This example uses d3.geom.hull to compute the 2D convex hull of a set of points. An outer stroke is used to pad the hull. Click to add a new point.
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Convex Hull
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>Convex Hull</title> | |
| <style> | |
| rect { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| .hull { | |
| fill: steelblue; | |
| stroke: steelblue; | |
| stroke-width: 32px; | |
| stroke-linejoin: round; | |
| } | |
| circle { | |
| fill: white; | |
| stroke: black; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var randomX = d3.random.normal(width / 2, 60), | |
| randomY = d3.random.normal(height / 2, 60), | |
| vertices = d3.range(100).map(function() { return [randomX(), randomY()]; }); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mousemove", function() { vertices[0] = d3.mouse(this); redraw(); }) | |
| .on("click", function() { vertices.push(d3.mouse(this)); redraw(); }); | |
| svg.append("rect") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var hull = svg.append("path") | |
| .attr("class", "hull"); | |
| var circle = svg.selectAll("circle"); | |
| redraw(); | |
| function redraw() { | |
| hull.datum(d3.geom.hull(vertices)).attr("d", function(d) { return "M" + d.join("L") + "Z"; }); | |
| circle = circle.data(vertices); | |
| circle.enter().append("circle").attr("r", 3); | |
| circle.attr("transform", function(d) { return "translate(" + d + ")"; }); | |
| } | |
| </script> |
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