Bubble charts encode data in the area of circles. Although less perceptually-accurate than bar charts, they can pack hundreds of values into a small space. Implementation based on work by Jeff Heer. Data shows the Flare class hierarchy, also courtesy Jeff Heer.
          Last active
          October 22, 2025 00:32 
        
      - 
      
 - 
        
Save mbostock/4063269 to your computer and use it in GitHub Desktop.  
    Bubble Chart
  
        
  
    
      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.
      Learn more about bidirectional Unicode characters
    
  
  
    
  | license: gpl-3.0 | |
| height: 960 | |
| border: no | |
| redirect: https://observablehq.com/@d3/bubble-chart | 
  
    
      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.
      Learn more about bidirectional Unicode characters
    
  
  
    
    | id | value | |
|---|---|---|
| flare | ||
| flare.analytics | ||
| flare.analytics.cluster | ||
| flare.analytics.cluster.AgglomerativeCluster | 3938 | |
| flare.analytics.cluster.CommunityStructure | 3812 | |
| flare.analytics.cluster.HierarchicalCluster | 6714 | |
| flare.analytics.cluster.MergeEdge | 743 | |
| flare.analytics.graph | ||
| flare.analytics.graph.BetweennessCentrality | 3534 | |
| flare.analytics.graph.LinkDistance | 5731 | |
| flare.analytics.graph.MaxFlowMinCut | 7840 | |
| flare.analytics.graph.ShortestPaths | 5914 | |
| flare.analytics.graph.SpanningTree | 3416 | |
| flare.analytics.optimization | ||
| flare.analytics.optimization.AspectRatioBanker | 7074 | |
| flare.animate | ||
| flare.animate.Easing | 17010 | |
| flare.animate.FunctionSequence | 5842 | |
| flare.animate.interpolate | ||
| flare.animate.interpolate.ArrayInterpolator | 1983 | |
| flare.animate.interpolate.ColorInterpolator | 2047 | |
| flare.animate.interpolate.DateInterpolator | 1375 | |
| flare.animate.interpolate.Interpolator | 8746 | |
| flare.animate.interpolate.MatrixInterpolator | 2202 | |
| flare.animate.interpolate.NumberInterpolator | 1382 | |
| flare.animate.interpolate.ObjectInterpolator | 1629 | |
| flare.animate.interpolate.PointInterpolator | 1675 | |
| flare.animate.interpolate.RectangleInterpolator | 2042 | |
| flare.animate.ISchedulable | 1041 | |
| flare.animate.Parallel | 5176 | |
| flare.animate.Pause | 449 | |
| flare.animate.Scheduler | 5593 | |
| flare.animate.Sequence | 5534 | |
| flare.animate.Transition | 9201 | |
| flare.animate.Transitioner | 19975 | |
| flare.animate.TransitionEvent | 1116 | |
| flare.animate.Tween | 6006 | |
| flare.data | ||
| flare.data.converters | ||
| flare.data.converters.Converters | 721 | |
| flare.data.converters.DelimitedTextConverter | 4294 | |
| flare.data.converters.GraphMLConverter | 9800 | |
| flare.data.converters.IDataConverter | 1314 | |
| flare.data.converters.JSONConverter | 2220 | |
| flare.data.DataField | 1759 | |
| flare.data.DataSchema | 2165 | |
| flare.data.DataSet | 586 | |
| flare.data.DataSource | 3331 | |
| flare.data.DataTable | 772 | |
| flare.data.DataUtil | 3322 | |
| flare.display | ||
| flare.display.DirtySprite | 8833 | |
| flare.display.LineSprite | 1732 | |
| flare.display.RectSprite | 3623 | |
| flare.display.TextSprite | 10066 | |
| flare.flex | ||
| flare.flex.FlareVis | 4116 | |
| flare.physics | ||
| flare.physics.DragForce | 1082 | |
| flare.physics.GravityForce | 1336 | |
| flare.physics.IForce | 319 | |
| flare.physics.NBodyForce | 10498 | |
| flare.physics.Particle | 2822 | |
| flare.physics.Simulation | 9983 | |
| flare.physics.Spring | 2213 | |
| flare.physics.SpringForce | 1681 | |
| flare.query | ||
