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d3 v3 hull bug
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| <html> | |
| <head> | |
| <style type="text/css"> | |
| path { | |
| stroke: #000; | |
| stroke-width: .5px; | |
| fill: #39c; | |
| } | |
| circle { | |
| fill: #39c; | |
| } | |
| .hull { | |
| stroke: #E0E0E0; | |
| fill: #E0E0E0; | |
| stroke-width: 0; | |
| stroke-linejoin: round; | |
| transition-duration: 400ms; | |
| transition-property: opacity, stroke-width; | |
| opacity: 1; | |
| } | |
| </style> | |
| <script type="text/javascript" src="http://d3js.org/d3.v3.js"></script> | |
| </head> | |
| <body> | |
| <svg></svg> | |
| <script type="text/javascript"> | |
| const w = 800; | |
| const h = 600; | |
| const points = [[120, 120], [500, 200]]; | |
| const circleRadius = 100; | |
| const svg = d3.select("svg") | |
| .attr("width", w) | |
| .attr("height", h); | |
| const hullCanvas = svg.append("g"); | |
| const circles = svg.append("g"); | |
| const curve = d3.svg.line() | |
| .interpolate("basis-closed") | |
| .tension(1); | |
| function convertPointsForHull(points) { | |
| return points | |
| .map(function (point) { | |
| const slices = 36; | |
| const anglePerSlice = (Math.PI * 2) / slices; | |
| const hullPoints = []; | |
| let radius = circleRadius + 10; | |
| for (let slice = 0; slice < slices; slice++) { | |
| const angle = slice * anglePerSlice; | |
| const x = point[0] + (radius * Math.cos(angle)); | |
| const y = point[1] + (radius * Math.sin(angle)); | |
| hullPoints.push([x, y]); | |
| } | |
| return hullPoints; | |
| }) | |
| .reduce((list, points) => list.concat(points), []); | |
| } | |
| circles | |
| .selectAll("circle") | |
| .data(points) | |
| .enter() | |
| .append("circle") | |
| .attr("r", circleRadius) | |
| .attr("cx", function (d) { return d[0]; }) | |
| .attr("cy", function (d) { return d[1]; }); | |
| const hullPoints = convertPointsForHull(points); | |
| const hull = hullCanvas | |
| .append('path') | |
| .classed('hull', true); | |
| function setHull(points) { | |
| const allPoints = convertPointsForHull(points); | |
| hull | |
| .datum(d3.geom.hull(allPoints)) | |
| .transition() | |
| .duration(3000) | |
| .attr("d", curve); | |
| } | |
| setHull([points[0]]); | |
| setTimeout(() => { | |
| setHull(points); | |
| }, 1000); | |
| hullCanvas | |
| .selectAll("circle") | |
| .data(hullPoints) | |
| .enter() | |
| .append("circle") | |
| .attr("r", 1) | |
| .attr("cx", function (d) { return d[0]; }) | |
| .attr("cy", function (d) { return d[1]; }); | |
| </script> | |
| </body> | |
| </html> |
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