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D3 v4 Bar Chart Transition
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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; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| const DATA = [10, 20, 40, 70, 50, 30, 90, 120, 5, 65, 75]; | |
| const WIDTH = 400; | |
| const HEIGHT = 200; | |
| const INNER_HEIGHT = HEIGHT - 20; | |
| const BAR_WIDTH = 24; | |
| const BAR_GAP = 2; | |
| function preprocess(data) { | |
| data = d3.shuffle([...data]); | |
| return data.map((d, i) => ({ id: i, value: d })); | |
| } | |
| const scale = d3.scaleLinear() | |
| .domain([0, d3.max(DATA)]) | |
| .range([0, INNER_HEIGHT]); | |
| function y(d) { | |
| return HEIGHT - scale(d.value); | |
| } | |
| function height(d) { | |
| return scale(d.value); | |
| } | |
| const svg = d3.select("body").append("svg") | |
| .attr("width", WIDTH) | |
| .attr("height", HEIGHT) | |
| .append("g"); | |
| function update(data) { | |
| const t = d3.transition() | |
| .duration(750); | |
| const bar = svg.selectAll("g") | |
| .data(data, d => d.id); | |
| // EXIT section | |
| bar | |
| .exit() | |
| .remove(); | |
| // UPDATE section | |
| bar | |
| .transition(t) | |
| .attr("transform", (d, i) => `translate(${i * (BAR_WIDTH + BAR_GAP)},${y(d)})`); | |
| bar.select("rect") | |
| .transition(t) | |
| .attr("height", height); | |
| bar.select("text") | |
| .transition(t) | |
| .tween("text", function(d) { | |
| const v0 = this.textContent || "0"; | |
| const v1 = d.value; | |
| const i = d3.interpolateRound(v0, v1); | |
| return t => this.textContent = i(t); | |
| }); | |
| // ENTER section | |
| const barEnter = bar | |
| .enter().append("g") | |
| .attr("transform", (d, i) => `translate(${i * (BAR_WIDTH + BAR_GAP)},${INNER_HEIGHT})`); | |
| barEnter | |
| .transition(t) | |
| .attr("transform", (d, i) => `translate(${i * (BAR_WIDTH + BAR_GAP)},${y(d)})`); | |
| const rect = barEnter.append("rect") | |
| .attr("x", 0) | |
| .attr("y", 0) | |
| .attr("width", BAR_WIDTH) | |
| .attr("height", 0); | |
| rect | |
| .transition(t) | |
| .attr("height", height); | |
| const text = barEnter.append("text") | |
| .text(d => d.value) | |
| .attr("text-anchor", "middle") | |
| .attr("dx", BAR_WIDTH / 2) | |
| .attr("dy", -2); | |
| } | |
| d3.interval(() => { | |
| update(preprocess(DATA)); | |
| }, 2000); | |
| </script> | |
| <div class="chart"></div> | |
| <p> Taken from <a href="https://codepen.io/netkuy/pen/KzPaBe">here</a> and copied over for better viewing. </p> | |
| </body> |
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