| flare.query.AggregateExpression | 1616 | |
| flare.query.And | 1027 | |
| flare.query.Arithmetic | 3891 | |
| flare.query.Average | 891 | |
| flare.query.BinaryExpression | 2893 | |
| flare.query.Comparison | 5103 | |
| flare.query.CompositeExpression | 3677 | |
| flare.query.Count | 781 | |
| flare.query.DateUtil | 4141 | |
| flare.query.Distinct | 933 | |
| flare.query.Expression | 5130 | |
| flare.query.ExpressionIterator | 3617 | |
| flare.query.Fn | 3240 | |
| flare.query.If | 2732 | |
| flare.query.IsA | 2039 | |
| flare.query.Literal | 1214 | |
| flare.query.Match | 3748 | |
| flare.query.Maximum | 843 | |
| flare.query.methods | ||
| flare.query.methods.add | 593 | |
| flare.query.methods.and | 330 | |
| flare.query.methods.average | 287 | |
| flare.query.methods.count | 277 | |
| flare.query.methods.distinct | 292 | |
| flare.query.methods.div | 595 | |
| flare.query.methods.eq | 594 | |
| flare.query.methods.fn | 460 | |
| flare.query.methods.gt | 603 | |
| flare.query.methods.gte | 625 | |
| flare.query.methods.iff | 748 | |
| flare.query.methods.isa | 461 | |
| flare.query.methods.lt | 597 | |
| flare.query.methods.lte | 619 | |
| flare.query.methods.max | 283 | |
| flare.query.methods.min | 283 | |
| flare.query.methods.mod | 591 | |
| flare.query.methods.mul | 603 | |
| flare.query.methods.neq | 599 | |
| flare.query.methods.not | 386 | |
| flare.query.methods.or | 323 | |
| flare.query.methods.orderby | 307 | |
| flare.query.methods.range | 772 | |
| flare.query.methods.select | 296 | |
| flare.query.methods.stddev | 363 | |
| flare.query.methods.sub | 600 | |
| flare.query.methods.sum | 280 | |
| flare.query.methods.update | 307 | |
| flare.query.methods.variance | 335 | |
| flare.query.methods.where | 299 | |
| flare.query.methods.xor | 354 | |
| flare.query.methods._ | 264 | |
| flare.query.Minimum | 843 | |
| flare.query.Not | 1554 | |
| flare.query.Or | 970 | |
| flare.query.Query | 13896 | |
| flare.query.Range | 1594 | |
| flare.query.StringUtil | 4130 | |
| flare.query.Sum | 791 | |
| flare.query.Variable | 1124 | |
| flare.query.Variance | 1876 | |
| flare.query.Xor | 1101 | |
| flare.scale | ||
| flare.scale.IScaleMap | 2105 | |
| flare.scale.LinearScale | 1316 | |
| flare.scale.LogScale | 3151 | |
| flare.scale.OrdinalScale | 3770 | |
| flare.scale.QuantileScale | 2435 | |
| flare.scale.QuantitativeScale | 4839 | |
| flare.scale.RootScale | 1756 | |
| flare.scale.Scale | 4268 | |
| flare.scale.ScaleType | 1821 | |
| flare.scale.TimeScale | 5833 | |
| flare.util | ||
| flare.util.Arrays | 8258 | |
| flare.util.Colors | 10001 | |
| flare.util.Dates | 8217 | |
| flare.util.Displays | 12555 | |
| flare.util.Filter | 2324 | |
| flare.util.Geometry | 10993 | |
| flare.util.heap | ||
| flare.util.heap.FibonacciHeap | 9354 | |
| flare.util.heap.HeapNode | 1233 | |
| flare.util.IEvaluable | 335 | |
| flare.util.IPredicate | 383 | |
| flare.util.IValueProxy | 874 | |
| flare.util.math | ||
| flare.util.math.DenseMatrix | 3165 | |
| flare.util.math.IMatrix | 2815 | |
| flare.util.math.SparseMatrix | 3366 | |
| flare.util.Maths | 17705 | |
| flare.util.Orientation | 1486 | |
| flare.util.palette | ||
| flare.util.palette.ColorPalette | 6367 | |
| flare.util.palette.Palette | 1229 | |
| flare.util.palette.ShapePalette | 2059 | |
| flare.util.palette.SizePalette | 2291 | |
| flare.util.Property | 5559 | |
| flare.util.Shapes | 19118 | |
| flare.util.Sort | 6887 | |
| flare.util.Stats | 6557 | |
| flare.util.Strings | 22026 | |
| flare.vis | ||
| flare.vis.axis | ||
| flare.vis.axis.Axes | 1302 | |
| flare.vis.axis.Axis | 24593 | |
