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georules/README.md

Last active February 16, 2016 18:20
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oh yes spiral fib
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README.md
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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 fib= function(n) {
var fst = 1, sec = 1, add;
for (var i = 0; i < n; i++) {
add = fst + sec;
fst = sec;
sec = add;
}
return add;
}
var margin = {top: 20, right: 10, bottom: 20, left: 10};
var width = 960 - margin.left - margin.right;
var height = 500 - margin.top - margin.bottom;
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
console.log("you are now rocking with d3", d3);
var nextPoint = function(p,d,theta) {
rad = theta * Math.PI/180.0
m = Math.tan(rad)
f = fib(p)
x = f*Math.cos(p)+300//*100+300//Math.cos(rad)*d + p.x
y = f*Math.sin(p)+300//*100+200
return {x:x, y:y}
}
//https://upload.wikimedia.org/wikipedia/commons/7/72/Turtle-Graphics_Polyspiral.svg
var lineData = []
var theta = -1
var d = 5;
var p = {x:312, y:250}
//lineData.push(p)
for (i = 1; i < 12; i+=1) {
p = nextPoint(p, d, theta)
p = nextPoint(i,p,theta)
lineData.push(p)
theta -= 89.5
d += 5
}
var lineFunction = d3.svg.line()
.x(function(d) { return d.x; })
.y(function(d) { return d.y; })
.interpolate("linear");
var lineGraph = svg.append("path")
.attr("d", lineFunction(lineData))
.attr("stroke", "black")
.attr("stroke-width", 1)
.attr("fill", "none");
</script>
</body>
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