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///////////////////////////////////////////////////////// |
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/////////////// The Radar Chart Function //////////////// |
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/////////////// Written by Nadieh Bremer //////////////// |
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////////////////// VisualCinnamon.com /////////////////// |
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/////////// Inspired by the code of alangrafu /////////// |
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///////////////////////////////////////////////////////// |
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function RadarChart(id, data, options) { |
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var cfg = { |
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w: 600, //Width of the circle |
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h: 600, //Height of the circle |
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margin: {top: 20, right: 20, bottom: 20, left: 20}, //The margins of the SVG |
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levels: 3, //How many levels or inner circles should there be drawn |
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maxValue: 0, //What is the value that the biggest circle will represent |
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labelFactor: 1.25, //How much farther than the radius of the outer circle should the labels be placed |
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wrapWidth: 60, //The number of pixels after which a label needs to be given a new line |
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opacityArea: 0.35, //The opacity of the area of the blob |
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dotRadius: 4, //The size of the colored circles of each blog |
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opacityCircles: 0.1, //The opacity of the circles of each blob |
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strokeWidth: 2, //The width of the stroke around each blob |
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roundStrokes: false, //If true the area and stroke will follow a round path (cardinal-closed) |
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color: d3.scale.category10() //Color function |
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}; |
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//Put all of the options into a variable called cfg |
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if('undefined' !== typeof options){ |
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for(var i in options){ |
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if('undefined' !== typeof options[i]){ cfg[i] = options[i]; } |
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}//for i |
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}//if |
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//If the supplied maxValue is smaller than the actual one, replace by the max in the data |
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var maxValue = Math.max(cfg.maxValue, d3.max(data, function(i){return d3.max(i.map(function(o){return o.value;}))})); |
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var allAxis = (data[0].map(function(i, j){return i.axis})), //Names of each axis |
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total = allAxis.length, //The number of different axes |
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radius = Math.min(cfg.w/2, cfg.h/2), //Radius of the outermost circle |
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Format = d3.format('%'), //Percentage formatting |
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angleSlice = Math.PI * 2 / total; //The width in radians of each "slice" |
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//Scale for the radius |
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var rScale = d3.scale.linear() |
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.range([0, radius]) |
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.domain([0, maxValue]); |
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///////////////////////////////////////////////////////// |
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//////////// Create the container SVG and g ///////////// |
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///////////////////////////////////////////////////////// |
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//Remove whatever chart with the same id/class was present before |
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d3.select(id).select("svg").remove(); |
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//Initiate the radar chart SVG |
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var svg = d3.select(id).append("svg") |
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.attr("width", cfg.w + cfg.margin.left + cfg.margin.right) |
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.attr("height", cfg.h + cfg.margin.top + cfg.margin.bottom) |
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.attr("class", "radar"+id); |
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//Append a g element |
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var g = svg.append("g") |
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.attr("transform", "translate(" + (cfg.w/2 + cfg.margin.left) + "," + (cfg.h/2 + cfg.margin.top) + ")"); |
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///////////////////////////////////////////////////////// |
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////////// Glow filter for some extra pizzazz /////////// |
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///////////////////////////////////////////////////////// |
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//Filter for the outside glow |
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var filter = g.append('defs').append('filter').attr('id','glow'), |
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feGaussianBlur = filter.append('feGaussianBlur').attr('stdDeviation','2.5').attr('result','coloredBlur'), |
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feMerge = filter.append('feMerge'), |
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feMergeNode_1 = feMerge.append('feMergeNode').attr('in','coloredBlur'), |
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feMergeNode_2 = feMerge.append('feMergeNode').attr('in','SourceGraphic'); |
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///////////////////////////////////////////////////////// |
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/////////////// Draw the Circular grid ////////////////// |
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///////////////////////////////////////////////////////// |
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//Wrapper for the grid & axes |
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var axisGrid = g.append("g").attr("class", "axisWrapper"); |
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//Draw the background circles |
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axisGrid.selectAll(".levels") |
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.data(d3.range(1,(cfg.levels+1)).reverse()) |
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.enter() |
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.append("circle") |