| flare.vis.axis.AxisGridLine | 652 | |
| flare.vis.axis.AxisLabel | 636 | |
| flare.vis.axis.CartesianAxes | 6703 | |
| flare.vis.controls | ||
| flare.vis.controls.AnchorControl | 2138 | |
| flare.vis.controls.ClickControl | 3824 | |
| flare.vis.controls.Control | 1353 | |
| flare.vis.controls.ControlList | 4665 | |
| flare.vis.controls.DragControl | 2649 | |
| flare.vis.controls.ExpandControl | 2832 | |
| flare.vis.controls.HoverControl | 4896 | |
| flare.vis.controls.IControl | 763 | |
| flare.vis.controls.PanZoomControl | 5222 | |
| flare.vis.controls.SelectionControl | 7862 | |
| flare.vis.controls.TooltipControl | 8435 | |
| flare.vis.data | ||
| flare.vis.data.Data | 20544 | |
| flare.vis.data.DataList | 19788 | |
| flare.vis.data.DataSprite | 10349 | |
| flare.vis.data.EdgeSprite | 3301 | |
| flare.vis.data.NodeSprite | 19382 | |
| flare.vis.data.render | ||
| flare.vis.data.render.ArrowType | 698 | |
| flare.vis.data.render.EdgeRenderer | 5569 | |
| flare.vis.data.render.IRenderer | 353 | |
| flare.vis.data.render.ShapeRenderer | 2247 | |
| flare.vis.data.ScaleBinding | 11275 | |
| flare.vis.data.Tree | 7147 | |
| flare.vis.data.TreeBuilder | 9930 | |
| flare.vis.events | ||
| flare.vis.events.DataEvent | 2313 | |
| flare.vis.events.SelectionEvent | 1880 | |
| flare.vis.events.TooltipEvent | 1701 | |
| flare.vis.events.VisualizationEvent | 1117 | |
| flare.vis.legend | ||
| flare.vis.legend.Legend | 20859 | |
| flare.vis.legend.LegendItem | 4614 | |
| flare.vis.legend.LegendRange | 10530 | |
| flare.vis.operator | ||
| flare.vis.operator.distortion | ||
| flare.vis.operator.distortion.BifocalDistortion | 4461 | |
| flare.vis.operator.distortion.Distortion | 6314 | |
| flare.vis.operator.distortion.FisheyeDistortion | 3444 | |
| flare.vis.operator.encoder | ||
| flare.vis.operator.encoder.ColorEncoder | 3179 | |
| flare.vis.operator.encoder.Encoder | 4060 | |
| flare.vis.operator.encoder.PropertyEncoder | 4138 | |
| flare.vis.operator.encoder.ShapeEncoder | 1690 | |
| flare.vis.operator.encoder.SizeEncoder | 1830 | |
| flare.vis.operator.filter | ||
| flare.vis.operator.filter.FisheyeTreeFilter | 5219 | |
| flare.vis.operator.filter.GraphDistanceFilter | 3165 | |
| flare.vis.operator.filter.VisibilityFilter | 3509 | |
| flare.vis.operator.IOperator | 1286 | |
| flare.vis.operator.label | ||
| flare.vis.operator.label.Labeler | 9956 | |
| flare.vis.operator.label.RadialLabeler | 3899 | |
| flare.vis.operator.label.StackedAreaLabeler | 3202 | |
| flare.vis.operator.layout | ||
| flare.vis.operator.layout.AxisLayout | 6725 | |
| flare.vis.operator.layout.BundledEdgeRouter | 3727 | |
| flare.vis.operator.layout.CircleLayout | 9317 | |
| flare.vis.operator.layout.CirclePackingLayout | 12003 | |
| flare.vis.operator.layout.DendrogramLayout | 4853 | |
| flare.vis.operator.layout.ForceDirectedLayout | 8411 | |
| flare.vis.operator.layout.IcicleTreeLayout | 4864 | |
| flare.vis.operator.layout.IndentedTreeLayout | 3174 | |
| flare.vis.operator.layout.Layout | 7881 | |
| flare.vis.operator.layout.NodeLinkTreeLayout | 12870 | |
| flare.vis.operator.layout.PieLayout | 2728 | |
| flare.vis.operator.layout.RadialTreeLayout | 12348 | |
| flare.vis.operator.layout.RandomLayout | 870 | |
| flare.vis.operator.layout.StackedAreaLayout | 9121 | |
| flare.vis.operator.layout.TreeMapLayout | 9191 | |
| flare.vis.operator.Operator | 2490 | |
| flare.vis.operator.OperatorList | 5248 | |
| flare.vis.operator.OperatorSequence | 4190 | |
| flare.vis.operator.OperatorSwitch | 2581 | |
| flare.vis.operator.SortOperator | 2023 | |
| flare.vis.Visualization | 16540 | 
  
