://www.w3.org/2000/svg';
var svg = document.createElementNS(ns, 'svg');
svg.setAttribute("width",100);
svg.setAttribute("height",100);
var defs = document.createElementNS(ns, "defs");
var marker = document.createElementNS(ns, "marker");
var id = "arrow-" + arrowID++;
marker.setAttribute("id", id);
marker.setAttribute("markerWidth", 4);
marker.setAttribute("markerHeight", 3);
marker.setAttribute("markerUnits", "strokeWidth");
marker.setAttribute("refx", 1);
marker.setAttribute("refy", 5);
marker.setAttribute("viewBox", "0 0 10 10");
marker.setAttribute("orient", "auto");
var path = document.createElementNS(ns, "path");
path.setAttribute("d","M 0 0 L 10 5 L 0 10 z");
path.setAttribute("fill","context-stroke");
marker.appendChild(path);
defs.appendChild(marker);
svg.appendChild(defs);
var instance = document.createElementNS(ns, "path");
// todo set actual start and end
instance.setAttribute("d", "M 0,10 L 90,10");
instance.setAttribute("stroke-width", "2");
instance.setAttribute("stroke", "red");
instance.setAttribute("marker-end", "url(#"+id+")");
svg.appendChild(instance);
document.getElementById("stage").appendChild(svg);
}
Even though the SVG that ends up on the page is correct (identical to what is above):
The rendered SVG is wrong, and looks like this:
Notice that in the failed output, the marker-end is not aligned properly with the stroke.
What is missing from the JavaScript code that is present in the hard-coded HTML rendering? Why does the JavaScript render a mis-aligned marker end?
Here's everything in a fiddle: fiddle
635
SVG is case sensitive. The correct attribute names are refX and refY.
117
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