A scatter chart comparing two variables at each point along the x-axis. A connector line between the circles indicates that the two variables are related (e.g. male and female). As with other bubble charts, each circle can encode four data attributes: (1) horizontal position, (2) vertical position, (3) size, and (4) color.
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July 24, 2017 08:03
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Barbell Chart
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| font-family: "Helvetica Neue", sans-serif; | |
| } | |
| .dot { | |
| stroke-width: 1px; | |
| fill-opacity: .6; | |
| } | |
| .dot.a { | |
| stroke: steelblue; | |
| fill: steelblue; | |
| } | |
| .dot.b { | |
| stroke: tomato; | |
| fill: tomato; | |
| } | |
| .connect-line { | |
| stroke: #ccc; | |
| stroke-width: 1px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="viz"></div> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://unpkg.com/d3-marcon/build/d3-marcon.min.js"></script> | |
| <script> | |
| // config | |
| var m = d3.marcon().top(40).bottom(40).left(40).right(40).width(window.innerWidth).height(window.innerHeight); | |
| m.render(); | |
| var width = m.innerWidth(), | |
| height = m.innerHeight(), | |
| svg = m.svg(), | |
| x_scale = d3.scaleLinear() | |
| .range([0, width]) | |
| .domain([0, 100]), | |
| y_scale = d3.scaleLinear() | |
| .range([height, 0]) | |
| .domain([0, 1000]), | |
| size_scale = d3.scaleLinear() | |
| .range([1, 30]) | |
| .domain([1, 30]), | |
| t = d3.transition() | |
| .duration(750), | |
| x_axis = d3.axisBottom() | |
| .scale(x_scale), | |
| y_axis = d3.axisLeft() | |
| .scale(y_scale); | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(x_axis); | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(y_axis); | |
| draw_chart(generate_binned_data()); | |
| d3.interval(function(){ | |
| draw_chart(generate_binned_data()); | |
| }, 2000); | |
| function draw_chart(data){ | |
| // JOIN | |
| var dot_a = svg.selectAll(".dot.a") | |
| .data(data, function(d){ return d.x; }); | |
| var dot_b = svg.selectAll(".dot.b") | |
| .data(data, function(d){ return d.x; }); | |
| var connect_line = svg.selectAll(".connect-line") | |
| .data(data, function(d){ return d.x }); | |
| // EXIT | |
| dot_a.exit() | |
| .transition(t) | |
| .style("r", 1e-6) | |
| .remove(); | |
| dot_b.exit() | |
| .transition(t) | |
| .style("r", 1e-6) | |
| .remove(); | |
| connect_line.exit() | |
| .transition(t) | |
| .style("opacity", 1e-6) | |
| .remove(); | |
| // UPDATE | |
| dot_a | |
| .transition(t) | |
| .attr("cx", function(d){ return x_scale(d.x); }) | |
| .attr("cy", function(d){ return y_scale(d.y_a); }) | |
| .attr("r", function(d){ return size_scale(d.size_a); }); | |
| dot_b | |
| .transition(t) | |
| .attr("cx", function(d){ return x_scale(d.x); }) | |
| .attr("cy", function(d){ return y_scale(d.y_b); }) | |
| .attr("r", function(d){ return size_scale(d.size_b); }); | |
| connect_line | |
| .transition(t) | |
| .attr("y1", function(d){ return y_scale(d.y_a) + (size_scale(d.size_a) * multiplier(d.y_a, d.y_b)); }) | |
| .attr("y2", function(d){ return y_scale(d.y_b) - (size_scale(d.size_b) * multiplier(d.y_a, d.y_b)); }) | |
| // ENTER | |
| dot_a.enter().append("circle") | |
| .attr("class", "dot a") | |
| .attr("cx", function(d){ return x_scale(d.x); }) | |
| .attr("cy", function(d){ return y_scale(d.y_a); }) | |
| .attr("r", 1e-6) | |
| .transition(t) | |
| .attr("r", function(d){ return size_scale(d.size_a); }); | |
| dot_b.enter().append("circle") | |
| .attr("class", "dot b") | |
| .attr("cx", function(d){ return x_scale(d.x); }) | |
| .attr("cy", function(d){ return y_scale(d.y_b); }) | |
| .attr("r", 1e-6) | |
| .transition(t) | |
| .attr("r", function(d){ return size_scale(d.size_b); }); | |
| connect_line.enter().append("line") | |
| .attr("class", "connect-line") | |
| .attr("x1", function(d){ return x_scale(d.x); }) | |
| .attr("y1", function(d){ return y_scale(d.y_a) + (size_scale(d.size_a) * multiplier(d.y_a, d.y_b)); }) | |
| .attr("x2", function(d){ return x_scale(d.x); }) | |
| .attr("y2", function(d){ return y_scale(d.y_b) - (size_scale(d.size_b) * multiplier(d.y_a, d.y_b)); }) | |
| } | |
| // a or b on top | |
| function multiplier(a, b){ | |
| return a > b ? 1 : -1; | |
| } | |
| // make some data | |
| function generate_binned_data(){ | |
| var bin_size = 5, | |
| arr = []; | |
| for (var i = bin_size; i <= 95; i += bin_size){ | |
| arr.push({ | |
| x: i, | |
| size_a: random(1, 30), | |
| size_b: random(1, 30), | |
| y_a: random(1, 1000), | |
| y_b: random(1, 1000) | |
| }); | |
| } | |
| return arr; | |
| } | |
| // random number function | |
| function random(min, max){ | |
| return Math.floor(Math.random() * (max - min + 1) + min); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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