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forked from areologist's block: axes and margins
forked from areologist's block: axes and margins - responsive
forked from areologist's block: column chart
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July 22, 2017 21:15
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column chart (general update pattern)
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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; } | |
| .chart { | |
| background-color: #f6fafc; | |
| border: 1px solid #333; | |
| } | |
| .bar { | |
| fill: steelblue; | |
| opacity: 0.7; | |
| } | |
| .bar:hover { | |
| opacity: 1; | |
| } | |
| .tick text { | |
| font-size: 10px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="chart"></div> | |
| <button onclick="changeSubject('math')">math</button> | |
| <button onclick="changeSubject('science')">science</button> | |
| <button onclick="changeSubject('language')">language</button> | |
| <script> | |
| const margin = { top: 25, right: 35, bottom: 50, left: 35 }; | |
| const width = 650 - margin.left - margin.right; | |
| const height = 450 - margin.top - margin.bottom; | |
| const fullWidth = width + margin.left + margin.right; | |
| const fullHeight = height + margin.top + margin.bottom; | |
| const data = [ | |
| {name: 'Alice', math: 37, science: 52, language: 54}, | |
| {name: 'Billy', math: null, science: 34, language: 95}, | |
| {name: 'Cindy', math: 86, science: 48, language: null}, | |
| {name: 'David', math: 44, science: null, language: 75}, | |
| {name: 'Emily', math: 59, science: 43, language: 29} | |
| ]; | |
| const svg = d3.select('.chart') | |
| .append('svg') | |
| .attr('width', width + margin.left + margin.right) | |
| .attr('height', height + margin.top + margin.bottom) | |
| //.call(responsivefy) | |
| .append('g') | |
| .attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')'); | |
| const xScale = d3.scaleBand() | |
| .padding(0.2) | |
| .domain(data.map(d => d.name)) | |
| .range([0, width]); | |
| const yScale = d3.scaleLinear() | |
| .domain([0, 100]) | |
| .range([height, 0]); | |
| const yAxis = d3.axisLeft(yScale) | |
| .ticks(10); | |
| // add the axis by passing it into d3.call (and wrap it in a <g>) | |
| const yAxisElement = svg.append('g') | |
| .call(yAxis); | |
| const xAxis = d3.axisBottom(xScale); | |
| svg.append('g') | |
| .attr('transform', `translate(0, ${height})`) | |
| .call(xAxis) | |
| .selectAll('text') | |
| .style('text-anchor', 'end') | |
| .attr('transform', 'rotate(-45)'); | |
| function render(subject = 'math') { | |
| const speed = 500; | |
| const t = d3.transition() | |
| .duration(speed) | |
| .ease(d3.easeCubicOut); | |
| const update = svg.selectAll('rect') | |
| .data(data.filter(d => d[subject]), d => d.name); | |
| update.exit() | |
| .transition(t) | |
| .attr('y', height) | |
| .attr('height', 0) | |
| .remove(); | |
| yScale.domain([0, d3.max(data, d => d[subject])]) | |
| .nice(); | |
| yAxisElement.transition() | |
| .delay(speed) | |
| .call(d3.axisLeft(yScale)); | |
| update.transition(t) | |
| .delay(speed) | |
| .attr('y', d => yScale(d[subject])) | |
| .attr('height', d => height - yScale(d[subject])); | |
| update.enter() | |
| .append('rect') | |
| .attr('class', 'bar') | |
| .attr('y', height) | |
| .attr('height', 0) | |
| .attr('x', d => xScale(d.name)) | |
| .attr('width', xScale.bandwidth()) | |
| .transition(t) | |
| .delay(update.exit().size() ? speed : 0) | |
| .attr('y', d => yScale(d[subject])) | |
| .attr('height', d => height - yScale(d[subject])); | |
| } | |
| render(); | |
| function changeSubject(subject) { | |
| render(subject); | |
| } | |
| /// | |
| function responsivefy(svg) { | |
| // get container + svg aspect ratio | |
| var container = d3.select(svg.node().parentNode), | |
| width = parseInt(svg.style("width")), | |
| height = parseInt(svg.style("height")), | |
| aspect = width / height; | |
| // add viewBox and preserveAspectRatio properties, | |
| // and call resize so that svg resizes on inital page load | |
| svg.attr("viewBox", "0 0 " + width + " " + height) | |
| .attr("preserveAspectRatio", "xMinYMid") | |
| .call(resize); | |
| // to register multiple listeners for same event type, | |
| // you need to add namespace, i.e., 'click.foo' | |
| // necessary if you call invoke this function for multiple svgs | |
| // api docs: https://github.com/mbostock/d3/wiki/Selections#on | |
| d3.select(window).on("resize." + container.attr("id"), resize); | |
| // get width of container and resize svg to fit it | |
| function resize() { | |
| var targetWidth = parseInt(container.style("width")); | |
| svg.attr("width", targetWidth); | |
| svg.attr("height", Math.round(targetWidth / aspect)); | |
| } | |
| } | |
| </script> | |
| </body> |
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