| [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>Zoom</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.csv.js"></script> |
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| 8 | <script type="text/javascript" src="../../d3.time.js"></script> |
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| 9 | <style type="text/css"> |
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| 10 | |
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| 11 | path { |
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| 12 | fill: steelblue; |
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| 13 | } |
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| 14 | |
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| 15 | line { |
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| 16 | stroke: #000; |
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| 17 | shape-rendering: crispEdges; |
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| 18 | } |
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| 19 | |
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| 20 | </style> |
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| 21 | </head> |
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| 22 | <body> |
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| 23 | <script type="text/javascript"> |
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| 24 | |
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| 25 | var w = 960, |
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| 26 | h1 = 400, |
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| 27 | h2 = 40, |
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| 28 | p = 20, |
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| 29 | x0, // start of focus region |
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| 30 | x1, // end of focus region |
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| 31 | xx, // drag state |
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| 32 | time = d3.time.format("%Y-%m-%d"), |
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| 33 | x = d3.scale.linear().range([0, w]), |
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| 34 | y1 = d3.scale.linear().range([h1 - p, 0]), |
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| 35 | y2 = d3.scale.linear().range([h2, 0]); |
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| 36 | |
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| 37 | var svg = d3.select("body") |
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| 38 | .append("svg:svg") |
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| 39 | .attr("width", w) |
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| 40 | .attr("height", h1 + h2); |
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| 41 | |
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| 42 | // Focus view. |
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| 43 | var focus = svg.append("svg:g"); |
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| 44 | |
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| 45 | // Context view. |
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| 46 | var context = svg.append("svg:g") |
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| 47 | .attr("transform", "translate(0," + h1 + ")"); |
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| 48 | |
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| 49 | d3.csv("dji.csv", function(csv) { |
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| 50 | var minX, |
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| 51 | maxX, |
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| 52 | maxY = -Infinity; |
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| 53 | |
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| 54 | // Compute x- and y-extent. |
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| 55 | csv.reverse(); |
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| 56 | for (var i = 0, n = csv.length, o; i < n; i++) { |
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| 57 | o = csv[i]; |
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| 58 | o = csv[i] = {x: +time.parse(o.Date), y: +o.Close}; |
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| 59 | if (o.y > maxY) maxY = o.y; |
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| 60 | } |
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| 61 | minX = csv[0].x; |
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| 62 | maxX = csv[n - 1].x; |
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| 63 | |
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| 64 | // Update x- and y-scales. |
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| 65 | x.domain([minX, maxX]); |
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| 66 | y1.domain([0, maxY]); |
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| 67 | y2.domain([0, maxY]); |
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| 68 | |
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| 69 | // Focus view. |
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| 70 | focus.append("svg:path") |
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| 71 | .data([csv]) |
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| 72 | .attr("d", d3.svg.area() |
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| 73 | .x(function(d) { return x(d.x); }) |
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| 74 | .y0(y1(0)) |
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| 75 | .y1(function(d) { return y1(d.y); })); |
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| 76 | |
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| 77 | focus.append("svg:line") |
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| 78 | .attr("x1", 0) |
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| 79 | .attr("x2", w) |
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| 80 | .attr("y1", y1(0)) |
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| 81 | .attr("y2", y1(0)); |
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| 82 | |
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| 83 | // Context view. |
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| 84 | context.append("svg:rect") |
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| 85 | .attr("width", w) |
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| 86 | .attr("height", h2) |
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| 87 | .attr("fill", "none") |
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| 88 | .attr("pointer-events", "all") |
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| 89 | .attr("cursor", "crosshair") |
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| 90 | .on("mousedown", mousedown); |
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| 91 | |
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| 92 | context.append("svg:path") |
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| 93 | .data([csv]) |
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| 94 | .attr("pointer-events", "none") |
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| 95 | .attr("d", d3.svg.area() |
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| 96 | .x(function(d) { return x(d.x); }) |
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| 97 | .y0(y2(0)) |
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| 98 | .y1(function(d) { return y2(d.y); })); |
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| 99 | |
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| 100 | context.append("svg:line") |
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| 101 | .attr("x1", 0) |
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| 102 | .attr("x2", w) |
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| 103 | .attr("y1", y2(0)) |
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| 104 | .attr("y2", y2(0)); |
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| 105 | |
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| 106 | // Active focus region. |
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| 107 | active = context.append("svg:rect") |
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| 108 | .attr("pointer-events", "none") |
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| 109 | .attr("id", "active") |
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| 110 | .attr("x", x(x0 = minX)) |
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| 111 | .attr("y", 0) |
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| 112 | .attr("height", h2) |
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| 113 | .attr("width", x(x1 = (minX + 1e11)) - x(x0)) |
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| 114 | .attr("fill", "lightcoral") |
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| 115 | .attr("fill-opacity", .5); |
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| 116 | }); |
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| 117 | |
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| 118 | d3.select(window) |
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| 119 | .on("mousemove", mousemove) |
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| 120 | .on("mouseup", mouseup); |
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| 121 | |
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| 122 | function mousedown() { |
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| 123 | xx = x.invert(d3.svg.mouse(this)[0]); |
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| 124 | } |
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| 125 | |
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| 126 | function mousemove() { |
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| 127 | if (xx != null) { |
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| 128 | |
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| 129 | // Compute the new (clamped) focus region. |
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| 130 | var xy = x.invert(d3.svg.mouse(active[0][0])[0]); |
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| 131 | if (xx < xy) { x0 = xx; x1 = xy; } |
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| 132 | else if (xx > xy) { x0 = xy; x1 = xx; } |
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| 133 | else return; |
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| 134 | x0 = Math.max(x.domain()[0], x0); |
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| 135 | x1 = Math.min(x.domain()[1], x1); |
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| 136 | |
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| 137 | // Update the x-scale. TODO Recycle this scale? |
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| 138 | var tx = d3.scale.linear() |
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| 139 | .domain([x0, x1]) |
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| 140 | .range([0, w]); |
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| 141 | |
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| 142 | // Recompute the focus path. |
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| 143 | focus.select("path") |
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| 144 | .attr("d", d3.svg.area() |
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| 145 | .x(function(d) { return tx(d.x); }) |
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| 146 | .y0(y1(0)) |
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| 147 | .y1(function(d) { return y1(d.y); })); |
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| 148 | |
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| 149 | // Reposition the active region rect. |
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| 150 | active |
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| 151 | .attr("x", x(x0)) |
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| 152 | .attr("width", x(x1) - x(x0)); |
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| 153 | } |
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| 154 | } |
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| 155 | |
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| 156 | function mouseup() { |
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| 157 | xx = null; |
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| 158 | } |
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| 159 | |
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| 160 | </script> |
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| 161 | </body> |
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| 162 | </html> |
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