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353 lines
12 KiB
353 lines
12 KiB
/* Flot plugin for plotting error bars. |
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Copyright (c) 2007-2014 IOLA and Ole Laursen. |
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Licensed under the MIT license. |
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Error bars are used to show standard deviation and other statistical |
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properties in a plot. |
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* Created by Rui Pereira - rui (dot) pereira (at) gmail (dot) com |
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This plugin allows you to plot error-bars over points. Set "errorbars" inside |
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the points series to the axis name over which there will be error values in |
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your data array (*even* if you do not intend to plot them later, by setting |
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"show: null" on xerr/yerr). |
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The plugin supports these options: |
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series: { |
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points: { |
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errorbars: "x" or "y" or "xy", |
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xerr: { |
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show: null/false or true, |
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asymmetric: null/false or true, |
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upperCap: null or "-" or function, |
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lowerCap: null or "-" or function, |
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color: null or color, |
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radius: null or number |
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}, |
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yerr: { same options as xerr } |
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} |
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} |
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Each data point array is expected to be of the type: |
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"x" [ x, y, xerr ] |
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"y" [ x, y, yerr ] |
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"xy" [ x, y, xerr, yerr ] |
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Where xerr becomes xerr_lower,xerr_upper for the asymmetric error case, and |
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equivalently for yerr. Eg., a datapoint for the "xy" case with symmetric |
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error-bars on X and asymmetric on Y would be: |
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[ x, y, xerr, yerr_lower, yerr_upper ] |
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By default no end caps are drawn. Setting upperCap and/or lowerCap to "-" will |
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draw a small cap perpendicular to the error bar. They can also be set to a |
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user-defined drawing function, with (ctx, x, y, radius) as parameters, as eg. |
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function drawSemiCircle( ctx, x, y, radius ) { |
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ctx.beginPath(); |
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ctx.arc( x, y, radius, 0, Math.PI, false ); |
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ctx.moveTo( x - radius, y ); |
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ctx.lineTo( x + radius, y ); |
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ctx.stroke(); |
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} |
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Color and radius both default to the same ones of the points series if not |
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set. The independent radius parameter on xerr/yerr is useful for the case when |
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we may want to add error-bars to a line, without showing the interconnecting |
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points (with radius: 0), and still showing end caps on the error-bars. |
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shadowSize and lineWidth are derived as well from the points series. |
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*/ |
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(function ($) { |
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var options = { |
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series: { |
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points: { |
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errorbars: null, //should be 'x', 'y' or 'xy' |
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xerr: { err: 'x', show: null, asymmetric: null, upperCap: null, lowerCap: null, color: null, radius: null}, |
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yerr: { err: 'y', show: null, asymmetric: null, upperCap: null, lowerCap: null, color: null, radius: null} |
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} |
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} |
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}; |
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function processRawData(plot, series, data, datapoints){ |
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if (!series.points.errorbars) |
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return; |
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// x,y values |
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var format = [ |
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{ x: true, number: true, required: true }, |
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{ y: true, number: true, required: true } |
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]; |
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var errors = series.points.errorbars; |
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// error bars - first X then Y |
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if (errors == 'x' || errors == 'xy') { |
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// lower / upper error |
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if (series.points.xerr.asymmetric) { |
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format.push({ x: true, number: true, required: true }); |
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format.push({ x: true, number: true, required: true }); |
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} else |
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format.push({ x: true, number: true, required: true }); |
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} |
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if (errors == 'y' || errors == 'xy') { |
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// lower / upper error |
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if (series.points.yerr.asymmetric) { |
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format.push({ y: true, number: true, required: true }); |
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format.push({ y: true, number: true, required: true }); |
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} else |
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format.push({ y: true, number: true, required: true }); |
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} |
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datapoints.format = format; |
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} |
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function parseErrors(series, i){ |
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var points = series.datapoints.points; |
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// read errors from points array |
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var exl = null, |
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exu = null, |
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eyl = null, |
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eyu = null; |
