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average.html
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average.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Average</title>
<link rel="stylesheet" type="text/css" href="style.css">
<style type="text/css">
svg{
display:block;
}
</style>
</head>
<body>
<h1>Average %12</h1>
<script src="bower_components/d3/d3.js"></script>
<script type="text/javascript">
var width = 300,
height = 300;
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var g = svg.append('g')
.attr('fill', 'green')
.attr('transform', 'translate(' + width/2 + ', ' + height/2 + ')');
var r = 50,
o = (Math.PI*2)/12,
x = function(value){
return Math.cos(value * o) * r
},
y = function(value){
return -Math.sin(value * o) * r
};
var values = [9, 1, 9.5, 0.5, 0.4, 0.2, 5, 9.4, 9.9, 0, 10, 10.2],
modulus = 10;
// map {0 -> modulus}* to 0 -> 1
var angles = values.map(function(v){
return (v % modulus) / modulus
})
console.log(angles);
// convert to unit vectors
var vectors = angles.map(function(a){
return {
x: Math.cos(a * Math.PI * 2),
y: - Math.sin(a * Math.PI * 2)
}
})
console.log(vectors)
// find the average angle by summing unit vectors
var sum = vectors.reduce(function(memo, vector){
memo.x += vector.x/vectors.length;
memo.y += vector.y/vectors.length;
return memo;
},{x:0,y:0})
console.log(sum);
var a = Math.atan2(sum.x, sum.y);
if(a < 0){
a += Math.PI*2;
a = a % Math.PI*2;
}
a = a + (Math.PI/4)
a = a % Math.PI*2;
console.log(a)
var p = (Math.atan2(sum.x, sum.y) / (Math.PI * 2)) * modulus
var p = (a / (Math.PI * 2)) * modulus
console.log(p)
g.selectAll('circle.v')
.data(vectors)
.enter()
.append('circle')
.attr('class', 'v')
.attr('r', 5)
.attr('fill', 'blue')
.style('opacity', 0.5)
.attr('cx', function(d){return d.x * 50})
.attr('cy', function(d){return d.y * 50})
g.selectAll('circle.va')
.data([sum])
.enter()
.append('circle')
.attr('class', 'va')
.attr('r', 5)
.attr('fill', 'red')
.attr('cx', function(d){return d.x * 50})
.attr('cy', function(d){return d.y * 50})
</script>
</body>
</html>