Use D3's general update pattern to animate bar chart transitions.
forked from HarryStevens's block: Bar Update Pattern
Created
July 23, 2017 08:13
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Bar Update Pattern
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| text { | |
| font-family: "Helvetica Neue", sans-serif; | |
| fill: #fff; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://unpkg.com/jeezy/lib/jeezy.min.js"></script> | |
| <script> | |
| var alpha = "abcdef".split(""); | |
| var setup = d3_marcon({top: 10, bottom: 10, left: 10, right: 10, width: window.innerWidth, height: window.innerHeight, element: "body"}); | |
| var width = setup.width, height = setup.height, svg = setup.svg; | |
| var x = d3.scaleBand() | |
| .rangeRound([0, width]) | |
| .domain(alpha) | |
| .padding(.1); | |
| var y = d3.scaleLinear() | |
| .range([height, 0]) | |
| .domain([0, 10]); | |
| var color = d3.scaleOrdinal(["#66c2a5","#fc8d62","#8da0cb","#e78ac3","#a6d854","#ffd92f"]); | |
| redraw(random_data()); | |
| d3.interval(function(){ | |
| redraw(random_data()); | |
| }, 1000); | |
| function redraw(data){ | |
| // join | |
| var bar = svg.selectAll(".bar") | |
| .data(data, function(d){ return d.name; }); | |
| var amount = svg.selectAll(".amount") | |
| .data(data, function(d){ return d.name; }); | |
| // update | |
| bar | |
| .transition() | |
| .attr("y", function(d){ return y(d.value); }) | |
| .attr("height", function(d){ return height - y(d.value); }); | |
| amount | |
| .transition() | |
| .attr("y", function(d){ return y(d.value); }) | |
| .text(function(d){ return d.value; }); | |
| // enter | |
| bar.enter().append("rect") | |
| .attr("class", "bar") | |
| .attr("x", function(d){ return x(d.name); }) | |
| .attr("y", function(d){ return y(d.value); }) | |
| .attr("width", x.bandwidth()) | |
| .attr("height", function(d){ return height - y(d.value); }) | |
| .attr("fill", function(d){ return color(d.name); }); | |
| amount.enter().append("text") | |
| .attr("class", "amount") | |
| .attr("x", function(d){ return x(d.name) + x.bandwidth() / 2; }) | |
| .attr("y", function(d){ return y(d.value); }) | |
| .attr("dy", 16) | |
| .text(function(d){ return d.value; }); | |
| } | |
| // Options | |
| // top, left, bottom, right, width, height, element | |
| function d3_marcon(options){ | |
| var margin = {top: options.top, bottom: options.bottom, left: options.left, right: options.right}, | |
| width = options.width - margin.left - margin.right, | |
| height = options.height - margin.top - margin.bottom, | |
| svg = d3.select(options.element).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 + ")"); | |
| return { | |
| margin: margin, | |
| width: width, | |
| height: height, | |
| svg: svg | |
| } | |
| } | |
| function random_data(){ | |
| return alpha.map(function(d){ | |
| return { | |
| name: d, | |
| value: jz.num.randBetween(1, 10) | |
| } | |
| }); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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