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.attr("class", "gridCircle") |
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.attr("r", function(d, i){return radius/cfg.levels*d;}) |
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.style("fill", "#CDCDCD") |
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.style("stroke", "#CDCDCD") |
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.style("fill-opacity", cfg.opacityCircles) |
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.style("filter" , "url(#glow)"); |
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//Text indicating at what % each level is |
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axisGrid.selectAll(".axisLabel") |
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.data(d3.range(1,(cfg.levels+1)).reverse()) |
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.enter().append("text") |
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.attr("class", "axisLabel") |
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.attr("x", 4) |
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.attr("y", function(d){return -d*radius/cfg.levels;}) |
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.attr("dy", "0.4em") |
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.style("font-size", "10px") |
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.attr("fill", "#737373") |
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.text(function(d,i) { return Format(maxValue * d/cfg.levels); }); |
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///////////////////////////////////////////////////////// |
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//////////////////// Draw the axes ////////////////////// |
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///////////////////////////////////////////////////////// |
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//Create the straight lines radiating outward from the center |
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var axis = axisGrid.selectAll(".axis") |
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.data(allAxis) |
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.enter() |
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.append("g") |
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.attr("class", "axis"); |
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//Append the lines |
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axis.append("line") |
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.attr("x1", 0) |
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.attr("y1", 0) |
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.attr("x2", function(d, i){ return rScale(maxValue*1.1) * Math.cos(angleSlice*i - Math.PI/2); }) |
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.attr("y2", function(d, i){ return rScale(maxValue*1.1) * Math.sin(angleSlice*i - Math.PI/2); }) |
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.attr("class", "line") |
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.style("stroke", "white") |
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.style("stroke-width", "2px"); |
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//Append the labels at each axis |
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axis.append("text") |
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.attr("class", "legend") |
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.style("font-size", "11px") |
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.attr("text-anchor", "middle") |
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.attr("dy", "0.35em") |
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.attr("x", function(d, i){ return rScale(maxValue * cfg.labelFactor) * Math.cos(angleSlice*i - Math.PI/2); }) |
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.attr("y", function(d, i){ return rScale(maxValue * cfg.labelFactor) * Math.sin(angleSlice*i - Math.PI/2); }) |
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.text(function(d){return d}) |
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.call(wrap, cfg.wrapWidth); |
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///////////////////////////////////////////////////////// |
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///////////// Draw the radar chart blobs //////////////// |
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///////////////////////////////////////////////////////// |
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//The radial line function |
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var radarLine = d3.svg.line.radial() |
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.interpolate("linear-closed") |
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.radius(function(d) { return rScale(d.value); }) |
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.angle(function(d,i) { return i*angleSlice; }); |
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if(cfg.roundStrokes) { |
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radarLine.interpolate("cardinal-closed"); |
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} |
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//Create a wrapper for the blobs |
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var blobWrapper = g.selectAll(".radarWrapper") |
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.data(data) |
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.enter().append("g") |
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.attr("class", "radarWrapper"); |
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//Append the backgrounds |
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blobWrapper |
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.append("path") |
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.attr("class", "radarArea") |
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.attr("d", function(d,i) { return radarLine(d); }) |
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.style("fill", function(d,i) { return cfg.color(i); }) |
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.style("fill-opacity", cfg.opacityArea) |
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.on('mouseover', function (d,i){ |
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//Dim all blobs |
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d3.selectAll(".radarArea") |
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.transition().duration(200) |
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.style("fill-opacity", 0.1); |
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//Bring back the hovered over blob |
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d3.select(this) |
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.transition().duration(200) |
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.style("fill-opacity", 0.7); |
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}) |
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.on('mouseout', function(){ |
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//Bring back all blobs |
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d3.selectAll(".radarArea") |
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.transition().duration(200) |
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.style("fill-opacity", cfg.opacityArea); |
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}); |
