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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>Contour</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 svg { |
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10 border: solid 1px #aaa; |
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11 } |
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12 path { |
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13 stroke: red; |
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14 stroke-width: 2px; |
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15 fill: none; |
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16 } |
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17 rect { |
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18 fill: lightsteelblue; |
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19 stroke: #eee; |
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20 stroke-width: 2px; |
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21 } |
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22 rect.d1 { |
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23 fill: steelblue; |
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24 } |
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25 rect.d2 { |
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26 fill: darkblue; |
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27 } |
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28 </style> |
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29 </head> |
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30 <body> |
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31 <script type="text/javascript"> |
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32 |
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33 function grid0(x,y) { |
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34 if (x < 0 || y < 0 || x >= dw || y >= dh) return 0; |
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35 return data[y][x]; |
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36 } |
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37 function grid1(x,y) { |
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38 if (x < 0 || y < 0 || x >= dw || y >= dh) return 0; |
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39 return data[y][x]==1; |
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40 } |
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41 function grid2(x,y) { |
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42 if (x < 0 || y < 0 || x >= dw || y >= dh) return 0; |
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43 return data[y][x]==2; |
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44 } |
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45 |
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46 var data = [[0, 0, 0, 0, 0, 0, 0, 0, 0, 0], |
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47 [0, 0, 0, 2, 2, 2, 0, 0, 0, 0], |
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48 [0, 0, 0, 2, 2, 2, 2, 0, 0, 0], |
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49 [0, 0, 2, 2, 2, 2, 2, 2, 0, 0], |
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50 [0, 0, 2, 2, 2, 2, 2, 2, 2, 0], |
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51 [0, 0, 2, 1, 0, 0, 2, 2, 2, 0], |
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52 [0, 0, 1, 1, 0, 0, 2, 2, 2, 0], |
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53 [0, 0, 0, 0, 1, 1, 2, 2, 0, 0], |
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54 [0, 0, 0, 0, 1, 2, 2, 2, 0, 0], |
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55 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]], |
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56 fn = [grid0, grid1, grid2], |
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57 dw = data[0].length, |
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58 dh = data.length; |
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59 sz = 30, |
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60 grid = grid0; |
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61 |
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62 function translateY(d, i) { return "translate(0,"+(i*sz)+")"; } |
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63 function translateX(d, i) { return "translate("+(i*sz)+",0)"; } |
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64 function scale(p) { return [p[0]*sz, p[1]*sz]; } |
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65 |
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66 var svg = d3.select("body") |
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67 .append("svg:svg") |
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68 .attr("width", dw*sz) |
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69 .attr("height", dh*sz); |
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70 |
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71 var g = svg.selectAll("g") |
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72 .data(data) |
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73 .enter().append("svg:g") |
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74 .attr("transform", translateY); |
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75 |
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76 g.selectAll("rect") |
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77 .data(function(d) { return d; }) |
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78 .enter().append("svg:rect") |
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79 .attr("transform", translateX) |
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80 .attr("width", sz) |
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81 .attr("height", sz) |
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82 .attr("class", function(d) { return "d"+d; }) |
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83 .on("mouseover", mouseover); |
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84 |
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85 contour(grid); |
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86 |
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87 function contour(grid, start) { |
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88 svg.selectAll("path") |
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89 .data([d3.geom.contour(grid, start).map(scale)]) |
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90 .attr("d", function(d) { return "M" + d.join("L") + "Z"; }) |
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91 .enter().append("svg:path") |
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92 .attr("d", function(d) { return "M" + d.join("L") + "Z"; }); |
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93 } |
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94 |
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95 function mouseover(d,i) { |
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96 var s = undefined; |
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97 grid = fn[d]; |
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98 if (d > 0) { |
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99 // map mouse to grid coords, then find left edge |
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100 var p = d3.svg.mouse(svg[0][0]); |
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101 s = [Math.floor(p[0]/sz), Math.floor(p[1]/sz)]; |
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102 while (grid(s[0]-1,s[1])) s[0]--; |
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103 } |
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104 contour(grid, s); |
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105 } |
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106 </script> |
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107 </body> |
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108 </html> |