score:0
have a look at marker-end attribute, which will automatically append defined marker, and also orient it the right way if the marker has orient
attribute set as auto.
<!doctype html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>
body {
margin: 0;
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
}
</style>
</head>
<body>
<script>
// feel free to change or delete any of the code you see in this editor!
var svg = d3.select("body").append("svg")
.attr("width", 300)
.attr("height", 100);
svg.append('defs').append('marker')
.attr('id', 'arrow')
.attr('viewbox', '0 0 10 6')
.attr('refx', 10)
.attr('refy', 3)
.attr('markerwidth', 10)
.attr('markerheight', 6)
.attr('markerunits', 'userspaceonuse')
.attr('orient', 'auto')
.append('path')
.attr('d', 'm 0 0 l 10 3 l 0 6 z');
svg.append('g')
.attr('transform', 'translate(10,10)')
.selectall('path')
.data(d3.range(4))
.enter()
.append('path')
.style('stroke', 'black')
.style('fill', 'none')
.attr('marker-end', 'url(#arrow)')
.attr('d', function(d, i) {
return 'm 0 0 l 50 ' + i * 20;
})
</script>
</body>
Source: stackoverflow.com
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