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//Create the outlines |
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blobWrapper.append("path") |
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.attr("class", "radarStroke") |
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.attr("d", function(d,i) { return radarLine(d); }) |
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.style("stroke-width", cfg.strokeWidth + "px") |
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.style("stroke", function(d,i) { return cfg.color(i); }) |
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.style("fill", "none") |
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.style("filter" , "url(#glow)"); |
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//Append the circles |
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blobWrapper.selectAll(".radarCircle") |
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.data(function(d,i) { return d; }) |
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.enter().append("circle") |
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.attr("class", "radarCircle") |
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.attr("r", cfg.dotRadius) |
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.attr("cx", function(d,i){ return rScale(d.value) * Math.cos(angleSlice*i - Math.PI/2); }) |
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.attr("cy", function(d,i){ return rScale(d.value) * Math.sin(angleSlice*i - Math.PI/2); }) |
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.style("fill", function(d,i,j) { return cfg.color(j); }) |
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.style("fill-opacity", 0.8); |
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///////////////////////////////////////////////////////// |
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//////// Append invisible circles for tooltip /////////// |
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///////////////////////////////////////////////////////// |
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//Wrapper for the invisible circles on top |
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var blobCircleWrapper = g.selectAll(".radarCircleWrapper") |
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.data(data) |
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.enter().append("g") |
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.attr("class", "radarCircleWrapper"); |
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//Append a set of invisible circles on top for the mouseover pop-up |
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blobCircleWrapper.selectAll(".radarInvisibleCircle") |
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.data(function(d,i) { return d; }) |
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.enter().append("circle") |
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.attr("class", "radarInvisibleCircle") |
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.attr("r", cfg.dotRadius*1.5) |
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.attr("cx", function(d,i){ return rScale(d.value) * Math.cos(angleSlice*i - Math.PI/2); }) |
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.attr("cy", function(d,i){ return rScale(d.value) * Math.sin(angleSlice*i - Math.PI/2); }) |
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.style("fill", "none") |
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.style("pointer-events", "all") |
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.on("mouseover", function(d,i) { |
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newX = parseFloat(d3.select(this).attr('cx')) - 10; |
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newY = parseFloat(d3.select(this).attr('cy')) - 10; |
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tooltip |
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.attr('x', newX) |
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.attr('y', newY) |
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.text(Format(d.value)) |
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.transition().duration(200) |
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.style('opacity', 1); |
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}) |
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.on("mouseout", function(){ |
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tooltip.transition().duration(200) |
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.style("opacity", 0); |
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}); |
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//Set up the small tooltip for when you hover over a circle |
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var tooltip = g.append("text") |
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.attr("class", "tooltip") |
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.style("opacity", 0); |
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///////////////////////////////////////////////////////// |
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/////////////////// Helper Function ///////////////////// |
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///////////////////////////////////////////////////////// |
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//Taken from http://bl.ocks.org/mbostock/7555321 |
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//Wraps SVG text |
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function wrap(text, width) { |
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text.each(function() { |
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var text = d3.select(this), |
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words = text.text().split(/\s+/).reverse(), |
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word, |
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line = [], |
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lineNumber = 0, |
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lineHeight = 1.4, // ems |
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y = text.attr("y"), |
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x = text.attr("x"), |
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dy = parseFloat(text.attr("dy")), |
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tspan = text.text(null).append("tspan").attr("x", x).attr("y", y).attr("dy", dy + "em"); |
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while (word = words.pop()) { |
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line.push(word); |
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tspan.text(line.join(" ")); |
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if (tspan.node().getComputedTextLength() > width) { |
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line.pop(); |
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tspan.text(line.join(" ")); |
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line = [word]; |
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tspan = text.append("tspan").attr("x", x).attr("y", y).attr("dy", ++lineNumber * lineHeight + dy + "em").text(word); |
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} |
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} |
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}); |
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}//wrap |
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}//RadarChart |
