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function Streamgraph($selector) { |
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/* Constants */ |
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var VMARGIN = 3, |
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YEARSHEIGHT = 20, |
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STARTTIME = new Date(2007,6,1), |
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ENDTIME = new Date(), |
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CURVE = .25, |
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DATEPADDING = 10, |
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COLORS = [ "#943a23", "#fbee97", "#cfbb95", "#da9761", "#ba5036" ], |
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SELECTEDCOLOR = "#c51810"; |
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/* Generating random data */ |
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var data = [], |
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clustercount = 12, |
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slicecount = 20, |
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maxdata = 10, |
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randpart = 4, |
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dampfactor = .333; |
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for (var i = 0; i < clustercount; i++) { |
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var line = [], |
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peaktime = Math.floor(Math.random() * slicecount); |
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for (var j = 0; j < slicecount; j++) { |
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var point = Math.min(maxdata, Math.max(0, (Math.random() - .5) * randpart + Math.max(0, maxdata * (1 - dampfactor * Math.abs(j - peaktime))))); |
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line.push(point); |
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} |
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data.push(line); |
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} |
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/* Calculating scales and positions */ |
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var width = $selector.width(), |
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height = $selector.height(), |
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transp = _.zip.apply( _, data ), |
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cumulative = _(transp).map(function(column) { |
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var total = 0; |
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return _(column).map(function(point) { |
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return total += point; |
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}); |
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}), |
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sums = _(cumulative).map(function(column) { |
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return _(column).last(); |
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}) |
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maxcol = _(sums).max(), |
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streamheight = height - YEARSHEIGHT, |
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yscale = (streamheight - 2 * VMARGIN) / maxcol, |
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centery = streamheight / 2, |
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xscale = width / (transp.length - 1), |
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txscale = width / (ENDTIME - STARTTIME), |
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coords = _(data).map(function(line, lineindex) { |
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return _(line).map(function(point, colindex) { |
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var lowercumul = lineindex ? cumulative[colindex][lineindex - 1] : 0, |
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uppercumul = cumulative[colindex][lineindex]; |
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return { |
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data: point, |
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x: xscale * colindex, |
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lowery: centery + yscale * ( ( sums[colindex] / 2 ) - lowercumul ), |
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uppery: centery + yscale * ( ( sums[colindex] / 2 ) - uppercumul ), |
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} |
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}); |
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}), |
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paths = _(coords).map(function(line) { |
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var lowerline = _(line).reduce(function(path, point, colindex) { |
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var res = path; |
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if (colindex) { |
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res += "," + (point.x - CURVE * xscale) + "," + point.lowery + "," + point.x + "," + point.lowery; |
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} else { |
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res += "M" + point.x + "," + point.lowery; |
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} |
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if (colindex < line.length - 1) { |
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res += "C" + (point.x + CURVE * xscale) + "," + point.lowery; |
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} |
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return res; |
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}, ""); |
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var upperline = _(line).reduceRight(function(path, point, colindex) { |
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var res = path; |
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if (colindex < line.length - 1) { |
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res += "," + (point.x + CURVE * xscale) + "," + point.uppery + "," + point.x + "," + point.uppery; |
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} else { |
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res += "L" + point.x + "," + point.uppery; |
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} |
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if (colindex) { |
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res += "C" + (point.x - CURVE * xscale) + "," + point.uppery; |
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} |
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return res; |
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}, ""); |
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return lowerline + upperline; |
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}); |
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/* Drawing streamgraph*/ |
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var paper = new Raphael($selector[0]); |
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_(paths).each(function(path, index) { |
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var color = COLORS[index % COLORS.length], |
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p = paper.path(path); |
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p.attr({ |
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stroke: "none", |
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fill: color |
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}); |
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}); |
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/* Drawing years */ |
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paper.path("M0," + (height - YEARSHEIGHT) + "," + width + "," + (height - YEARSHEIGHT)) |
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var lastyear = ENDTIME.getFullYear(); |
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for (var i = STARTTIME.getFullYear(); i <= lastyear; i++) { |
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var x = txscale * (new Date(i,0,1) - STARTTIME); |
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paper.path("M" + x + ",0," + x + "," + height); |
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var x = txscale * (new Date(i,6,1) - STARTTIME); |
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paper.text(x, height - .5 * YEARSHEIGHT, i) |
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.attr({ |
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"text-anchor": "middle", |
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"font-family": "Times New Roman, serif", |
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"font-size": "14px" |
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}); |
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} |
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/* Drawing range window */ |
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var carregauche = paper.rect(width,-1,width,(2+height)), |
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carredroite = paper.rect(-width,-1,width,(2+height)), |
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attrcarres = { |
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fill: "#333333", |
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"fill-opacity": .5, |
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stroke: SELECTEDCOLOR |
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}; |
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carregauche.attr(attrcarres); |
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carredroite.attr(attrcarres); |
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var rangerect = paper.rect(0, (height - YEARSHEIGHT), width, YEARSHEIGHT); |
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rangerect.attr({ |
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fill: SELECTEDCOLOR, |
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stroke: "none" |
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}); |
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function datetext(date) { |
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var d = new Date(date), |
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m = 1+d.getMonth(), |
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y = d.getFullYear(); |
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return ((m < 10 ? "0" : "") + m + "/" + y); |
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} |
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var startdate = paper.text(DATEPADDING, height - .5 * YEARSHEIGHT, datetext(STARTTIME)); |
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startdate.attr({ |
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fill: "#ffffff", |
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"text-anchor": "start" |
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}); |
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var enddate = paper.text(width - DATEPADDING, height - .5 * YEARSHEIGHT, datetext(ENDTIME)); |
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enddate.attr({ |
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fill: "#ffffff", |
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"text-anchor": "end" |
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}); |
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/* Redrawing time slices for rollover effect */ |
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_(paths).each(function(path, index) { |
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var p = paper.path(path); |
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p.attr({ |
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stroke: "none", |
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fill: SELECTEDCOLOR, |
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opacity: .01 |
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}).mouseover(function() { |
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p.attr({ |
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opacity: 1 |
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}); |
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}).mouseout(function() { |
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p.attr({ |
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opacity: .01 |
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}) |
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}); |
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}); |
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/* Returning a handler for slide value change */ |
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this.slidevalues = function(left, right) { |
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left = left || 0; |
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right = right || width; |
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carregauche.attr({x: left - width}); |
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carredroite.attr({x: right}); |
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startdate.attr({ |
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x: DATEPADDING + left, |
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text: datetext(STARTTIME.valueOf() + left / txscale) |
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}); |
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enddate.attr({ |
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x: right - DATEPADDING, |
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text: datetext(STARTTIME.valueOf() + right / txscale) |
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}); |
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rangerect.attr({ |
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x: left, |
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width: right - left |
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}); |
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} |
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} |
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$(function() { |
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window.streamgraph = new Streamgraph($(".streamgraph")); |
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streamgraph.slidevalues.apply(streamgraph,$("#slider-range").dragslider("values")); |
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}) |