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November 7, 2018 06:19
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bar chart scale
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| license: mit |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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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([0, yMax]) | |
| .range([height - margin.bottom, margin.top]) | |
| // console.log(yScale(25)) | |
| let heightScale = d3.scaleLinear() | |
| .domain([0, yMax]) | |
| .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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