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<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1"/>
<style>
html, body {
height: 100%;
}
body {
margin: 0;
}
svg {
display: block;
overflow: hidden;
width: 100%;
height: 100%;
}
</style>
<body>
<script src="../../d3.js"></script>
<script>
var color = d3.scale.category10();
var svg = d3.select("body").append("svg");
d3.select("body")
.on("touchstart", touch)
.on("touchmove", touch)
.on("touchend", touch);
function touch() {
d3.event.preventDefault();
var circle = svg.selectAll("circle.touch")
.data(d3.touches(svg.node()), function(d) { return d.identifier; })
.attr("cx", function(d) { return d[0]; })
.attr("cy", function(d) { return d[1]; });
circle.enter().append("circle")
.attr("class", "touch")
.attr("cx", function(d) { return d[0]; })
.attr("cy", function(d) { return d[1]; })
.style("fill", function(d) { return color(d.identifier); })
.attr("r", 1e-6)
.transition()
.duration(500)
.ease("elastic")
.attr("r", 48);
circle.exit()
.attr("class", null)
.transition()
.attr("r", 1e-6)
.remove();
}
</script>
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