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var xerr = series.points.xerr, |
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yerr = series.points.yerr; |
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var eb = series.points.errorbars; |
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// error bars - first X |
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if (eb == 'x' || eb == 'xy') { |
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if (xerr.asymmetric) { |
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exl = points[i + 2]; |
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exu = points[i + 3]; |
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if (eb == 'xy') |
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if (yerr.asymmetric){ |
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eyl = points[i + 4]; |
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eyu = points[i + 5]; |
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} else eyl = points[i + 4]; |
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} else { |
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exl = points[i + 2]; |
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if (eb == 'xy') |
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if (yerr.asymmetric) { |
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eyl = points[i + 3]; |
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eyu = points[i + 4]; |
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} else eyl = points[i + 3]; |
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} |
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// only Y |
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} else if (eb == 'y') |
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if (yerr.asymmetric) { |
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eyl = points[i + 2]; |
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eyu = points[i + 3]; |
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} else eyl = points[i + 2]; |
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// symmetric errors? |
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if (exu == null) exu = exl; |
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if (eyu == null) eyu = eyl; |
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var errRanges = [exl, exu, eyl, eyu]; |
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// nullify if not showing |
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if (!xerr.show){ |
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errRanges[0] = null; |
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errRanges[1] = null; |
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} |
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if (!yerr.show){ |
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errRanges[2] = null; |
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errRanges[3] = null; |
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} |
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return errRanges; |
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} |
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function drawSeriesErrors(plot, ctx, s){ |
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var points = s.datapoints.points, |
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ps = s.datapoints.pointsize, |
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ax = [s.xaxis, s.yaxis], |
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radius = s.points.radius, |
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err = [s.points.xerr, s.points.yerr]; |
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//sanity check, in case some inverted axis hack is applied to flot |
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var invertX = false; |
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if (ax[0].p2c(ax[0].max) < ax[0].p2c(ax[0].min)) { |
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invertX = true; |
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var tmp = err[0].lowerCap; |
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err[0].lowerCap = err[0].upperCap; |
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err[0].upperCap = tmp; |
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} |
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var invertY = false; |
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if (ax[1].p2c(ax[1].min) < ax[1].p2c(ax[1].max)) { |
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invertY = true; |
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var tmp = err[1].lowerCap; |
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err[1].lowerCap = err[1].upperCap; |
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err[1].upperCap = tmp; |
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} |
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for (var i = 0; i < s.datapoints.points.length; i += ps) { |
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//parse |
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var errRanges = parseErrors(s, i); |
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//cycle xerr & yerr |
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for (var e = 0; e < err.length; e++){ |
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var minmax = [ax[e].min, ax[e].max]; |
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//draw this error? |
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if (errRanges[e * err.length]){ |
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//data coordinates |
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var x = points[i], |
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y = points[i + 1]; |
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//errorbar ranges |
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var upper = [x, y][e] + errRanges[e * err.length + 1], |
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lower = [x, y][e] - errRanges[e * err.length]; |
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//points outside of the canvas |
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if (err[e].err == 'x') |
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if (y > ax[1].max || y < ax[1].min || upper < ax[0].min || lower > ax[0].max) |
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continue; |
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if (err[e].err == 'y') |
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if (x > ax[0].max || x < ax[0].min || upper < ax[1].min || lower > ax[1].max) |
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continue; |
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// prevent errorbars getting out of the canvas |
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var drawUpper = true, |
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drawLower = true; |
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if (upper > minmax[1]) { |
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drawUpper = false; |
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upper = minmax[1]; |
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} |
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if (lower < minmax[0]) { |
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drawLower = false; |
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lower = minmax[0]; |
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} |
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//sanity check, in case some inverted axis hack is applied to flot |
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if ((err[e].err == 'x' && invertX) || (err[e].err == 'y' && invertY)) { |
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//swap coordinates |
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var tmp = lower; |
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lower = upper; |
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upper = tmp; |
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tmp = drawLower; |
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drawLower = drawUpper; |
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drawUpper = tmp; |
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tmp = minmax[0]; |
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minmax[0] = minmax[1]; |
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minmax[1] = tmp; |
