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jfost00/README.md

Created February 28, 2016 07:12
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Follow the Mouse
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index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<style>
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
svg { width:100%; height: 100% }
</style>
</head>
<body>
<script>
var width = 800, height = 500;
var stripWidth = 20, stripCount = 0;
var radius = 30, moveCount = 0, index = 0;
var factor = 0, factors = [1.0, 0.5];
var circleColors = ["#467864", "#C45F4B", "#86C4AC", "#5FC49C", "#784E46"];
var svg = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height);
svg.on("mousemove", function() {
index = (++moveCount) % circleColors.length;
stripCount = Math.floor(moveCount/stripWidth);
factor = factors[stripCount%2];
var circle = svg.append("circle")
.attr("cx", d3.event.pageX)
.attr("cy", d3.event.pageY)
.attr("r", radius*factor);
circle.attr("fill", circleColors[index]);
})
</script>
</body>
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