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October 30, 2018 04:20
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D3 study: line
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license: mit |
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<!DOCTYPE html> | |
<head> | |
<meta charset="utf-8"> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<style> | |
body { | |
margin:0; | |
position:fixed; | |
top:0; | |
right:0; | |
bottom:0; | |
left:0; | |
} | |
.bordered { | |
border: 1px solid #999 | |
} | |
.margin-div { | |
margin: 20px 0; | |
} | |
</style> | |
</head> | |
<body> | |
<div> | |
<svg id='svg'/> | |
</div> | |
<script> | |
// NEW LESSON ************************************************* | |
setTimeout(() => { | |
let city = 'San Francisco'; | |
let width = 700; | |
let height = 300; | |
let margin = { | |
top: 20, | |
bottom: 20, | |
left: 20, | |
right: 20, | |
}; | |
let svg = d3.select('svg') | |
.attr('class', 'bordered') | |
.attr('height', height) | |
.attr('width', width) | |
// Generate dummy data **************** | |
let months = 6; | |
let days; | |
let data = []; | |
while (months > 0) { | |
days = 30; | |
while(days > 0) { | |
data.push({ | |
date: new Date('2018-' + months + '-' + days), | |
[city]: Math.round(35 * Math.random()) + 15 | |
}) | |
--days | |
} | |
--months | |
} | |
// console.log(data); | |
// Finish Generate dummy data ********* | |
// scalse | |
let xExtent = d3.extent(data, d => d.date) | |
// console.log(xExtent); | |
let xScale = d3.scaleTime() | |
.domain(xExtent) | |
.range([margin.left, width - margin.right]); | |
let yMax = d3.max(data, d=> d[city]); | |
let yExtent = d3.extent(data, d=> d[city]); | |
// console.log(yExtent); | |
let yScale = d3.scaleLinear() | |
// domain - data deending measures | |
.domain([0, yMax]) | |
// | |
.range([height - margin.bottom, margin.top]) | |
// console.log(yScale(25)) | |
let heightScale = d3.scaleLinear() | |
.domain(yExtent) | |
.range([0, height - margin.top - margin.bottom]) | |
// let rect = svg.selectAll('rect') | |
// .data(data) | |
// .enter().append('rect') | |
// .attr('width', 2) | |
// .attr('height', d => heightScale(d[city])) | |
// .attr('x', d => xScale(d.date)) | |
// .attr('y', d => yScale(d[city])) | |
// .attr('fill', 'blue') | |
// .attr('stroke', '#fff') | |
let line = d3.line() | |
.x(d => xScale(d.date)) | |
.y(d => yScale(d[city])) | |
.curve(d3.curveStep) | |
svg.append('path') | |
.attr('d', line(data)) | |
.attr('fill', 'none') | |
.attr('stroke', 'blue') | |
let xAxis = d3.axisBottom() | |
.scale(xScale) | |
let yAxis = d3.axisLeft() | |
.scale(yScale) | |
svg.append('g') | |
.attr('transform', 'translate('+[0, height - margin.bottom]+')') | |
.call(xAxis) | |
svg.append('g') | |
.attr('transform', 'translate('+[margin.left, 0]+')') | |
.call(yAxis) | |
}, 10) | |
</script> | |
</body> |
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