[76] | 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> |
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