When you encode data with a circle, create a legend using the same scale.
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June 12, 2018 14:50
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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, d => 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", d => circle_scale(d) + 1) | |
| .attr("cx", circle_scale(max_data) + 1) | |
| .attr("r", d => 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", d => circle_scale(d) * 2 + 1) | |
| .attr("y2", d => 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", d => circle_scale(d) * 2 + 5) | |
| .text((d, i) => d + (i == legend_data.length - 1 ? " " + variable : "")); | |
| </script> | |
| </body> | |
| </html> |
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