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1 <!DOCTYPE html> |
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2 <html> |
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3 <head> |
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4 <meta http-equiv="Content-Type" content="text/html;charset=utf-8"> |
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5 <title>Convex Hull</title> |
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6 <script type="text/javascript" src="../../d3.js"></script> |
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7 <script type="text/javascript" src="../../d3.geom.js"></script> |
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8 <style type="text/css"> |
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9 |
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10 svg { |
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11 border: solid 1px #aaa; |
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12 background: #eee; |
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13 } |
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14 |
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15 path { |
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16 fill: lightsteelblue; |
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17 stroke: #000; |
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18 } |
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19 |
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20 circle { |
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21 fill: #fff; |
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22 stroke: #000; |
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23 } |
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24 |
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25 </style> |
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26 </head> |
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27 <body> |
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28 <script type="text/javascript"> |
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29 |
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30 var w = 960, |
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31 h = 500; |
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32 |
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33 var vertices = d3.range(15).map(function(d) { |
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34 return [ |
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35 w / 4 + Math.random() * w / 2, |
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36 h / 4 + Math.random() * h / 2 |
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37 ]; |
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38 }); |
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39 |
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40 var svg = d3.select("body") |
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41 .append("svg:svg") |
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42 .attr("width", w) |
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43 .attr("height", h) |
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44 .attr("pointer-events", "all") |
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45 .on("mousemove", move) |
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46 .on("click", click); |
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47 |
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48 update(); |
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49 |
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50 function update() { |
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51 svg.selectAll("path") |
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52 .data([d3.geom.hull(vertices)]) |
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53 .attr("d", function(d) { return "M" + d.join("L") + "Z"; }) |
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54 .enter().append("svg:path") |
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55 .attr("d", function(d) { return "M" + d.join("L") + "Z"; }); |
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56 |
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57 svg.selectAll("circle") |
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58 .data(vertices.slice(1)) |
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59 .enter().append("svg:circle") |
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60 .attr("transform", function(d) { return "translate(" + d + ")"; }) |
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61 .attr("r", 3); |
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62 } |
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63 |
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64 function move() { |
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65 vertices[0] = d3.svg.mouse(this); |
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66 update(); |
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67 } |
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68 |
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69 function click() { |
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70 vertices.push(d3.svg.mouse(this)); |
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71 update(); |
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72 } |
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73 </script> |
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74 </body> |
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75 </html> |