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November 20, 2016 20:19
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Fibonacci Spiral
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<body> | |
<script src="https://d3js.org/d3.v3.min.js"></script> | |
<script> | |
var width = 960, | |
height = 600; | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height) | |
.append("g"); | |
var iterationNumber = 15; | |
var u = []; | |
u[0]= 1; | |
u[1]= 1; | |
var d = "m" + width * .5 + "," +height * .5; | |
for (i=0; i<iterationNumber ; i++) { | |
r = u[i]; | |
x = (i % 4 < 2) ? r : r * (-1); | |
y = ((i+1) % 4 < 2) ? r : r * (-1); | |
d += "a" + r + "," + r + " 0 0 0" + x + "," + y | |
u[i+2] = u[i] + u[i+1]; | |
} | |
var path = svg.append("path") | |
.attr("d", d) | |
.style("stroke-width", 3) | |
.style("stroke","#1f78b4") | |
.style("fill","none"); | |
var totalLength = path.node().getTotalLength(); | |
path.attr("stroke-dasharray", totalLength + " " + totalLength) | |
.attr("stroke-dashoffset", totalLength) | |
.transition() | |
.duration(2000) | |
.delay(500) | |
.ease("exp") | |
.attr("stroke-dashoffset", 0); | |
d3.select(self.frameElement).style("height", height + "px"); | |
</script> |
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