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 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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