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@tomgp
Last active August 2, 2019 07:39
SVG Arrow heads
  1. How to use an external SVG in a D3 visualisation
  2. How to do custom line endings in SVG eg. arrows or turtles
<html>
<head>
<title>SVG Arrows with D3</title>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<link rel="stylesheet" type="text/css" href="http://www.toffeemilkshake.co.uk/tgp-ui-styles/ui-style.css">
<style type="text/css">
.arrow{
stroke-width:5;
stroke:#000;
stroke-dasharray:5, 5;
}
circle{
stroke-width:5;
stroke:#000;
fill:#FFF;
}
#turtle-icon, #arrow{
stroke-width:1;
stroke-dasharray:0;
}
</style>
</head>
<body>
<h1>Arrow heads and turtles in D3</h1>
<div class="viz"></div>
<hr>
<p><a href="http://www.toffeemilkshake.co.uk">Tom Pearson 2014</a></p>
<p>Turtle Icon by Martin Smith from <a href="http://thenounproject.com/">The Noun Project</a></p>
</body>
<script type="text/javascript">
d3.xml('turtle.svg', "image/svg+xml", function(xml){
var importedNode = document.importNode(xml.documentElement, true).getElementsByTagName("g")[0],
height = 500, width = 800,
margin = 50,
type = ['turtle','arrow'];
svg = d3.select(".viz").append("svg")
.attr("width", 800)
.attr("height", 600),
defs = svg.append("defs")
defs.append("marker")
.attr({
"id":"arrow",
"viewBox":"0 -5 10 10",
"refX":5,
"refY":0,
"markerWidth":4,
"markerHeight":4,
"orient":"auto"
})
.append("path")
.attr("d", "M0,-5L10,0L0,5")
.attr("class","arrowHead");
defs.append("marker")
.attr({
"id":"turtle",
"viewBox":"0 0 100 100",
"refX":50,
"refY":50,
"markerWidth":10,
"markerHeight":10,
"orient":"auto"
})
.node().appendChild(importedNode);
d3.range(15).forEach(function(){ //I don't normally do loops like this, just a whim
svg.append('line')
.attr({
"class":"arrow",
"marker-end":"url(#" + type[Math.round(Math.random())] + ")",
"x1":width/2,
"y1":height/2,
"x2":margin + Math.random()*(width-margin*2),
"y2":margin + Math.random()*(height-margin*2)
});
})
svg.append('circle')
.attr({
cx:width/2,cy:height/2,r:20
})
})
</script>
</html>
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