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} |
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// convert to pixels |
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x = ax[0].p2c(x), |
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y = ax[1].p2c(y), |
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upper = ax[e].p2c(upper); |
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lower = ax[e].p2c(lower); |
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minmax[0] = ax[e].p2c(minmax[0]); |
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minmax[1] = ax[e].p2c(minmax[1]); |
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//same style as points by default |
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var lw = err[e].lineWidth ? err[e].lineWidth : s.points.lineWidth, |
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sw = s.points.shadowSize != null ? s.points.shadowSize : s.shadowSize; |
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//shadow as for points |
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if (lw > 0 && sw > 0) { |
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var w = sw / 2; |
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ctx.lineWidth = w; |
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ctx.strokeStyle = "rgba(0,0,0,0.1)"; |
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drawError(ctx, err[e], x, y, upper, lower, drawUpper, drawLower, radius, w + w/2, minmax); |
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ctx.strokeStyle = "rgba(0,0,0,0.2)"; |
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drawError(ctx, err[e], x, y, upper, lower, drawUpper, drawLower, radius, w/2, minmax); |
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} |
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ctx.strokeStyle = err[e].color? err[e].color: s.color; |
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ctx.lineWidth = lw; |
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//draw it |
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drawError(ctx, err[e], x, y, upper, lower, drawUpper, drawLower, radius, 0, minmax); |
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} |
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} |
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} |
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} |
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function drawError(ctx,err,x,y,upper,lower,drawUpper,drawLower,radius,offset,minmax){ |
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//shadow offset |
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y += offset; |
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upper += offset; |
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lower += offset; |
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// error bar - avoid plotting over circles |
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if (err.err == 'x'){ |
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if (upper > x + radius) drawPath(ctx, [[upper,y],[Math.max(x + radius,minmax[0]),y]]); |
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else drawUpper = false; |
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if (lower < x - radius) drawPath(ctx, [[Math.min(x - radius,minmax[1]),y],[lower,y]] ); |
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else drawLower = false; |
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} |
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else { |
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if (upper < y - radius) drawPath(ctx, [[x,upper],[x,Math.min(y - radius,minmax[0])]] ); |
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else drawUpper = false; |
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if (lower > y + radius) drawPath(ctx, [[x,Math.max(y + radius,minmax[1])],[x,lower]] ); |
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else drawLower = false; |
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} |
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//internal radius value in errorbar, allows to plot radius 0 points and still keep proper sized caps |
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//this is a way to get errorbars on lines without visible connecting dots |
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radius = err.radius != null? err.radius: radius; |
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// upper cap |
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if (drawUpper) { |
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if (err.upperCap == '-'){ |
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if (err.err=='x') drawPath(ctx, [[upper,y - radius],[upper,y + radius]] ); |
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else drawPath(ctx, [[x - radius,upper],[x + radius,upper]] ); |
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} else if ($.isFunction(err.upperCap)){ |
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if (err.err=='x') err.upperCap(ctx, upper, y, radius); |
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else err.upperCap(ctx, x, upper, radius); |
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} |
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} |
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// lower cap |
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if (drawLower) { |
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if (err.lowerCap == '-'){ |
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if (err.err=='x') drawPath(ctx, [[lower,y - radius],[lower,y + radius]] ); |
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else drawPath(ctx, [[x - radius,lower],[x + radius,lower]] ); |
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} else if ($.isFunction(err.lowerCap)){ |
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if (err.err=='x') err.lowerCap(ctx, lower, y, radius); |
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else err.lowerCap(ctx, x, lower, radius); |
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} |
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} |
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} |
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function drawPath(ctx, pts){ |
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ctx.beginPath(); |
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ctx.moveTo(pts[0][0], pts[0][1]); |
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for (var p=1; p < pts.length; p++) |
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ctx.lineTo(pts[p][0], pts[p][1]); |
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ctx.stroke(); |
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} |
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function draw(plot, ctx){ |
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var plotOffset = plot.getPlotOffset(); |
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ctx.save(); |
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ctx.translate(plotOffset.left, plotOffset.top); |
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$.each(plot.getData(), function (i, s) { |
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if (s.points.errorbars && (s.points.xerr.show || s.points.yerr.show)) |
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drawSeriesErrors(plot, ctx, s); |
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}); |
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ctx.restore(); |
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} |
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function init(plot) { |
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plot.hooks.processRawData.push(processRawData); |
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plot.hooks.draw.push(draw); |
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} |
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$.plot.plugins.push({ |
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init: init, |
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options: options, |
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name: 'errorbars', |
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version: '1.0' |
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}); |
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})(jQuery);
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