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December 28, 2015 15:43
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Parabola
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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%; } | |
path { | |
fill: none; | |
stroke: teal; | |
} | |
.axis path, line { | |
stroke: #aaa; | |
shape-rendering: crispEdges; | |
} | |
.axis text { | |
fill: #aaa; | |
font-size: 11px; | |
} | |
</style> | |
</head> | |
<body> | |
<script> | |
var margin = {top: 50, right: 50, bottom: 50, left: 50}; | |
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 + ")"); | |
var fn = function (x) { | |
return Math.pow(x, 2); | |
}; | |
var x = d3.scale.linear() | |
.range([0, width]); | |
var y = d3.scale.linear() | |
.range([height, 0]); | |
var xAxis = d3.svg.axis() | |
.scale(x); | |
var yAxis = d3.svg.axis() | |
.orient('left') | |
.scale(y); | |
var line = d3.svg.line() | |
.interpolate('basis') | |
.x(function (d) {return x(d.x);}) | |
.y(function (d) {return y(d.y);}); | |
var data = d3.range(-10, 11).map(function (d) { | |
return {x:d, y:fn(d)}; | |
}); | |
x.domain(d3.extent(data, function (d) {return d.x;})); | |
y.domain([0, d3.max(data, function (d) {return d.y;})]); | |
svg.append('g') | |
.attr('class', 'axis') | |
.attr('transform', 'translate(0,' + height + ')') | |
.call(xAxis); | |
svg.append('g') | |
.attr('class', 'axis') | |
.attr('transform', 'translate(' + width/2 + ',0)') | |
.call(yAxis); | |
svg.append('path') | |
.datum(data) | |
.attr('d', line); | |
</script> | |
</body> |
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