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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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body { |
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margin: 0; |
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overflow: hidden; |
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} |
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svg { |
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font: 10px sans-serif; |
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} |
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.caption { |
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font-weight: bold; |
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} |
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.key path { |
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display: none; |
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} |
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.key line { |
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stroke: #000; |
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shape-rendering: crispEdges; |
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} |
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</style> |
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<body> |
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<script src="http://d3js.org/d3.v3.min.js"></script> |
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<script src="http://d3js.org/colorbrewer.v1.min.js"></script> |
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<script> |
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var scale = 'Blues', |
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scaleMax = 9; |
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var width = 960, |
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height = 500, |
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formatPercent = d3.format(".0%"), |
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formatNumber = d3.format(".0f"); |
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var threshold = d3.scale.threshold() |
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.domain([.11, .22, .33, .50]) |
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.range(colorbrewer.Blues[5]); |
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// A position encoding for the key only. |
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var x = d3.scale.linear() |
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.domain([0, 1]) |
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.range([0, 240]); |
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var xAxis = d3.svg.axis() |
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.scale(x) |
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.orient("bottom") |
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.tickSize(13) |
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.tickValues(threshold.domain()) |
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.tickFormat(function(d, i) { return i === threshold.domain().length-1 ? formatPercent(d) : formatNumber(100 * d); }); |
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var others; |
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var drag = d3.behavior.drag() |
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.on('dragstart', function(d) { |
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others = []; |
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threshold.domain().forEach(function(v) { |
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if ( v == d ) return; |
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others.push(v); |
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}); |
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}) |
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.on('drag', function(d) { |
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var xMin = x.domain()[0], xMax = x.domain()[1]; |
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var newValue = x.invert( d3.event.x ); |
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newValue = |
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newValue < xMin ? xMin : |
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xMax < newValue ? xMax : |
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newValue; |
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var newDomain = others.slice(); |
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newDomain.push( newValue ); |
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newDomain.sort(); |
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threshold.domain( newDomain ); |
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xAxis.tickValues( newDomain ); |
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update(); |
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}); |
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var svg = d3.select("body").append("svg") |
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.attr("width", width) |
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.attr("height", height); |
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var g = svg.append("g") |
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.attr("class", "key") |
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.attr("transform", "translate(" + (width - 240) / 2 + "," + height / 2 + ")"); |
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var rects = g.append("g"); |
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function update() { |
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var rect = rects.selectAll(".range") |
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.data(threshold.range().map(function(color) { |
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var d = threshold.invertExtent(color); |
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if (d[0] == null) d[0] = x.domain()[0]; |
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if (d[1] == null) d[1] = x.domain()[1]; |
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return d; |
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})); |
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rect.enter().append("rect") |
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.attr("class", "range") |
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.attr("height", 8) |
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.on("dblclick", function() { |
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var newValue = x.invert( d3.mouse(this)[0] ); |
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var newDomain = threshold.domain().slice(); |
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newDomain.push( newValue ); |
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if ( newDomain.length >= scaleMax ) return; |
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newDomain.sort(); |
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threshold |
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.domain( newDomain ) |
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.range(colorbrewer[scale][newDomain.length+1]); |
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xAxis.tickValues( newDomain ); |
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update(); |
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}); |
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rect |
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.attr("x", function(d) { return x(d[0]); }) |
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.attr("width", function(d) { return x(d[1]) - x(d[0]); }) |
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.style("fill", function(d) { return threshold(d[0]); }); |
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g.call(xAxis) |
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.selectAll(".tick") |
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.style("cursor", "ew-resize") |
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.call(drag) |
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.append("rect") |
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.attr("x", -3) |
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.attr("width", 6) |
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.attr("height", 13) |
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.attr("fill-opacity", 0); |
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} |
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update(); |
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g.append("text") |
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.attr("class", "caption") |
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.attr("y", -6) |
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.text("Percentage of stops that involved force"); |
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</script> |
