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October 12, 2015 22:13
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oh yes spiral
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<!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 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) | |
x = Math.cos(rad)*d + p.x | |
y = Math.sin(rad)*d + p.y | |
return {x:x, y:y} | |
} | |
//https://upload.wikimedia.org/wikipedia/commons/7/72/Turtle-Graphics_Polyspiral.svg | |
var lineData = [] | |
var theta = -1 | |
var d = 3; | |
var p = {x:312, y:250} | |
//lineData.push(p) | |
for (i = 0; i < 500; i+=1) { | |
p = nextPoint(p, d, theta) | |
lineData.push(p) | |
theta -= 89 | |
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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