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November 9, 2017 21:03
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| copyright: mit |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8"> | |
| <title>Simple Circles</title> | |
| <script type="text/javascript" src="http://d3js.org/d3.v2.min.js"></script> | |
| <!-- <link rel="stylesheet" type="text/css" href="index.css"> --> | |
| </head> | |
| <body> | |
| <h1>Circles</h1> | |
| <script type="text/javascript" src="index.js"></script> | |
| </body> | |
| </html> |
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| // Via https://bost.ocks.org/mike/join/ | |
| // Also https://www.dashingd3js.com/adding-an-svg-element | |
| // d3.select("body") | |
| // .selectAll("p") | |
| // .data([2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 39, 41, 43, 47, 53, 59, 61, 67]) | |
| // .enter().append("p") | |
| // .text(function(d) { return "I'm number " + d + "!"; }); | |
| // Set up SVG | |
| d3.select("body") | |
| .append("svg") | |
| .attr("width", 500) | |
| .attr("height", 500); | |
| // // Single Circle | |
| // .append("circle") | |
| // .attr("cx", 80) | |
| // .attr("cy", 40) | |
| // .attr("r", 25) | |
| // .style("fill", "steelblue"); | |
| // Multiple Circles | |
| var data = [ | |
| {"x": 40, "y": 80}, | |
| {"x": 48, "y": 83}, | |
| {"x": 76, "y": 88}, | |
| {"x": 85, "y": 102}, | |
| {"x": 99, "y": 107}, | |
| {"x": 100, "y": 109}, | |
| {"x": 104, "y": 113}, | |
| {"x": 140, "y": 122}, | |
| {"x": 160, "y": 140}, | |
| {"x": 172, "y": 144}, | |
| {"x": 188, "y": 149}, | |
| {"x": 193, "y": 180}, | |
| ]; | |
| // | |
| // var circle = svg.selectAll("circle") | |
| // .data(data) | |
| // | |
| // circle.exit().remove(); | |
| // | |
| // circle.enter().append("circle") | |
| // .attr("r", 2.5) | |
| // .merge(circle) | |
| // .attr("cx", function(d) { return d.x; }) | |
| // .attr("cy", function(d) { return d.y; }) | |
| d3.select("svg") | |
| .selectAll("circle") | |
| .data(data) | |
| .enter().append("circle") | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }) | |
| .attr("r", 2.5); | |
| // Not sure how this works yet: | |
| // d3.select("svg").selectAll("circle").transition() | |
| // .duration(2000) | |
| // .delay(function(d, i) { return i * 10; }) | |
| // .attr("r", function(d) { return Math.sqrt(d * scale); }); |
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