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POScaling an arrowhead on a D3 force layout link marker
 

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    <p>I have the following code in a d3 force directed graph where I'm trying to vary the size of the links and their associated arrowheads based on a value (from 1-3). The stroke weight does change with the value but the arrowheads does not stay in the correct position. It tends to shift back from the end when the stroke weight changes from say 1 to a 3. Any ideas on how to keep the arrowheads (markers) properly aligned when changing the stroke value? Many thanks!</p> <pre><code> var link = vis.selectAll("line.link") .data(json.links) .enter().append("svg:line") .attr("class", "link") .style("stroke-width", function(d) { return Math.sqrt(d.value); }) .attr("x1", function(d) { return d.source.x; }) .attr("y1", function(d) { return d.source.y; }) .attr("x2", function(d) { return d.target.x; }) .attr("y2", function(d) { return d.target.y; }) .attr("marker-end", "url(#arrowGray)") .on("click", function(d) { link.style("stroke","#dddddd"); node.style("stroke","#FFFFFF"); d3.select(this).style("stroke","red"); link.attr("marker-end", null); link.attr("marker-end", "url(#arrowGray)"); d3.select(this).attr("marker-end", null); d3.select(this).attr("marker-end", "url(#arrowRed)"); clickLink(d); }); defs.append("svg:marker") .attr("id", "arrowGray") .attr("viewBox","0 0 10 10") .attr("refX","20") .attr("refY","5") .attr("markerUnits","strokeWidth") .attr("markerWidth","9") .attr("markerHeight","5") .attr("orient","auto") .append("svg:path") .attr("d","M 0 0 L 10 5 L 0 10 z") .attr("fill", "#BBBBBB"); </code></pre>
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