When you encode data with a circle, create a legend using the same scale.
forked from HarryStevens's block: Circles Legend
Created
May 2, 2018 04:59
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Circles Legend
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| height: 110 | |
| license: gpl-3.0 |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 0; | |
| font-family: "Helvetica", sans-serif; | |
| } | |
| #legend { | |
| margin: 0 auto; | |
| display: table; | |
| } | |
| .legend-circle { | |
| fill: none; | |
| stroke: #000; | |
| } | |
| .legend-dotted-line { | |
| stroke: #000; | |
| stroke-dasharray: 2, 2; | |
| shape-rendering: crispEdges; | |
| } | |
| .legend-number { | |
| font-size: .7em; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="legend"></div> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var data = [{name: "Andrew", value: 237}, {name: "Bob", value: 120}], | |
| variable = "value", | |
| max_circle_size = 50, | |
| max_data = d3.max(data, function(d){ return d[variable]; }), | |
| circle_scale = d3.scaleLinear() | |
| .range([0, max_circle_size]) | |
| .domain([0, max_data]), | |
| legend_text_left_pad = 8, | |
| legend_width = max_circle_size * 3, | |
| legend_height = max_circle_size * 2 + 10, | |
| legend = d3.select("#legend").append("svg") | |
| .attr("width", legend_width) | |
| .attr("height", legend_height), | |
| legend_data = [max_data, 150, 50], | |
| legend_circle = legend.selectAll(".legend-circle") | |
| .data(legend_data) | |
| .enter().append("circle") | |
| .attr("class", "legend-circle") | |
| .attr("cy", function(d){ return circle_scale(d) + 1; }) | |
| .attr("cx", circle_scale(max_data) + 1) | |
| .attr("r", function(d){ return circle_scale(d); }), | |
| legend_dotted_line = legend.selectAll(".legend-dotted-line") | |
| .data(legend_data) | |
| .enter().append("line") | |
| .attr("class", "legend-dotted-line") | |
| .attr("x1", circle_scale(max_data) + 1) | |
| .attr("x2", circle_scale(max_data) * 2 + legend_text_left_pad) | |
| .attr("y1", function(d){ return circle_scale(d * 2) + 1; }) | |
| .attr("y2", function(d){ return circle_scale(d * 2) + 1; }), | |
| legend_number = legend.selectAll(".legend-number") | |
| .data(legend_data) | |
| .enter().append("text") | |
| .attr("class", "legend-number") | |
| .attr("x", circle_scale(max_data) * 2 + legend_text_left_pad) | |
| .attr("y", function(d){ return circle_scale(d * 2) + 5; }) | |
| .text(function(d, i){ return d + (i == legend_data.length - 1 ? " " + variable : ""); }); | |
| </script> | |
| </body> | |
| </html> |
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