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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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svg { |
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font: 10px sans-serif; |
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} |
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.background path { |
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fill: none; |
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stroke: #ccc; |
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stroke-opacity: .4; |
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shape-rendering: crispEdges; |
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} |
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.foreground path { |
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fill: none; |
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stroke: steelblue; |
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stroke-opacity: .7; |
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} |
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.brush .extent { |
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fill-opacity: .3; |
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stroke: #fff; |
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shape-rendering: crispEdges; |
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} |
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.axis line, |
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.axis path { |
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fill: none; |
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stroke: #000; |
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shape-rendering: crispEdges; |
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} |
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.axis text { |
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text-shadow: 0 1px 0 #fff; |
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cursor: move; |
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} |
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</style> |
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<body> |
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<script src="//d3js.org/d3.v3.min.js"></script> |
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<script> |
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var m = [30, 10, 10, 10], |
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w = 960 - m[1] - m[3], |
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h = 500 - m[0] - m[2]; |
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var x = d3.scale.ordinal().rangePoints([0, w], 1), |
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y = {}, |
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dragging = {}; |
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var line = d3.svg.line(), |
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axis = d3.svg.axis().orient("left"), |
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background, |
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foreground; |
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var svg = d3.select("body").append("svg") |
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.attr("width", w + m[1] + m[3]) |
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.attr("height", h + m[0] + m[2]) |
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.append("g") |
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.attr("transform", "translate(" + m[3] + "," + m[0] + ")"); |
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d3.csv("cars.csv", function(error, cars) { |
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// Extract the list of dimensions and create a scale for each. |
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x.domain(dimensions = d3.keys(cars[0]).filter(function(d) { |
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return d != "name" && (y[d] = d3.scale.linear() |
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.domain(d3.extent(cars, function(p) { return +p[d]; })) |
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.range([h, 0])); |
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})); |
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// Add grey background lines for context. |
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background = svg.append("g") |
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.attr("class", "background") |
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.selectAll("path") |
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.data(cars) |
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.enter().append("path") |
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.attr("d", path); |
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// Add blue foreground lines for focus. |
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foreground = svg.append("g") |
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.attr("class", "foreground") |
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.selectAll("path") |
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.data(cars) |
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.enter().append("path") |
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.attr("d", path); |
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// Add a group element for each dimension. |
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var g = svg.selectAll(".dimension") |
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.data(dimensions) |
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.enter().append("g") |
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.attr("class", "dimension") |
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.attr("transform", function(d) { return "translate(" + x(d) + ")"; }) |
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.call(d3.behavior.drag() |
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.on("dragstart", function(d) { |
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dragging[d] = this.__origin__ = x(d); |
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background.attr("visibility", "hidden"); |
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}) |
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.on("drag", function(d) { |
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dragging[d] = Math.min(w, Math.max(0, this.__origin__ += d3.event.dx)); |
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foreground.attr("d", path); |
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dimensions.sort(function(a, b) { return position(a) - position(b); }); |
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x.domain(dimensions); |
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g.attr("transform", function(d) { return "translate(" + position(d) + ")"; }) |
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}) |
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.on("dragend", function(d) { |
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delete this.__origin__; |
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delete dragging[d]; |
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transition(d3.select(this)).attr("transform", "translate(" + x(d) + ")"); |
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transition(foreground) |
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.attr("d", path); |
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background |
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.attr("d", path) |
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.transition() |
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.delay(500) |
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.duration(0) |
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.attr("visibility", null); |
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})); |
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// Add an axis and title. |
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g.append("g") |
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.attr("class", "axis") |
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.each(function(d) { d3.select(this).call(axis.scale(y[d])); }) |
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.append("text") |
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.attr("text-anchor", "middle") |
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.attr("y", -9) |
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.text(String); |
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// Add and store a brush for each axis. |
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g.append("g") |
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.attr("class", "brush") |
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.each(function(d) { d3.select(this).call(y[d].brush = d3.svg.brush().y(y[d]).on("brushstart", brushstart).on("brush", brush)); }) |
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.selectAll("rect") |
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.attr("x", -8) |
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.attr("width", 16); |
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}); |
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function position(d) { |
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var v = dragging[d]; |
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return v == null ? x(d) : v; |
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} |
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function transition(g) { |
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return g.transition().duration(500); |
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} |
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// Returns the path for a given data point. |
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function path(d) { |
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return line(dimensions.map(function(p) { return [position(p), y[p](d[p])]; })); |
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} |
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// When brushing, don’t trigger axis dragging. |
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function brushstart() { |
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d3.event.sourceEvent.stopPropagation(); |
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} |
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// Handles a brush event, toggling the display of foreground lines. |
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function brush() { |
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var actives = dimensions.filter(function(p) { return !y[p].brush.empty(); }), |
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extents = actives.map(function(p) { return y[p].brush.extent(); }); |
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foreground.style("display", function(d) { |
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return actives.every(function(p, i) { |
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return extents[i][0] <= d[p] && d[p] <= extents[i][1]; |
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}) ? null : "none"; |
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}); |
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} |
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</script> |
