Very simple example of using D3 transitions to move some circles and change their colors
<!DOCTYPE html>
<meta charset="utf-8">
<style>
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var data = [2,4,3];
var width = 800;
var height = 500;
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
svg.selectAll("circle")
.data(data)
.enter().append("circle")
.attr("r", function(d) { return 5 * d; })
.attr("fill", "red")
.attr("cx", 40)
.attr("cy", height / 2);
svg.selectAll("circle")
.transition()
.duration(750)
.delay(500)
.attr("fill", "green")
.attr("cx", 500)
.attr("cy", function(d, i) { return 100 * (i + 1); });
</script>