Histogram can be brushed.
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August 6, 2019 19:58
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brush histogram
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| license: gpl-3.0 | |
| height: 700 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .bar { | |
| fill: steelblue; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| let data = [] | |
| let ordinals = [] | |
| for(let i = 0;i < 100; i++){ | |
| data.push({ | |
| value: Math.random()*10, | |
| city: 'test' + i | |
| }) | |
| ordinals.push('test' + i) | |
| } | |
| let margin = { | |
| top: 50, | |
| right: 100, | |
| bottom: 50, | |
| left: 100 | |
| }, | |
| width = 1000 - margin.left - margin.right, | |
| height = 700 - margin.top - margin.bottom - 80, | |
| height2 = 40, | |
| radius = (Math.min(width, height) / 2) - 10, | |
| node | |
| const svg = d3.select('body') | |
| .append('svg') | |
| .attr('width', 960) | |
| .attr('height', 700) | |
| const focus = svg.append('g') | |
| .attr('class', 'focus') | |
| .attr('transform', `translate(${margin.left}, ${margin.top})`) | |
| const context = svg.append('g') | |
| .attr('class', 'context') | |
| .attr('transform', `translate(${margin.left}, ${margin.top + 550})`) | |
| // the scale | |
| let x = d3.scaleLinear().range([0, width]) | |
| let x2 = d3.scaleLinear().range([0, width]) | |
| let y = d3.scaleLinear().range([height, 0]) | |
| let y2 = d3.scaleLinear().range([height2, 0]) | |
| let xBand = d3.scaleBand().domain(d3.range(-1, ordinals.length)).range([0, width]) | |
| let xAxis = d3.axisBottom(x).tickFormat((d, e) => ordinals[d]) | |
| let xAxis2 = d3.axisBottom(x2) | |
| let yAxis = d3.axisLeft(y) | |
| let yAxis2 = d3.axisLeft(y2) | |
| let brush = d3.brushX() | |
| .extent([[0, 0], [width, height2]]) | |
| .on('brush', brushed) | |
| x.domain([-1, ordinals.length]) | |
| y.domain([0, d3.max(data, d => d.value)]) | |
| x2.domain(x.domain()) | |
| y2.domain([0, d3.max(data, d => d.value)]) | |
| focus.append('g') | |
| .attr('clip-path','url(#my-clip-path)') | |
| .selectAll('.bar') | |
| .data(data) | |
| .enter() | |
| .append('rect') | |
| .attr('class', 'bar') | |
| .attr('x', (d, i) => { | |
| return x(i) - xBand.bandwidth()*0.9/2 | |
| }) | |
| .attr('y', (d, i) => { | |
| return y(d.value) | |
| }) | |
| .attr('width', xBand.bandwidth()*0.9) | |
| .attr('height', d => { | |
| return height - y(d.value) | |
| }) | |
| focus.append('g') | |
| .attr('class', 'axis') | |
| .attr('transform', `translate(0,${height})`) | |
| .call(xAxis) | |
| focus.append('g') | |
| .attr('class', 'axis axis--y') | |
| .call(yAxis) | |
| let defs = focus.append('defs') | |
| // use clipPath | |
| defs.append('clipPath') | |
| .attr('id', 'my-clip-path') | |
| .append('rect') | |
| .attr('width', width) | |
| .attr('height', height) | |
| context.selectAll('.bar') | |
| .data(data) | |
| .enter() | |
| .append('rect') | |
| .attr('class', 'bar') | |
| .attr('x', (d, i) => { | |
| return x2(i) - xBand.bandwidth()*0.9/2 | |
| }) | |
| .attr('y', (d, i) => y2(d.value)) | |
| .attr('width', xBand.bandwidth()*0.9) | |
| .attr('height', d => { | |
| return height2 - y2(d.value) | |
| }) | |
| context.append('g') | |
| .attr('class', 'axis2') | |
| .attr('transform', `translate(0,${height2})`) | |
| .call(xAxis) | |
| context.append('g') | |
| .attr('class', 'brush') | |
| .call(brush) | |
| .call(brush.move, x.range()) | |
| function brushed() { | |
| var s = d3.event.selection || x2.range() | |
| x.domain(s.map(x2.invert, x2)) | |
| focus.select('.axis').call(xAxis) | |
| focus.selectAll('.bar') | |
| .attr('x', (d, i) => { | |
| return x(i) - xBand.bandwidth()*0.9/2 | |
| }) | |
| } | |
| </script> | |
| </html> |
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