    
      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.
      Learn more about bidirectional Unicode characters
    
  
  
    
  | <!DOCTYPE html> | |
| <svg width="960" height="960" font-family="sans-serif" font-size="10" text-anchor="middle"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var format = d3.format(",d"); | |
| var color = d3.scaleOrdinal(d3.schemeCategory20c); | |
| var pack = d3.pack() | |
| .size([width, height]) | |
| .padding(1.5); | |
| d3.csv("flare.csv", function(d) { | |
| d.value = +d.value; | |
| if (d.value) return d; | |
| }, function(error, classes) { | |
| if (error) throw error; | |
| var root = d3.hierarchy({children: classes}) | |
| .sum(function(d) { return d.value; }) | |
| .each(function(d) { | |
| if (id = d.data.id) { | |
| var id, i = id.lastIndexOf("."); | |
| d.id = id; | |
| d.package = id.slice(0, i); | |
| d.class = id.slice(i + 1); | |
| } | |
| }); | |
| var node = svg.selectAll(".node") | |
| .data(pack(root).leaves()) | |
| .enter().append("g") | |
| .attr("class", "node") | |
| .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }); | |
| node.append("circle") | |
| .attr("id", function(d) { return d.id; }) | |
| .attr("r", function(d) { return d.r; }) | |
| .style("fill", function(d) { return color(d.package); }); | |
| node.append("clipPath") | |
| .attr("id", function(d) { return "clip-" + d.id; }) | |
| .append("use") | |
| .attr("xlink:href", function(d) { return "#" + d.id; }); | |
| node.append("text") | |
| .attr("clip-path", function(d) { return "url(#clip-" + d.id + ")"; }) | |
| .selectAll("tspan") | |
| .data(function(d) { return d.class.split(/(?=[A-Z][^A-Z])/g); }) | |
| .enter().append("tspan") | |
| .attr("x", 0) | |
| .attr("y", function(d, i, nodes) { return 13 + (i - nodes.length / 2 - 0.5) * 10; }) | |
| .text(function(d) { return d; }); | |
| node.append("title") | |
| .text(function(d) { return d.id + "\n" + format(d.value); }); | |
| }); | |
| </script> | 
Thank you for your work!
In line 27, Why we have an assignment here if (id = d.data.id) { ? Shouldn't it be a comparison == ?
(https://gist.github.com/mbostock/4063269#file-index-html-L27)
  
    Sign up for free
    to join this conversation on GitHub.
    Already have an account?
    Sign in to comment
  
            
@mbostock FYI:
If my
d.classis number320or string"320"this example fails in place:I would suggest such change:
Note 1: Maybe in other places of example, such issues might be also. Did not yet spotted.
Note 2: That fix I suggest is not ideal, because if
d.classisundefinedornull, thenisNaN()will give true.Ideally it should be like in underscore
!_.isEmpty(d.class).