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Diffstat (limited to 'tipboard/static/js/lib/jqplot/plugins/jqplot.trendline.js')
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diff --git a/tipboard/static/js/lib/jqplot/plugins/jqplot.trendline.js b/tipboard/static/js/lib/jqplot/plugins/jqplot.trendline.js new file mode 100644 index 0000000..666498a --- /dev/null +++ b/tipboard/static/js/lib/jqplot/plugins/jqplot.trendline.js @@ -0,0 +1,223 @@ +/** + * jqPlot + * Pure JavaScript plotting plugin using jQuery + * + * Version: 1.0.8 + * Revision: 1250 + * + * Copyright (c) 2009-2013 Chris Leonello + * jqPlot is currently available for use in all personal or commercial projects + * under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL + * version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can + * choose the license that best suits your project and use it accordingly. + * + * Although not required, the author would appreciate an email letting him + * know of any substantial use of jqPlot. You can reach the author at: + * chris at jqplot dot com or see http://www.jqplot.com/info.php . + * + * If you are feeling kind and generous, consider supporting the project by + * making a donation at: http://www.jqplot.com/donate.php . + * + * sprintf functions contained in jqplot.sprintf.js by Ash Searle: + * + * version 2007.04.27 + * author Ash Searle + * http://hexmen.com/blog/2007/03/printf-sprintf/ + * http://hexmen.com/js/sprintf.js + * The author (Ash Searle) has placed this code in the public domain: + * "This code is unrestricted: you are free to use it however you like." + * + */ +(function($) { + + /** + * Class: $.jqplot.Trendline + * Plugin which will automatically compute and draw trendlines for plotted data. + */ + $.jqplot.Trendline = function() { + // Group: Properties + + // prop: show + // Wether or not to show the trend line. + this.show = $.jqplot.config.enablePlugins; + // prop: color + // CSS color spec for the trend line. + // By default this wil be the same color as the primary line. + this.color = '#666666'; + // prop: renderer + // Renderer to use to draw the trend line. + // The data series that is plotted may not be rendered as a line. + // Therefore, we use our own line renderer here to draw a trend line. + this.renderer = new $.jqplot.LineRenderer(); + // prop: rendererOptions + // Options to pass to the line renderer. + // By default, markers are not shown on trend lines. + this.rendererOptions = {marker:{show:false}}; + // prop: label + // Label for the trend line to use in the legend. + this.label = ''; + // prop: type + // Either 'exponential', 'exp', or 'linear'. + this.type = 'linear'; + // prop: shadow + // true or false, whether or not to show the shadow. + this.shadow = true; + // prop: markerRenderer + // Renderer to use to draw markers on the line. + // I think this is wrong. + this.markerRenderer = {show:false}; + // prop: lineWidth + // Width of the trend line. + this.lineWidth = 1.5; + // prop: shadowAngle + // Angle of the shadow on the trend line. + this.shadowAngle = 45; + // prop: shadowOffset + // pixel offset for each stroke of the shadow. + this.shadowOffset = 1.0; + // prop: shadowAlpha + // Alpha transparency of the shadow. + this.shadowAlpha = 0.07; + // prop: shadowDepth + // number of strokes to make of the shadow. + this.shadowDepth = 3; + this.isTrendline = true; + + }; + + $.jqplot.postSeriesInitHooks.push(parseTrendLineOptions); + $.jqplot.postDrawSeriesHooks.push(drawTrendline); + $.jqplot.addLegendRowHooks.push(addTrendlineLegend); + + // called witin scope of the legend object + // current series passed in + // must return null or an object {label:label, color:color} + function addTrendlineLegend(series) { + var ret = null; + if (series.trendline && series.trendline.show) { + var lt = series.trendline.label.toString(); + if (lt) { + ret = {label:lt, color:series.trendline.color}; + } + } + return ret; + } + + // called within scope of a series + function parseTrendLineOptions (target, data, seriesDefaults, options, plot) { + if (this._type && (this._type === 'line' || this._type == 'bar')) { + this.trendline = new $.jqplot.Trendline(); + options = options || {}; + $.extend(true, this.trendline, {color:this.color}, seriesDefaults.trendline, options.trendline); + this.trendline.renderer.init.call(this.trendline, null); + } + } + + // called within scope of series object + function drawTrendline(sctx, options) { + // if we have options, merge trendline options in with precedence + options = $.extend(true, {}, this.trendline, options); + + if (this.trendline && options.show) { + var fit; + // this.renderer.setGridData.call(this); + var data = options.data || this.data; + fit = fitData(data, this.trendline.type); + var gridData = options.gridData || this.renderer.makeGridData.call(this, fit.data); + this.trendline.renderer.draw.call(this.trendline, sctx, gridData, {showLine:true, shadow:this.trendline.shadow}); + } + } + + function regression(x, y, typ) { + var type = (typ == null) ? 'linear' : typ; + var N = x.length; + var slope; + var intercept; + var SX = 0; + var SY = 0; + var SXX = 0; + var SXY = 0; + var SYY = 0; + var Y = []; + var X = []; + + if (type == 'linear') { + X = x; + Y = y; + } + else if (type == 'exp' || type == 'exponential') { + for ( var i=0; i<y.length; i++) { + // ignore points <= 0, log undefined. + if (y[i] <= 0) { + N--; + } + else { + X.push(x[i]); + Y.push(Math.log(y[i])); + } + } + } + + for ( var i = 0; i < N; i++) { + SX = SX + X[i]; + SY = SY + Y[i]; + SXY = SXY + X[i]* Y[i]; + SXX = SXX + X[i]* X[i]; + SYY = SYY + Y[i]* Y[i]; + } + + slope = (N*SXY - SX*SY)/(N*SXX - SX*SX); + intercept = (SY - slope*SX)/N; + + return [slope, intercept]; + } + + function linearRegression(X,Y) { + var ret; + ret = regression(X,Y,'linear'); + return [ret[0],ret[1]]; + } + + function expRegression(X,Y) { + var ret; + var x = X; + var y = Y; + ret = regression(x, y,'exp'); + var base = Math.exp(ret[0]); + var coeff = Math.exp(ret[1]); + return [base, coeff]; + } + + function fitData(data, typ) { + var type = (typ == null) ? 'linear' : typ; + var ret; + var res; + var x = []; + var y = []; + var ypred = []; + + for (i=0; i<data.length; i++){ + if (data[i] != null && data[i][0] != null && data[i][1] != null) { + x.push(data[i][0]); + y.push(data[i][1]); + } + } + + if (type == 'linear') { + ret = linearRegression(x,y); + for ( var i=0; i<x.length; i++){ + res = ret[0]*x[i] + ret[1]; + ypred.push([x[i], res]); + } + } + else if (type == 'exp' || type == 'exponential') { + ret = expRegression(x,y); + for ( var i=0; i<x.length; i++){ + res = ret[1]*Math.pow(ret[0],x[i]); + ypred.push([x[i], res]); + } + } + return {data: ypred, slope: ret[0], intercept: ret[1]}; + } + +})(jQuery);
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